Adsorption of heavy metals from water using banana and orange peels

Liquid-phase adsorption removal of Cu2+, Co2+, Ni2+, Zn2+, and Pb2+ in the concentration range of 5-25 mg/L using low-cost banana and orange peel wastes was examined at 30 degrees C. Under comparable conditions, the amount of adsorption decreased in the order Pb2+ > Ni2+ > Zn2+ > Cu2+ >...

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Bibliographic Details
Published in:Water science and technology 2003, Vol.47 (1), p.185-190
Main Authors: ANNADURAL, G, JUANG, R. S, LEE, D. J
Format: Article
Language:English
Subjects:
Adsorbent materials
Adsorption
Applied sciences
Carbon dioxide
Cellulose
Cellulose - chemistry
Cobalt
Copper
Drinking water and swimming-pool water. Desalination
Exact sciences and technology
Fruit
Fruits
Heavy metals
Hydrogen-Ion Concentration
Industrial wastewaters
Lead
Mathematical models
Metals
Metals, Heavy - chemistry
Metals, Heavy - isolation & purification
peels
pH effects
Pollution
Removal
Trace levels
Wastes
Wastewaters
Water Pollutants - isolation & purification
Water Purification - methods
Water treatment and pollution
Zinc
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Summary:Liquid-phase adsorption removal of Cu2+, Co2+, Ni2+, Zn2+, and Pb2+ in the concentration range of 5-25 mg/L using low-cost banana and orange peel wastes was examined at 30 degrees C. Under comparable conditions, the amount of adsorption decreased in the order Pb2+ > Ni2+ > Zn2+ > Cu2+ > Co2+ for both adsorbents. The adsorption isotherms could be better described by the Freundlich equation. The amount of adsorption increased with increasing pH and reached a plateau at pH > 7, which was confirmed by the variations of zeta potentials. The application potential of such cellulose-based wastes for metal removal (up to 7.97 mg Pb2+ per gram of banana peel at pH 5.5) at trace levels appeared to be promising.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2003.0049