文献类型：期刊文献

中文题名：MoO3/TiO2纳米管的制备及其光催化降解多环芳烃的机制

英文题名：Preparation of MoO3/TiO2 nanotubes and the mechanism study for the photocatalytic degradation of PAHs

作者：宋友桂[1];何伟煜[1];孙贤波[1];蔡正清[1]

机构：[1]华东理工大学高浓度难降解有机废水处理技术国家工程实验室,上海200237

年份：2020

卷号：39

期号：3

起止页码：624

中文期刊名：环境化学

外文期刊名：Environmental Chemistry

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD2019_2020】；

基金：国家自然科学基金(41807340)资助

语种：中文

中文关键词：MoO3;TiO2;MoO3/TiO2纳米管;芘;光催化

外文关键词：MoO3;TiO2;MoO3/TiO2 nanotubes;pyrene;photocatalytic

摘要：本研究将热分解法制备的MoO3与水热法制备的TiO2纳米管复合,得到具有高太阳光催化活性的MoO3/TiO2纳米管异质结催化剂.研究中以芘为模型多环芳烃(polycyclic aromatic hydrocarbons,PAHs),探究了MoO3/TiO2纳米管模拟在太阳光下催化降解PAHs的效果及效率提升的机制.结果表明,MoO3和TiO2纳米管间形成的p-n异质结结构,降低了材料的能带间隙而获得更高的可见光利用效率,并有效促进了电子和空穴的分离,从而提高了复合材料的光催化活性.1%MoO3/TiO2纳米管催化降解芘速率(k)较MoO3和TiO2(锐钛矿)分别提升了5.3倍和1.5倍.催化体系中产生的·OH和光生空穴在芘的降解中起主要作用.
In this study,a highly solar active MoO3/TiO2 nanotubes catalyst was prepared by calcining the solid-state decomposition derived MoO3 and hydrothermal synthesized TiO2 nanotubes.Using pyrene as a model PAH,the photocatalytic activity of MoO3/TiO2 nanotubes was evaluated under solar light irradiation,and the mechanism of improved photocatalytic activity was investigated by experiments and material characterizations.The results showed that the p-n heterojunction formed between MoO3 and TiO2,which reduced the band gap energy of TiO2,and the photocatalytic activity of the composite was improved via obtaining higher visible light utilization efficiency and promoting electron-hole pairs separation.The degradation rate(k)of pyrene by 1%MoO3/TiO2 nanotubes was 5.3 times and 1.5 times of MoO3 and TiO2(anatase),respectively.Moreover,the·OH and holes were found to play major roles in the photodegradation of pyrene.