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Augustine E Ofomaja - One of the best experts on this subject based on the ideXlab platform.
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kinetic study and sorption mechanism of Methylene blue and Methyl Violet onto mansonia mansonia altissima wood sawdust
Chemical Engineering Journal, 2008Co-Authors: Augustine E OfomajaAbstract:Abstract Batch sorption kinetic experiments were performed to study the adsorption of Methylene blue and Methyl Violet dyes from aqueous solution using mansonia wood sawdust as adsorbent. Operating variables studied include solution pH and particle size of sawdust. Maximum dye removal was observed at a basic pH 10 for both dyes. Sorption kinetic data was fitted to both pseudo-first and pseudo-second-order kinetic models. The experimental data were found to deviate from the straight line of the pseudo-first-order plots after 30 min for the Methylene blue and after 15 min for the Methyl Violet sorption. The pseudo-second-order kinetics was found to fit the experimental data and was able to consistently predict the amount of dye adsorbed over the sorption period and for the range of sawdust particle size used. The process mechanism was found to be complex, consisting of both mass transfer and intraparticle diffusion. Analysis of the sorption data using the Boyd's plot confirms mass transfer as the dominant mechanism for both Methylene blue and Methyl Violet sorption. Mass transfer mechanism was more predominant in the Methyl Violet sorption and became more dominant as the particle size of the sawdust material increased. This was confirmed by the values of effective diffusion parameter D i , which were found to be higher for Methylene blue, and reduced with increasing sawdust particle size. The molecular sizes of the basic dyes and the stability of the positive charge on the dyes played a significant role in their sorption onto the sawdust material.
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Effect of temperatures and pH on Methyl Violet biosorption by Mansonia wood sawdust
Bioresource Technology, 2008Co-Authors: Augustine E OfomajaAbstract:In this study, the effect of temperature on the equilibrium biosorption of Methyl Violet dye from aqueous solution using Mansonia wood sawdust was studied. The equilibrium biosorption data were analyzed using three widely applied isotherm models; Langmuir, Freundlich and Redlich–Peterson isotherm. The fit of three linear Langmuir isotherm forms, the Freundlich isotherm, and the Redlich–Peterson isotherm were determined using linear and the non-linear methods. Langmuir isotherm parameters obtained from the three Langmuir linear equations by using linear method were dissimilar, except, when the non-linear method was used. Best fits were yielded with Langmuir and Redlich–Peterson isotherms. The Methyl Violet biosorption was strongly dependent solution pH and percentage dye removal became significant above pH 7, which was slightly higher than the pHPZC of the sawdust material. In addition, various thermodynamic parameters, such as ΔG°, ΔH°, and ΔS° were calculated. Results suggested that the biosorption was a spontaneous and endothermic process.
Fatin, Dwi Maziyyah - One of the best experts on this subject based on the ideXlab platform.
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Pengaruh Pemanasan Terhadap Karakter dan Kemampuan Adsorpsi Serbuk Kayu Randu Untuk Zat Warna Methyl Violet 2B
PROSIDING SEMINAR NASIONAL ENERGI & TEKNOLOGI (SINERGI), 2018Co-Authors: Astuti Widi, Abdillah Hanif, Fatin, Dwi MaziyyahAbstract:Kapok sawdust is mainly composed of lignocellulose that enables it to act as an adsorbent. Heating process can degrade cellulose into volatile compounds followed by the formation of pores and new functional groups. It can increase the adsorption capacity. Thus, the main object of this paper is to study the effect of heating on the kapok sawdust toward the character and adsorption capacity for Methyl Violet dye. Heating process is carried out at a temperature of 105oC and 200oC for 1 hour. The adsorbent was analyzed mass reduction, the presence of functional groups and the adsorption capacity for Methyl Violet dye. In the adsorption process, the influence of pH, initial concentration of solution and adsorption time were studied. The results show that heating at 200oC can increase Methyl Violet adsorption for concentrations below 150 mg/l while at concentrations above 150 mg/l, heating at 105oC is more effective. The optimum condition of Methyl Violet adsorption by kapok sawdust was reached at pH of 7 while equilibrium was reached after 10 minuKayu randu mengandung lignoselulosa sehingga dapat digunakan sebagai adsorben. Pemanasan dapat mendegradasi selulosa menjadi senyawa yang mudah menguap diikuti dengan terbentuknya pori dan gugus fungsi baru yang dapat meningkatkan kemampuan adsorpsinya. Penelitian ini bertujuan mempelajari pengaruh pemanasan pada serbuk kayu randu terhadap karakter dan kapasitas adsorpsinya untuk zat warna Methyl Violet. Pemanasan dilakukan pada suhu 105oC dan 200oC selama 1 jam. Adsorben yang diperoleh dianalisis pengurangan massa, keberadaan gugus fungsi serta kemampuan adsorpsinya terhadap zat warna Methyl Violet 2B. Pada proses adsorpsi ini, pengaruh pH larutan, konsentrasi awal larutan dan waktu adsorpsi dipelajari. Hasil penelitian menunjukkan bahwa pemanasan pada 200oC dapat meningkatkan kemampuan adsorpsi zat warna Methyl Violet 2B pada konsentrasi dibawah 150 mg/l, sementara pada konsentrasi di atas 150 mg/l pemanasan pada suhu 105oC lebih efektif. Kondisi optimum adsorpsi Methyl Violet 2B dengan serbuk kayu randu dicapai pada pH 7 sementara waktu kesetimbangan dicapai setelah 10 menit. Berdasarkan uji desorpsi menggunakan aquades diketahui bahwa adsorpsi yang terjadi merupakan kemisorpsi
Dwi Maziyyah Fatin - One of the best experts on this subject based on the ideXlab platform.
