碳量子点/金纳米复合材料荧光增强法测定废水中苯酚  

Determination of phenol in waste water by fluorescence enhancement method with carbon quantum dots/gold nanocomposite

作　　者：李满秀[1] 李海平[1] 任光明[1] 何红芳 刘莉莉 LI Man-xiu;LI Hai-ping;REN Guang-ming;HE Hong-fang;LIU Li-li(Department of Chemistry, Xinzhou Teachers′ University, Xinzhou 034000, China)

机构地区：[1]忻州师范学院化学系,山西忻州034000

出　　处：《冶金分析》2019年第5期32-36,共5页Metallurgical Analysis

基　　金：山西省1331工程重点学科建设计划项目(晋教财(2017)122);材料与计算化学山西省高等学校重点实验室基金(2013)

摘　　要：以碳量子点(CQDs)与氯金酸作用制得碳量子点/金(CQDs/Au)纳米复合材料,并分别采用紫外可见分光光度计、荧光分光光度计和傅立叶变换红外光谱仪对CQDs/Au进行了表征。根据苯酚可使CQDs/Au在445nm处的荧光明显增强,建立了荧光增强法测定水样中苯酚含量的新方法,同时对CQDs/Au与苯酚相互作用的条件进行了优化。于pH=4.35B-R缓冲溶液存在的条件下,在最大激发/发射波长为342nm/445nm处测定体系的荧光强度,结果表明:苯酚浓度在6.0×10^(-6)～9.0×10^(-5) mol/L范围内与体系荧光强度呈线性,相关系数为0.9952,方法检出限为5.4×10-6 mol/L。将实验方法应用于测定药厂废水样中苯酚的测定,测得结果与光度法基本一致,相对标准偏差(RSD,n=5)为1.8%～2.1%,回收率为94%～101%。The carbon quantum dots/gold nanocomposite (CQDs/Au) was prepared by reaction between carbon quantum dots (CQDs) and chloroauric acid. Then CQDs/Au was characterized using ultraviolet and visible spectrophotometer, fluorescence spectrometer and Fourier transform infrared spectrometer. Since phenol could significantly enhance the fluorescence of CQDs/Au at 445 nm, a new determination method of phenol in water sample by fluorescence enhancement method was established. Meanwhile, the interaction conditions between CQDs/Au and phenol were optimized. The fluorescence intensity of testing system was measured at maximum excitation/emission wavelength of 342 nm/445 nm in presence of B-R buffer solution at pH=4.35. The results showed that the concentration of phenol in range of 6.0×10^-6 -9.0×10^-5 mol/L was linear to the fluorescence intensity of system. The linear correlation coefficient was 0.995 2. The detection limit of method was 5.4×10^-6 mol/L. The experimental method was applied to the determination of phenol in waste water from a pharmaceutical factory. The found results were basically consistent with those obtained by spectrophotometry. The relative standard deviation (RSD, n =5) was in range of 1.8%-2.1%. The recoveries were between 94% and 101%.

关 键 词：碳量子点/金纳米复合材料 荧光增强法 苯酚 

分 类 号：O657.3[理学—分析化学]