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Removal of copper from aqueous solutions by adsorption using modify Zalacca edulis peel modify

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Author(s): Chadrudee Sirilamduan1*, | Chakkrit Umpuch2,3 | Pairat Kaewsarn4

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 33;
Issue: 6;
Start page: 725;
Date: 2011;
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Keywords: biosorption | Cu2+ ions | chemical pre-treatment | fruit peel

ABSTRACT
The removal of Cu2+ ions by adsorption using biomass derived from Zalacca edulis peel was studied in a batch system.The effects of pH and chemical pre-treatment of the biomass by the use of CaCl2 with different thermal conditions and initialconcentrations were also determined. The results showed that chemical pre-treatment by CaCl2 enhanced the capacity of Cu2+ions biosorption. The equilibrium sorption data of untreated Zalacca edulis peel and Zalacca edulis peel pre-treated withCaCl2 were fitted well by both Langmuir and Freundlich isotherms equations. According to the Langmuir equation, the maximumuptake of Cu2+ ions by the use of Zalacca edulis peel pre-treated with CaCl2 was found to be 27.03 mg g-1 at pH 5. Therate of adsorption was found to conform to pseudo-second order kinetics with good correlation. The binding between heavymetal Cu2+ ions and chemically pre-treated biosorbent was confirmed by the use of scanning electron microscope combinedwith energy dispersive X-ray analysis and electron probe microanalyser.
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