碳量子点的绿色合成及检测水体中苦味酸  

A green and facile synthesis of carbon quantum dots and the detection of picric acid in water

作　　者：张玉娟[1] 赵智慧[1] 王英特[1] 陈莉[1] 张勇[1] 

机构地区：[1]山西大学化学化工学院,太原030006

出　　处：《分析试验室》2016年第11期1259-1263,共5页Chinese Journal of Analysis Laboratory

基　　金：山西省回国留学人员科研资助项目(2015-001)资助

摘　　要：以香蕉为碳源,采用绿色、经济的一步溶剂水热法合成得到了水溶性好、稳定性高的蓝色荧光碳量子点。通过X射线衍射（XRD）、透射电镜（TEM）、傅里叶红外光谱（FTIR）、紫外-可见吸收光谱和荧光光谱等方法对样品的形貌、结构和光谱性能进行了表征。苦味酸对该碳量子点荧光具有猝灭作用,其荧光猝灭程度与苦味酸浓度在0.5~30.4μmol/L范围内呈良好的线性关系,检出限为9.48×10-8mol/L（S/N=3）。方法用于实际样品中苦味酸的测定,回收率为96.4%~101.4%。通过吸收光谱的变化确定了二者的猝灭类型。Fluorescent carbon quantum dots （CQDs） with an obvious bright blue color under UV light （365nm） were synthesized by a green and economical one-step solvo-thermal method using banana as carbon source. The products were characterized by X-ray diffraction （ XRD）, transmission electron microscopy （ TEM）, Fourier transform infrared spectroscopy （ FTIR ）, ultraviolet-visible spectrophotometry and fluorescence spectrophotometry. It has been found that the fluorescence could be well quenched by picrie acid with high specificity. The fluorescence intensity showed linear responses to picric acid in the concentration range from 0. 5 to 30. 4 μmol/L, with the detection limit of 9.48 × 10-s mol/L （S/N =3）. The results indicate that CQDs can act as a new fluorescence probe for detecting picrie acid with a low detection limit and extremely high sensitivity. Moreover, the as-proposed method was further extended for the determination of picric acid in real water samples, and the recovery was 96. 4% - 101.4%. The type of quenching was determined by the changes of

关 键 词：碳量子点 绿色合成 苦味酸 

分 类 号：X502[环境科学与工程—环境工程]