基于锰掺杂硫化锌/铕(Ⅲ)纳米复合材料检测环境水体中的氟离子  

Determination of Fluoride Ion in Environmental Water Based on Manganese-Doped Zinc Sulfide Quantum Dots/Europium (Ⅲ) Nanocomposites

作　　者：孙晓杰 苗艳明[1] 吕金枝[1] 罗士清 王瑞瑞 闫桂琴[1] SUN Xiao-Jie;MIAO Yan-Ming;LYU Jin-Zhi;LUO Shi-Qing;WANG Rui-Rui;YAN Gui-Qin(College of Life Science,Shanxi Normal University,Linfen 041004,China)

机构地区：[1]山西师范大学生命科学学院

出　　处：《分析化学》2019年第9期1366-1372,共7页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(No.31700862);山西省青年科技研究基金项目(No.201601D021109);山西师范大学研究生科技创新项目(No.2017SCX039)资助~~

摘　　要：设计并构建了利用锰掺杂硫化锌量子点(Mn-ZnS QDs)的室温磷光(RTP)特性检测氟离子(F^-)的光学传感体系。在此体系中,铕离子(Eu^3+)与Mn-ZnS QDs结合形成纳米复合材料,QDs相互靠近发生的能量转移使室温磷光猝灭。在上述体系中加入F^-后,F^-与Eu^3+强的配位竞争瓦解了聚集态的QDs,磷光逐渐恢复,根据不同浓度F^-下磷光恢复程度,实现F^-的痕量测定。本方法基于磷光传感方式,避免了复杂环境基质中背景荧光和散射光的干扰,操作简便,灵敏度高。本方法检出限为0.05 mg/L,线性范围为0.2~20.0 mg/L,环境水样中F^-加标回收率为94%~106%。本研究为环境水体中F^-的高效检测提供了方法。An optical sensing system for specific detection of F^-was developed on the basis of room-temperature phosphorescence of manganese-doped Zinc sulfide quantum dots(Mn-ZnS QDs).In this system,Eu^3+ bonded with Mn-ZnS QDs to form nanocomposites,and the energy transfer due to the approach of QDs quenched the room-temperature phosphorescence.In the presence of F^-,the stong coordinative competition between F^-and Eu^3+ collapsed the aggregation-state of QDs and thereby gradually recovered the phosphorescence,which contributed to the trace F^-detection.This method based on phosphorescence sensing avoids the interference from background fluorescence and scattering light in complex environmental substrate and is featured with high convenience and sensitivity.This method had a detection limit of 0.05 mg/L,a linear range of 0.2-20.0 mg/L,and a relative standard deviation of 3.2%in determination of F^-.The spiked recovery of F^-in environmental water samples was 94%-106%.This study offers an efficient method for F^-detection in environmental water bodies.

关 键 词：磷光量子点 能量转移 铕离子 氟离子 

分 类 号：TB3[一般工业技术—材料科学与工程]