Removal of fluoride from aqueous solution using granular acid-treated bentonite (GHB): Batch and column studies

被引：65
|
作者：
Ma, Yuxin [1 ,2 ]
Shi, Fengmei [3 ]
Zheng, Xilai [4 ]
Ma, Jun [3 ]
Gao, Congjie [2 ]
机构：
[1] Heilongjiang Univ, Coll Architecture & Civil Engn, Harbin 150080, Peoples R China
[2] Ocean Univ China, Coll Chem & Chem Engn, Qingdao 266100, Peoples R China
[3] Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Peoples R China
[4] Ocean Univ China, Coll Environm Sci & Engn, Qingdao 266100, Peoples R China
来源：
JOURNAL OF HAZARDOUS MATERIALS | 2011年 / 185卷 / 2-3期
基金：
中国国家自然科学基金;
关键词：
Granular acid-treated bentonite (GHB); Fluoride removal; Adsorption; Dubinin-Rasdushkevich (D-R) equation; Thomas model; Regeneration; RED MUD; DONNAN DIALYSIS; ION-EXCHANGE; ADSORPTION; WATER; MONTMORILLONITE; SORPTION; URANIUM; BED;
D O I：
10.1016/j.jhazmat.2010.10.016
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Removal of fluoride from aqueous solution using granular acid-treated bentonite (GHB) was studied by batch and column adsorption experiments. The results of the batch adsorption experiments demonstrated that the maximum fluoride removal was obtained at pH of 4.95 and it took 40 min to attain equilibrium. Kinetics data fitted pseudo-second-order model. Batch adsorption data was better described by Redlich-Peterson and Freundlich isotherm models than Langmuir isotherm model. The adsorption type of GHB was ion exchange. Column experiments were carried out at different influent fluoride concentrations and different flow rates. The capacities of the breakthrough and exhaustion points increased with the decrease of flow rate and the increase of initial fluoride concentration. The experimental results were well fitted with Thomas model. Exhausted GHB was regenerated by alkali/alum treatment. The total sorption capacity of GHB was increased after regeneration and activation. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1073 / 1080
页数：8
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