Tuyển tập các báo cáo nghiên cứu khoa học trên tạp chí khoa học vật lý quốc tế đề tài: Immobilization of Dithizone onto Chitin Isolated from Prawn Seawater Shells (P. merguensis) and its Preliminary Study for the Adsorption of Cd(II) Ion | Journal of Physical Science Vol. 19 1 63-78 2008 63 Immobilization of Dithizone onto Chitin Isolated from Prawn Seawater Shells P. merguensis and its Preliminary Study for the Adsorption of Cd II Ion Mudasir Ginanjar Raharjo Iqmal Tahir and Endang Tri Wahyuni Chemistry Department Faculty of Mathematics and Natural Sciences Gadjah Mada University Sekip Utara . Box Bls. 21 Yogyakarta 55281 Indonesia Corresponding author mudasir@ Abstract Immobilization of dithizone onto biopolymer chitin isolated from prawn seawater shells P. merguensis to enhance the selectivity and ability of chitin in adsorbing heavy metal cadmium Cd has been conducted. The study includes isolation of chitin from the prawn seawater immobilization of dithizone onto chitin and adsorption of Cd II ions. Several parameters influencing immobilization as well as Cd II adsorption were optimized. Results of the study showed that high purity chitin polymer can be isolated from the prawn seawater shells P. merguensis . The best immobilization conditions of dithizone onto chitin are achieved when the reaction is carried out for 6 h at 700 C in toluene medium. In general the ability of chitin polymer in adsorbing Cd II ion increases after immobilization of dithizone onto chitin. The optimum conditions for Cd II adsorption are at pH 6 for chitin-dithizone and pH 7 for chitin using g of adsorbent. Keywords immobilization dithizone chitin cadmium II adsorption 1. INTRODUCTION Aqueous effluents emanating from many industries usually contain dissolved heavy metals such as Cd lead Pb copper Cu and mercury Hg .1 If these industrial liquid wastes are discharged without prior-treatment they may have an adverse impact on the Higher awareness of the ecological effects of toxic metals and their accummulation through food chains has prompted a demand for purification of industrial wastewaters prior to their discharge into the natural water bodies and thus increasing interest has been shown in
