Ag/g-C3N4复合材料可见光高效催化降解盐酸多西环素体系的构建
Construction of Ag/g-C3N4 photocatalyst-visible light photocatalytic degradation system for doxycycline hydrochloride
刘玉娇 1王霞 1许明洋 1符袅 1王绍仙 1何洁丽1
作者信息
- 1. 云南省昆虫生物医药研发重点实验室,大理大学药学院,云南 大理 671000
- 折叠
摘要
以三聚氰胺和硝酸银为前驱体制备了不同银负载量的氮化碳复合材料,通过TEM、XRD、UV-Vis、XPS、PL等技术对催化剂进行表征,结果表明,银的引入改变了氮化碳的结构和性质.以盐酸多西环素为污染物,考察了不同负载质量分数的Ag/g-C3N4 的光催化性能,结果表明,5.0%的Ag/g-C3N4 对盐酸多西环素具有最佳的降解性能,在可见光下,Ag/g-C3N4 在40 min内去除了85%的盐酸多西环素(20.00 mg/L).与g-C3N4[k=0.172 L/(mol·min)]相比,Ag/g-C3N4 体系[k=4.42 L/(mol·min)]的降解速率常数提高了 25.7 倍.化学捕获实验表明,超氧自由基和空穴是主要的活性物种.
Abstract
Carbon nitride composite materials(Ag/g-C3N4)with different silver doping amount are prepared by using melamine and silver nitrate as precursors,and characterized by means of TEM,XRD,UV-Vis,XPS,PL,etc.It is verified by the results that the structure and properties of carbon nitride are changed after silver doping.Taking doxycycline hydrochloride as a pollutant,the photocatalytic performance of Ag/g-C3N4 with different loading mass fraction is evaluated.It is found that 5.0%Ag/g-C3N4 shows the optimal degradation performance to doxycycline hydrochloride.Under visible light,85%of doxycycline hydrochloride(20.00 mg·L-1)has been removed by Ag/g-C3N4 in 40 min.The degradation rate constant of Ag/g-C3N4 system reaches 4.42 L·mol-1·min-1,which is 25.7 times that of g-C3N4(0.172 L·mol-1·min-1).It is verified by chemical capture experiment that superoxide radicals and holes are the main active species.
关键词
Ag/g-C3N4/盐酸多西环素/光催化降解/反应机理Key words
Ag/g-C3N4/doxycycline hydrochloride/photocatalytic degradation/reaction mechanism引用本文复制引用
基金项目
国家自然科学基金地区基金(22162002)
出版年
2024
NETL
NSTL
万方数据