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Adsorption study of hexavalent chromium using tamarind hull-based adsorbents

机译：罗望子壳型吸附剂对六价铬的吸附研究

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The adsorption characteristics of hexavalent chromium was studied with an adsorbent developed from waste tamarind hull.Experiments were conducted in batch mode to observe the influence of different parameters such as initial concentration of metal ions,adsorbent dosage,adsorbent particle size,stirrer speed,temperature and pH of the solution.Acidic pH strongly favored the adsorption.With decreasing the pH of the solution from 5.0 to 1.0,the removal of chromium was enhanced from 33% to 99%.The adsorption process was found to follow a pseudo-first-order rate mechanism and the rate constant was evaluated at 30 deg C.The Freundlich,Redlich-Peterson and the Fritz-Schlunder isotherm fit the equilibrium data satisfactorily.Adsorption of chromium was found to increase with increase in the process temperature.Using an adsorbent dosage of 1.0 g/L and an acidic pH (2.0),the equilibrium adsorption capacity of the prepared adsorbent was found to be about 70 mg/g at 30 deg C,which increased to about 81 mg/g at 50 deg C.The entropy change,free energy change and heats of adsorption were determined for the process.
机译：用废罗望子壳研制的吸附剂对六价铬的吸附特性进行了研究。分批进行了实验，观察了金属离子初始浓度，吸附剂用量，吸附剂粒径，刺激速度，温度和温度等不同参数的影响。溶液的pH值。酸性pH值强烈促进吸附。随着溶液pH值从5.0降低到1.0，铬的去除率从33％提高到99％。吸附过程遵循伪一级反应。速率机理和速率常数在30摄氏度下进行评估.Freundlich，Redlich-Peterson和Fritz-Schlunder等温线令人满意地拟合了平衡数据。发现铬的吸附量随过程温度的升高而增加。 1.0 g / L和酸性pH（2.0）时，制备的吸附剂在30℃下的平衡吸附容量约为70 mg / g，并增加至在50℃下为81mg / g。测定该过程的熵变，自由能变化和吸附热。

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