摘要
采用一锅水热法制备了片层花簇状Bi_(2)MoO_(6)/Bi_(2)WO_(6)复合物,并以其为载体,将Ag_(3)PO_(4)通过原位生长的方式沉积在其表面,设计出一种新型的Bi_(2)MoO_(6)/Bi_(2)WO_(6)/Ag_(3)PO_(4)复合双Z-scheme型结构的光催化剂,考察了复合催化剂在可见光下降解罗丹明B(RhB)的催化活性。研究表明,当Ag_(3)PO_(4)在复合物中的质量分数为5%时,复合催化剂在可见光下具有最佳的光催化活性,在120 min内对RhB的降解率高达99.15%。Bi_(2)MoO_(6)、Bi_(2)WO_(6)和Ag_(3)PO_(4)三者的协同作用有效提高了对可见光的吸收能力,所构建的双Z型异质结可改变光生电子的传输路径,进而促使光生电子空穴的分离,从而获得显著的光催化活性。根据捕获实验和能带理论分析,提出了一种双Z-scheme型光催化剂的作用机理。
Layered Bi_(2)MoO_(6)/Bi_(2)WO_(6)composites were prepared by a one pot hydrothermal method and Ag_(3)PO_(4)was deposited on its surface through in-situ growth with it as a supporter.A new type of Bi_(2)MoO_(6)/Bi_(2)WO_(6)/Ag_(3)PO_(4)compos⁃ite dual Z-scheme heterojunction photocatalyst was designed.The catalytic activity of the composite catalyst for the degradation of RhB under visible light was investigated.Experiments showed that when the mass fraction of Ag_(3)PO_(4)in the complex was 5%,the composite catalysts exhibited optimal photocatalytic activity under visible light,with a degradation rate of 99.15%for RhB within 120 minutes.The synergistic effect of Bi_(2)MoO_(6),Bi_(2)WO_(6),and Ag_(3)PO_(4)ef⁃fectively improved the absorption ability of visible light.The constructed double Z-scheme heterojunction could change the transmission path strength of photo generated electrons,which promoting the separation of photo gener⁃ated electron holes.As a result,significant photocatalytic activity was obtained.Based on capture experiments and band theory analysis,a dual Z-scheme photocatalytic mechanism was proposed.
作者
董玮
林莉
顾怀章
罗云强
马平
李向阳
DONG Wei;LIN Li;GU Huaizhang;LUO Yunqiang;MA Ping;LI Xiangyang(School of Science,Kaili University,Kaili 556011,China;Key Laboratory of Advanced Functional Materials,Kaili University,Kaili 556011,China;School of Life and Health Science,Kaili University,Kaili 556011,China)
出处
《工业水处理》
CAS
CSCD
北大核心
2024年第8期81-89,共9页
Industrial Water Treatment
基金
国家自然科学基金项目地区基金项目(21966015)
贵州省教育厅青年人才项目(黔教合KY字[2020]185)。
