Preparation of Nitrogen-doped Carbon Dots from Coke Powder as a Fluorescent Chemosensor for Selective and Sensitive Detection of Cr (Ⅵ)

查看全文 作　　者：[1]孟娟;LI [2]Shiqian;[1]丁玲;ZHOU [1]Chuang;JIANG [1]Rui;ZHANG [1]Qingtian;CHENG [1]Zhengzai;GAUTHIER [1,3]Mario;HU [1]Ya;[1]伍林 机构地区：[1]School of Chemistry and Chemical Engineering,Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel making,Wuhan University of Science and Technology,Wuhan 430081,China;[2]Fujian Universities and Colleges Engineering Research Center of Modern Facility Agriculture of Fujian University,Fujian Polytechnic Normal University,Fuqing 350300,China;[3]Chemistry Department,University of Waterloo,Waterloo,Ontario,N2L 3G1,Canada 出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2022年第37卷第6期,共9页 基　　金：by the National Nature Science Foundation of China(61904130);the Open Fund of the Fujian Universities and Colleges Engineering Research Center of Modern Facility Agriculture of Fujian University(G2-KF2002);the Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices,Ministry of Education,Jianghan University(JDGD202017);the Open Fund of the Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel Making(Wuhan University of Science and Technology)of China(KF-20-5);the Fund of Hangzhou Meishi Technology Co.,Ltd of China(2021420112000081);the Key Research and Development Program of Hubei Province(2020BAB084);the Program(BG20190227001)of High-end Foreign Experts of the State of the State Administration of Foreign Experts Affairs(SAFEA)。 摘　　要：The nitrogen-doped carbon dots(N-CDs)were prepared by using coke powder as carbon source and one-step hydrothermal method.The N-CDs were studied as a fluorescent chemosensor for determining Cr(Ⅵ)in water.The selective,sensitive,reproducibility and stability of as-prepared N-CDs were investigated.The morphology,composition and properties of N-CDs were characterized by a series of methods.The fluorescence quenching of N-CDs by Cr(Ⅵ)was explored.The experimental results reveal that the obtained N-CDs have great hydrophilicity and strong luminescence properties,which demonstrates the successful doping of nitrogen into the CDs.The surface-active groups and emission wavelength range of CDs increase due to the electronegativity and electron donor effect of doping N atom.Furthermore,the N-CDs exhibit good photochemical properties for the detection of Cr(Ⅵ),including a wide linear range from 0.3 to 200μM(R^(2)=0.9935)and a low detection limit of 0.10μM at the signal-to-noise ratio of 3(S/N=3).Moreover,the N-CDs as a sensor was used successfully for Cr(Ⅵ)detection in real water samples with recovery rates of 99.9%-110.6%.This sensor also shows highly reproducibility and stability.The N-CDs fluorescent chemical sensor may be a potential candidate for applying in the field of other fluorescent chemical sensing,catalysis,photoelectric devices and other fields. 关 键 词：carbon dots nitrogen doping PREPARATION fluorescence detection Cr(Ⅵ)