摘要
以邻苯二胺为氮源,硫脲为硫源,通过一步溶剂热法合成氮硫掺杂碳点(NS-CDs),其荧光量子产率为6.9%;加入Cu^(2+)后荧光量子产率跃升至45.6%,同时荧光从淡灰黄色变成强烈的亮黄色。基于该Off-On型荧光增强效应,建立了水中Cu^(2+)的荧光快速检测方法,线性范围为0.05~10.0μmol/L,检出限低至0.01μmol/L。应用于环境水体中Cu^(2+)检测,实际样品加标回收率在83.3%~115.7%之间,相对标准偏差(RSD)<7.0%。样品测定结果与ICP-MS法结果基本一致。结合便携LED光源,可实现环境水体中Cu^(2+)的现场快速监测。
Nitrogen and sulfur doped carbon dots(NS-CDs)were prepared by the one-step solvothermal synthesis method with o-phenylenediamine as nitrogen source and thiourea as sulfur source.The fluorescence quantum yield of NS-CDs was 6.9%.After adding Cu^(2+),the fluorescence quantum yield jumped to 45.6%,and the fluorescence changed from pale yellow to strong bright yellow.Based on the Off-On fluorescence-enhanced effect of NS-CDs,a new fluorescent method had been established for the rapid detection of Cu^(2+)in water in the linear range from 0.05 to 10.0μmol/L,with the detection limit as low as 0.01μmol/L.Furthermore,the results of NS-CDs applied for the detection of Cu^(2+)in environmental water were satisfied,with the spiked recoveries from 83.3%to 115.7%and the relative standard deviations(RSDs)less than 7.0%,which were basically consistent with those of ICP-MS method.The method can be applied for rapid on-site monitoring of Cu^(2+)in environmental water with the help of portable led light source.
作者
张晓淳
江晓君
霍志铭
ZHANG Xiaochun;JIANG Xiaojun;HUO Zhiming(Zhongshan Ecology and Environment Monitoring Station of Guangdong Province,Zhongshan 528400,China;School of Public Health,Guangdong Pharmaceutical University,Guangzhou 510006,China)
出处
《分析试验室》
EI
CAS
CSCD
北大核心
2024年第6期906-913,共8页
Chinese Journal of Analysis Laboratory
基金
中山市科技计划项目(2018C2004)资助。
关键词
氮硫掺杂碳点
荧光增强
Cu^(2+)
快速检测
nitrogen and sulfur doped carbon dots
fluorescent enhancement
copper ion
rapid detection
