Bi_(2)MoO_(6)/MIL-101(Cr)复合光催化剂的制备及其可见光催化降解双氯芬酸性能  

Preparation of Bi_(2)MoO_(6)/MIL-101(Cr)composite photocatalyst and its visible photocatalytic activity towards diclofenac degradation

作　　者：薛发生 蒋实 鲍健 万岁安 赵玉凤 崔龙哲[2,3] XUE Fasheng;JIANG Shi;BAO Jian;WAN Suian;ZHAO Yufeng;CUI Longzhe(Department of Ecology Environment of Hubei Province-Hanjiang Eco-environmental Monitoring Center,Xiantao 433000,Hubei China;South-Central Minzu University,College of Resources and Environment,Wuhan 430074,China;South-Central Minzu University,Key Laboratory of Resources Conversion and Pollution Control of the State Ethnic Affairs Commission,Wuhan 430074,China)

机构地区：[1]湖北省生态环境厅汉江生态环境监测中心,湖北仙桃433000 [2]中南民族大学资源与环境学院,武汉430074 [3]中南民族大学资源转化与污染控制国家民委重点实验室,武汉430074

出　　处：《中南民族大学学报(自然科学版)》2025年第4期447-454,共8页Journal of South-Central Minzu University(Natural Science Edition)

基　　金：中央高校基本科研业务费专项资金资助项目(CZQ23012)。

摘　　要：采用水热和共沉淀两步法制备Bi_(2)MoO_(6)复合金属有机骨架光催化材料(Bi_(2)MoO_(6)/MIL-101(Cr)和Bi_(2)MoO_(6)/NH2-MIL-101(Cr)),并将其用于可见光催化降解双氯芬酸钠(DCF).探究了复合材料组分配比和溶液p H值对降解DCF的影响.结果表明:与Bi_(2)MoO_(6)相比,复合催化剂对DCF具有更强的催化降解性能,Bi_(2)MoO_(6)/MIL-101(Cr)(BMM5)和Bi_(2)MoO_(6)/NH2-MIL-101(Cr)(BMNM5)的降解率均达到98%以上.在pH 4~6时,BMM5和BMNM5对DCF的光催化反应效率也均保持在97%.可见-紫外漫反射吸收光谱结果显示BMM5及BMNM5的禁带宽度分别为2.20 eV和1.80 eV.自由基捕获实验结果表明,光生空穴(h^(+))及超氧自由基(·O_(2)^(-))为降解过程中的主要活性物种.复合材料中的异质结能够加速电子和空穴的分离,促使更多的光生空穴和超氧自由基参与到对污染物的降解中.Bi_(2)MoO_(6)composite metal-organic framework photocatalytic materials,(Bi_(2)MoO_(6)/MIL-101(Cr),Bi_(2)MoO_(6)/NH2-MIL-101(Cr)),were prepared by hydrothermal coprecipitation method,and were used for the photocatalytic degradation of diclofenac(DCF).The effects of composites ratio and solution pH on the degradation of DCF were investigated.The results showed that,when compared with Bi_(2)MoO_(6),the composite catalysts showed much better catalytic performance towards DCF degradation,and the degradation rates on Bi_(2)MoO_(6)/MIL-101(Cr)(BMM5)and Bi_(2)MoO_(6)/NH2-MIL-101(Cr)(BNMM5)were both above 98%.At pH 4~6,the photocatalytic reaction efficiency of DCF on BMM5 and BNMM5 was also maintained at 97%.UV-vis DRS results showed that the band gaps of BMM5 and BMNM5 were 2.20 eV and 1.80 eV,respectively.The results of free radical trapping experiments showed that photogenerated holes(h^(+))and superoxide radicals(·O_(2)^(-))were the main active species in the degradation process.The heterojunction in composites can accelerate the separation of electrons and holes,thus promoting the production of h+and·O_(2)^(-)for pollutant degradation.

关 键 词：金属有机骨架 钼酸铋 双氯芬酸 可见光催化降解 

分 类 号：X131[环境科学与工程—环境科学]