Removal of lead ion from aqueous solution by Metal organic Framework

V. Safarifard, Hossein Shayegan, Yeganeh Davoudabadi Farahani
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Abstract

Since Pb(II) is one of the toxic water contamination agents, finding an efficient way to remove it from wastewater has become a serious issue in the world. Herein, a metal-organic framework, formulated as (TMU-23), with amide-decorated pores was prepared to investigate its potential in Pb(II) removal performance. At first, various determining factors including pH and adsorbent dosage were optimized. Then, the MOF adsorption capacity was measured about 434.7 mg. g. Moreover, reusability feature and effect of competitive cations were checked. Adsorptiondesorption tests showed that during three cycles, the MOF could act with favorable efficiency. Modeling calculations illustrate that pseudo-second-order and Langmuir models provide the best description for adsorption mode. Based on these models, monolayer adsorption behavior was responsible for adsorption process through chemical interaction between the analyte and the walls of MOF. Also, the possible adsorption mechanism was examined by exploiting of FTIR spectroscopy, EDS and SEM images. The significant affinity between amide groups of pillars and Pb(II) could cause good removal performance.
金属有机骨架去除水溶液中的铅离子
由于铅(II)是一种有毒的水污染剂,寻找一种有效的方法从废水中去除它已成为世界上一个重要的问题。本文制备了一种具有酰胺修饰孔的金属有机骨架(TMU-23),以研究其去除Pb(II)的潜力。首先对pH、吸附剂投加量等决定因素进行了优化。测得MOF的吸附量约为434.7 mg。g.此外,还检验了竞争状态的可重用性特征和效果。吸附和解吸试验表明,在三个循环过程中,MOF具有良好的吸附效率。模拟计算表明,拟二阶模型和Langmuir模型能较好地描述吸附模式。基于这些模型,单层吸附行为是通过分析物与MOF壁之间的化学相互作用进行吸附的。利用红外光谱(FTIR)、能谱(EDS)和扫描电镜(SEM)分析了其可能的吸附机理。柱的酰胺基团与Pb(II)具有显著的亲和性,具有良好的去除效果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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