文献类型：期刊文献

英文题名：Carbon quantum dot synthesis of a Ag/PCQD composite for the visual detection of Hg2+ in dH2O solution and seawater samples

作者：Wu, Lin-Li Li, Xiao-Hong Liu, Ying Leng, Yan-Li Li, Yang Cai, Xiao-Hua

第一作者：Wu, Lin-Li

机构：[1] School of Chemical Engineering, Guizhou Minzu University, Guizhou, Guiyang, 550025, China; [2] School of Chemical Engineering, Guizhou Institute of Technology, Guiyang, 550003, China

第一机构：School of Chemical Engineering, Guizhou Minzu University, Guizhou, Guiyang, 550025, China

年份：2022

卷号：46

期号：46

起止页码：22213-22221

外文期刊名：New Journal of Chemistry

收录：EI(收录号：20224813164776);Scopus(收录号：2-s2.0-85142427566)

语种：英文

外文关键词：Carbon - Chlorine compounds - Colorimetry - Mercury compounds - Nanocrystals - Seawater - Silver compounds - Ultrasonic applications

摘要：In this study, carbon quantum dots (PCQDs) were synthesized via a simple, green, single-step ultrasonic method from palm mane with a fluorescence quantum yield (QY) of 38.5%. A stable silver nanoparticle/carbon quantum dot (Ag/PCQD) composite was prepared using PCQDs and silver nitrate with a color change from brown to red-brown. When Hg2+ from Hg(ClO4)2 was introduced to the Ag/PCQD composite in dH2O solution and seawater samples, a color change from red-brown to colorless was observed. The interactions between the PCQDs, Ag/PCQDs and Ag/PCQDs after the addition of Hg2+ were investigated using TEM and XPS analyses. The analyses showed that the formation of a silver-mercury (AgHg) amalgam could be the working mechanism of this system. Moreover, we found that the Ag/PCQDs can also detect Hg2+ from HgCl2, Hg(NO3)2, Hg(OAc)2 and CH3HgCl (organic mercury species) with good detection performance in dH2O solution and seawater samples. It is vital to develop a sensing method that can detect Hg2+ in seawater samples. Therefore, an efficient sensing platform for detecting Hg2+ in pure water solution and seawater was constructed using the Ag/PCQD composite prepared from palm mane biomass. When Hg2+ from Hg(ClO4)2 was added to dH2O and 3.5% saline solution, the calculated detection limits were found to be 35.4 and 14.3 nM, respectively. The detected concentration exceeds the Hg2+ concentrations commonly found in seawater (～300-400 nM). Furthermore, it is possible to improve the on-site analysis of complex seawater samples with colorimetric response without the need for complex equipment. Our strategy provides a highly innovative, rapid and low-cost method for the detection of Hg2+ in complex water matrices and seawater samples. ? 2022 The Royal Society of Chemistry.