Adsorption of methylene blue and malachite green from aqueous solution by sulfonic acid group modified MIL-101
Adsorption of methylene blue and malachite green from aqueous solution by sulfonic acid group modified MIL-101
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磺酸基修饰的MIL-101对水溶液中亚甲基蓝和孔雀石绿的吸附
DOI：
10.1016/j.micromeso.2016.09.032
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发表时间：
2017-01-01
影响因子：
5.2
通讯作者：
Li, Bing
中科院分区：
文献类型：
--
作者：
Luo, Xi-Ping;Fu, Sheng-Yuan;Li, Bing
直接合成了一种含磺酸基的金属有机骨架（MIL-101-SO 3 H），并将其应用于水溶液中亚甲基蓝（MB）和孔雀石绿色（MG）的去除。采用XRD、TEM、XPS、N2吸附-脱附分析和元素分析等手段对MIL-101-SO 3 H进行了表征。MIL-101-SO 3 H主要具有中孔、高比表面积、大孔容和阴离子基团，有利于阳离子染料的吸附。研究了MIL-101-SO 3 H对染料的吸附等温线、热力学参数和动力学特性。利用Langmuir等温方程对实验数据进行了分析，结果表明Langmuir等温方程能够较好地描述吸附行为。热力学参数由吉布斯自由能函数计算，证实吸附过程是自发的、吸热的和熵驱动的。吸附机理可用准二级动力学模型和颗粒内扩散模型来描述。在实验范围内，MIL-101-SO 3 H对染料的吸附量随初始pH值的升高而增大。这些结果表明，在低pH值下，MB和MG的芳香环与MIL-101-SO 3 H之间的相互作用主要是π-π相互作用，随着初始pH值的升高，静电相互作用逐渐增强。(C)2016 Elsevier Inc. All rights reserved.
A metal-organic framework (MOF) with sulfonic acid group (denoted as MIL-101-SO3H) was directly synthesized without post-synthesis method and applied to remove methylene blue (MB) and malachite green (MG) from aqueous solution. Characterizations of MIL-101-SO3H were achieved by XRD, TEM, XPS, nitrogen adsorption-desorption analysis and elemental analysis. MIL-101-SO3H mainly possessed mesopore, high surface area, big pore volume and anionic group which are benefit for the adsorption of cationic dye. The adsorption isotherm, thermodynamic parameters and kinetics characteristic of dye adsorption onto MIL-101-SO3H were investigated. The experimental isotherm data were analyzed using Langmuir isotherm equation and the results indicated the Langmuir isotherm was suitable to describe the adsorption behaviors. Thermodynamic parameters calculated by the Gibbs free energy function, confirm the adsorption process was spontaneous, endothermic and entropy-driven. The pseudo-second order and intraparticle diffusion, were employed to obviously describe the adsorption mechanism. The dye adsorption capacities of MIL-101-SO3H were found to increase as the initial pH values in the experimental ranges. These results suggested the pi-pi interactions between the aromatic rings of MB and MG with MIL-101-SO3H may be mainly interactions in low pH values and electrostatic interactions can gradually increase with increasing initial pH values. (C) 2016 Elsevier Inc. All rights reserved.