摘要
光催化被广泛用于去除水中的难降解有机污染物,但是由于光生电子和空穴的复合率高,抑制了半导体光催化剂的催化活性。本研究通过简便的溶剂热法成功制备了一种BiOBr/ZnMoO_(4)复合材料。通过结构分析、原位XPS、功函数测试、自由基捕获及电子顺磁共振(ESR)实验等证实了BiOBr/ZnMoO_(4)复合材料形成了S型异质结。实验结果表明,适当ZnMoO_(4)含量的BiOBr/ZnMoO_(4)异质结可以显著提高BiOBr的光催化性能。与纯BiOBr、ZnMoO_(4)相比,质量分数15%BiOBr/ZnMoO_(4)在可见光下表现出最佳的光催化活性,双酚A的光催化降解率达到85.3%(90 min),环丙沙星的光降解速率常数分别是BiOBr的2.6倍和ZnMoO_(4)的484倍。这可归因于BiOBr和ZnMoO_(4)之间形成了紧密的界面结合和S型异质结,使得光生载流子可以实现有效的空间分离和转移。这项工作为定向合成Bi基S型异质结复合光催化材料提供了一种简便有效的方法,对进一步理解Bi基多元异质结光催化材料的构效关系提供了新的理论和实验基础。
Photocatalysis is widely used for the removal of refractory organic pollutants in water,but the catalytic activity of semiconductor photocatalysts is significantly inhibited due to the high recombination rate of photogenerated electrons and holes.In this study,an S-scheme BiOBr/ZnMoO_(4)composite was successfully prepared by a facile solvothermal method.The structure analysis,in-situ XPS,work function test,free radical capture and ESR experiment confirmed that the BiOBr/ZnMoO_(4)composite formed an S-scheme heterojunction.The experimental results show that BiOBr/ZnMoO_(4)heterojunction with appropriate ZnMoO_(4)content can significantly improve the photocatalytic performance of BiOBr.Compared with pure BiOBr and ZnMoO_(4),15%BiOBr/ZnMoO_(4)exhibits the best photocatalytic activity under visible light irradiation,and the photocatalytic degradation rate of bisphenol A reaches 85.3%(90 min).The rate constants of photodegradation of ciprofloxacin are 2.6 times that of BiOBr and 484 times that of ZnMoO_(4),respectively.This can be attributed to the tight interfacial bonding between BiOBr and ZnMoO_(4)and the formation of S-scheme heterojunction,which enables the efficient spatial separation and transfer of photogenerated carriers.This work provides a simple and efficient method for the directional synthesis of Bi-based S-scheme heterojunction photocatalytic materials,and provides a new theory and experimental basis for further understanding of the structure-activity relationship of Bi-based multi-heterojunction photocatalytic materials.
作者
马心全
李喜宝
陈智
冯志军
黄军同
MA Xinquan;LI Xibao;CHEN Zhi;FENG Zhijun;HUANG Juntong(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2023年第1期62-70,I0002-I0004,共12页
Journal of Inorganic Materials
基金
国家自然科学基金(51962023)
江西省自然科学基金(20212BAB204045)。
