A novel precipitant for the selective removal of fluoride ion from strongly acidic wastewater: Synthesis, efficiency, and mechanism
文献类型：期刊论文
| 作者 | Hu, Xingyun ; Zhu, Feng; Kong, Linghao; Peng, Xianjia
|
| 刊名 | JOURNAL OF HAZARDOUS MATERIALS
 |
| 出版日期 | 2021-02-05 |
| 卷号 | 403页码:- |
| 关键词 | Fluoride Strongly acidic wastewater Organosilicon Substitution Polycondensation |
| ISSN号 | 0304-3894 |
| 英文摘要 | The strongly acidic wastewater containing fluoride [F(-I)] is generally neutralized using lime, producing massive hazardous solid waste, which may present serious environmental risks. In this study, a novel precipitant, N,N '-Bis (3-(triethoxysilyl)propyl)thiourea, was developed for the selective removal of F(-I) from strongly acidic wastewater. The precipitant was synthesized using (3-aminopropyl)triethoxysilane and thiourea at a molar ratio of 2:1 under 160 degrees C. More than 90% of initial F(-I) was removed by the prepared precipitant from strong acidic wastewater produced by nonferrous metal smelting industry, and the residual F(-I) concentration decreased to below 100 mg/L. The F(-I) removal performance is almost free from the interference of coexisting ions. Only 6 kg/m(3) of fluoride slag, which can be recycled as a concrete waterproofing agent, was produced. The F(-I) removal mechanism including substitution, polycondensation, ion exchange and complexation was clarified: OH on Si atoms in the hydrolysis product of BTPT was substituted by F(-I), and a fluoro-substituted product formed; the polycondensation of BTPT and fluoro-substituted product produced polymer precipitates; the specific adsorption of F(-I) on the polymer precipitates occurred through ion exchange with-OH and complexation with-NH2+-. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45899]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Natl Engn Lab Ind Wastewater Treatment, Beijing 100085, Peoples R China 3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Xingyun,Zhu, Feng,Kong, Linghao,et al. A novel precipitant for the selective removal of fluoride ion from strongly acidic wastewater: Synthesis, efficiency, and mechanism[J]. JOURNAL OF HAZARDOUS MATERIALS,2021,403:-. |
| APA | Hu, Xingyun,Zhu, Feng,Kong, Linghao,&Peng, Xianjia.(2021).A novel precipitant for the selective removal of fluoride ion from strongly acidic wastewater: Synthesis, efficiency, and mechanism.JOURNAL OF HAZARDOUS MATERIALS,403,-. |
| MLA | Hu, Xingyun,et al."A novel precipitant for the selective removal of fluoride ion from strongly acidic wastewater: Synthesis, efficiency, and mechanism".JOURNAL OF HAZARDOUS MATERIALS 403(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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