Abstract
The effect of deproteinization temperature on chitosan extraction process from shrimp shells waste used variation of temperature: 30, 60 and 90°C was studied. The results shown that the degree of deacetylation of chitosan (DD) decreased with increasing deproteinization temperature. This is probably due to excess polymerization reaction when the deproteinization temperature increases, thereby destroying the chitin structure. The highest chitosan DD achieved was up to 79.72% at temperature deproteinization of 30°C and the occurrence of deacetylation structurally demonstrated by the Fourier transform infrared characterization. The chitosan adsorption for zinc metal ions in Bangka post tin mining water shown that the systems of adsorption follow the pseudo second order kinetic model. Based on the equation of kinetics adsorption shown that the increase of chitosan DD causes the adsorption rate and maximum adsorption capacity increased. The increase of chitosan DD which is an indicator of the transformation of chitin into chitosan represents an increase in the number of amine groups which have a stronger metal ion adsorption. The highest of adsorption rate coefficient and maximum adsorption capacity was up to 1.215 g mg−1 min−1 and 0.15 mg g−1 respectively achieved at temperature deproteinization of 30°C.
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