Abstract
The paper deals with a study of Zn2+ ions adsorption by native and modified fine-cut pea (Pisumsativum) pod shells. The sorption material under study was treated using 1%, 2% and 3% NaOH or H2SO4 solutions. Isotherms of Zn2+ ions adsorption by native and treated pea pod shells were plotted and calculated using the Langmuir, Freundlich, Tyomkin, and Dubinin-Radushkevich models. It was determined that the isotherm of zinc ions adsorption by native shells of pea pods is most accurately described by the Langmuir model, by modified shells – by the Freundlich model. According to the values of the adsorption energy and the Gibbs energy, the adsorption is a physical process. The paper provides data on the degree of crystallinity, elemental analysis, and IR spectra of native and treated pea pods.
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