NH2-UiO-66机械催化降解染料的性能研究

doi:10.15541/jim20190542

摘要/Abstract

摘要：

作为类铁电材料, 金属有机骨架材料的机械催化降解染料性能的研究还鲜有报道。本研究采用溶剂热法合成了氨基化的Zr基MOF材料NH₂-UiO-66, 并将其应用于以超声为机械振动源催化降解染料罗丹明B。结果表明: 在超声振动5 h后罗丹明B的降解率可达80%, 且NH₂-UiO-66表现出良好的稳定性; 自由基捕获实验表明超声机械振动可诱导NH₂-UiO-66表面产生正负电荷, 进而形成具有强氧化活性的羟基自由基来分解染料分子。将MOF材料的机械催化技术应用在染料废水处理具有潜在的价值。

关键词: 金属有机骨架材料, NH₂-UiO-66, 铁电材料, 机械催化, 染料降解

Abstract:

Metal-organic frameworks (MOF) as piezoelectrical materials used in mechano-catalytic degradation of organic dye are rarely investigated. In this work, NH₂-UiO-66 was synthesized by the solvothermal method and applied in mechano-catalytic degradation of Rhodamine B under ultrasonic vibration. The results show that NH₂- UiO-66 behaves a high mechano-catalytic decomposition efficiency of 80% for Rhodamine B within 5 h vibration and possesses a good stability. The piezoelectrically induced electric charges on the surfaces of NH₂-UiO-66 via the piezoelectric effect could induce hydroxyl radicals as strong oxidants to decompose Rhodamine B. The piezoelectrical effect of MOFs is potential in utilizing vibration energy for dye wastewater treatment.

Key words: metal-organic frameworks, NH₂-UiO-66, piezoelectrical materials, mechano-catalysis, dye degradation

中图分类号:

TQ174

张信聪,郭珂,彭莲莲,吴结宇,张富民,朱伟东,傅仰河. NH₂-UiO-66机械催化降解染料的性能研究[J]. 无机材料学报, 2020, 35(9): 1023-1028.

ZHANG Xincong,GUO Ke,PENG Lianlian,WU Jieyu,ZHANG Fumin,ZHU Weidong,FU Yanghe. Degradation of Dye Wastewater over NH₂-UiO-66: Piezoelectrically Induced Mechano-Catalytic Effect[J]. Journal of Inorganic Materials, 2020, 35(9): 1023-1028.

图/表 7

图1 NH2-UiO-66的表征图谱

Fig. 1 Characterizations of NH2-UiO-66 (a) XRD patterns; (b) FT-IR spectra; (c) SEM image; (d) N2 adsorption-desorption isotherm; (e) Ferroelectric hysteresis loop

图2 NH2-UiO-66吸附罗丹明B溶液平衡曲线图

Fig. 2 Equilibrium curve for the adsorption of RhB over NH2- UiO-66

图3 不同超声波频率下NH2-UiO-66机械催化降解RhB溶液的结果

Fig. 3 Degradation results of RhB solution over NH2-UiO-66 under ultrasound with different frequencies

图4 不同降解时间后催化剂的固体粉末紫外-可见漫反射图谱

Fig. 4 UV-Vis DRS of NH2-UiO-66 with different ultrasonic vibration time

图5 不同条件下罗丹明B溶液的降解结果

Fig. 5 Degradation results of RhB solution under different conditions (a) NH2-UiO-66 without vibration; (b) Vibration without catalyst; (c) Vibration+NH2-UiO-66+EDTA; (d) Vibration+NH2-UiO-66+BQ; (e) Vibration+NH2-UiO-66+IPA; (f) Vibration+NH2-UiO-66

图6 NH2-UiO-66机械催化降解RhB机理示意图

Fig. 6 Schematic diagram for the mechano-catalytic degradation of RhB over NH2-UiO-66

图7 NH2-UiO-66机械催化RhB循环利用5次实验结果

Fig. 7 Reusability of NH2-UiO-66 in the mechano-catalytic degradation of RhB

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NH₂-UiO-66机械催化降解染料的性能研究

Degradation of Dye Wastewater over NH₂-UiO-66: Piezoelectrically Induced Mechano-Catalytic Effect

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