Adsorption behavior of metal-organic frameworks for methylene blue from aqueous solution
Adsorption behavior of metal-organic frameworks for methylene blue from aqueous solution
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DOI：
10.1016/j.micromeso.2014.03.004
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发表时间：
2014-07-15
影响因子：
5.2
通讯作者：
Zhang, Jishuang
中科院分区：
文献类型：
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作者：
Lin, Shuang;Song, Zhilong;Zhang, Jishuang
采用基于苯三羧酸铜的金属-有机骨架（mof）吸附水溶液中的亚甲基蓝（MB）。Cu-BTC [BTC = 1,3,5-苯三羧酸酯，又称HKUST-1]是一种被广泛研究的MOF。Cu-BTC主要具有中孔、高比表面积和大孔容，有利于提高吸附容量。通过XRD、SEM、氮气吸附-解吸分析和FT-IR光谱对Cu-BTC进行了表征。分析了其动力学特性和热力学参数。采用Langmuir等温线方程和Freundlich等温线方程对实验等温线数据进行了分析，结果表明Langmuir等温线更适合MB吸附。热力学参数由吉布斯自由能函数计算，证实了吸附过程是自发的，并伴有放热。在pH = 7.0时达到最大去除率。研究了Cu-BTC吸附MB的可能机理和吸附行为。吸附剂Cu-BTC经乙醇洗涤后易于再生。实验结果表明，Cu-BTC材料在含MB染料废水处理中具有潜在的应用前景。(C) 2014年由Elsevier Inc.出版。
A metal-organic frameworks (MOFs) based on copper-benzenetricarboxylates was applied to the adsorption of methylene blue (MB) from aqueous solution. Cu-BTC [BTC = 1,3,5-benzenetricarboxylatel also known as HKUST-1 is a widely studied MOF. Cu-BTC mainly possessed mesopores, high surface area and big pore volume which is benefit for the adsorption capacity. Characterization of Cu-BTC were achieved by XRD, SEM micrographs, nitrogen adsorption-desorption analysis and FT-IR spectra. The kinetics characteristic and thermodynamic parameters were also analyzed. The experimental isotherms data were analyzed using Langmuir and Freundlich isotherm equations and the results indicated that the Langmuir isotherm showed a better fit for MB adsorption. Thermodynamic parameters were calculated by the Gibbs free energy function, confirming that the adsorption process was spontaneous and accompanied by exothermic. The maximum removal has been achieved at the pH = 7.0. The possible mechanism and the adsorption behavior of the adsorption of MB onto Cu-BTC were investigated. The adsorbent Cu-BTC could be easily regenerated after washing with ethanol. The experimental results suggested that Cu-BTC materials have potential application for the wastewater treatment containing MB dye. (C) 2014 Published by Elsevier Inc.