Defluoridation by freshly prepared aluminum hydroxides

被引:59
作者
Liu, Ruiping [1 ]
Gong, Wenxin [1 ,2 ]
Lan, Huachun [1 ,2 ]
Gao, Yuping [1 ,3 ]
Liu, Huijuan [1 ]
Qu, Jiuhui [1 ]
机构
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, State key Lab Environm Aquat Chem, Beijing 100085, Peoples R China
[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
[3] Univ Sci & Technol, Sch Civil & Environm Engn, Beijing 100083, Peoples R China
关键词
Defluoridation; In-situ Al2O3 center dot xH(2)O; Zeta potential; Al species distribution; Solid-phase Alc; FLUORIDE REMOVAL; ADSORPTION; KINETICS;
D O I
10.1016/j.cej.2011.09.083
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The exposure to fluoride via drinking water is a great issue globally. This study investigates the adsorptive capability of the freshly prepared aluminum hydroxide, i.e., in-situ Al2O3 center dot xH(2)O, towards fluoride. The maximum adsorption of above 110 mg F/g Al is observed in pH ranges from 5.0 to 7.2. The adsorption equilibrium is achieved within 120 min, and pseudo-second-order model may well describe the adsorption kinetics (R-2 = 0.999), indicating the involvement of chemisorptions in. The characteristics of low particle diameter, high surface area, and the surface reactivity of the amorphous in-situ Al2O3 center dot xH(2)O enables its superior to remove fluoride for the in-situ Al2O3 center dot xH(2)O. pH impacts the distribution of Al species and the quantity of solid-state Al available for fluoride. The ratios of monomeric Al, i.e., Al-a, are below 4% in pH from 6 to 8, and then increase to 19.2% at pH 4 and to 28.9% at pH 10. Al-c, showing adverse trends to Ala, is the main species for fluoride removal. In cases that the amount of in-situ Al2O3 center dot xH(2)O available is the same, surface charge is dominant to affect the removal of fluoride. FTIR indicates the replacement of surface hydroxyl groups by fluoride. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:144 / 149
页数:6
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