期刊
FUEL
卷 138, 期 -, 页码 72-79出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2014.07.010
关键词
Layered double hydroxides; Adsorption; Phosphate uptake; Water treatment
资金
- SENESCYT
- Department of Chemistry of the Universidad Tecnica Particular de Loja [PROY_QUI_0002]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据