Monitoring graphene oxide's efficiency for removing Re(VII) and Cr(VI) with fluorescent silica hydrogels
文献类型：期刊论文
| 作者 | Tang, Chuanqi; Zhang, Yiming; Han, Jiangang; Tian, Ziqi; Chen, Liang; Chen, Jianqiang |
| 刊名 | ENVIRONMENTAL POLLUTION
 |
| 出版日期 | 2020 |
| 卷号 | 262 |
| 关键词 | CARBON QUANTUM DOTS AQUEOUS-SOLUTION ENERGY-TRANSFER RHENIUM ADSORPTION EXTRACTION AEROGEL SENSOR SHELL ACID |
| DOI | 10.1016/j.envpol.2020.114246 |
| 英文摘要 | Supported carbon quantum dots (CQDs), used as fluorescent sensors for the detection of metal ions, have rarely been used to remove heavy metals from water. Nitrogen-doped CQDs immobilized in hydrophilic silica hydrogels exhibited a more superior sensitivity and selectivity for the detection of Re(VII) and Cr(VI) than other metal ions, including Fe(III), Fe(II), Zn(II), Cu(II) and Mn(II). For the first time, low limits of detection (LOD) of 2.3 mu M for Re(VII) detection and 65 nM for Cr(VI) detection were reported by a facile method. Based on the high selectivity of fluorescent silica hydrogels for Re(VII) and Cr(VI) detection, the removal of Re(VII) and Cr(VI) by graphene oxide (GO) in water was monitored with the hydrogels used as a turn-off fluorescent sensing platform. The consistent results of the sorption isotherms of each metal on GO, which were obtained from the fluorescence spectra and by UV absorption, further verified the possibility of monitoring metal removal by fluorescence detection. Remarkably, GO removed 1186 mg/g of Re(VII) but only 178 mg/g of Cr(VI). The density functional theory (DFT) calculations indicated that both Re(VII) and Cr(VI) formed stable bonds with silica hydrogels, confirming that the interactions between the metal ions and the substrate would promote the fluorescence quenching of the supported CQDs. On the other hand, Re(VII) interacted more strongly with the carboxyl groups of GO than Cr(VI). In addition, a real-time detection systemwas designed to alarm the service life of a GO filter used for Re(VII) removal. (C) 2020 Elsevier Ltd. All rights reserved. |
| 学科主题 | Environmental Sciences & Ecology |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20686]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | Chen, JQ (corresponding author), Nanjing Forestry Univ, Coll Biol & Environm, Dept Environm Engn, 159 Longpan Rd, Nanjing 210037, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Tang, Chuanqi,Zhang, Yiming,Han, Jiangang,et al. Monitoring graphene oxide's efficiency for removing Re(VII) and Cr(VI) with fluorescent silica hydrogels[J]. ENVIRONMENTAL POLLUTION,2020,262. |
| APA | Tang, Chuanqi,Zhang, Yiming,Han, Jiangang,Tian, Ziqi,Chen, Liang,&Chen, Jianqiang.(2020).Monitoring graphene oxide's efficiency for removing Re(VII) and Cr(VI) with fluorescent silica hydrogels.ENVIRONMENTAL POLLUTION,262. |
| MLA | Tang, Chuanqi,et al."Monitoring graphene oxide's efficiency for removing Re(VII) and Cr(VI) with fluorescent silica hydrogels".ENVIRONMENTAL POLLUTION 262(2020). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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