摘要
利用水热法和超声辅助沉淀法制备了Z型异质结WO_(2)/Ag_(3)VO_(4)复合光催化剂。采用多种表征手段对其晶体结构、形貌和性能进行了表征,并以盐酸四环素(TCH)为降解对象考察了WO_(2)/Ag_(3)VO_(4)复合催化剂的光催化活性。结果表明:简单斜方的WO_(2)负载在单斜相的Ag_(3)VO_(4)表面,形成Z型异质结结构,这种结构以及Ag_(3)VO_(4)光腐蚀产生的Ag0,能加速无效电子-空穴对的复合,促进有效光生载流子的分离,提升WO_(2)/Ag_(3)VO_(4)复合催化剂的可见光催化活性;WO_(2)/Ag_(3)VO_(4)复合催化剂对TCH的降解效果明显优于纯WO_(2)和Ag_(3)VO_(4),其中5 wt%WO_(2)/Ag_(3)VO_(4)的效果最好,可见光下3 h对TCH的降解率可达85.8%,且降解过程符合一级动力学反应模型。
The Z-scheme heterojunction WO_(2)/Ag_(3)VO_(4)composite photocatalyst was prepared by hydrothermal and ultrasonic assisted precipitation methods.Various characterization techniques were employed to analyze its crystal structure,morphology,and performance.The photocatalytic activity of the WO_(2)/Ag_(3)VO_(4)composite catalyst was evaluated using tetracycline hydrochloride(TCH)as the degradation target.The results revealed that simple orthorhombic WO_(2)was deposited onto the surface of monoclinic Ag_(3)VO_(4),creating a Z-scheme heterojunction structure.This structure and the Ag0 generated by the photocorrosion of Ag_(3)VO_(4)accelerated the recombination of ineffective electron-hole pairs,promoted the separation of effective photogenerated carriers,and enhanced the visible light catalytic activity of the WO_(2)/Ag_(3)VO_(4)composite catalyst.The degradation effect of the catalyst on TCH was noticeably superior to that of pure WO_(2)and Ag_(3)VO_(4),with 5 wt%WO_(2)/Ag_(3)VO_(4)having the best performance,achieving a degradation rate of 85.8%for TCH under visible light for 3 hours.The degradation process conformed to the first-order kinetic reaction model.
作者
叶红勇
杜佳
刘月
王弈帆
韦怡羽
左广玲
YE Hong-yong;DU Jia;LIU Yue;WANG Yi-fan;WEI Yi-yu;ZUO Guang-ling(School of Biological and Chemical Engineering,Nanyang Institute of Technology,Nanyang 473000,China;Henan Key Laboratory of Industrial Microbial Resources and Fermentation Technology,Nanyang 473000,China)
出处
《中国陶瓷》
CAS
CSCD
北大核心
2024年第8期13-23,共11页
China Ceramics
基金
国家自然科学基金(22201146)。
