检测环境水体中银离子含量的新型碳基光学传感器  

A New Carbon-based Optical Sensor for Detecting Silver Ion in Environmental Water

作　　者：胡云[1] 陈中庸 周芯吉 刘美红[1] 周希 HU Yun;CHEN Zhongyong;ZHOU Xinji;LIU Meihong;ZHOU Xi(Institute of Chemical Industry of Forest Products,CAF,National Engineering Lab.for Biomass Chemical Utilization,Key Lab.of Chemical Engineering of Forest Products,National Forestry and Grassland Administraction,Key Lab.of Biomass Energy and Material,Jiangsu Province,Nanjing 210042,China;School of Chemistry and Chemical Engineering,Nantong University,Nantong 226019,China)

机构地区：[1]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,国家林业和草原局林产化学工程重点实验室,江苏省生物质能源与材料重点实验室,江苏南京210042 [2]南通大学化学化工学院,江苏南通226019

出　　处：《生物质化学工程》2022年第3期9-15,共7页Biomass Chemical Engineering

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(CAFYBB2018GD002)。

摘　　要：以木质素磺酸钙为原料,通过常温下分子自组装和超声波辅助法制备木质素基碳量子点(CQDs),探究木质素磺酸钙和NaBH_(4)对CQDs荧光性能的影响并优化CQDs合成条件。研究结果显示:优化后的CQDs合成条件为木质素磺酸钙质量浓度60 g/L,还原剂NaBH_(4)质量浓度50 g/L。利用透射电子显微镜(TEM)、红外光谱(FT-IR)、X射线光电子能谱(XPS)、紫外-可见光谱(UV-vis)和荧光光谱(FL)对CQDs的结构形貌及光学特性进行分析,结果显示:CQDs粒径小((9.5±0.5)nm)且分布均匀、无团聚现象,光学性能优异且荧光量子产率达12.4%。此外,基于CQDs探究不同银离子浓度对其荧光强度的影响,结果表明:CQDs对Ag^(+)具有较好的荧光识别性和灵敏度,在0~250μmol/L范围内CQDs荧光淬灭强度比值与Ag^(+)浓度呈线性关系(R^(2)=0.998),检测限可达525 nmol/L。同时,CQDs荧光选择性优异且表现出较低的细胞毒性,有望在生物传感和环境检测领域展现出潜在应用价值。Lignin-based carbon quantum dots(CQDs)were prepared with calcium lignosulfonate as precursor by molecular selfassembly and ultrasound-assisted method at room temperature.The effects of calcium lignosulfonate and NaBH_(4) on the fluorescence property of CQDs were studied,and the synthesis condition of CQDs was also optimized.The optimal preparation conditions were as follows:the mass concentration of calcium lignosulfonate was 60 g/L,the mass concentration of reducing agent NaBH_(4) was 50 g/L.The structural morphology and optical properties of CQDs were confirmed by transmission electron microscopy(TEM),infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),UV-visible spectroscopy(UVvis),and fluorescence spectroscopy(FL).The experimental results showed that CQDs had small particle size((9.5±0.5)nm),uniform distribution,no agglomeration phenomenon,excellent optical properties,and fluorescence quantum yield of 12.4%.In addition,CQDs were used to investigate the effect of different silver ion concentrations on the fluorescence intensity.The results showed that CQDs had good fluorescence recognition and sensitivity to Ag^(+),with a linear detection range(R^(2)=0.998)of 0-250μmol/L and a detection limit of 525 nmol/L.Meanwhile,CQDs fluorescence showed excellent selectivity and low cytotoxicity,which was expected to show potential application value in biosensing and environmental detection fields.

关 键 词：碳纳米点 荧光性能 检测Ag+ 

分 类 号：TQ35[化学工程]