基于N掺杂Ti_(3)C_(2)MXene量子点的荧光探针用于Hg2+和S2-的传感检测  

Fluorescent Probe for Detection of Hg^(2+) and S2−Based on N-Doped Ti_(3)C_(2) MXene Quantum Dots

作　　者：张慧莲 杨新杰 李军 李泉 张福娟 张艳丽[1] 王红斌[1] 杨文荣 庞鹏飞[1] ZHANG Huilian;YANG Xinjie;LI Jun;LI Quan;ZHANG Fujuan;ZHANG Yanli;WANG Hongbin;YANG Wenrong;PANG Pengfei(Functional Nanomaterial-based Chemical and Biological Sensing Technology Innovation Team of Department of Education of Yunnan Province,Yunnan Minzu University,Kunming 650504,China;School of Life and Environmental Sciences,Deakin University,Geelong 3217,Australia)

机构地区：[1]云南民族大学,云南省教育厅功能纳米材料基化学生物传感科技创新团队,昆明650504 [2]迪肯大学生命与环境科学学院,吉朗3217,澳大利亚

出　　处：《高等学校化学学报》2024年第5期38-45,共8页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21565031,21665027);云南省科技厅应用基础研究基金项目(批准号:202001AT070012);云南民族大学研究生科研创新基金项目(批准号:2023SKY028)资助.

摘　　要：基于N掺杂Ti_(3)C_(2) MXene量子点(N-Ti_(3)C_(2) MQDs)荧光探针和配位相互作用,构建了一种检测Hg^(2+)和S^(2-)的“开-关-开”型荧光传感新方法.研究发现,制备的N-Ti_(3)C_(2) MQDs发射蓝色荧光(λem=440 nm),荧光量子产率为15.7%.Hg^(2+)与N-Ti_(3)C_(2) MQDs表面的—NH2,—COOH,—OH等官能团产生选择性配位作用,导致N-Ti_(3)C_(2) MQDs体系荧光猝灭.当加入S^(2-)后,由于S^(2-)与Hg^(2+)之间强的结合力,形成HgS沉淀,从而使N-Ti_(3)C_(2) MQDs体系荧光恢复.基于该原理,构建了一种“开-关-开”型荧光传感方法,实现了对Hg^(2+)和S^(2-)的定量检测.N-Ti_(3)C_(2) MQDs探针的荧光强度与Hg^(2+)浓度在0.02~200μmol/L范围内呈良好线性关系,检出限为10 nmol/L(S/N=3);与S^(2-)浓度在0.07~150μmol/L范围内呈良好线性关系,检出限为30 nmol/L(S/N=3).该方法具有成本低、操作简单、灵敏度高和选择性好等特点,并可用于水样中Hg^(2+)和S^(2-)的检测.A novel fluorescent"on-off-on"method for the detection of Hg^(2+)and S^(2-)was developed based on N-doped Ti_(3)C_(2) MXene quantum dots(N-Ti_(3)C_(2) MQDs)and complexation.The prepared N-Ti_(3)C_(2) MQDs emitted blue fluorescence(λem=440 nm)with a fluorescence quantum yield of 15.7%.Hg^(2+)can selectively coordinate with functional groups of—NH2,—COOH,and—OH on the surface of N-Ti_(3)C_(2) MQDs through electrostatic interaction,resulting in fluorescent quenching of the N-Ti_(3)C_(2) MQDs system.After the addition of S^(2-),HgS precipitation is formed due to the strong binding force between S^(2-)and Hg^(2+),leading to the fluorescent recovery of the N-Ti_(3)C_(2) MQDs.Based on this principle,a fluorescent"on-off-on"sensing method was constructed to quantitatively detect Hg^(2+)and S^(2-).The fluores-centy of the N-Ti_(3)C_(2) MQDs probe is proportional to Hg^(2+)and S^(2-)concentrations in the range of 0.02—200μmol/L and 0.07—150μmol/L,with a detection limit of 10 nmol/L and 30 nmol/L(S/N=3),respectively.This proposed method has the advantages of low cost,simple operation,high sensitivity,and good selectivity,which has been used for the determination of Hg^(2+)and S^(2-)in real water samples.

关 键 词：汞离子 硫离子 N掺杂Ti_(3)C_(2)MXene 量子点 荧光探针 

分 类 号：O657.1[理学—分析化学]