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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/9934

Title: Sorption characteristics of zinc and iron by natural zeolite and bentonite
Authors: E. M. Khaled
A. Sh. Sallam
Issue Date: 2003
Publisher: Microporous and Mesoporous Materials
Abstract: Natural zeolites have unique cation-exchange capacity, adsorption - desorption and hydration-dehydration properties that enhance their use as slow release fertilizers. This research was undertaken to characterize the ability of five natural zeolites and bentonite minerals to adsorb and release zinc and iron. Results indicated that different amounts of zinc were sorbed by zeolites particularly at higher zinc concentrations. Langmuir adsorption equation was used to describe Zn sorption with its constants varying between the studied minerals. Chabazite mineral has the highest Zn sorption capacity and binding energy compared with other minerals. The ability for Zn sorption were in the following order chabazite > analcime > clinoptilolite1 > bentonite > clinoptilolit2 > phillipsite. DTPA extractable Zn decreased with the increase in successive DTPA extractions. All sorbed zinc was extracted by DTPA in most zeolite species after 4 successive extraction while only 50 % was readily extractable from chabazite. Iron sorption data follow the S-type isotherm and the results were described by Fruendlich adsorption model. Variable percentage of extractable Fe from sorbed Fe rang from 21.4 – 88.2 %. Iron activity ratio (Feox/Fed) of sorbed Fe indicated the dominance of amorphous or poorly crystalline phase with zeolites and crystalline iron oxide phases with bentonite. Results suggest that natural zeolites particularly chabazite and bentonite minerals have high potential for Zn & Fe sorption with high capacity for availability and slow release fertilizer.
URI: http://hdl.handle.net/123456789/9934
Appears in Collections:College of Foods And Agricultural Science

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