The Experts below are selected from a list of 13170 Experts worldwide ranked by ideXlab platform
Amalina M Afifi - One of the best experts on this subject based on the ideXlab platform.
-
degradation of Methyl Orange and congo red by using chitosan polyvinyl alcohol tio2 electrospun nanofibrous membrane
International Journal of Biological Macromolecules, 2019Co-Authors: Umma Habiba, Bee Chin Ang, Jacky Jia Li Lee, Tan Chin Joo, Amalina M AfifiAbstract:Abstract In this study, chitosan/polyvinyl alcohol/TiO2 nanofiber was fabricated via electrospinning at a pump rate of 1.5 mL/h and voltage 6 kV. Field-emission scanning electron microscopic images showed bead free finer nanofiber. Fourier transform infrared spectra proved the formation of strong bond among chitosan, polyvinyl alcohol and TiO2. X-ray powder diffraction showed that TiO2 became amorphous in the composite nanofiber. Toughness and thermal stability of the chitosan/PVA nanofibrous membrane was increased with addition TiO2. The chitosan/PVA/TiO2 nanofibrous membrane was stable at basic medium. But degraded in acidic and water medium after 93 and 162 h, respectively. The adsorption mechanism of congo red obeyed the Langmuir isotherm model. On the other hand, adsorption characteristic of Methyl Orange fitted well with both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the resulting membrane for congo red and Methyl Orange is 131 and 314 mg/g, respectively. However, a high dose of adsorbent was required for congo red.
-
adsorption study of Methyl Orange by chitosan polyvinyl alcohol zeolite electrospun composite nanofibrous membrane
Carbohydrate Polymers, 2018Co-Authors: Umma Habiba, Tawsif A Siddique, Amalina M AfifiAbstract:Abstract The chitosan/polyvinyl Alcohol/zeolite electrospun composite nanofibrous membrane was fabricated for adsorption of Methyl Orange. The EDX, TGA and tensile test were carried out for the characterization of the membrane. The Young’s Modulus of the nanofibrous membranes increased by more than 100% with the addition of zeolite to chitosan/PVA. The batch adsorption tests were conducted by varying the initial concentration of Methyl Orange, contact time and pH of the dye solution. UV–vis results showed that most of the dye was adsorbed within 6 min. An adsorption kinetic study was carried out using the pseudo-second-order kinetic model, Lagergren-first-order model and intra particle diffusion model. The adsorption kinetics obeyed the Pseudo second order model. The adsorption mechanism was analyzed using the Langmuir and Freundlich isotherm model. The experimental data fits well with the Freundlich model. The adsorption capacity of the membrane was 153 mg/g. Adsorption capacity was decreased with increasing pH value. The resulting nanofiber became less active over Methyl Orange after several runs.
Umma Habiba - One of the best experts on this subject based on the ideXlab platform.
-
degradation of Methyl Orange and congo red by using chitosan polyvinyl alcohol tio2 electrospun nanofibrous membrane
International Journal of Biological Macromolecules, 2019Co-Authors: Umma Habiba, Bee Chin Ang, Jacky Jia Li Lee, Tan Chin Joo, Amalina M AfifiAbstract:Abstract In this study, chitosan/polyvinyl alcohol/TiO2 nanofiber was fabricated via electrospinning at a pump rate of 1.5 mL/h and voltage 6 kV. Field-emission scanning electron microscopic images showed bead free finer nanofiber. Fourier transform infrared spectra proved the formation of strong bond among chitosan, polyvinyl alcohol and TiO2. X-ray powder diffraction showed that TiO2 became amorphous in the composite nanofiber. Toughness and thermal stability of the chitosan/PVA nanofibrous membrane was increased with addition TiO2. The chitosan/PVA/TiO2 nanofibrous membrane was stable at basic medium. But degraded in acidic and water medium after 93 and 162 h, respectively. The adsorption mechanism of congo red obeyed the Langmuir isotherm model. On the other hand, adsorption characteristic of Methyl Orange fitted well with both Langmuir and Freundlich isotherm models. The maximum adsorption capacity of the resulting membrane for congo red and Methyl Orange is 131 and 314 mg/g, respectively. However, a high dose of adsorbent was required for congo red.
