The Experts below are selected from a list of 5610 Experts worldwide ranked by ideXlab platform
Parinda Suksabye - One of the best experts on this subject based on the ideXlab platform.
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cr vi adsorption from electroplating plating wastewater by chemically modified Coir pith
Journal of Environmental Management, 2012Co-Authors: Parinda Suksabye, Paitip ThiravetyaAbstract:Coir pith samples were chemically modified by grafting with acrylic acid for the removal of Cr(VI) from electroplating wastewater. The presence of acrylic acid on the Coir pith surface was verified by a scanning electron microscope with an electron dispersive x-ray spectrometer (SEM/EDX), Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG). The carbonyl groups (CO) from the carboxylic acids (COOH) increased on the Coir pith surface after grafting with acrylic acid. In addition, the thermal stability of the acrylic acid-grafted Coir pith also improved. The optimum conditions for grafting the acrylic acid on the Coir pith consisted of 2 M acrylic acid and 0.00125 M ceric ammonium nitrate (CAN, as an initiator). The maximum Cr(VI) removal (99.99 ± 0.07%) was obtained with the following conditions: a 1.3% (w/v) dosage of acrylic acid-grafted Coir pith, a system pH of 2, a contact time of 22 h, a temperature of 30 °C, a particle size of <150 μm and an initial Cr(VI) of 1,171 mg l−1. At system pH of 2, Cr(VI) in the HCrO4− form can be adsorbed with acrylic acid-grafted Coir pith via an electrostatic attraction. The adsorption isotherm of 2 M acrylic acid-grafted Coir pith exhibited a good fit with the Langmuir isotherm. The maximum Cr(VI) adsorption capacity of the 2 M acrylic acid-grafted Coir pith was 196.00 mg Cr(VI) g−1 adsorbent, whereas for Coir pith without grafting, the maximum Cr(VI) removal was 165.00 mg Cr(VI) g−1 adsorbent. The adsorption capacity of the acrylic acid-grafted Coir pith for Cr(VI) was higher compared to the original Coir pith. This result was due to the enhancement of the carbonyl groups on the Coir pith surface that may have involved the mechanism of chromium adsorption. The X-ray absorption near edged structure (XANES) and desorption studies suggested that most of the Cr(III) that presented on the acrylic acid-grafted Coir pith was due to the Cr(VI) being reduced to Cr(III) on the adsorbent surface. FTIR confirmed the involvement of the carbonyl groups (CO) and the methoxy groups (OCH3) in the mechanism of chromium adsorption. Thermodynamic study, such as enthalpy (ΔH), free energy (ΔG) and entropy change (ΔS) indicated that the overall adsorption process was endothermic, spontaneous and randomness. In addition, the adsorption process was favored at high temperatures.
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mechanism of cr vi adsorption by Coir pith studied by esr and adsorption kinetic
Journal of Hazardous Materials, 2009Co-Authors: Parinda Suksabye, Akira Nakajima, Paitip Thiravetya, Yoshinari Aba, Worana NakbanpoteAbstract:The oxidation state of chromium in Coir pith after Cr(VI) adsorption from aqueous solution was investigated using electron spin resonance (ESR). To elucidate the mechanism of chromium adsorption on Coir pith, the adsorption studies of Cr(VI) onto lignin, alpha-cellulose and holocellulose extracted from Coir pith were also studied. ESR signals of Cr(V) and Cr(III) were observed in Coir pith adsorbed Cr(VI) at solution pH 2, while ESR spectra of lignin extracted from Coir pith revealed only the Cr(III) signal. In addition, ESR signal of Cr(V) was observed in alpha-cellulose and holocellulose extracted from Coir pith adsorbed Cr(VI). These results confirmed that lignin in Coir pith reduced Cr(VI) to Cr(III) while alpha-cellulose and holocellulose extracted from Coir pith reduced Cr(VI) to Cr(V). The Cr(V) signal exhibited in ESR of alpha-cellulose and holocellulose might be bound with glucose in cellulose part of Coir pith. In addition, xylose which is main in pentosan part of Coir pith, indicated that it is involved in form complex with Cr(V) on Coir pith. The adsorption kinetic of Cr(VI) from aqueous solution on Coir pith was also investigated and described well with pseudo second order model. ESR and desorption experiments confirmed that Cr(VI), Cr(V) and Cr(III), exist in Coir pith after Cr(VI) adsorption. The desorption data indicated that the percentage of Cr(VI), Cr(V) and Cr(III) in Coir pith were 15.63%, 12.89% and 71.48%, respectively.
