期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 97, 期 -, 页码 6-13出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2011.11.010
关键词
Cadmium; Na-zeolitic tuff; Fe-zeolitic tuff; Sewage sludge; Adsorption
资金
- Universidad Autonoma del Estado de Mexico [2825/2009 U]
- CONACYT [131174Q, 170350]
In the present study the process of adsorption of cadmium from aqueous solutions using Na-zeolitic tuff, Fe-zeolitic tuff and carbonaceous material from pyrolyzed sewage sludge treated with HCl was investigated. The cadmium removal efficiency was studied as a function of contact time, adsorbate concentration, pH and adsorbent dose. The results showed that removal of cadmium was best described by the Langmuir-Freundlich isotherm. The kinetic experimental results were best described by the pseudo-first order model. The results indicate that the adsorption mechanism is physical and chemical sorption on heterogeneous materials. The maximum retention of cadmium was at pH around 6.0 for the materials. In kinetic studies, the Na and Fe modified zeolitic tuffs showed similar sorption capacities for cadmium and they were higher than the capacity found for carbonaceous material. (C) 2011 Elsevier Ltd. All rights reserved.
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