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Pengaruh Pemanasan Terhadap Karakter dan Kemampuan Adsorpsi Serbuk Kayu Randu Untuk Zat Warna Methyl Violet 2B
2018Co-Authors: Widi Astuti, Hanif Abdillah, Dwi Maziyyah FatinAbstract:Kapok sawdust is mainly composed of lignocellulose that enables it to act as an adsorbent. Heating process can degrade cellulose into volatile compounds followed by the formation of pores and new functional groups. It can increase the adsorption capacity. Thus, the main object of this paper is to study the effect of heating on the kapok sawdust toward the character and adsorption capacity for Methyl Violet dye. Heating process is carried out at a temperature of 105oC and 200oC for 1 hour. The adsorbent was analyzed mass reduction, the presence of functional groups and the adsorption capacity for Methyl Violet dye. In the adsorption process, the influence of pH, initial concentration of solution and adsorption time were studied. The results show that heating at 200oC can increase Methyl Violet adsorption for concentrations below 150 mg/l while at concentrations above 150 mg/l, heating at 105oC is more effective. The optimum condition of Methyl Violet adsorption by kapok sawdust was reached at pH of 7 while equilibrium was reached after 10 minu
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ADSORPTION OF Methyl Violet DYE BY THERMALLY MODIFIED CEIBA PENTANDRA SAWDUST
Jurnal Bahan Alam Terbarukan, 2018Co-Authors: Widi Astuti, Dwi Maziyyah FatinAbstract:The disposal of synthetic dyes into the environment is an important source of water pollution. Methyl Violet, a typical cationic dye has been widely applied in industries, including textile industries.The dye causes the bad effect to the aquatic life because these compounds are quite stable and have low biodegradability. It presents an aesthetic problem and reduces photosynthetic activity. In this study, modified ceiba pentandra sawdust has been investigated as an adsorbent for the removal of Methyl Violet dye from aqueous solutions. The modification has been carried out using heating treatment at 110oC and 200oC for one hour. The FTIR spectra of raw and modified Ceiba pentandra sawdust were recorded using an FTIR technique (Perkin Elmer, USA) by the KBr pellet method. The spectrum was scanned in the range of 400 to 4000 cm-1 wavenumbers. The photomicrography of the exterior surface of raw and modified ceiba pentandra sawdust was obtained by SEM (JEOL, Japan). Batch studies were performed to address various experimental parameters including pH, contact time, and initial concentration for the removal of this dye. The results show that heating treatment increases the amount of Methyl Violet adsorbed. Effective pH for Methyl Violet adsorption was 7. A greater percentage of dye was removed with a decrease in the initial concentration of dye. Quasi-equilibrium reached in 30 min. Equilibrium isotherms were analysed by Langmuir and Freundlich isotherm equations. Freundlich equation is found to best represent the equilibrium data for Methyl Violet-modified kapok sawdust system.
Saeid Azizian - One of the best experts on this subject based on the ideXlab platform.
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Enhancement of Methyl Violet removal by modification of TiO2 nanoparticles with AgI
Journal of Industrial and Engineering Chemistry, 2012Co-Authors: Shila Jafari, Saeid Azizian, Babak JalehAbstract:Abstract Nanostructured AgI/TiO2 was synthesized by deposition–precipitation method. The AgI/TiO2 nanoparticles with different size were characterized using XRD and TEM methods. In order to compare the activity of these nanoparticles for removal of environmental pollutants, the adsorption of Methyl Violet by particles was studied. The equilibrium adsorption data were fitted to the different isotherms. The equilibrium data show that the modification of TiO2 nanoparticles with AgI, leads to the higher adsorption capacity (more than twice) for Methyl Violet. The kinetic data for adsorption of Methyl Violet indicates that modification of TiO2 with AgI leads to a stable adsorption.