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column study of chromium vi adsorption from electroplating industry by coconut Coir pith
Journal of Hazardous Materials, 2008Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana NakbanpoteAbstract:Abstract The removal of Cr(VI) from electroplating wastewater by Coir pith was investigated in a fixed-bed column. The experiments were conducted to study the effect of important parameters such as bed depth (40–60 cm) and flow rate (10–30 ml min −1 ). At 0.05 C t / C 0 , the breakthrough volume increased as flow rate decreased or a bed depth increased due to an increase in empty bed contact time (EBCT). The bed depth service time model (BDST) fit well with the experimental data in the initial region of the breakthrough curve, while the simulation of the whole curve using non-linear regression analysis was effective using the Thomas model. The adsorption capacity estimated from the BDST model was reduced with increasing flow rate, which was 16.40 mg cm −3 or 137.91 mg Cr(VI) g −1 Coir pith for the flow rates of 10 ml min −1 and 14.05 mg cm −3 or 118.20 mg Cr(VI) g −1 Coir pith for the flow rates of 30 ml min −1 . At the highest bed depth (60 cm) and the lowest flow rate (10 ml min −1 ), the maximum adsorption reached 201.47 mg Cr(VI) g −1 adsorbent according to the Thomas model. The column was regenerated by eluting chromium using 2 M HNO 3 after adsorption studies. The desorption of Cr(III) in each of three cycles was about 67–70%. The desorption of Cr(III) in each cycle did not reach 100% due to the fact that Cr(V) was present through the reduction of Cr(VI), and was still in Coir pith, possibly bound to glucose in the cellulose part of Coir pith. Therefore, the Cr(V) complex cannot be desorbed in solution. The evidence of Cr(V) signal was observed in Coir pith, α-cellulose and holocellulose extracted from Coir pith using electron spin resonance (ESR).
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chromium removal from electroplating wastewater by Coir pith
Journal of Hazardous Materials, 2007Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana Nakbanpote, Supanee ChayabutraAbstract:Coir pith is a by-product from padding used in mattress factories. It contains a high amount of lignin. Therefore, this study investigated the use of Coir pith in the removal of hexavalent chromium from electroplating wastewater by varying the parameters, such as the system pH, contact time, adsorbent dosage, and temperature. The maximum removal (99.99%) was obtained at 2% (w/v) dosage, particle size <75m, at initial Cr(VI) 1647 mg l −1 , system pH 2, and an equilibrium time of 18 h. The adsorption isotherm of Coir pith fitted reasonably well with the Langmuir model. The maximum Cr(VI) adsorption capacity of Coir pith at 15, 30, 45 and 60 ◦ C was 138.04, 197.23, 262.89 and 317.65 mg Cr(VI) g −1 Coir pith, respectively. Thermodynamic parameters indicated an endothermic process and the adsorption process was favored at high temperature. Desorption studies of Cr(VI) on Coir pith and X-ray absorption near edge structure (XANES) suggested that most of the chromium bound on the Coir pith was in Cr(III) form due to the fact that the toxic Cr(VI) adsorbed on the Coir pith by electrostatic attraction was easily reduced to less toxic Cr(III). Fourier transform infrared (FT-IR) spectrometry analysis indicated that the carbonyl (C O) groups and methoxy (O–CH3) groups from the lignin structure in Coir pith may be involved in the mechanism of chromium adsorption. The reduced Cr(III) on the Coir pith surface may be bound with C O groups and O–CH3 groups through coordinate covalent bonding in which a lone pair of electrons in the oxygen atoms of the methoxy and carbonyl groups can be donated to form a shared bond with Cr(III).
