Removal of copper(II) and lead(II) from aqueous solution by manganese oxide coated sand - I. Characterization and kinetic study

被引:265
作者
Han, Runping
Zou, Weihua
Zhang, Zongpei
Shi, Jie
Yang, Jiujun
机构
[1] Zhengzhou Univ, Dept Chem, Zhengzhou 450052, Peoples R China
[2] Zhengzhou Univ, Coll Mat Sci & Engn, Zhengzhou 450052, Peoples R China
关键词
manganese oxide coated sand (MOCS); Cu(II); Pb(II); adsorption kinetic;
D O I
10.1016/j.jhazmat.2006.02.021
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The preparation, characterization, and sorption properties for Cu(II) and Pb(II) of manganese oxide coated sand (MOCS) were investigated. A scanning electron microscope (SEM), X-ray diffraction spectrum (XRD) and BET analyses were used to observe the surface properties of the coated layer. An energy dispersive analysis of X-ray (EDAX) and X-ray photoelectron spectroscopy (XPS) were used for characterizing metal adsorption sites on the surface of MOCS. The quantity of manganese on MOCS was determined by means of acid digestion analysis. The adsorption experiments were carried out as a function of solution pH, adsorbent dose, ionic strength, contact time and temperature. Binding of Cu(H) and Pb(H) ions with MOCS was highly pH dependent with an increase in the extent of adsorption with the pH of the media investigated. After the Cu(II) and Pb(II) adsorption by MOCS, the pH in solution was decreased. Cu(H) and Pb(II) uptake were found to increase with the temperature. Further, the removal efficiency of Cu(II) and Pb(II) increased with increasing adsorbent dose and decreased with ionic strength. The pseudo-first-order kinetic model, pseudo-second-order kinetic model, intraparticle diffusion model and Elovich equation model were used to describe the kinetic data and the data constants were evaluated. The pseudo-second-order model was the best choice among all the kinetic models to describe the adsorption behavior of Cu(II) and Pb(II) onto MOCS, suggesting that the adsorption mechanism might be a chemisorption process. The activation energy of adsorption (E.) was determined as Cu(II) 4.98 kJ mol(-1) and Pb(II) 2.10 kJ mol(-1), respectively. The low value of Ea shows that Cu(II) and Pb(II) adsorption process by MOCS may involve a non-activated chemical adsorption and a physical sorption. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:384 / 395
页数:12
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