Effect of aluminum fluoride complexation on fluoride removal by coagulation

被引：128

作者：

Gong, Wen-Xin ^{[1
,2
]}

Qu, Jiu-Hui ^{[1
]}

Liu, Rui-Ping ^{[1
]}

Lan, Hua-Chun ^{[1
]}

机构：

[1] Chinese Acad Sci, State Key Lab Environm Aquat Chem, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2012年 / 395卷

基金：

中国国家自然科学基金;

关键词：

Fluoride; Coagulation; Aluminum; Complexation; Adsorption; Coprecipitation; AQUEOUS-SOLUTION; WASTE-WATER; ADSORPTION; KINETICS; ION;

D O I：

10.1016/j.colsurfa.2011.12.010

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Effect of aluminum fluoride complexation on fluoride removal by Al salts coagulation was investigated by a series of batch experiments. Transformation of fluoride species in coagulation was studied by simultaneous determination of free fluoride and total fluoride at different pH and fluoride concentrations. Results showed that aluminum fluoride complexes dominated at low pH and high fluoride concentrations but more complexes did not represent higher fluoride removal. Comparison between coagulation with complexation and adsorption by Al(OH)(3) flocs was conducted and coagulation showed higher fluoride removal efficiency than adsorption in the pH range of 6.0-9.0. Titration test showed that Al-F complexes were coprecipitated with less OH- than Al3+. Characterization of FTIR and XPS also indicated that flocs after complexation was different from Al(OH)(3) flocs with or without fluoride. It was concluded that a new Al-F-OH coprecipitate formed in coagulation and fluoride was effectively removed by the coprecipitation. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：88 / 93

页数：6

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