Paitip Thiravetya - One of the best experts on this subject based on the ideXlab platform.
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Modified Coir pith with glucose syrup as a supporter in non-external nutrient supplied biofilter for benzene removal by Bacillus megaterium
2019Co-Authors: Rujira Dolphe, Chaira Treesubsunto, Nuttapong Santawee, Arno Setsungnoe, Paitip ThiravetyaAbstract:Coir pith glucose syrup beads were used as a supporter in a biofilter system. The modified Coir pith beads provided a carbon source and controlled humidity for microorganism growth for long-term operation without external nutrient supplementation. For the screening, Bacillus spp. were immobilised on Coir pith beads and used for benzene bioremediation. The result showed that Coir pith beads immobilised with Bacillus megaterium can remove on average 85–100% of the benzene (215-day operation). In addition, B. megaterium presented the ability to transform benzene to catechol. For an up-scaled application, a 25-L biofilter system was developed and tested in a closed 24-m3 container re-injected with 0.6 ppm benzene for 8 cycles. The system presented the ability to remove 100% of the benzene. This biofilter has the potential to be applied in a real benzene-contaminated site.
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cr vi adsorption from electroplating plating wastewater by chemically modified Coir pith
Journal of Environmental Management, 2012Co-Authors: Parinda Suksabye, Paitip ThiravetyaAbstract:Coir pith samples were chemically modified by grafting with acrylic acid for the removal of Cr(VI) from electroplating wastewater. The presence of acrylic acid on the Coir pith surface was verified by a scanning electron microscope with an electron dispersive x-ray spectrometer (SEM/EDX), Fourier transform infrared spectroscopy (FTIR) and thermogravimetry (TG). The carbonyl groups (CO) from the carboxylic acids (COOH) increased on the Coir pith surface after grafting with acrylic acid. In addition, the thermal stability of the acrylic acid-grafted Coir pith also improved. The optimum conditions for grafting the acrylic acid on the Coir pith consisted of 2 M acrylic acid and 0.00125 M ceric ammonium nitrate (CAN, as an initiator). The maximum Cr(VI) removal (99.99 ± 0.07%) was obtained with the following conditions: a 1.3% (w/v) dosage of acrylic acid-grafted Coir pith, a system pH of 2, a contact time of 22 h, a temperature of 30 °C, a particle size of <150 μm and an initial Cr(VI) of 1,171 mg l−1. At system pH of 2, Cr(VI) in the HCrO4− form can be adsorbed with acrylic acid-grafted Coir pith via an electrostatic attraction. The adsorption isotherm of 2 M acrylic acid-grafted Coir pith exhibited a good fit with the Langmuir isotherm. The maximum Cr(VI) adsorption capacity of the 2 M acrylic acid-grafted Coir pith was 196.00 mg Cr(VI) g−1 adsorbent, whereas for Coir pith without grafting, the maximum Cr(VI) removal was 165.00 mg Cr(VI) g−1 adsorbent. The adsorption capacity of the acrylic acid-grafted Coir pith for Cr(VI) was higher compared to the original Coir pith. This result was due to the enhancement of the carbonyl groups on the Coir pith surface that may have involved the mechanism of chromium adsorption. The X-ray absorption near edged structure (XANES) and desorption studies suggested that most of the Cr(III) that presented on the acrylic acid-grafted Coir pith was due to the Cr(VI) being reduced to Cr(III) on the adsorbent surface. FTIR confirmed the involvement of the carbonyl groups (CO) and the methoxy groups (OCH3) in the mechanism of chromium adsorption. Thermodynamic study, such as enthalpy (ΔH), free energy (ΔG) and entropy change (ΔS) indicated that the overall adsorption process was endothermic, spontaneous and randomness. In addition, the adsorption process was favored at high temperatures.
