Biosorption of heavy metals using plant based materials contributes a significant role in reducing environmental pollution. Here, we investigated removal of hexavalent chromium metal [Cr (VI)] from an aqueous solution by alkali treated novel biosorbent prepared from Calotropis gigantea(L.) Dryand. ex W.T. Aiton leaves and flower. Batch studies were conducted to examine the process parameters. The effect of pH, biomass dosage, initial metal ion concentration, contact time was evaluated keeping temperature and agitation speed constant. As much as 70% removal of Cr (VI) was observed with a leaf biomass dosage of 4 g/L at pH 2.0 and initial metal ion concentration of 1.0 ppm. data obtained from the experiment were used to calculate the equilibrium data with two variable isothermal models. Freundlich and Temkin isotherm models suited the process for leaves and petals, respectively. Pseudo second order reaction suited in the kinetic study. The data obtained from the study suggests that biosorbents derived from C. gigantea has effective chromium biosorption capability. The results indicate that C. gigantea could be used as an efficient, cost effective and environmental friendly biosorbent for the treatment of chromium contaminated water bodies.

中文翻译：

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使用来自Calotropis gigantea的新型生物吸附剂进行铬（VI）吸附

使用植物基材料对重金属的生物吸附在减少环境污染方面发挥了重要作用。在这里，我们研究了由Calotropis gigantea制备的碱处理新型生物吸附剂从水溶液中去除六价铬金属[Cr（VI）]的方法。（L.）德赖恩。前WT Aiton叶子和花。进行了批量研究以检查工艺参数。在保持温度和搅拌速度恒定的情况下，评估了pH，生物量，初始金属离子浓度，接触时间的影响。在pH 2.0和初始金属离子浓度为1.0 ppm的情况下，叶片生物量为4 g / L时，可去除多达70％的Cr（VI）。从实验获得的数据用于通过两个可变等温模型计算平衡数据。Freundlich和Temkin等温模型分别适合叶片和花瓣的过程。伪二级反应适合动力学研究。从研究中获得的数据表明，源自巨大假丝酵母的生物吸附剂具有有效的铬生物吸附能力。结果表明C. gigantea可以用作一种高效，低成本，环保的生物吸附剂，用于处理受铬污染的水体。