发光学报2023，Vol.44Issue(12)：2265-2276,12.DOI:10.37188/CJL.20230244
煤基碳量子点制备及对环境水中Cr(Ⅵ)的测定
Preparation of Coal-based Carbon Quantum Dots and Determination of Cr(Ⅵ)in Environmental Water
摘要
Abstract
Nitrogen-doped carbon quantum dots(N-CQDs)were synthesized by a one-step hydrothermal method using Hailaer brown coal pyrolytic extract and nitric acid as carbon,nitrogen sources.The fluorescent probe based on N-CQDs was developed for the recognition of Cr(Ⅵ).The morphology,structure,composition and optical proper-ties of N-CQDs were characterized by TEM,FT-IR,Raman,XPS analysis,fluorescence spectra,and UV-Vis ab-sorption spectra,respectively.The results show that the N-CQDs exhibits a good dispersion with the particle size of about 2.01 nm in water.Lots of nitrogen-and oxygen-containing groups of hydroxyl,epoxy,carboxyl and nitro groups were found on the surface.The as-prepared N-CQDs emits yellow-green photoluminescence under 340 nm UV light with an absolute quantum yield of 1.26%.The fluorescence spectra show that the maximum excitation wave-length of N-CQDs is 340 nm and the maximum emission wavelength is 556 nm.The fluorescence emission is non-ex-citation dependent(280-440 nm).In addition,N-CQDs exhibit excellent optical properties in the pH range between 4 and 11 as well as at a low concentration of NaCl and KCl.The quenching effect of various anions on their fluores-cence intensity was analyzed.The linear relationship between Cr(Ⅵ)and N-CQDs(F0/F)fluorescence quenching was found at range of 0-200 μmol/L with the detection limit of 0.56 μmol/L,and the detection results are consistent with the ICP-OES method.关键词
碳量子点/Cr(Ⅵ)/离子检测Key words
carbon quantum dots/Cr(Ⅵ)/ion detection分类
数理科学引用本文复制引用
闫立东,胡朝帅,程俊霞,朱亚明,赵雪飞..煤基碳量子点制备及对环境水中Cr(Ⅵ)的测定[J].发光学报,2023,44(12):2265-2276,12.基金项目
国家自然科学基金(22208138)Supported by National Natural Science Foundation of China(22208138) （22208138）
