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513428 
Journal Article 
Sorption of cadmium and zinc from aqueous solutions by zeolite 4A, zeolite 13X and bentonite 
Rao, GPC; Satyaveni, S; Ramesh, A; Seshaiah, K; Murthy, KSN; Choudary, NV 
2006 
Yes 
Journal of Environmental Management
ISSN: 0301-4797
EISSN: 1095-8630 
81 
3 
265-272 
English 
The sorption and desorption of cadmium and zinc on zeolite 4A, zeolite 13X and bentonite has been studied using batch sorption studies. Parameters such as equilibrium time, effect of pH and sorbent dose were studied. The sorbents exhibited good sorption potential for cadmium and zinc with a peak value at pH 6.0 and 6.5, respectively. The sorption followed the Freundlich sorption model. More than 70% sorption occurred within 20 min and equilibrium was attained at around 90 min for the three sorbents. The metals sorption by zeolite 4A was higher than that by zeolite 13X and bentonite. The desorption studies were carried out using NaCl solution and the effect of NaCl concentration on desorption was also studied. Maximum desorption of 76% for cadmium and 80% for zinc occurred with 10% NaCl. (c) 2006 Elsevier Ltd. All rights reserved. 
cadmium; zinc; sorption; zeolites; bentonite; metal removal; adsorption; water; lead; tuff