文献类型：期刊文献

英文题名：Synthesis of biocompatible and highly fluorescent N-doped silicon quantum dots from wheat straw and ionic liquids for heavy metal detection and cell imaging

作者：Chen, Jianqiang[1] Yu, Yang[1] Zhu, Bijun[2] Han, Jiangang[1] Liu, Chao[2] Liu, Chengguo[3] Miao, Leiying[2] Fakudze, Sandile[1]

第一作者：Chen, Jianqiang

通信作者：Chen, JQ[1];Miao, LY[2]

机构：[1]Nanjing Forestry Univ, Coll Biol & Environm, 159 Longpan Rd, Nanjing 210037, Peoples R China;[2]Nanjing Univ, Nanjing Stomatol Hosp, Med Sch, Nanjing 210008, Peoples R China;[3]Chinese Acad Forestry, Inst Chem Ind Forestry Prod, 16 Suojin Wucun, Nanjing 210042, Peoples R China

年份：2021

卷号：765

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20204409417443);Scopus(收录号：2-s2.0-85093965042);WOS:【SCI-EXPANDED(收录号:WOS:000616232300130)】；

基金：This work was supported by the National Natural Science Foundation of China (31822009, 31770615, 51603104), Fundamental Research Funds of CAF (CAFYBB2020QA005), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Qing Lan Project of Jiangsu Province, Nanjing Clinical Research Center for Oral Diseases (2019060009), Key Project supported by Medical Science and Technology Development Foundation, and Nanjing Department of Health under Grant (ZKX19031, YKK18126).

语种：英文

外文关键词：Silicon quantum dots; Wheat straw; Ionic liquids; Metal detection; Cell imaging

摘要：Silane-based precursors for the synthesis of water-dispersible silicon quantum dots (SiQDs) present harmful effects on both researchers and the environment, due to their high toxicity. Though waste wheat straw is an abundant source of natural silicon, its application towards the synthesis of biocompatible SiQDs for metal detection has not yet been explored. In this study, N-doped SiQDs demonstrating uniform spherical morphologies, excellent water dispersity and strong fluorescence emission with a quantum yield of 28.9% were facilely synthesized by using wheat straw (WS) as silicon source and allyl-3-methylimidazolium chloride (AMIMCl) as nitrogen source. The wheat straw based SiQDs (WS-SiQDs) showed linear fluorescence quenching ((F-0-F)/F) with Cr(VI) and Fe(III) concentration in the range of 0-6x10(-4) M. Following immobilization on hydrophilic silica hydrogels, WS-SiQDs@silica hydrogels demonstrated enhanced fluorescence emission which can selectively detect Cr(VI) and Fe (III) to the limits of 142 and 175 nM, respectively. Moreover, cell imaging results reflected thatWS-SiQDs can penetrate the membranes of dental pulp stem cells and react with the nucleuses of the stem cells. The stem cells maintained high viability under the conditions of 24 h incubation and SiQD concentration below 50 mg.L-1, thus indicating low cytotoxicity ofWS-SiQDs. The as-prepared SiQDs demonstrated notable structural and fluorescent properties, therefore representing promising biocompatible fluorescent nanomaterials for metal detection and cell imaging. (C) 2020 Elsevier B.V. All rights reserved.