TY - JFULL AU - Rabindra Prasad Dhakal and Tatsuya Oshima and Yoshinari Baba PY - 2009/9/ TI - Synthesis of Unconventional Materials Using Chitosan and Crown Ether for Selective Removal of Precious Metal Ions T2 - International Journal of Chemical and Molecular Engineering SP - 387 EP - 392 VL - 3 SN - 1307-6892 UR - https://publications.waset.org/pdf/9951 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 32, 2009 N2 - The polyfunctional and highly reactive bio-polymer, the chitosan was first regioselectively converted into dialkylated chitosan using dimsyl anionic solution(NaH in DMSO) and bromodecane after protecting amino groups by phthalic anhydride. The dibenzo-18-crown-6-ether, on the other hand, was converted into its carbonyl derivatives via Duff reaction prior to incorporate into chitosan by Schiff base formation. Thus formed diformylated dibenzo-18-crown-6-ether was condensed with lipophilic chitosan to prepare the novel solvent extraction reagent. The products were characterized mainly by IR and 1H-NMR. Hence, the multidentate crown ether-embedded polyfunctional bio-material was tested for extraction of Pd(II) and Pt(IV) in aqueous solution. ER -