摘要
以柠檬酸为碳源、磷酸氢二铵为氮源和磷源,采用微波加热法成功合成了氮磷共掺杂碳点(NPCDs),利用透射电子显微镜(TEM)、X射线光电子能谱分析(XPS)、X射线衍射能谱(XRD)、傅利叶红外吸收光谱(FT-IR)、紫外吸收光谱和荧光光谱等手段对氮磷共掺杂碳点的结构进行了表征,量子产率为33%。随着汞离子(Hg^(2+))浓度的增加,NPCDs的荧光被逐渐猝灭,基于此构建了检测汞离子的NPCDs荧光探针。探讨了氮磷共掺杂碳点的浓度、溶液pH值和反应时间对NPCDs–Hg^(2+)系荧光强度的影响。在优化的实验条件下,汞离子浓度在0.1μM～30.0μM范围内与NPCDs的相对荧光强度呈良好的线性关系,检出限为9.9 nM。同时初步探讨了Hg^(2+)使NPCDs荧光猝灭的机理。将构建的NPCDs荧光探针应用于环境水样中汞离子的检测,结果满意。
we use citric acid monohydrate and diammonium hydrogen phosphate as the carbon and nitrogen nutrient sources to synthesize nitrogen and phosphorus co-doped carbon dots(NPCDs)by microwave heating method.The as-prepared NPCDs were characterized by multiple analytical techniques such as TEM,FT-IR,UV-vis absorption and fluorescence spectra and the quantum yield is 33%.The fluorescence intensity of the NPCDs was efficiently quenched by mercury ion(Hg2+),which a sensitive fluorescent probe for the determination of Hg2+ was developed.The effects of concentration of NPCDs,pH of buffer solution and reaction time on the fluorescence intensity of NPCDs-Hg2+ system were examined.The possible reaction mechanisms between Hg2+ and NPCDs were primarily studied.Furthermore,the as-constructed fluorescent probe was successfully applied to the analyses of Hg2+in environmental water samples with satisfactory results.
作者
王宁
王新旭
杨海芬
宋文静
孙体健
WANG Ning;WANG Xin-xv;YANG Hai-fen;SONG Wen-jing;SUN Ti-jian(School of Basic Medical Science,Shanxi Medical University,Taiyuan 030001,china;Shanxi Experimental Secondary School,Taiyuan 030001,china)
出处
《化学研究与应用》
CAS
CSCD
北大核心
2019年第3期440-448,共9页
Chemical Research and Application
基金
山西省自然科学基金项目(2015011024)资助
关键词
氮磷共掺杂碳点
荧光探针
汞离子
nitrogen and phosphorus co-doped carbon dots
fluorescent probe
mercury ion
作者简介
通讯作者:孙体健(1960-),女,教授,主要从事生物无机配合物和天然产物生物活性成分研究。E-mail:suntijian@163.com。
