以太西煤为碳源合成碳量子点用于铁离子检测的研究  

Detection of Ferric Iron Using Carbon Quantum Dots Synthesized with Taixi Coal as Carbon Source

作　　者：张慧佳 石静 晋晓勇 彭娟[1,2] ZHANGHui- jia;SHIJing;JINXiao- yong;PENGJuan(Stage Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering,Yinchuan 750021,China;College of Chemistry and Chemical Engineering,Ningxia University,Yinchuan 750021,China)

机构地区：[1]省部共建煤炭高效利用与绿色化工国家重点实验室,宁夏银川750021 [2]宁夏大学化学化工学院,宁夏银川750021

出　　处：《分析测试学报》2018年第6期724-728,共5页Journal of Instrumental Analysis

基　　金：国家自然科学基金项目(21765016);宁夏高等学校国内一流学科建设化学工程与技术学科项目(NXYLXK2017A04);西部一流大学建设重大创新项目(ZKZD2017003)

摘　　要：以太西煤为碳源,采用硝酸氧化法辅助水热合成了具有绿色荧光的碳量子点(CDs)。该量子点具有良好的稳定性和水分散性,平均尺寸为3.64 nm。通过透射电子显微镜(TEM)、X射线光电子能谱仪(XPS)、傅立叶红外光谱仪(FTIR)、紫外-可见吸收光谱仪(UV-Vis)、荧光光谱仪等对碳量子点的结构和光学性能进行表征。基于荧光猝灭原理,在最优检测条件下,Fe3+在0.6×10-6~2.5×10-6mol/L及3.0×10-6~21.0×10-6mol/L浓度范围内与CDs的荧光猝灭效率呈良好的线性关系,Fe3+的检出限为6.7×10-7mol/L。Carbon quantum dots（ CDs） with green fluorescence were synthesized by nitric acid oxidation and hydrothermal method with Taixi coal as carbon source. The CDs had good stability and water dispersibility with an average diameter of 3. 64 nm. The structures and optical properties of the CDs were characterized by transmission electron microscopy（ TEM）,X-ray photoelectron spectroscopy（ XPS）,Fourier transform infrared spectroscopy（ FTIR）,UV-Vis spectroscopy and fluorescence spectroscopy. Based on the fluorescence quenching principle,the fluorescence intensity of CDs decreased with the increase of Fe3 ＋concentration under the optimal detection conditions. The fluorescence quenching efficiency of CDs was in good linearity with Fe3 ＋in the concentration ranges of 0. 6× 10-6-2. 5 × 10-6 mol/L and 3. 0 × 10-6-21. 0 × 10^（-7） mol/L,and the detection limit for Fe3 ＋was 6. 7 × 10^（-7） mol/L.

关 键 词：碳量子点(CDs) 太西煤 荧光猝灭 FE3+ 

分 类 号：O657.3[理学—分析化学] O614.811[理学—化学]