The adsorption of Pb(II) on Mg2Al layered double hydroxide

被引：369

作者：

Zhao, Donglin ^{[1
,2
]}

Sheng, Guodong ^{[1
]}

Hu, Jun ^{[1
]}

Chen, Changlun ^{[1
]}

Wang, Xiangke ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Plasma Phys, Key Lab Novel Thin Film Solar Cells, Hefei 230031, Peoples R China

[2] Anhui Univ Architecture, Sch Mat & Chem Engn, Hefei 230601, Peoples R China

来源：

CHEMICAL ENGINEERING JOURNAL | 2011年 / 171卷 / 01期

基金：

中国国家自然科学基金;

关键词：

Pb(II); Mg2Al LDH; Adsorption; HYDROTALCITE-LIKE COMPOUNDS; AQUEOUS-SOLUTION; IONIC-STRENGTH; HUMIC-ACID; METAL-IONS; MG-AL; FOREIGN IONS; SORPTION; REMOVAL; PH;

D O I：

10.1016/j.cej.2011.03.082

中图分类号：

X [环境科学、安全科学];

学科分类号：

083001 [环境科学];

摘要：

The adsorption behavior of Pb(II) by Mg2Al layered double hydroxide (Mg2Al LDH) was studied as a function of contact time, pH, ionic strength, foreign ions, humic substances and temperature under ambient conditions. The results showed that the kinetic adsorption could be described by a pseudo-second order model very well. The adsorption of Pb(II) on Mg2Al LDH was strongly dependent on pH and ionic strength. The presence of HSs enhanced the adsorption of Pb(II) on Mg2Al LDH at low pH, whereas reduced Pb(II) adsorption at high pH. The Langmuir model fitted the adsorption isotherms of Pb(II) better than the Freundlich model at three different temperatures of 303.15. 323.15 and 343.15 K. The thermodynamic parameters (Delta H degrees, Delta S degrees and Delta G degrees) calculated from the temperature dependent adsorption isotherms indicated that the adsorption process of Pb(II) on Mg2Al LDH was endothermic and spontaneous. The results show that Mg2Al LDH is a promising material for the preconcentration and separation of pollutants from large volumes of aqueous solutions. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：167 / 174

页数：8

共 61 条

[1]

The adsorption of Cu(II) ions on bentonite - a kinetic study [J].