Carbon quantum dots/BiVO_(4)S-scheme piezo-photocatalysts improved carrier separation for efficient antibiotic removal  

作　　者：Mingsong Lv Shihan Wang Haifeng Shi 

机构地区：[1]School of Science,Jiangnan University,Wuxi 214122,China [2]National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China

出　　处：《Journal of Materials Science & Technology》2024年第34期21-31,共11页材料科学技术(英文版)

基　　金：support of this work from the National Natural Science Foundation of China(No.22172064);the National Laboratory of Solid State Microstructures,Nanjing University(No.M34047);Prof.Haifeng Shi was indebted to the fi-nancial support from the Qing Lan Project of Jiangsu Province.

摘　　要：Reasonable design of an efficient S-scheme photocatalyst remains an ongoing challenge due to the limita-tion of interfacial charge separation efficiency.Herein,CQDs/BiVO_(4)S-scheme heterojunction with Bi-O-C bond was synthesized by introducing carbon quantum dots(CQDs)growth on BiVO_(4)piezo-photocatalyst and absorbed visible light up to 750 nm.Under light+ultrasonic conditions,the reaction rate con-stant(k)of BVO/C-0.10 reached 0.0517 min^(−1)on tetracycline(TC)degradation,which was 2.24 and 4.04 times higher than those of BiVO_(4)and CQDs,respectively.The enhanced performance was attributed to the improved efficiency of the photogenerated carrier separation,originating from the combination of piezoelectric effect and S-scheme heterojunction with Bi-O-C bond.The Bi-O-C bond at the CQDs(3-8 nm)and BiVO_(4)interfaces connected the two semiconductor materials and provided an atomic-level interface channel for carrier migration.The piezoelectric properties of the composites were investigated by piezo−response force microscopy(PFM).Based on Mott−Schottky curves,X-ray photoelectron spec-troscopy(XPS),and scavenging experiments,the possible piezo-photocatalytic mechanism was proposed in combination with the band structures and characteristics of CQDs and BiVO_(4).This work furnishes unique insights into developing efficient S-scheme piezo-photocatalysts for purifying wastewater.

关 键 词：Carbon quantum dots BiVO_(4) Piezo-photocatalysis S-scheme heterojunction TETRACYCLINE 

分 类 号：TB3[一般工业技术—材料科学与工程]