TiO2协同增强ZIF-8光催化降解特性研究

摘要/Abstract

摘要： 工业有机废水污染危害人类健康,阻碍经济的发展,是当前急需解决的问题。金属有机骨架(MOFs)材料因其独特的孔道结构、较大的比表面积、优异的吸附性能,有望成为工业有机废水处理的潜在新材料。ZIF-8(沸石咪唑酯骨架-8)具有复杂的SOD拓扑结构和高稳定性,其工业废水吸附应用价值逐渐受到关注。本文首先通过溶胶-凝胶法和温度调控制备最佳相比例的锐钛矿/金红石混合相TiO₂纳米颗粒,采用溶剂法在TiO₂颗粒表面原位生长制备了包覆型ZIF-8复合材料。结果表明,引入10%(质量分数)TiO₂与ZIF-8构筑的复合材料对亚甲基蓝(MB)污染物的降解率和反应速率遵循一级动力学模型,分别是纯ZIF-8的1.27和2.3倍。可控制备且均匀分布在ZIF-8有机框架材料孔道中的Zn/ZnO_x纳米异质结作为活化位点,增加与MB分子的接触面积,提升对载流子的俘获数量,同时TiO₂与裸露的高活性异质结界面形成协同增强效应,构成立体催化降解复合体系,提高催化降解能力。

关键词: TiO₂@ZIF-8, 有机废水, 催化降解, 异质结, 协同增强

Abstract: Industrial organic wastewater pollution endangers human health and hinders economic development, which is an urgent problem to be solved. Metal-organic framework (MOFs) material is expected to be a potential new material for industrial organic wastewater treatment because of its unique pore structure, large specific surface area and excellent adsorption performance. Due to its complex SOD topological structure and high stability, ZIF-8 (zeolite imidazole ester skeleton-8) has attracted more and more attention to its application value in industrial wastewater adsorption. In this paper, the optimal phase ratio of anatase/rutile mixed phase TiO₂ nanoparticles were firstly prepared by the sol-gel method and temperature regulation, and the coated type ZIF-8 composite material was prepared by in-situ growth on the surface of the TiO₂ particles by the solvent method. The results show that the degradation rate and reaction rate of methylene blue (MB) pollutants in the composite material constructed by introducing 10% (mass fraction) TiO₂ and ZIF-8 follow the first-order kinetic model, which are 1.27 times and 2.3 times that of pure ZIF-8, respectively. The controlled preparation of the uniformly distributed Zn/ZnO_x nano-heterojunctions in the pores of the ZIF-8 organic framework materials served as the activation site, which increases the contact area with MB molecules and the capture number of carriers. At the same time, TiO₂ and the exposed highly active heterojunction interface formed a synergistic enhancement effect and a stereoscopic catalytic degradation complex system, which enhances the catalytic degradation ability.

Key words: TiO₂@ZIF-8, organic wastewater, catalytic degradation, heterojunction, synergistic enhancement

中图分类号:

TB332

徐行, 杜慧玲, 杜娴, 冉宏培, 吴亮, 李卓. TiO₂协同增强ZIF-8光催化降解特性研究[J]. 硅酸盐通报, 2021, 40(3): 1029-1037.

XU Hang, DU Huiling, DU Xian, RAN Hongpei, WU Liang, LI Zhuo. Photocatalytic Degradation Characteristics of ZIF-8 Synergistically Enhanced with TiO₂[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(3): 1029-1037.

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TiO₂协同增强ZIF-8光催化降解特性研究

Photocatalytic Degradation Characteristics of ZIF-8 Synergistically Enhanced with TiO₂

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