Adsorption of cd, cu, ni, pb and zn on Sphagnum peat from solutions with low metal concentrations

被引：106

作者：

Kalmykova, Yuliya ^{[1
]}

Stroemvall, Ann-Margret ^{[1
]}

Steenari, Britt-Marie ^{[2
]}

机构：

[1] Chalmers Univ Technol, Dept Civil & Environm Engn, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Chem & Biol Engn, SE-41296 Gothenburg, Sweden

来源：

JOURNAL OF HAZARDOUS MATERIALS | 2008年 / 152卷 / 02期

关键词：

adsorption; heavy metals; sphagnum peat; freundlich isotherm;

D O I：

10.1016/j.jhazmat.2007.07.062

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This work investigates adsorption of metal ions on Sphagnum peat from solutions with environmentally relevant concentrations of metals. The peat moss is intended as an alternative, low-cost filter material for contaminated waters. Adsorption of Cd, Cu, Ni, Pb and Zn was studied in batch tests, and adsorption isotherms were determined. The kinetics of adsorption was analyzed using a second-order model and rate constants were calculated. An empirical model for predicting adsorption of metal ions at a given time was derived from these constants. Metal ions were removed in the descending order Pb > Cu > Ni > Cd > Zn. Relationship between the affinities of the metals to the peat active sites with chemical properties for the metals were indicated by the results. In addition, equilibration studies were performed at constant pH and ionic strength. The experimental data fitted the Freundlich equation. Both the uptake of metals and the Freundlich constants increased in line with increasing pH. The Freundlich exponent declined with higher initial concentrations, suggesting adsorption to sites with lower activity. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：885 / 891

页数：7

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