Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation
文献类型：期刊论文
| 作者 | Liu, Ruiping; Liu, Bao; Zhu, Lijun; He, Zan; Ju, Jiawei; Lan, Huachun; Liu, Huijuan |
| 刊名 | JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA
 |
| 出版日期 | 2015-06-01 |
| 卷号 | 32页码:118-125 |
| 关键词 | Fluoride Aluminum coagulation Al-F complexes zeta-Potential Adsorbent reclamation |
| 英文摘要 | This study focuses on the effects of pH and fluoride at different molar ratios of fluoride to Al (R-F:Al) on the removal of cadmium (Cd2+) and phosphate by Al coagulation. Fluoride at R-F:Al >= 3:1 inhibits the removal of Cd over wide Al dose ranges from 5 to 10 mg/L as Al. The removal of phosphate decreases significantly at high R-F:Al of 10: 1 whereas at lowered RF: Al (i.e., <= 6: 1), an adverse effect is observed only at insufficient Al doses below 2 mg/L. Fluoride shows inhibitive effects towards the removal of Cd at pH 7 and 8 and that of phosphate at pH 6. Fluoride decreases the zeta-potential in both systems, and the decreasing extent is positively correlated to the elevated R-F:Al. The Al fluoride interactions include the formation of Al-F complexes and the adsorption of fluoride onto Al(OH)(3) precipitates, i.e., the formation of Al(OH)(n)F-m. Al-F complex formation inhibits Al hydrolysis and increases residual Al levels, and a more significant increase was observed at lower pH. Al-F complexes at high R-F:Al complicate the coagulation behavior of Al towards both negative and positive ionic species. Moreover, fluoride at low R-F:Al shows little effect on Al coagulation behavior towards Cd2+ and phosphate, and the spent defluoridation adsorbent, i.e., aluminum (Al) hydro(oxide) with adsorbed fluoride at R-F:Al of below 0.1: 1, may be reclaimed as a coagulant after being dissolved. (C) 2015 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. |
| 研究领域[WOS] | Environmental Sciences |
| WOS记录号 | WOS:000356231900014 |
| 公开日期 | 2016-03-15 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/32762]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Liu, Ruiping,Liu, Bao,Zhu, Lijun,et al. Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation[J]. JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,2015,32:118-125. |
| APA | Liu, Ruiping.,Liu, Bao.,Zhu, Lijun.,He, Zan.,Ju, Jiawei.,...&Liu, Huijuan.(2015).Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation.JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA,32,118-125. |
| MLA | Liu, Ruiping,et al."Effects of fluoride on the removal of cadmium and phosphate by aluminum coagulation".JOURNAL OF ENVIRONMENTAL SCIENCES-CHINA 32(2015):118-125. |
入库方式： OAI收割
来源：生态环境研究中心
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