文献类型：期刊文献

英文题名：Work-function-driven built-in electric field in flame-synthesized BiVO4 QDs/TiO2 composites: A high-efficiency photoelectrocatalytic platform for continuous flow degradation of tetracycline in wastewater

作者：Li, Chenchen[1];Wu, Mudi[2];Lei, Jing[1];Wan, Xinyi[1];Ma, Jingjing[1];Jiang, Hao[1];Hu, Yanjie[1,3];Li, Chunzhong[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Sch Mat Sci & Engn, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Nanyang Technol Univ, Sch Chem Chem Engn & Biotechnol, Singapore 637459, Singapore;[3]Shanghai Environm Friendly Mat Tech Serv Platform, Shanghai, Peoples R China

年份：2025

卷号：13

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：;EI(收录号：20253719126743);WOS:【SCI-EXPANDED(收录号:WOS:001582644300018)】；

基金：This work was supported by the National Natural Science Foundation of China (22378128, 22108079, U22B20143, U22A20429) , the Science and Technology Commission of Shanghai Municipality (22dz1205900) , the Key-Area Research and Development Program of Guangdong Prov-ince (2023B0101200007) , the Shanghai Municipal Science and Tech-nology Major Project, and the Fundamental Research Funds for the Central Universities. Additional support was provided by the Feringa Nobel Prize Scientist Joint Research Center.

语种：英文

外文关键词：Flame spray pyrolysis; Photoelectrocatalytic; BiVO4/TiO2; Charge transfer; Tetracycline degradation

摘要：To address the pressing issue of antibiotic pollution, this study presents a novel work-function-engineered BiVO4 quantum dot (QD)/TiO2 composite synthesized via flame spray pyrolysis (FSP). The FSP technique enables precise control over the BiVO4 QD size (<5 nm) and promotes spontaneous formation of tight heterojunctions through ultrafast quenching and high-temperature processing. A substantial work function difference between BiVO4 and TiO2 generates a robust built-in electric field, achieving 99.6 % charge separation efficiency through directional charge transfer. The optimized BiVO4/TiO2-3 catalyst exhibits superior photoelectrocatalytic (PEC) performance, achieving 99.5 % tetracycline (TC) degradation within 50 min (k(PEC) = 0.072 min(-1)), surpassing the combined performance of standalone photocatalysis (k(PC) = 0.020 min(-1)) and electrocatalysis (k(EC) = 0.004 min(-1)). A custom-designed continuous-flow PEC system demonstrates stable operation under realistic wastewater conditions, maintaining > 60 % TC removal efficiency in the presence of interfering ions and organics. Density functional theory (DFT) calculations and UPS/XPS analysis confirm that the interfacial electric field arises from the work function gradient, facilitating charge separation and suppressing recombination. Electron spin resonance (ESR) and LC-MS analyses reveal that reactive oxygen species (OH, O-2(-)) and key degradation pathways, such as quinonization, demethylation, and ring opening, together contribute to reduced ecotoxicity. This work provides a scalable PEC strategy that integrates quantum confinement and heterojunction engineering, offering new insights for the design of efficient water treatment materials.