The use of fly ash as a low cost, environmentally friendly alternative to activated carbon for the removal of heavy metals from aqueous solutions

被引:83
作者
Cetin, Serpil [1 ]
Pehlivan, Erol [1 ]
机构
[1] Selcuk Univ, Fac Engn & Architecture, Dept Chem Engn, Konya, Turkey
关键词
fly ash; activated carbon; adsorption;
D O I
10.1016/j.colsurfa.2006.12.017
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The objective of this study was to compare fly ash and activated carbon for their ability to remove nickel [Ni(II)] and zinc [Zn(II)] from an aqueous solution. The effects of contact time, pH, initial metal concentration and amount of adsorbent on the adsorption process at 20 +/- 2 degrees C were studied. Batch kinetic studies showed that an equilibrium time of 1 h was required for the adsorption of Ni(II) and Zn(II) on both adsorbents. The maximum metal removal was found to be dependent on solution pH (4.0 for Ni(II) and Zn(II)). With an increase in the concentrations of these metals, the adsorption of Ni(II) and Zn(II) decreased on both of the adsorbents. The effectiveness of fly ash as an adsorbent improved with increasing calcium (CaO) content. Adsorption data in the range of pH values (3.0-8.0) using Ni(II) concentration of 25 +/- 2 mg/L and Zn(II) concentration of 30 +/- 2 mg/L in solution were correlated using the linear forms of the Langmuir and Freundlich equations. The fly ash was found to be a metal adsorbent as effective as activated carbon. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:83 / 87
页数:5
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