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mechanism of cr vi adsorption by Coir pith studied by esr and adsorption kinetic
Journal of Hazardous Materials, 2009Co-Authors: Parinda Suksabye, Akira Nakajima, Paitip Thiravetya, Yoshinari Aba, Worana NakbanpoteAbstract:The oxidation state of chromium in Coir pith after Cr(VI) adsorption from aqueous solution was investigated using electron spin resonance (ESR). To elucidate the mechanism of chromium adsorption on Coir pith, the adsorption studies of Cr(VI) onto lignin, alpha-cellulose and holocellulose extracted from Coir pith were also studied. ESR signals of Cr(V) and Cr(III) were observed in Coir pith adsorbed Cr(VI) at solution pH 2, while ESR spectra of lignin extracted from Coir pith revealed only the Cr(III) signal. In addition, ESR signal of Cr(V) was observed in alpha-cellulose and holocellulose extracted from Coir pith adsorbed Cr(VI). These results confirmed that lignin in Coir pith reduced Cr(VI) to Cr(III) while alpha-cellulose and holocellulose extracted from Coir pith reduced Cr(VI) to Cr(V). The Cr(V) signal exhibited in ESR of alpha-cellulose and holocellulose might be bound with glucose in cellulose part of Coir pith. In addition, xylose which is main in pentosan part of Coir pith, indicated that it is involved in form complex with Cr(V) on Coir pith. The adsorption kinetic of Cr(VI) from aqueous solution on Coir pith was also investigated and described well with pseudo second order model. ESR and desorption experiments confirmed that Cr(VI), Cr(V) and Cr(III), exist in Coir pith after Cr(VI) adsorption. The desorption data indicated that the percentage of Cr(VI), Cr(V) and Cr(III) in Coir pith were 15.63%, 12.89% and 71.48%, respectively.
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column study of chromium vi adsorption from electroplating industry by coconut Coir pith
Journal of Hazardous Materials, 2008Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana NakbanpoteAbstract:Abstract The removal of Cr(VI) from electroplating wastewater by Coir pith was investigated in a fixed-bed column. The experiments were conducted to study the effect of important parameters such as bed depth (40–60 cm) and flow rate (10–30 ml min −1 ). At 0.05 C t / C 0 , the breakthrough volume increased as flow rate decreased or a bed depth increased due to an increase in empty bed contact time (EBCT). The bed depth service time model (BDST) fit well with the experimental data in the initial region of the breakthrough curve, while the simulation of the whole curve using non-linear regression analysis was effective using the Thomas model. The adsorption capacity estimated from the BDST model was reduced with increasing flow rate, which was 16.40 mg cm −3 or 137.91 mg Cr(VI) g −1 Coir pith for the flow rates of 10 ml min −1 and 14.05 mg cm −3 or 118.20 mg Cr(VI) g −1 Coir pith for the flow rates of 30 ml min −1 . At the highest bed depth (60 cm) and the lowest flow rate (10 ml min −1 ), the maximum adsorption reached 201.47 mg Cr(VI) g −1 adsorbent according to the Thomas model. The column was regenerated by eluting chromium using 2 M HNO 3 after adsorption studies. The desorption of Cr(III) in each of three cycles was about 67–70%. The desorption of Cr(III) in each cycle did not reach 100% due to the fact that Cr(V) was present through the reduction of Cr(VI), and was still in Coir pith, possibly bound to glucose in the cellulose part of Coir pith. Therefore, the Cr(V) complex cannot be desorbed in solution. The evidence of Cr(V) signal was observed in Coir pith, α-cellulose and holocellulose extracted from Coir pith using electron spin resonance (ESR).
