pH响应红色荧光碳点的制备及对敌敌畏的检测  

Preparation of Red-Emission Carbon Dots with pH Response and Detection of Dichlorvos

作　　者：徐香[1] 王路瑶 孙钦星 李伟娜[1] XU Xiang;WANG Luyao;SUN Qinxing;LI Weina(College of Chemistry and Pharmaceutical Sciences,Qingdao Agricultural University,Qingdao 266109,China)

机构地区：[1]青岛农业大学化学与药学院,山东青岛266109

出　　处：《青岛农业大学学报（自然科学版）》2023年第4期293-299,共7页Journal of Qingdao Agricultural University(Natural Science)

基　　金：国家自然科学基金(41406090,42176045);青岛农业大学高层次人才基金(6631114305,6631113302,6631113338);福建省海洋传感功能材料重点实验室开放基金(MJUKF-FMSM202102);山东省高等学校青年创新团队人才引育计划。

摘　　要：以一水合柠檬酸和尿素为原料,采用一锅溶剂热法合成红色荧光碳点。红外光谱和X射线光电子能谱图观测结果表明,碳点表面富含-COOH、-OH、-NH_(2)等亲水性基团,具有良好的水溶性。通过不同酸碱环境中的荧光强度检测发现,碳点具有良好的pH响应特性:在酸性条件下发生荧光猝灭;在碱性条件下荧光发射相对稳定;在碱性—酸性条件循环变化时可以实现荧光“开—关”的稳定转换。基于这一特性,实现了有机磷农药敌敌畏的选择性检测,波长605 nm处的荧光强度与0.01~0.1 ng/mL的敌敌畏浓度呈良好的线性关系,最低检测限为2.22×10^(-8)mg/mL。With citric acid monohydrate and urea as raw materials,red-emission carbon dots(R-CDs)were synthesized by one-pot solvothermal method.FTIR and XPS results showed that the surface of carbon dots was rich in hydrophilic groups such as-COOH,-OH,and-NH_(2),featuring good water solubility.Through fluorescence intensity detection for R-CDs solutions with different pH,it was revealed that R-CDs had good pH response characteristics.The fluorescence of R-CDs was quenched in acidic environments,while could stably exist under alkaline conditions.In addition,stable fluorescence“on-off”switching could be achieved as the pH conditions changed cyclically.Based on such characteristics,selective detection of the organophosphorus pesticide dichlorvos had been successfully accomplished.The fluorescence intensity at 605 nm exhibited a good linear relationship with the dichlorvos concentrations ranging from 0.01 to 0.1 ng/mL,and a minimum detection limit of 2.22×10^(-8) mg/mL was obtained.

关 键 词：碳点 红色荧光 PH响应 有机磷农药 检测 

分 类 号：O648[理学—物理化学]