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microwave assisted preparation of efficient activated carbon from grapevine rhytidome for the removal of Methyl Violet from aqueous solution
Journal of Analytical and Applied Pyrolysis, 2011Co-Authors: Mahtab Hejazifar, Saeid Azizian, Hassan Sarikhani, Dongyuan ZhaoAbstract:Grapevine rhytidome (the outer layer of bark on trunk), as an abundant and low-cost precursor, was used to prepare granular activated carbon with high surface area for the removal of Methyl Violet from aqueous solution. Microwave heating source was used to reduce the treatment time and energy consumption. To optimize the preparation, the effects of the different parameters, such as phosphoric acid concentration, acid/precursor weight ratio, impregnation time, microwave power, radiation time, and oven heating time on the ability of the samples for removal of Methyl Violet were studied. The obtained activated carbon was characterized by N2 adsorption/desorption, SAXS, TEM and SEM methods. The adsorption of Methyl Violet onto the activated carbon was studied from both equilibrium and kinetic point of view and the results were compared with the commercial granular activated carbon. The rate of adsorption onto the prepared activated carbon was faster than commercial activated carbon. Different kinetic models were used to analyze the experimental kinetic data. The obtained activated carbon showed higher adsorption capacity (more than twice) for the adsorption of Methyl Violet in comparison with the commercial one. The equilibrium data were analyzed using different isotherm models. Adsorption was found to be maximum in the pH range 7–9.
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Adsorption kinetics of Methyl Violet onto TiO2 nanoparticles with different phases
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2011Co-Authors: Sh. Jafari, Saeid Azizian, Babak JalehAbstract:TiO2 nanoparticles with different phase composition (anatase and rutile) were prepared from TiO2P25 Degussa by heat treatment and were characterized with XRD and TEM methods. It was found that both the particle size and rutile to anatase phase ratio increases with temperature. The adsorption of Methyl Violet from aqueous solution onto the prepared TiO2 nanoparticles with different was studied from kinetic point of view. The effect of phase composition on the adsorption kinetic was analyzed. The amount of adsorbed Methyl Violet reaches to its maximum vale within 100 min. It was found that the adsorption onto TiO2 with mixed phases of anatase and rutile is reversible while onto pure rutile phase is irreversible.
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Adsorption of Methyl Violet onto granular activated carbon: Equilibrium, kinetics and modeling
Chemical Engineering Journal, 2009Co-Authors: Saeid Azizian, Monireh Haerifar, Hadis BashiriAbstract:Abstract A batch system was applied to study the adsorption of Methyl Violet from aqueous solution by granular activated carbon. The adsorption studies include both equilibrium and kinetics. Equilibrium data were mathematically modeled using the Langmuir–Freundlich isotherm. The equilibrium data were fitted to the isotherm with n = 1 very well. Maximum adsorption capacity of 0.095 g/g at equilibrium was achieved. The kinetics of adsorption were evaluated by pseudo-first-order and pseudo-second-order models. Also extended geometric method has been applied to estimate the adsorption and desorption rate constants of Langmuir kinetics. By the obtained concentration-independent rate constants, the kinetics of adsorption were modeled by Langmuir kinetics. The stochastic numerical simulation has been applied to simulate the adsorption kinetic data of Methyl Violet at different concentrations.
B H Hameed - One of the best experts on this subject based on the ideXlab platform.
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equilibrium and kinetic studies of Methyl Violet sorption by agricultural waste
Journal of Hazardous Materials, 2008Co-Authors: B H HameedAbstract:Abstract In this work, sunflower (Helianthus annuus L.) seed hull (SSH), an agricultural waste, was evaluated for its ability to remove Methyl Violet (MV) from aqueous solutions. Sorption isotherm of MV onto the SSH was determined at 30 °C with the initial concentrations of MV in the range of 25–300 mg/L. The equilibrium data were analyzed using the Langmuir, Freundlich and Temkin isotherm models. The equilibrium process was described well by the Freundlich isotherm model. The maximum SSH sorption capacity was found to be 92.59 mg/L at 30 °C. The kinetic data were studied in terms of the pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The pseudo-second-order model best described the sorption process. A single-stage batch-adsorber design of the adsorption of MV onto SSH was studied based on the Freundlich isotherm equation. The results indicated that sunflower seed hull was an attractive candidate for removing Methyl Violet from aqueous solution.
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Equilibrium and kinetic studies of Methyl Violet sorption by agricultural waste.
Journal of hazardous materials, 2007Co-Authors: B H HameedAbstract:In this work, sunflower (Helianthus annuus L.) seed hull (SSH), an agricultural waste, was evaluated for its ability to remove Methyl Violet (MV) from aqueous solutions. Sorption isotherm of MV onto the SSH was determined at 30 degrees C with the initial concentrations of MV in the range of 25-300 mg/L. The equilibrium data were analyzed using the Langmuir, Freundlich and Temkin isotherm models. The equilibrium process was described well by the Freundlich isotherm model. The maximum SSH sorption capacity was found to be 92.59 mg/L at 30 degrees C. The kinetic data were studied in terms of the pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic models. The pseudo-second-order model best described the sorption process. A single-stage batch-adsorber design of the adsorption of MV onto SSH was studied based on the Freundlich isotherm equation. The results indicated that sunflower seed hull was an attractive candidate for removing Methyl Violet from aqueous solution.