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chromium removal from electroplating wastewater by Coir pith
Journal of Hazardous Materials, 2007Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana Nakbanpote, Supanee ChayabutraAbstract:Coir pith is a by-product from padding used in mattress factories. It contains a high amount of lignin. Therefore, this study investigated the use of Coir pith in the removal of hexavalent chromium from electroplating wastewater by varying the parameters, such as the system pH, contact time, adsorbent dosage, and temperature. The maximum removal (99.99%) was obtained at 2% (w/v) dosage, particle size <75m, at initial Cr(VI) 1647 mg l −1 , system pH 2, and an equilibrium time of 18 h. The adsorption isotherm of Coir pith fitted reasonably well with the Langmuir model. The maximum Cr(VI) adsorption capacity of Coir pith at 15, 30, 45 and 60 ◦ C was 138.04, 197.23, 262.89 and 317.65 mg Cr(VI) g −1 Coir pith, respectively. Thermodynamic parameters indicated an endothermic process and the adsorption process was favored at high temperature. Desorption studies of Cr(VI) on Coir pith and X-ray absorption near edge structure (XANES) suggested that most of the chromium bound on the Coir pith was in Cr(III) form due to the fact that the toxic Cr(VI) adsorbed on the Coir pith by electrostatic attraction was easily reduced to less toxic Cr(III). Fourier transform infrared (FT-IR) spectrometry analysis indicated that the carbonyl (C O) groups and methoxy (O–CH3) groups from the lignin structure in Coir pith may be involved in the mechanism of chromium adsorption. The reduced Cr(III) on the Coir pith surface may be bound with C O groups and O–CH3 groups through coordinate covalent bonding in which a lone pair of electrons in the oxygen atoms of the methoxy and carbonyl groups can be donated to form a shared bond with Cr(III).
Worana Nakbanpote - One of the best experts on this subject based on the ideXlab platform.
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mechanism of cr vi adsorption by Coir pith studied by esr and adsorption kinetic
Journal of Hazardous Materials, 2009Co-Authors: Parinda Suksabye, Akira Nakajima, Paitip Thiravetya, Yoshinari Aba, Worana NakbanpoteAbstract:The oxidation state of chromium in Coir pith after Cr(VI) adsorption from aqueous solution was investigated using electron spin resonance (ESR). To elucidate the mechanism of chromium adsorption on Coir pith, the adsorption studies of Cr(VI) onto lignin, alpha-cellulose and holocellulose extracted from Coir pith were also studied. ESR signals of Cr(V) and Cr(III) were observed in Coir pith adsorbed Cr(VI) at solution pH 2, while ESR spectra of lignin extracted from Coir pith revealed only the Cr(III) signal. In addition, ESR signal of Cr(V) was observed in alpha-cellulose and holocellulose extracted from Coir pith adsorbed Cr(VI). These results confirmed that lignin in Coir pith reduced Cr(VI) to Cr(III) while alpha-cellulose and holocellulose extracted from Coir pith reduced Cr(VI) to Cr(V). The Cr(V) signal exhibited in ESR of alpha-cellulose and holocellulose might be bound with glucose in cellulose part of Coir pith. In addition, xylose which is main in pentosan part of Coir pith, indicated that it is involved in form complex with Cr(V) on Coir pith. The adsorption kinetic of Cr(VI) from aqueous solution on Coir pith was also investigated and described well with pseudo second order model. ESR and desorption experiments confirmed that Cr(VI), Cr(V) and Cr(III), exist in Coir pith after Cr(VI) adsorption. The desorption data indicated that the percentage of Cr(VI), Cr(V) and Cr(III) in Coir pith were 15.63%, 12.89% and 71.48%, respectively.
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column study of chromium vi adsorption from electroplating industry by coconut Coir pith
Journal of Hazardous Materials, 2008Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana NakbanpoteAbstract:Abstract The removal of Cr(VI) from electroplating wastewater by Coir pith was investigated in a fixed-bed column. The experiments were conducted to study the effect of important parameters such as bed depth (40–60 cm) and flow rate (10–30 ml min −1 ). At 0.05 C t / C 0 , the breakthrough volume increased as flow rate decreased or a bed depth increased due to an increase in empty bed contact time (EBCT). The bed depth service time model (BDST) fit well with the experimental data in the initial region of the breakthrough curve, while the simulation of the whole curve using non-linear regression analysis was effective using the Thomas model. The adsorption capacity estimated from the BDST model was reduced with increasing flow rate, which was 16.40 mg cm −3 or 137.91 mg Cr(VI) g −1 Coir pith for the flow rates of 10 ml min −1 and 14.05 mg cm −3 or 118.20 mg Cr(VI) g −1 Coir pith for the flow rates of 30 ml min −1 . At the highest bed depth (60 cm) and the lowest flow rate (10 ml min −1 ), the maximum adsorption reached 201.47 mg Cr(VI) g −1 adsorbent according to the Thomas model. The column was regenerated by eluting chromium using 2 M HNO 3 after adsorption studies. The desorption of Cr(III) in each of three cycles was about 67–70%. The desorption of Cr(III) in each cycle did not reach 100% due to the fact that Cr(V) was present through the reduction of Cr(VI), and was still in Coir pith, possibly bound to glucose in the cellulose part of Coir pith. Therefore, the Cr(V) complex cannot be desorbed in solution. The evidence of Cr(V) signal was observed in Coir pith, α-cellulose and holocellulose extracted from Coir pith using electron spin resonance (ESR).
