硫氮共掺杂碳量子点荧光识别Pb^(2+)  

Fluorescent recognition of lead(Ⅱ) ions with the sulfur-and nitrogen-co-doped carbon quantum dots

作　　者：丁志杰[1] 魏居孟 郭雨[1] 郭腾[1] 周永生[1] 陈君华[1] 张雪梅[1] DING Zhi-jie;WEI Ju-meng;GUO Yu;GUO Teng;ZHOU Yong-sheng;CHEN Jun-hua;ZHANG Xue-mei(College of Chemistry and Materials Engineering,Anhui Science and Technology University,Fengyang 233100)

机构地区：[1]安徽科技学院化学与工程学院,凤阳233100

出　　处：《分析试验室》2018年第9期1045-1048,共4页Chinese Journal of Analysis Laboratory

基　　金：安徽省教育厅重点项目(KJ2017A507);安徽科技学院重点学科建设项目(AKZDXK/2015A01)资助

摘　　要：以L-半胱氨酸为碳源、硫源及氮源,一步水热法制得水溶性好、稳定性高的硫氮共掺杂碳量子点SN-CDs。基于Pb2+对其荧光的淬灭作用,构建了高选择性与高敏感度的荧光探针,可应用于Pb2+的快速检测。运用透射电镜、紫外-可见吸收光谱、Fourier红外光谱和荧光光谱表征了SN-CDs的结构及光学性能。结果表明,Pb2+浓度在2~50μmol/L范围内,与SN-CDs的荧光淬灭率之间呈良好的线性关系,相关系数为0.9992,检出限为0.2μmol/L。方法用于自来水中Pb2+的测定,回收率为94.7%~100.7%。Using L-cysteine as carbon, nitrogen and sulfur source, the sulfur and nitrogen co-doped carbon dots SN-CDs with excellent water-soluble and stable property were synthesized by one-step hydrothermal method. Based on the fluorescence quenching effect of lead （Ⅱ） on SN-CDs, a fluorescent method with high selectivity and sensitivity was established. It was used to quickly determine the amount for lead （Ⅱ） ions. The structure and luminescence properties of SN-CDs were characterized by TEM, ultraviolet-visible absorption, Fourier transform infrared spectroscopy and fluorescence spectrum. The results showed that the fluorescence quenching rate had a linear response to lead（Ⅱ） in the concentration range of 2 to 50μmol/L, with a correlation coefficient of 0. 9992 and a detection limit of 0.2 μmol/L. The method was used for determining lead （Ⅱ） in the tap water samples,and the recovery was 94.7%~100.7%.

关 键 词：碳量子点 荧光淬灭 铅离子 L-半胱氨酸 水热法 

分 类 号：X132[环境科学与工程—环境科学] O655.29[理学—分析化学]