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Selective Removal of Hexavalent Chromium from Wastewater by Rice Husk: Kinetic, Isotherm and Spectroscopic Investigation
Water ( IF 3.4 ) Pub Date : 2021-01-22 , DOI: 10.3390/w13030263
Usman Khalil , Muhammad Bilal Shakoor , Shafaqat Ali , Sajid Rashid Ahmad , Muhammad Rizwan , Abdulaziz Abdullah Alsahli , Mohammed Nasser Alyemeni

Chromium (Cr) in water bodies is considered as a major environmental issue around the world. In the present study, aqueous Cr(VI) adsorption onto rice husk was studied as a function of various environmental parameters. Equilibrium time was achieved in 2 h and maximum Cr(VI) adsorption was 78.6% at pH 5.2 and 120 mg L−1 initial Cr(VI) concentration. In isotherm experiments, the maximum sorption was observed as 379.63 mg g−1. Among four isotherm models, Dubinin–Radushkevich and Langmuir models showed the best fitting to the adsorption data, suggesting physical and monolayer adsorption to be the dominant mechanism. The kinetic modeling showed that a pseudo-second order model was suitable to describe kinetic equilibrium data, suggesting a fast adsorption rate of Cr(VI). The results of FTIR spectroscopy indicated that mainly –OH and C–H contributed to Cr(VI) adsorption onto rice husk. This paper provided evidence that rice husk could be a cost-effective, environment-friendly and efficient adsorptive material for Cr(VI) removal from wastewater due to its high adsorption capacity.

中文翻译:

稻壳选择性去除废水中的六价铬:动力学,等温线和光谱研究

水体中的铬(Cr)被认为是世界范围内的主要环境问题。在本研究中,研究了将Cr(VI)水溶液吸附到稻壳上的各种环境参数。在2小时内达到平衡时间,在pH 5.2和120 mg L -1初始Cr(VI)浓度下,最大Cr(VI)吸附率为78.6%。在等温线实验中,最大吸附量为379.63 mg g -1。在四个等温模型中,Dubinin–Radushkevich和Langmuir模型显示出最适合吸附数据,表明物理和单层吸附是主要机理。动力学模型表明拟二阶模型适合描述动力学平衡数据,表明Cr(VI)的快速吸附速率。FTIR光谱结果表明,主要–OH和C–H有助于Cr(VI)吸附在稻壳上。本文提供的证据表明,稻壳由于其高吸附能力,可以作为一种经济高效,环保且高效的吸附剂,用于去除废水中的六价铬。
更新日期:2021-01-22
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