玉米苞衣热解法制备碳点及荧光猝灭法测定Hg^(2+)  

Preparation of carbon dots by pyrolysis of maize bract and determination of Hg^(2+)by fluorescence quenching method

作　　者：王越 刘根起[1] 刘建勋 王刚[1] 赵伶俐 刘莉莎 孙辰昕 马晓燕[1] WANG Yue;LIU Genqi;LIU Jianxun;WANG Gang;ZHAO Lingli;LIU Lisha;SUN Chenxin;MA Xiaoyan(School of Chemistry and Chemical Engineering,Northwestern Polytechnical University,Xi'an 710129,China)

机构地区：[1]西北工业大学化学与化工学院,西安710129

出　　处：《分析试验室》2024年第3期322-327,共6页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金项目(52273255);陕西省自然科学基础研究计划项目(2017JM5049);西北工业大学《分析化学》教学团队建设和《分析化学实验》在线开放课程教学改革项目资助。

摘　　要：以农业废弃物玉米苞衣为碳源,采用一步热解法制备荧光碳点(CDs),利用透射电子显微镜、红外光谱、X射线光电子能谱、紫外-可见光谱和荧光光谱等对CDs的结构和光学性能进行了表征。结果表明,制备得到的CDs呈球形,粒径约为5.5 nm,其表面富含羟基和羧基。CDs在紫外光照射下可以发出明亮的蓝色荧光。Hg^(2+)对CDs溶液的荧光具有显著的猝灭作用,据此建立了检测Hg^(2+)的新体系。在0~4.0μmol/L范围内,CDs溶液的荧光猝灭程度与Hg^(2+)浓度呈良好的线性关系,检出限为0.011μmol/L。本方法适用于自来水和湖水水样中Hg^(2+)的测定。The fluorescent carbon dots(CDs)were prepared by one-step pyrolysis from agricultural waste maize bract.The structure and optical properties of the CDs were characterized by transmission electron microscopy,Fourier transform infrared,X-ray photoelectron spectroscopy,ultraviolet-visible spectrscopy and fluorescence spectroscopy.The results showed that the prepared CDs were spherical in shape with a particle size of about 5.5 nm,and their surface were rich in hydroxyl and carboxyl groups.CDs can emit bright blue fluorescence when exposed to ultraviolet light,and Hg^(2+)had a significant quenching effect on the fluorescence of CDs solution.Thus,a new method for detecting Hg^(2+)was established.In the range of 0-4.0μmol/L,the fluorescence quenching degree of CDs solution showed a good linear relationship with the concentration of Hg^(2+),and the detection limit was 0.011μmol/L.The proposed method can be used for the determination of Hg^(2+)in tap water and lake water samples.

关 键 词：玉米苞衣 碳点 热解法 汞离子 荧光猝灭法 

分 类 号：O657.3[理学—分析化学]