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+ > 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.
Annadural
G
G
Department of Chemical Engineering, National Taiwan University, Taipei 106, Chinese Taiwan.
Juang
R S
RS
Lee
D J
DJ
D000327:Adsorption; D002482:Cellulose / Q000737:chemistry; D005638:Fruit; D006863:Hydrogen-Ion Concentration; D019216:Metals, Heavy / Q000737:chemistry* / Q000302:isolation & purification; D014873:Water Pollutants / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods
D019216:Metals, Heavy; D014873:Water Pollutants; D002482:Cellulose