木质素基碳量子点的制备及其在Fe^3+检测中的应用  

Preparation of Lignin Based Carbon Quantum Dots and Their Application in Fe^(3+) Detection

作　　者：高学霞 周希 刘美红 王春鹏[1,2] 储富祥[1,2] GAO Xuexia;ZHOU Xi;LIU Meihong;WANG Chunpeng;CHU Fuxiang(Research Institute of Forestry New Technology,CAF,Beijing 100091,China;Institute of Chemical Industry of Forest Products,CAF;National Engineering Lab.for Biomass Chemical Utilization;Key and Open Lab.of Forest Chemical Engineering,SFA;Key Lab.of Biomass Energy and Material,Jiangsu Province,Nanjing 210042,China)

机构地区：[1]中国林业科学研究院林业新技术研究所,北京100091 [2]中国林业科学研究院林产化学工业研究所,生物质化学利用国家工程实验室,国家林业局林产化学工程重点开放性实验室,江苏省生物质能源与材料重点实验室,江苏南京210042

出　　处：《林产化学与工业》2018年第5期30-36,共7页Chemistry and Industry of Forest Products

基　　金：中国林科院中央级公益性科研院所基本科研业务费专项资金(CAFYBB2017SY033)。

摘　　要：以碱木质素为原料,在强酸环境中进行氧化水热反应制备碳量子点(CQDs),并对合成条件进行优化,结果显示:最优的合成条件为碱木质素用量1.3 g,反应温度180℃,反应时间12 h,Na BH_4用量1.3 g。采用透射电镜(TEM)及激光粒度分析(DLS)对CQDs形貌及尺寸进行表征,显示CQDs具有较好的分散性,尺寸分布均匀,平均粒径约为3.5 nm。采用红外光谱(FT-IR)及X射线光电子能谱(XPS)表征CQDs结构及组成元素,表明CQDs表面含有大量羰基、羧基等含氧官能团。此外,通过紫外-可见光谱(UV-vis),荧光光谱(FL)表征CQDs光学性质,其荧光量子产率达17.3%。以CQDs为探针,采用比色法将其用于Fe^(3+)检测,结果表明:CQDs对Fe^(3+)具有较好的选择性,在0~400μmol/L范围内溶液吸光度与Fe^(3+)浓度呈线性关系(R2=0.995 4),检测限可达0.136μmol/L。同时,合成的CQDs表现出较低的细胞毒性,其在生物医药方面具有潜在应用价值。Carbon quantum dots(CQDs)were prepared from alkali lignin by hydrothermal reaction in presence of strong acid,and the synthesis conditions were optimized.The results showed that the optimal synthesis conditions were the dosage of alkali lignin 1.3 g,reaction temperature 180℃,reaction time 12 h,the dosage of NaBH 4 1.3 g.The morphology and size of CQDs were characterized by transmission electron microscopy(TEM)and laser particle size analysis(DLS).The results showed that CQDs had good dispersion and uniform size distribution,and the average particle size was about 3.5 nm.The structure and composition of CQDs were characterized by infrared spectroscopy(FT-IR)and X-ray photoelectron spectroscopy(XPS),which indicated that the surface of CQDs contained a large number of hydroxyl,carboxyl and other oxygen-containing functional groups.In addition,the optical properties of CQDs were characterized by ultraviolet visible spectroscopy(UV-vis)and fluorescence spectra(FL),and the fluorescence quantum yield was 17.3%.Using CQDs as probe,it was used to detect Fe^3+by colorimetric method.The results showed that CQDs had good selectivity to Fe^3+,its detection range was 0-400μmol/L,and the detection limit could reach 0.136μmol/L.At the same time,the low cytotoxicity of the CQDs made them having potential applications in biological medicine.

关 键 词：碳量子点 荧光性能 比色法 Fe^3+检测 

分 类 号：TQ35[化学工程]