Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation | |
He, Zan; Lan, Huachun; Gong, Wenxin; Liu, Ruiping; Gao, Yuping; Liu, Huijuan; Qu, Jiuhui | |
刊名 | SEPARATION AND PURIFICATION TECHNOLOGY |
2016-06-13 | |
卷号 | 165期号:0页码:137-144 |
关键词 | Fluoride Al sAlts Coagulation Al Species Transformation Al-f Complexes Esi-ms |
DOI | 10.1016/j.seppur.2016.01.017 |
英文摘要 | This study investigates the effects of aluminum (Al) and F interactions on the coagulation behaviors of Al salts, i.e., AlCl3 and polymer aluminum chloride (PACl) at different basicity (B) towards fluoride. These coagulants achieve the optimum fluoride removal over pH 6-7, and PACl exhibits higher removal efficiency than AlCl3 does over pH 4-9. The removal of fluoride is positively correlated with the content of either Al-13 or Al-b in Al-based coagulants over pH 4-9 and increases in the order: PACl(2) > PACl(1) > AlC13. As for PACl, the increased B from 0 to 2.4 improves fluoride removal owing to the elevated ratios of Al-b. However, at further increased B to 2.8, the formation of colloidal Al species (Al-c) occurs and this effect adversely inhibits fluoride removal thereafter. The removal of fluoride by these coagulants increases with elevated initial fluoride concentrations ([F](0)) from 0 to 20 mg/L. At high [F](0) of 80 mg/L, fluoride removal by AlC13 decreases to as low as 13.1% owing to the formation of soluble Al-F complexes, as indicated from the high residual Al concentrations of 16 mg/L. Interestingly, this adverse effect can hardly be observed for PACT due to the stronger stability of Al-13 or Al-b. As for AlC13 and PACl, the introduction of fluoride changes the Al species distribution to some extent owing to the Al-F complexation, as indicated by the analysis of electrospray ionization mass spectrometry. The possible Al-F complexes formed fluoride and different Al species are proposed thereafter. PACl with diverse Al species and high Alb or Al-13 content shows higher removal efficiency towards fluoride than AlC13 does, especially at high [F](0) or under acidic pH and alkaline pH conditions. (C) 2016 Elsevier B.V. All rights reserved. |
内容类型 | 期刊论文 |
源URL | [http://ir.rcees.ac.cn/handle/311016/36162] |
专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
推荐引用方式 GB/T 7714 | He, Zan,Lan, Huachun,Gong, Wenxin,et al. Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation[J]. SEPARATION AND PURIFICATION TECHNOLOGY,2016,165(0):137-144. |
APA | He, Zan.,Lan, Huachun.,Gong, Wenxin.,Liu, Ruiping.,Gao, Yuping.,...&Qu, Jiuhui.(2016).Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation.SEPARATION AND PURIFICATION TECHNOLOGY,165(0),137-144. |
MLA | He, Zan,et al."Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation".SEPARATION AND PURIFICATION TECHNOLOGY 165.0(2016):137-144. |
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