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chromium removal from electroplating wastewater by Coir pith
Journal of Hazardous Materials, 2007Co-Authors: Parinda Suksabye, Paitip Thiravetya, Worana Nakbanpote, Supanee ChayabutraAbstract:Coir pith is a by-product from padding used in mattress factories. It contains a high amount of lignin. Therefore, this study investigated the use of Coir pith in the removal of hexavalent chromium from electroplating wastewater by varying the parameters, such as the system pH, contact time, adsorbent dosage, and temperature. The maximum removal (99.99%) was obtained at 2% (w/v) dosage, particle size <75m, at initial Cr(VI) 1647 mg l −1 , system pH 2, and an equilibrium time of 18 h. The adsorption isotherm of Coir pith fitted reasonably well with the Langmuir model. The maximum Cr(VI) adsorption capacity of Coir pith at 15, 30, 45 and 60 ◦ C was 138.04, 197.23, 262.89 and 317.65 mg Cr(VI) g −1 Coir pith, respectively. Thermodynamic parameters indicated an endothermic process and the adsorption process was favored at high temperature. Desorption studies of Cr(VI) on Coir pith and X-ray absorption near edge structure (XANES) suggested that most of the chromium bound on the Coir pith was in Cr(III) form due to the fact that the toxic Cr(VI) adsorbed on the Coir pith by electrostatic attraction was easily reduced to less toxic Cr(III). Fourier transform infrared (FT-IR) spectrometry analysis indicated that the carbonyl (C O) groups and methoxy (O–CH3) groups from the lignin structure in Coir pith may be involved in the mechanism of chromium adsorption. The reduced Cr(III) on the Coir pith surface may be bound with C O groups and O–CH3 groups through coordinate covalent bonding in which a lone pair of electrons in the oxygen atoms of the methoxy and carbonyl groups can be donated to form a shared bond with Cr(III).
Mahbub Hasan - One of the best experts on this subject based on the ideXlab platform.
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improvement of physico mechanical properties of Coir polypropylene biocomposites by fiber chemical treatment
Materials & Design, 2013Co-Authors: Nazia Nafsin, Mahbub Hasan, Najib Hasan, Azman HassanAbstract:Abstract In preparing polymer–matrix composites, natural fibers are widely used as “reinforcing agents” because of their biodegradable characteristic. In present research, Coir fiber reinforced polypropylene biocomposites were manufactured using hot press method. In order to increase the compatibility between the Coir fiber and polypropylene matrix, raw Coir fiber was chemically treated with basic chromium sulfate and sodium bicarbonate salt in acidic media. Both raw and treated Coir at different fiber loading (10, 15 and 20 wt%) were utilized during composite manufacturing. During chemical treatment, hydrophilic –OH groups in the raw Coir cellulose were converted to hydrophobic –OH−Cr groups. Microstructural analysis and mechanical tests were conducted. Scanning electron microscopic analysis indicates improvement in interfacial adhesion between the Coir and polypropylene matrix upon treatment. Chemically treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 20% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
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chemical treatment of Coir fiber reinforced polypropylene composites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Nazrul IslamAbstract:Agro-based renewable materials have received significant attention in recent years because of their low cost, light weight, ecofriendliness, and worldwide environmental awareness. In the present work, Coir fiber reinforced polypropylene composites were manufactured using injection molding method. Raw Coir was chemically treated with benzene diazonium salt in alkali, acidic, and neutral media separately in order to increase the compatibility between the Coir fiber and polypropylene composite. During chemical treatment, hydrophilic -OH groups in the raw Coir cellulose were converted to hydrophobic -O–Na groups. Both raw and treated Coir at 10, 15, 20, 25, 30, and 35 wt % were utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Alkali treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
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chemical modification effect on the mechanical properties of Coir fiber
