Abstract
The isotherms and kinetic adsorption models for lead (II) in the mining pit water at Bangka on Shrimp Shells Waste Chitosan (Sw-Chi) was studied. The Sw-Chi from the dried shrimp (generally Penaeus semisulcatus species) waste were extracted via deproteinization, demineralization, decolorization and deacetylation steps at previous work. The chitin deacetylation values of Sw-Chi was 88.98% determined through FTIR spectra using baseline method. The initial lead (Pb (II)) concentration in this study was 0.41 ppm from open-pit water in Sungailiat district, Bangka Island. The performance of Sw-Chi adsorption on lead in the pit water with the ratio of 1:500 (w/v) in variation contact time while stirring at room temperature. The adsorption isotherms and kinetic models for lead in the mining pit water at Bangka follows the pseudo-second-order (PSO) and the Freundlich isotherm (F-Isoth) model. The adsorption mechanism may be due to Van der Waals forces and formed lead multilayer onto Sw-Chi surfaces.
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