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题名: Coagulation behaviors of aluminum salts towards fluoride: Significance of aluminum speciation and transformation
作者: He, Zan; Lan, Huachun; Gong, Wenxin; Liu, Ruiping; Gao, Yuping; Liu, Huijuan; Qu, Jiuhui
刊名: SEPARATION AND PURIFICATION TECHNOLOGY
出版日期: 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
部门归属: 中国科学院饮用水科学与技术重点实验室
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.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/36162
Appears in Collections:中国科学院饮用水科学与技术重点实验室_期刊论文

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Recommended Citation:
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.
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