Engineering Journal, 2012Co-Authors: Syed M N Hasan, Md Jahangir Hossain, Mahbub HasanAbstract:Natural fiber has a vital role as a reinforcing agent due to its renewable, low cost, biodegradable, less abrasive and eco-friendly nature. Whereas synthetic fibers like glass, boron, carbon, metallic, ceramic and inorganic fibers are expensive and not eco-friendly. Coir is one of the natural fibers easily available in Bangladesh and cheap. It is derived from the husk of the coconut (Cocos nucifera). Coir has one of the highest concentrations of lignin, which makes it stronger. In recent years, wide range of research has been carried out on fiber reinforced polymer composites [4-13].The aim of the present research is to characterize brown single Coir fiber for manufacturing polymer composites reinforced with characterized fibers. Adhesion between the fiber and polymer is one of factors affecting the strength of manufactured composites. In order to increase the adhesion, the Coir fiber was chemically treated separately in single stage (with Cr 2 (SO 4 )3•12(H 2 O)) and double stages (with CrSO 4 and NaHCO 3 ). Both the raw and treated fibers were characterized by tensile testing, Fourier transform infrared (FTIR) spectroscopic analysis, scanning electron microscopic analysis. The result showed that the Young’s modulus increased, while tensile strength and strain to failure decreased with increase in span length. Tensile properties of chemically treated Coir fiber was found higher than raw Coir fiber, while the double stage treated Coir fiber had better mechanical properties compared to the single stage treated Coir fiber. Scanning electron micrographs showed rougher surface in case of the raw Coir fiber. The surface was found clean and smooth in case of the treated Coir fiber. Thus the performance of Coir fiber composites in industrial application can be improved by chemical treatment.
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mechanical properties of polypropylene composites reinforced with chemically treated Coir and abaca fiber
Journal of Reinforced Plastics and Composites, 2010Co-Authors: Mominul Haque, Rezaur Rahman, Mohammad Mojammel Huque, Nazrul Islam, Mahbub HasanAbstract:Coir and abaca fiber-reinforced polypropylene composites were manufactured using a single extruder and an injection molding machine. Raw Coir and abaca were chemically treated with benzene diazonium salt. Both raw and treated Coir and abaca fibers at level of fiber loading (10, 15, 20, 25, and 30 wt%) were utilized during composite manufacturing. Mechanical tests of the resultant composites and PP were conducted. A comparison has been made between the mechanical properties of the Coir and abaca fiber-reinforced composites. Chemically treated fiber-reinforced specimens yielded better mechanical properties compared to the raw composites, while Coir fiber composites had better mechanical properties than abaca fiber reinforced ones. Based on fiber loading, 30% fiber-reinforced composites had the optimum set of mechanical properties.
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Coir fiber reinforced polypropylene composites physical and mechanical properties
Advanced Composite Materials, 2010Co-Authors: Md Mominul Haque, Mahbub Hasan, Mohammad Mojammel Huque, Saiful Islam, Nazrul Islam, Sakinul IslamAbstract:Coir fiber reinforced polypropylene composites were manufactured using a single extruder and an injection molding machine. Raw Coir was chemically treated with benzene diazonium salt to increase its compatibility with the polypropylene matrix. Both raw and treated Coir fiber was utilized and five levels of fiber loading (15, 20, 25, 30 and 35 wt%) were used during composite manufacturing. Microstructural analysis (Fourier transform infrared spectroscopy and scanning electron microscopy) and mechanical (tensile, flexural, impact, hardness and water absorption) tests were conducted. Chemically treated Coir fiber reinforced specimens yielded better mechanical properties compared to the raw ones. For the fiber loaded samples, 30% fiber reinforced composites had the optimum set of mechanical properties. Authors propose that the bonding between the polypropylene matrix and chemically treated Coir fiber must be increased in order to have improved mechanical properties at higher fiber content.
