摘要
采用微波溶剂热法—浸渍法制备了WO3/γ-Bi2Mo O6纳米异质结复合可见光催化剂(简称光催化剂),用XRD、SEM、XPS和UV-Vis分光光度法对其进行了表征。以甲基橙为目标降解物,考察了光催化剂的催化性能。表征结果显示:WO3分散在γ-Bi2Mo O6晶体表面,未进入晶格内部;与WO3和γ-Bi2Mo O6相比,WO3/γ-Bi2Mo O6在紫外和可见光区的吸收强度均有所提高,且对光的吸收发生了明显的红移,禁带宽度变窄;二者形成的p-n型异质结能及时有效地促进光生电子-空穴对的分离,提高催化活性。实验结果表明:WO3/γ-Bi2Mo O6的催化活性优于WO3和γ-Bi2Mo O6;在甲基橙溶液初始质量浓度为10 mg/L、光催化剂WO3(1.0%)/γ-Bi2Mo O6加入量为1 g/L时,反应3 h时甲基橙的降解率最高(达97.48%),甲基橙溶液中TOC的去除率也最高(为92.0%)。
The composite visible-light responsive photocatalyst,WO3/γ-Bi2MoO6 heterojunction,was prepard by microwave solvothermal technique and impregnation method,and characterized by XRD,SEM,XPS and UV-Vis spectrophotometry.Its photocatalytic activity was investigated using methyl orange as target degradation material.The characterization results show that：WO3 disperses on the surface of γ-Bi2MoO6 crystal,instead of into the crystal lattice;Compared with WO3 and γ-Bi2MoO6,both of UV-and Vis-absorption intensities of WO3/γ-Bi2MoO6 are improved,the spectrum migrates toward red and the band gap is narrowed;The p-n type heterojunction formed by WO3 and γ-Bi2MoO6 can effectively promote the separation of photo-induced electron-hole pair and increase the visible-light photocatalytic activity.The experimental results show that：The photocatalytic activity of WO3/γγ-Bi2MoO6 is much better than those of WO3 and γ-Bi2MoO6;When the initial mass concentration of the methyl orange solution is 10 mg/L,the dosage of WO3 （1.0％）/γ-Bi2MoO6 is 1 g/L and the reaction time is 3 h,the degradation rates of methyl orange and TOC are the highest （97.48％ and 92.0％ respectively）.
出处
《化工环保》
CAS
CSCD
北大核心
2015年第3期312-317,共6页
Environmental Protection of Chemical Industry
基金
河南省科技厅重点科技攻关项目(142102210026)
关键词
氧化钨
γ-钼酸铋
异质结
复合光催化剂
甲基橙
tungsten oxide
γ-bismuth molybdate
heterojunction
composite photocatalyst
methyl orange
