氨基葡萄糖盐酸盐碳源荧光碳量子点的合成及其在汞(Ⅱ)检测中的应用  

Synthesis of fluorescence carbon quantum dots with glucosamine hydrochloride as carbon source and its application in determination of mercury(Ⅱ)

作　　者：郭颖[1] 李午戊[1] 刘洋[1] GUO Ying;LI Wu-wu;LIU Yang(College of Chemistry&Chemical Engineering,Xianyang Normal University,Xianyang 712000,China)

机构地区：[1]咸阳师范学院化学与化工学院,陕西咸阳712000

出　　处：《冶金分析》2018年第3期70-74,共5页Metallurgical Analysis

基　　金：陕西省教育厅科学研究计划项目(16JK1822);咸阳师范学院专项科研基金项目(15XSYK038)

摘　　要：以氨基葡萄糖盐酸盐为碳源,三聚磷酸钠为催化剂通过水热法合成了水溶性的荧光碳量子点(简称碳点)。研究了水热反应温度、催化剂用量以及溶液pH值对碳点荧光性能的影响。结果表明,在水热反应温度为180℃下反应10h,催化剂用量为0.938mmol条件下制备的碳点有最高的荧光量子产率(荧光量子产率为12%)。此外,基于Hg2+对碳点荧光强度明显的猝灭作用构建了一种检测Hg2+的新方法。Hg2+浓度在1.6×10-6~5.1×10-5 mol/L范围内与碳点的荧光猝灭程度呈良好的线性关系,方法检出限为6.7×10-7 mol/L。实验方法用于实验室废水和生活污水样品中Hg2+的测定,结果的相对标准偏差(RSD,n=6)为3.0%~4.0%,回收率为95%~107%。The water-soluble fluorescent carbon quantum dots(abbreviated as carbon dots)were synthesized by hydrothermal method with glucosamine hydrochloride as carbon source and sodium tripolyphosphate as catalyst.The effect of hydrothermal reaction temperature,catalyst amount and solution pH on fluorescence properties of carbon dots were investigated.The results showed that the carbon dots exhibited maximum fluorescence quantum yield of 12%when it was prepared under the following conditions:the hydrothermal reaction temperature was 180℃,the reaction time was 10 h,and the amount of catalyst was 0.938 mmol.In addition,a new method for determination of Hg 2+was established based on the significant quenching effect of Hg 2+on fluorescence intensity of carbon dots.The concentration of Hg 2+in range of 1.6×10-6-5.1×10-5 mol/L showed good linear relationship with the fluorescence quenching extent of carbon dots.The detection limit was 6.7×10-7 mol/L.The proposed method was applied for determination of Hg 2+in laboratory wastewater and domestic sewage samples.The relative standard deviations(RSD,n=6)of determination results were between 3.0%and 4.0%.The recoveries were 95%-107%.

关 键 词：碳点 汞(II) 荧光猝灭 水热法 

分 类 号：O657.3[理学—分析化学]