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首页> 外文期刊>RSC Advances >Confluence of montmorillonite and Rhizobium towards the adsorption of chromium(vi) from aqueous medium
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Confluence of montmorillonite and Rhizobium towards the adsorption of chromium(vi) from aqueous medium

机译：蒙脱土和根瘤菌对水介质中铬（vi）吸附的融合

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Chromium in its hexavalent oxidation state is carcinogenic and wastewater from the electroplating industry is one of the principal sources of pollution. To reduce this toxicity and pave way towards environmental safety, a combination of environmental microbiology and chemistry is quite efficient for developing biosorbents to sequester chromium from waste water. Immobilization of Rhizobium in sodium montmorillonite provides a conducive environment to capture hexavalent chromium. Various characterization techniques such as FTIR, XPS and SEM-EDAX were performed and batch parameters such as pH variation, adsorbent dosage, concentration of metal ion and temperature were optimized. Pseudo second order kinetics coupled with a higher regression coefficient for Freundlich isotherm and a Langmuir adsorption capacity of 22.22 mg g ~(?1) was achieved for the adsorption process. The adsorption was enhanced by the charge interactions between the protonated clay- Rhizobium surface and Cr( VI ) ions in acidic medium. The biosorbent was stable and easily regenerated using NaOH. Preliminary column studies were performed to test the efficiency of the developed biosorbent at higher volumes on a laboratory scale.
机译：六价铬态的铬具有致癌性，电镀行业的废水是主要的污染源之一。为了减少这种毒性并为实现环境安全铺平道路，环境微生物学和化学方法的结合对于开发生物吸附剂以从废水中隔离铬非常有效。根瘤菌固定在蒙脱酸钠中提供了一个有利的环境来捕获六价铬。进行了各种表征技术，例如FTIR，XPS和SEM-EDAX，并优化了批处理参数，例如pH值变化，吸附剂用量，金属离子浓度和温度。伪二阶动力学加上较高的Freundlich等温线回归系数，吸附过程的Langmuir吸附容量为22.22 mg g〜（？1）。质子化的粘土-根瘤菌表面与酸性介质中的Cr（VI）离子之间的电荷相互作用增强了吸附。该生物吸附剂是稳定的，并且使用NaOH容易再生。进行了初步的柱研究，以在实验室规模下以更高的体积测试开发的生物吸附剂的效率。

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