首页> 外文期刊>International Research Journal of Pure and Applied Chemistry >Optimization and Kinetic Study for the Removal ofChromium (VI) Ions by Acid Treated SawdustChitosan Composite Beads
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Optimization and Kinetic Study for the Removal ofChromium (VI) Ions by Acid Treated SawdustChitosan Composite Beads

机译:酸处理过的木屑壳聚糖复合珠粒去除铬(VI)的优化和动力学研究

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Aims: To study the adsorption efficiency of acid-treated sawdust composite beads (SDCCB) for Cr(VI) ions and to optimize the process variables using Response Surface Methodology (RSM).Study Design: Preparation of SDCCB, Characterization of SDCCB, Study of influence of variables on adsorption efficiency of SDCCB for Cr(VI) ions from aqueous solutions and optimization of process variables using RSM.Place of Study: Department of Chemistry, Khadir Mohideen College, Adirampattinam, Tamilnadu, India.Methodology and Results: The morphology and surface properties of the adsorbent have been characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and BET analyzer. RSM has been used to optimize the process variables such as initial metal ion concentration, adsorbent dosage and pH of the solution on the performance of percentage removal of Cr(VI) ions and adsorption capacity of SDCCB. Various isotherm and kinetic models have been fitted with experimental data to describe the solute interaction and behaviour of rate controlled mechanism with the adsorbent in batch studies.Conclusion: SDCCB is an effective, economic and eco-friendly adsorbent for the removal of nearly 95% of Cr(VI) from aqueous solutions. The mathematical model development and optimization for adsorption of Cr(VI) using statistical design of experiments appears to be a useful tool to predict and understanding the interaction effects between process variables. The isotherm models for the experimental data followed is in the order of Freundlich Langmuir Temkin isotherm for adsorption of Cr(VI) ions and adsorption kinetics fit suitably in a pseudo second order kinetic model. The activation parameters evaluated points out that the adsorption of Cr(VI) on SDCCB surface is an endothermic chemisorption process.
机译:目的:研究用酸处理的木屑复合珠(SDCCB)对Cr(VI)离子的吸附效率,并使用响应表面法(RSM)优化工艺变量。研究设计:SDCCB的制备,SDCCB的表征,变量对SDCCB吸附水溶液中Cr(VI)离子的效率的影响以及使用RSM优化工艺变量研究地点:印度泰米尔纳德邦阿迪兰帕蒂南的Khadir Mohideen学院化学系方法和结果:形态学和吸附剂的表面性质已通过扫描电子显微镜(SEM),傅立叶变换红外光谱(FTIR)和BET分析仪进行了表征。 RSM已用于优化工艺变量,例如初始金属离子浓度,溶液的吸附剂剂量和pH值对Cr(VI)离子去除百分率和SDCCB吸附性能的影响。在批量研究中,各种等温线和动力学模型已经拟合了实验数据,描述了速率控制机制与吸附剂的溶质相互作用和行为。结论:SDCCB是一种有效,经济和环保的吸附剂,可去除近95%的污染物。水溶液中的Cr(VI)。利用实验的统计设计开发和优化吸附Cr(VI)的数学模型似乎是预测和理解过程变量之间相互作用影响的有用工具。随后用于实验数据的等温模型按Freundlich> Langmuir> Temkin等温线的顺序进行,用于吸附Cr(VI)离子,并且吸附动力学适合于伪二级动力学模型。评估的活化参数指出,SDCCB表面的Cr(VI)吸附是吸热化学吸附过程。

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