Md Mominul Haque - One of the best experts on this subject based on the ideXlab platform.
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chemical treatment of Coir fiber reinforced polypropylene composites
Industrial & Engineering Chemistry Research, 2012Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Nazrul IslamAbstract:Agro-based renewable materials have received significant attention in recent years because of their low cost, light weight, ecofriendliness, and worldwide environmental awareness. In the present work, Coir fiber reinforced polypropylene composites were manufactured using injection molding method. Raw Coir was chemically treated with benzene diazonium salt in alkali, acidic, and neutral media separately in order to increase the compatibility between the Coir fiber and polypropylene composite. During chemical treatment, hydrophilic -OH groups in the raw Coir cellulose were converted to hydrophobic -O–Na groups. Both raw and treated Coir at 10, 15, 20, 25, 30, and 35 wt % were utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Alkali treated specimens yielded the best set of mechanical properties. On the basis of fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties among all composites manufactured.
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physico mechanical properties of chemically treated Coir reinforced polypropylene composites
Composites Part A-applied Science and Manufacturing, 2010Co-Authors: Md Nazrul Islam, Md Mominul Haque, Md Rezau Rahma, Mohammad Mojammel HuqueAbstract:The physico-mechanical properties of Coir reinforced polypropylene (PP) composites been investigated. In order to attain improved mechanical properties of the composites Coir was chemically treated with o-hydroxybenzene diazonium salt. Both raw and treated Coir samples were utilized for the fabrication of the composites. The mechanical properties of the composites prepared from chemically treated Coir are found to be much better compared to those of untreated ones. Tensile strengths of the composites of both raw and chemically treated Coir-PP composites showed a decreasing trend with increasing filler content. However, the values for the chemically treated Coir-PP composites at all mixing ratios are found to be higher than that of neat PP. The surface morphologies of the fractured surfaces of the composites were recorded using scanning electron microscopy (SEM) to gain information about the fiber–matrix interfacial adhesion in the composites.
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Coir fiber reinforced polypropylene composites physical and mechanical properties
Advanced Composite Materials, 2010Co-Authors: Md Mominul Haque, Mahbub Hasan, Mohammad Mojammel Huque, Saiful Islam, Nazrul Islam, Sakinul IslamAbstract:Coir fiber reinforced polypropylene composites were manufactured using a single extruder and an injection molding machine. Raw Coir was chemically treated with benzene diazonium salt to increase its compatibility with the polypropylene matrix. Both raw and treated Coir fiber was utilized and five levels of fiber loading (15, 20, 25, 30 and 35 wt%) were used during composite manufacturing. Microstructural analysis (Fourier transform infrared spectroscopy and scanning electron microscopy) and mechanical (tensile, flexural, impact, hardness and water absorption) tests were conducted. Chemically treated Coir fiber reinforced specimens yielded better mechanical properties compared to the raw ones. For the fiber loaded samples, 30% fiber reinforced composites had the optimum set of mechanical properties. Authors propose that the bonding between the polypropylene matrix and chemically treated Coir fiber must be increased in order to have improved mechanical properties at higher fiber content.
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physico mechanical properties of chemically treated palm and Coir fiber reinforced polypropylene composites
Bioresource Technology, 2009Co-Authors: Md Mominul Haque, Mahbub Hasan, Md Saiful IslamAbstract:In this work, palm and Coir fiber reinforced polypropylene bio-composites were manufactured using a single extruder and injection molding machine. Raw palm and Coir were chemically treated with benzene diazonium salt to increase their compatibility with the polypropylene matrix. Both raw and treated palm and Coir fiber at five level of fiber loading (15, 20, 25, 30 and 35 wt.%) was utilized during composite manufacturing. Microstructural analysis and mechanical tests were conducted. Comparison has been made between the properties of the palm and Coir fiber composites. Treated fiber reinforced specimens yielded better mechanical properties compared to the raw composites, while Coir fiber composites had better mechanical properties than palm fiber ones. Based on fiber loading, 30% fiber reinforced composites had the optimum set of mechanical properties.