摘要
使用一种简单的搅拌焙烧方法成功制备了MoO3/g-C3N4复合材料,通过SEM、TEM、XRD、FTIR、UV-vis和PL等技术对材料进行形貌结构和光学性能的表征.结果表明,MoO3与g-C3N4成功复合,使g-C3N4吸收发生红移,扩大了g-C3N4的可见光吸收范围,有效地抑制了光生载流子的复合.以非甾体抗炎药萘普生(NPX)为目标污染物,对MoO3/g-C3N4复合材料的光催化性能进行研究,实验表明光催化剂MoO3/g-C3N4对萘普生的去除率是相同条件下纯g-C3N4的1.75倍.MoO3负载量、pH值、催化剂MoO3/g-C3N4的使用量和NPX的初始浓度等因素的研究表明,3%的MoO3复合量和酸性条件更有利于NPX降解,加大MoO3/g-C3N4的使用量和减少NPX的初始浓度也能加快NPX的降解速率.通过猝灭实验确定了单线态氧和超氧自由基是反应的主要活性物种,ESR测定单线态氧的存在验证了Z型MoO3/g-C3N4降解NPX的机制.
In this study,MoO3/g-C3N4 photocatalysts were successfully synthesized through a simple calcination method.The morphologies,chemical compositions,and optical properties of the prepared catalysts were investigated via a series of characterization techniques,including SEM,TEM,XRD,FT-IR,UV-Vis and PL spectra.The results showed that MoO3 was successfully combined with g-C3N4,resulting in a red shift of the absorption of g-C3N4 and hence expanded absorption range of g-C3N4.The combination of MoO3 also reduced the recombination rate of photo-induced charge carriers in g-C3N4.Naproxen (NPX),a nonsteroidal anti-inflammatory drug,was used as a target pollutant to systematically evaluate the photocatalytic activity of MoO3/g-C3N4.Results showed that the photocatalytic degradation efficiency of NPX by MoO3/g-C3N4 was 1.75 times higher than that by pure g-C3N4 under the same experimental conditions.In addition,the effects of the loading amount of MoO3,pH,the dose of MoO3/g-C3N4 photocatalyst,and the initial concentration of NPX were also investigated.Results demonstrated that NPX was degraded rapidly with 3%wt of MoO3 under acidic condition.The degradation rate of NPX was also improved by increasing MoO3/g-C3N4 dosage,as well as reducing the initial concentration of NPX.The critical reactive oxygen species (ROS) were identified by the scavenging experiment,and results revealed that singlet oxygen (1O2) and superoxide anion radical (O2·-) were responsible for the degradation of NPX.The degradation mechanism of NPX by the Z-scheme MoO3/g-C3N4 photocatalyst was also supported by the detedtion of singlet oxygen in ESR analysis.
作者
谢治杰
冯义平
张钱新
曾泳钦
王枫亮
刘国光
吕文英
颜幼平
XIE Zhijie;FENG Yiping;ZHANG Qianxin;ZENG Yongqin;WANG Fengliang;LIU Guoguang;LV Wenying;YAN Youping(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou,510006,China)
出处
《环境化学》
CAS
CSCD
北大核心
2019年第8期1724-1734,共11页
Environmental Chemistry
基金
国家自然科学基金(21707019)
广东省自然科学基金(2017A050506052)资助~~
