112 The Factors on Removal of Zinc Cation from Aqueous Solution by Bentonite
adsorbent material for the removal of zinc ions from
waste solutions. The results indicate that removal of Zn2+
by Na-exchanged bentonite is more effective than by
Ca-bentonite. Compared to the published data in the
same field, it is found to be in agreement with most of
them.
The adsorption experiments were conducted under
different conditions. The extent of zinc adsorption in-
creased with increase in pH, temperature, stirring speed,
contact time and decrease in particle size, initial concen-
tration, liquid-to-solid ratio.
In a complex system, the simultaneous presence of
Cr6+ and Zn2+ in aqueous solutions reduced the equilib-
rium adsorption capacity of bentonite adsorbents, while
there was no effect in the simultaneous aqueous solution
of Pb2+ and Zn2+.
The adsorption of Zn2+ ions onto bentonite and Na-
exchanged bentonite can be expressed with Freundlich
type sorption isotherms.
5. Acknowledgements
This research was financially supported by National
Natural Science Foundation of China (Grant No.41072
031, 41072119) and Natural Science Foundation of He-
bei Province (Grant No. D2009000833).
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