Evaluation of phosphate removal capacity of Mg/Al layered double hydroxides from aqueous solutions

被引：110

作者：

Novillo, C. ^{[1
]}

Guaya, D. ^{[1
]}

Allen-Perkins Avendano, A. ^{[1
]}

Armijos, C. ^{[1
]}

Cortina, J. L. ^{[2
]}

Cota, I. ^{[1
]}

机构：

[1] Univ Tecn Particular Loja, Dept Chem, Loja, Ecuador

[2] Univ Politecn Cataluna, ETSEIB, Dept Chem Engn, Barcelona 08028, Spain

来源：

FUEL | 2014年 / 138卷

关键词：

Layered double hydroxides; Adsorption; Phosphate uptake; Water treatment; ENHANCED ADSORPTION; PHOSPHORUS; MECHANISMS; INTERLAYER; OXYANIONS; RECOVERY; WATER;

D O I：

10.1016/j.fuel.2014.07.010

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

In the present study, the adsorptive properties of phosphate on Mg/Al layered double hydroxides (LDHs) from aqueous solution were evaluated. The FTIR results confirmed the anionic exchange of the nitrate anions from the interlayer space with phosphate anions took place successfully. The kinetics experiments indicated that the kinetic models which best describe phosphate adsorption on LDHs are the pseudo-second order and intraparticle diffusion models. The effects of the pH and the amount of adsorbent on phosphate uptake were investigated and it was determined that the optimum conditions are pH 3 and 0.6 g/L LDH. The equilibrium isotherms showed that the phosphate uptake by Mg/Al LDH was in agreement with Freundlich model with constants of logK(F) = 1.84 and 1/n = 0.52. The effect of interfering anions on the adsorption capacity was also evaluated in the presence of several competitive anions. The results showed that in presence of other ions phosphate ion uptake decreases in the order NO3 > HCO3 > Cl > SO42 . The desorption studies showed that the phosphate adsorbed on LDH is effectively desorbed at acid and basic pH values. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：72 / 79

页数：8

共 32 条

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