Carbon Dots Derived from Facile Tailoring of Shaerhu Lignite as a Novel Fluorescence Sensor with High-Selectivity and Sensitivity for Cu2+Detection

作     者：Dr. Chong Shi Prof. Dr. Xian-Yong Wei Dr. Fang-Jing Liu Prof. Dr. Zhi-Min Zong 

作者机构：Key Laboratory of Coal Processing and Efficient Utilization Ministry of Education China University of Mining & Technology Xuzhou 221116 Jiangsu China State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering Ningxia University Yinchuan 750021 Ningxia China Laboratory of Coal Clean Conversion & Chemical Engineering Process College of Chemistry and Chemical Engineering Xinjiang University Urumqi 830046 Xinjiang Uyghur Autonomous Region China 

出 版 物：《ChemistrySelect》 

年 卷 期：2020年第5卷第39期

页      面：12125-12130页

主　　题：Lignite Luminescence Fluorescent carbon dots Quantum yield Sensor Cu2+ 

摘      要：This study aims to find an appropriate method to produce fluorescent carbon dots (FCDs) from a low-rank coal, understand the fluorescence mechanism, and explore the application prospect of the FCDs. We reported a mild, green, and cheap top-down strategy to make the FCDs by oxidizing Shaerhu lignite (SL) with H 2 O 2 , which could accelerate post-processing and avoid the release of highly toxic gases. Our approach shows a great potential for the large-scale production of FCDs using a lignite as the feedstock. SL-derived FCDs (SLDFCDs) exhibit different emission modes, in which the short wavelength emission intensity was significantly enhanced by partial reduction. Evolution of the surface states and the analysis of electronic structure show that different fluorescence centers, domains and surface defects, and nanosized sp 2 carbon could result in different emission characteristics of the SLDFCDs. The size of SLDFCDs also affects luminescence. The reduced SLDFCDs (RSLDFCDs) can be used as an efficient label-free fluorescent sensing material to detect Cu(II) ions with a low detection limit of 2.0 nM, which shows their great potential as sensors in a complex real water environment. This study provides an alternative way of directional lignite utilization for fabricating carbon materials. We also found a better way out for lignite utilization, which could lead to the development of a low cost sensor using lignites as the precursor.