BiVO4/CoPc S型异质结的构建及其光热增强光催化性能
Construction of BiVO4/CoPc S-scheme heterojunctions with enhanced photothermal-assisted photocatalytic activity
龙子洋 1郑相阳 1史海峰2
作者信息
- 1. School of Science,Jiangnan University,Wuxi 214122,China
- 2. School of Science,Jiangnan University,Wuxi 214122,China;National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093,China
- 折叠
摘要
光热催化降解去除污染物对解决环境问题具有独特的优势.本文通过水热法结合超声处理的方法合成了BiVO4/CoPc S型异质结光热催化材料.实验结果表明,BVO-1％CoPc在10分钟内对四环素对降解率可达76％,相比钒酸铋单质提高了1.8倍.进一步的红外热成像仪表明酞菁钴(CoPc)的光热效应可以提高反应体系的温度.同时,研究人员还发现降解后的中间产物毒性显著降低.光致发光光谱的结果表明,合成的复合材料可以增强光生载流子的分离能力.基于捕获实验、能带结构和原位XPS等研究结果,我们提出了光生电荷在合成的催化剂中的S型传输机制.本工作为设计和开发用于去除有机污染物的S型光热催化材料提供了一种可行的策略.
Abstract
Photothermal-assisted photocatalytic degrada-tion of antibiotics is a promising way to alleviate pollutant issues in the environment.Herein,a BiVO4(BVO)-cobalt phthalocyanine(CoPc)S-scheme heterojunction was con-structed by coupling the solvothermal method with sonica-tion,which can facilitate photothermal-assisted photocatalytic tetracycline(TC)removal.The BVO-1％CoPc sample ex-hibited optimal TC removal efficiency,reaching 76％within 10 min;its apparent rate constant was 1.8 times that of pure BVO.Additionally,BVO-1％CoPc exhibited excellent reusa-bility and stability in cycling experiments.Photoluminescence measurements demonstrated that the S-scheme heterojunc-tion structure improved the charge separation efficiency.In-frared thermography images showed that the increased temperatures of the reaction system can be attributed to the photothermal effect of CoPc.The degradation intermediates and possible degradation pathways of TC were analyzed.Based on active species trapping experiments,in situ X-ray photoelectron spectrometry,and band structures,a possible S-scheme photocatalytic charge transfer mechanism for BVO-CoPc was reasonably proposed.This study provides a feasible strategy to construct an S-scheme heterojunction system with photothermal assistance for the practical removal of organic pollutants.
关键词
BiVO4/CoPc/photothermal effect/S-scheme het-erojunction/tetracyclineKey words
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基金项目
National Natural Science Foundation of China(22172064)
National Laboratory of Solid State Microstructures,Nanjing University(M34047)
Qing Lan Project of Jiangsu Province()
出版年
2024
NETL
NSTL
万方数据