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负载UiO-66-NH的沸石咪唑酯骨架材料-8对染料的选择性吸附

Selective Dye Adsorption by Zeolitic Imidazolate Framework-8 Loaded UiO-66-NH.

作者信息

Zhang Hao, Shi Xiaobo, Li Jialiang, Kumar Parveen, Liu Bo

机构信息

School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255000, China.

Laboratory of Functional Molecules and Materials, School of Physics and Optoelectronic Engineering, Shandong University of Technology, Zibo 255000, China.

出版信息

Nanomaterials (Basel). 2019 Sep 8;9(9):1283. doi: 10.3390/nano9091283.

DOI:10.3390/nano9091283
PMID:31500352
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6781039/
Abstract

In this study, Zeolitic Imidazolate Framework-8 (ZIF-8)-loaded UiO-66-NH was synthesized, characterized, and analyzed for its potential to efficiently remove dyes. The selective adsorption on ZIF-8-loaded UiO-66-NH or its parent MOFs (UiO-66-NH and ZIF-8) in the mixed dyes solution was explored, including anionic dye (methyl orange (MO)) and cationic dyes (methylene blue (MB) and rhodamine B (RhB)). ZIF-8-loaded UiO-66-NH displayed much better selectivity to MB than its parent MOFs. Adsorption capacity of ZIF-8-loaded UiO-66-NH (173 mg/g) toward MB was found to be 215% higher than UiO-66-NH (55 mg/g). A kinetics study based on adsorption data demonstrated that the adsorption process most closely matched with the model of pseudo-second-order kinetic and Langmuir isotherm. The adsorption was an exothermic and spontaneous physical process as revealed by the values of thermodynamic parameters. Furthermore, reusability of ZIF-8-loaded UiO-66-NH was investigated and revealed the significant regeneration efficiency in adsorption capacity for MB even after four adsorption cycles. Experimental results proved that the interaction between ZIF-8-loaded UiO-66-NH and MB was mainly affected by the mechanism, for instance, electrostatic interaction as well as π-π stacking interactions.

摘要

在本研究中，合成了负载沸石咪唑酯骨架-8（ZIF-8）的UiO-66-NH，并对其进行了表征和分析，以评估其高效去除染料的潜力。研究了负载ZIF-8的UiO-66-NH或其母体金属有机框架（UiO-66-NH和ZIF-8）在混合染料溶液中的选择性吸附，包括阴离子染料（甲基橙（MO））和阳离子染料（亚甲基蓝（MB）和罗丹明B（RhB））。负载ZIF-8的UiO-66-NH对MB的选择性比其母体金属有机框架要好得多。发现负载ZIF-8的UiO-66-NH对MB的吸附容量（173 mg/g）比UiO-66-NH（55 mg/g）高215%。基于吸附数据的动力学研究表明，吸附过程与准二级动力学模型和朗缪尔等温线最为匹配。热力学参数值表明，吸附是一个放热的自发物理过程。此外，还研究了负载ZIF-8的UiO-66-NH的可重复使用性，结果表明，即使经过四个吸附循环，其对MB的吸附容量仍具有显著的再生效率。实验结果证明，负载ZIF-8的UiO-66-NH与MB之间的相互作用主要受静电相互作用以及π-π堆积相互作用等机制的影响。

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