Electronic Theses and Dissertation

Modifikasi kitosan magnetik berikat silang pedge dengan asparagin untuk menyerap metilen biru telah dilakukan. modifikasi dilakukan dengan variasi komposisi asparagin dimana komposisi kitosan, pedge dan pasir besi dibuat tetap. komposit terbaik di uji daya serapnya terhadap larutan metilen biru dengan memvariasikan waktu, ph dan konsentrasi larutan metilen biru. berdasarkan hasil penelitian, kondisi adsorpsi optimum diperoleh pada ph 10 dengan waktu kontak 30 menit. isoterm adsorpsi kitosan-asparagin magnetik berikat silang pedge mengikuti isoterm langmuir dan freundlich dengan kapasitas serapan 37,453mg/g. karakterisasi ftir mengkonfirmasi terbantuknya komposit kitosan-asparagin magnetik berikat silang pedge. hasil sem menunjukkan permukaan adsorben pada kitosan halus sedangkan kitosan-asparagin magnetik berikat silang pedge menunjukkan permukaan adsorben lebih kasar. hasil xrd mennujukkan terjadinya penurunan kristalinitas kitosan setelah dimodifikasi

Modification of magnetic PEDGE crosslinked chitosan with asparagine to adsorb methylene blue has been conducted. The modification was performed out by varying the composition of asparagine where the composition of chitosan, PEDGE and iron sand was made fixed. The best composite was tested for its adsorption capacity of methylene blue solution by varying the time, pH and concentration of methylene blue solution. Based on results, the optimum adsorption conditions were obtained at pH 10 with a contact time of 30 minutes. The magnetic PEDGE crosslinked chitosan-asparagine adsorption isotherm follows the Langmuir and Freundlich isotherm with an adsorption capacity of 37,453 mg/g. FT-IR characterization confirmed the formation of a magnetic PEDGE crosslinked chitosan-asparagine composite. The SEM results showed that the surface of the adsorbent on chitosan was smooth, while the magnetic chitosan-asparagine crosslinked PEDGE showed a rougher adsorbent surface. The XRD results showed a decrease in chitosan crystallinity after modification.