Activating Efficiency of Iron-copper Bimetallic Organic Framework MIL-101(Fe, Cu) Toward H2O2 for Degradation of Dyes

被引：3
|
作者：
Liang H. [1 ,2 ]
Liu R.-P. [2 ,3 ]
An X.-Q. [3 ]
Liu H.-J. [3 ]
机构：
[1] School of Environment, Northeast Normal University, Changchun
[2] Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing
[3] Center for Water and Ecology, School of Environment, Tsinghua University, Beijing
来源：
Huanjing Kexue/Environmental Science | 2020年 / 41卷 / 10期
关键词：
Bimetallic synergy; Dye wastewater; Fenton-like reaction; Hydroxyl radical (•OH); MIL-101(Fe; Cu);
D O I：
10.13227/j.hjkx.202003024
中图分类号：
学科分类号：
摘要：
Practical use of heterogeneous Fenton-like catalysis is inhibited by poor mass transfer and slow conversion of Fe(Ⅲ) to Fe(Ⅱ). In this study, we prepared a novel iron-copper bimetallic organic framework (MIL-101 (Fe, Cu)) using the solvothermal method, and carefully investigated its interfacial characters, catalytic efficacy toward dyes with methylene blue as a model pollutant, and the catalytic activating mechanisms involved in it. The MIL-101(Fe, Cu) exhibited a three-dimensional octahedral shape with a complete crystal structure. The specific BET surface area and average pore size were determined to be as high as 667.2 m2•g-1 and 1.9 nm, respectively. These characteristics benefits the exposure of the reactive sites and accelerates mass transfer accordingly. The MIL-101(Fe, Cu)/H2O2 exhibited promising efficiency toward the degradation of methylene blue in a wide pH range; moreover, at a pH value of 5, the removal efficiency observed was as high as 100% after 20 min of reaction, which was 43.1% and 88.9% higher than that of MIL-101(Fe)/H2O2 and H2O2, respectively. Hydroxyl radical (•OH) is a dominant active species involved in the degradation of methylene blue using MIL-101(Fe, Cu)/H2O2 as indicated in radicals quenching experiments. The results of species transformation in Fe and Cu indicated that Cu(Ⅱ) doping provided more active sites, and the Cu(Ⅱ)/Cu(Ⅰ) and Fe(Ⅲ)/Fe(Ⅱ) cycles synergistically facilitated •OH generation to improve the Fenton-like catalytic efficiency accordingly. The MIL-101(Fe, Cu) as a novel heterogeneous Fenton-like catalyst achieved good performance without any significant pH adjustment and is practically viable for industrial wastewater treatment. © 2020, Science Press. All right reserved.
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页码：4607 / 4614
页数：7
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