-
adsorption study of Methyl Orange by chitosan polyvinyl alcohol zeolite electrospun composite nanofibrous membrane
Carbohydrate Polymers, 2018Co-Authors: Umma Habiba, Tawsif A Siddique, Amalina M AfifiAbstract:Abstract The chitosan/polyvinyl Alcohol/zeolite electrospun composite nanofibrous membrane was fabricated for adsorption of Methyl Orange. The EDX, TGA and tensile test were carried out for the characterization of the membrane. The Young’s Modulus of the nanofibrous membranes increased by more than 100% with the addition of zeolite to chitosan/PVA. The batch adsorption tests were conducted by varying the initial concentration of Methyl Orange, contact time and pH of the dye solution. UV–vis results showed that most of the dye was adsorbed within 6 min. An adsorption kinetic study was carried out using the pseudo-second-order kinetic model, Lagergren-first-order model and intra particle diffusion model. The adsorption kinetics obeyed the Pseudo second order model. The adsorption mechanism was analyzed using the Langmuir and Freundlich isotherm model. The experimental data fits well with the Freundlich model. The adsorption capacity of the membrane was 153 mg/g. Adsorption capacity was decreased with increasing pH value. The resulting nanofiber became less active over Methyl Orange after several runs.
Yandong Duan - One of the best experts on this subject based on the ideXlab platform.
-
characterization and photocatalytic activity of poly 3 hexylthiophene modified tio2 for degradation of Methyl Orange under visible light
Journal of Hazardous Materials, 2009Co-Authors: Desong Wang, Jie Zhang, Xueyan Li, Yandong Duan, Jing AnAbstract:Abstract Poly(3-hexylthiophene) (P3HT) was synthesized via chemical oxidative polymerization with anhydrous FeCl 3 as oxidant, 3-hexylthiophene as monomer, chloroform as solvent. TiO 2 nanoparticles modified by a small amount of P3HT (TiO 2 /P3HT) were prepared by blending TiO 2 nanoparticles and P3HT in chloroform solution. The resulting photocatalysts were characterized by the methods of TEM, XRD, FT-IR, XPS and UV–vis diffuse reflectance spectroscope. The photocatalytic activity of TiO 2 /P3HT was investigated by degrading Methyl Orange under visible light. The degradation rate of Methyl Orange was 88.5 and 13.5% when it was degradated by TiO 2 /P3HT and neat TiO 2 (P-25) for 10 h, respectively. In addition, TiO 2 /P3HT nanocomposites showed excellent photocatalytic stability after 10 cycles under visible light irradiation. A possible mechanism for the photocatalytic oxidative degradation was also discussed.
-
characterization and photocatalytic activity of poly 3 hexylthiophene modified tio2 for degradation of Methyl Orange under visible light
Journal of Hazardous Materials, 2009Co-Authors: Desong Wang, Jie Zhang, Qingzhi Luo, Yandong DuanAbstract:Abstract Poly(3-hexylthiophene) (P3HT) was synthesized via chemical oxidative polymerization with anhydrous FeCl 3 as oxidant, 3-hexylthiophene as monomer, chloroform as solvent. TiO 2 nanoparticles modified by a small amount of P3HT (TiO 2 /P3HT) were prepared by blending TiO 2 nanoparticles and P3HT in chloroform solution. The resulting photocatalysts were characterized by the methods of TEM, XRD, FT-IR, XPS and UV–vis diffuse reflectance spectroscope. The photocatalytic activity of TiO 2 /P3HT was investigated by degrading Methyl Orange under visible light. The degradation rate of Methyl Orange was 88.5 and 13.5% when it was degradated by TiO 2 /P3HT and neat TiO 2 (P-25) for 10 h, respectively. In addition, TiO 2 /P3HT nanocomposites showed excellent photocatalytic stability after 10 cycles under visible light irradiation. A possible mechanism for the photocatalytic oxidative degradation was also discussed.
Dayanand Kalyani - One of the best experts on this subject based on the ideXlab platform.
-
decolorization and detoxification of sulfonated azo dye Methyl Orange by kocuria rosea mtcc 1532
Journal of Hazardous Materials, 2010Co-Authors: Ganesh K Parshetti, Amar A Telke, Dayanand KalyaniAbstract:Abstract Kocuria rosea (MTCC 1532) showed 100% decolorization of Methyl Orange (50 mg l−1) under static condition. The optimum pH and temperature for dye decolorization was 6.8 and 30 °C, respectively. The K. rosea (MTCC 1532) showed maximum decolorization of Methyl Orange when growth medium containing yeast extract as compared to other substrates. The culture exhibited significant ability to decolorize repeated additions of dye, with reduction in time up to 12 h at eighth dye aliquot addition. Significant induction of reductases (NADH-DCIP reductase and azoreductase) suggests its involvement in decolorization of Methyl Orange. The metabolites formed after decolorization of Methyl Orange, such as 4-amino sulfonic acid and N,N′-diMethyl p-phenyldiamine were characterized using FTIR and MS. Phytotoxicity and microbial toxicity study showed the Methyl Orange was toxic and metabolites obtained after its decolorization was nontoxic for experimental plants (Triticum aestivum and Phaseolus mungo) and bacteria (K. rosea, Pseudomonas aurugenosa and Azatobacter vinelandii).
