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首页> 外文期刊>Journal of Molecular Liquids >Separation of chromium (VI) from its liquid solution using new montmorillonite supported with amine based solvent
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Separation of chromium (VI) from its liquid solution using new montmorillonite supported with amine based solvent

机译:使用负载有胺基溶剂的新型蒙脱石从液体溶液中分离铬(VI)

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The present work deals with the study of Cr (VI) adsorption onto montmorillonite (MM) and modified montmorillonite (MMT). The modification is done by using an amine based solvent, trioctylamine (TOA). Equilibrium and kinetic experiments are carried out to determine the effect of adsorbent dose (w, 0.05 g to 0.3 g for MM, 0.01 g to 0.06 g for MMT), initial Cr (VI) concentration (C-0, 25 mg L-1 to 125 mg L-1), pH (I to 9), and contact time (t, 10 min to 100 min) on the capacity of both the adsorbents. With an increase in the adsorbent dosage, the uptake capacity of MM and MMT for Cr (VI) is found to decrease but with an enhancement in the recovery efficiency. The optimum dosage of MM and MMT is proposed to be 02 g and 0.02 g, respectively. A better adsorption of Cr (VI) is observed at low pH values of aqueous solution, and is decreased with an increase in the value of pH. In the kinetic experiments, the percentage removal of Cr (VI) reaches to a constant value of 70.68% with MM (0.2 g) and 33.92% with MMT (0.02 g) after 80 min. Equilibrium data are analysed by using Langmuir and Freundlich isotherm models. Kinetic models such as pseudo-first order (PFO) and pseudo-second order (PSO) are used to predict the kinetics of the adsorption process by MM and MMT for the Cr (VI) removal. (C) 2016 Elsevier B.V. All rights reserved.
机译:目前的工作涉及铬(VI)吸附在蒙脱石(MM)和改性蒙脱石(MMT)上的研究。通过使用基于胺的溶剂三辛胺(TOA)进行修饰。进行平衡和动力学实验以确定吸附剂量(w,MM为0.05 g至0.3 g,MMT为0.01 g至0.06 g),初始Cr(VI)浓度(C-0、25 mg L-1)的影响至125 mg L-1),pH(1至9)和接触时间(t,10分钟至100分钟)对两种吸附剂的容量影响。随着吸附剂剂量的增加,发现MM和MMT对Cr(VI)的吸收能力下降,但回收效率提高。 MM和MMT的最佳剂量分别建议为02 g和0.02 g。在水溶液的低pH值下,可以更好地吸附Cr(VI),并随着pH值的增加而降低。在动力学实验中,在80分钟后,MM(0.2 g)对Cr(VI)的去除率达到恒定值70.68%,MMT(0.02 g)对Cr(VI)的去除率达到33.92%。平衡数据使用Langmuir和Freundlich等温线模型进行分析。动力学模型(例如伪一级(PFO)和伪二级(PSO))用于预测MM和MMT去除Cr(VI)的吸附过程的动力学。 (C)2016 Elsevier B.V.保留所有权利。

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