Pemanfaatan Kulit Udang (Penaues Monodon) sebagai Kitosan dan Turunannya untuk Menurunkan Konsentrasi Ion Logam Ni dan Cr dengan Ekstrasi Fasa Padat Sebagai Sumber Air Bersih

Abstract

The chitin used to produced chitosan in this study was isolated from prawn shells by wet chemistry. The percentage yileds of chitin were 30,8%. Chitosan was prepared by deacetylation of the chitin which produced 71,6%. A number of characterization of chitosan were carried out i.e. determination of degree of deacetylation, viscosity, molecular weight (Mv), humidity, ash content and infrared analysis. For the molecular weight determination, it was to be found 893.000 for chitosan. Chitosan was coated on silica gel of 45um particle size by socking technique for concentrations Ni2+ and Cr ions using solid phone extraction method on polypropylene column, and 5% chitosan coating was used. Chitosan and glutaraldehyde chitosan (GAK) were also coated to glass fibre filter disc of 47 mm diameter as support and used for sorption of metal ions. by solid phase extraction (SPE) technique. It was found that 16% chitosan coated filter disc gave the best soption-desorption of metal ions, whereas 21 % for glutaraldehyde chitosan. Optimum flow rate and pH were also determined. The ability of glass fibre filter disc coated with chitosan and glutaraldehyde chitosan as sorbent for solid phase extraction at the optimum conditions was tested by concentrating Ni2* and Cr3+ ions at various concentrations. Maximum sorption capacity was found to be 20 μg, whereas complete desorption (100% recovery) occur up to 4 ug for this Ni2+ and Cr+ ions respectively. For the glutaraldehyde chitosan coated filter disc, maximum sorption capacity of 40 ug and 20 μg and complete desorption up to 20 μg were found for this Ni and Cr3+ ions respectively.