-
decolorization and detoxification of sulfonated azo dye Methyl Orange by kocuria rosea mtcc 1532
Journal of Hazardous Materials, 2010Co-Authors: Ganesh K Parshetti, Dayanand Kalyani, Amar A Telke, Sanjay P GovindwarAbstract:Kocuria rosea (MTCC 1532) showed 100% decolorization of Methyl Orange (50 mg l(-1)) under static condition. The optimum pH and temperature for dye decolorization was 6.8 and 30 degrees C, respectively. The K. rosea (MTCC 1532) showed maximum decolorization of Methyl Orange when growth medium containing yeast extract as compared to other substrates. The culture exhibited significant ability to decolorize repeated additions of dye, with reduction in time up to 12 h at eighth dye aliquot addition. Significant induction of reductases (NADH-DCIP reductase and azoreductase) suggests its involvement in decolorization of Methyl Orange. The metabolites formed after decolorization of Methyl Orange, such as 4-amino sulfonic acid and N,N'-diMethyl p-phenyldiamine were characterized using FTIR and MS. Phytotoxicity and microbial toxicity study showed the Methyl Orange was toxic and metabolites obtained after its decolorization was nontoxic for experimental plants (Triticum aestivum and Phaseolus mungo) and bacteria (K. rosea, Pseudomonas aurugenosa and Azatobacter vinelandii).
Desong Wang - One of the best experts on this subject based on the ideXlab platform.
-
characterization and photocatalytic activity of poly 3 hexylthiophene modified tio2 for degradation of Methyl Orange under visible light
Journal of Hazardous Materials, 2009Co-Authors: Desong Wang, Jie Zhang, Xueyan Li, Yandong Duan, Jing AnAbstract:Abstract Poly(3-hexylthiophene) (P3HT) was synthesized via chemical oxidative polymerization with anhydrous FeCl 3 as oxidant, 3-hexylthiophene as monomer, chloroform as solvent. TiO 2 nanoparticles modified by a small amount of P3HT (TiO 2 /P3HT) were prepared by blending TiO 2 nanoparticles and P3HT in chloroform solution. The resulting photocatalysts were characterized by the methods of TEM, XRD, FT-IR, XPS and UV–vis diffuse reflectance spectroscope. The photocatalytic activity of TiO 2 /P3HT was investigated by degrading Methyl Orange under visible light. The degradation rate of Methyl Orange was 88.5 and 13.5% when it was degradated by TiO 2 /P3HT and neat TiO 2 (P-25) for 10 h, respectively. In addition, TiO 2 /P3HT nanocomposites showed excellent photocatalytic stability after 10 cycles under visible light irradiation. A possible mechanism for the photocatalytic oxidative degradation was also discussed.
-
characterization and photocatalytic activity of poly 3 hexylthiophene modified tio2 for degradation of Methyl Orange under visible light
Journal of Hazardous Materials, 2009Co-Authors: Desong Wang, Jie Zhang, Qingzhi Luo, Yandong DuanAbstract:Abstract Poly(3-hexylthiophene) (P3HT) was synthesized via chemical oxidative polymerization with anhydrous FeCl 3 as oxidant, 3-hexylthiophene as monomer, chloroform as solvent. TiO 2 nanoparticles modified by a small amount of P3HT (TiO 2 /P3HT) were prepared by blending TiO 2 nanoparticles and P3HT in chloroform solution. The resulting photocatalysts were characterized by the methods of TEM, XRD, FT-IR, XPS and UV–vis diffuse reflectance spectroscope. The photocatalytic activity of TiO 2 /P3HT was investigated by degrading Methyl Orange under visible light. The degradation rate of Methyl Orange was 88.5 and 13.5% when it was degradated by TiO 2 /P3HT and neat TiO 2 (P-25) for 10 h, respectively. In addition, TiO 2 /P3HT nanocomposites showed excellent photocatalytic stability after 10 cycles under visible light irradiation. A possible mechanism for the photocatalytic oxidative degradation was also discussed.
