PEMBUATAN MANIK KOMPOSIT KITOSAN-PEKTIN TERTAUT SILANG ASAM SULFAT SEBAGAI ADSORBEN INDIGO CARMINE
FADLAN MUIN, Drs. Dwi Siswanta, M.Eng.,P.hD dan Dr. Suyanta, M.Si
2016 | Tesis | S2 Ilmu KimiaTelah dilakukan pembuatan manik komposit kitosan pektin tertaut silang asam sulfat untuk adsorpsi desorpsi indigo carmine. Pembuatan manik dilakukan dengan mencampurkan kitosan pektin dalam medium berair. Manik yang telah terbentuk dikarakterisasi dengan FTIR, SEM, uji kestabilan dalam medium asam basa dan uji penyerapan air. Uji aktivitas adsorpsi manik kitosan pektin meliputi variasi perbandingan komposisi kitosan pektin, waktu kontak optimum, pH, variasi konsentrasi indigo carmine, kinetika adsorpsi dan isoterm adsorpsi serta dilakukan uji desorpsi manik pada larutan NaCl dan pH asam basa. Hasil karakterisasi FTIR dan SEM menunjukkan bahwa manik berhasil dibuat dengan adanya perubahan pada permukaan manik. Pada proses adsorpsi, manik kitosan pektin dengan perbandingan komposisi 90:10 menunjukkan kemampuan adsorpsi tertinggi terhadap larutan indigo carmine. Waktu kontak adsorpsi optimum diperoleh pada menit ke 420 sebesar 60,20 mg/g. Sifat mekanik manik meningkat dengan adanya tautan silang oleh asam sulfat dan manik stabil pada kondisi pH asam. Kondisi pH optimum untuk adsorpsi indigo carmine diperoleh pada pH 5, yaitu 56,41 mg/g. Variasi konsentrasi diperoleh 88,44 mg/g pada konsentrasi 600 mg/L. Kinetika adsorpsi indigo carmine mengikuti reaksi orde dua semu dan isoterm adsorpsi indigocarmine sesuai dengan model Langmuir. Presentase desorpsi dengan NaCl 1 M dan 0,1 M diperoleh 16,03% dan 9,95%, sedangkan dengan pH 2 dan pH 12 diperoleh 6,71% dan 1,80%. Kata kunci: Kitosan, pektin, asam sulfat, adsorpsi-desorpsi, indigo carmine
The research of preparation of composite chitosan-pectin beads crosslinked with sulphuric acid for adsorption-desorption process of indigo carmine has been conducted. Beads were prepared by mixing chitosan pectin in an aqueous medium and characterized by FTIR, SEM, stability test in alkaline and acid medium, and water absorption test. Adsorption activity test of pectin chitosan beads was including variations of ratio chitosan and pectin, optimum contact time, pH, variation concentration of indigo carmine, adsorption kinetics, adsorption isotherm and beads desorption test in NaCl and acid base condition. FTIR and SEM results indicated that the beads were successfully synthesized by the changes of the beads surface. Adsorption of chitosan-pectin beads in ratio 90:10 showed the highest adsorption capability of the indigo carmine solution. The optimum adsorption contact time was obtained in minutes 420 by 60.20 mg/g. The mechanical properties of beads increased by the cross-linked with sulfuric acid and beads were stable at acidic conditions. The optimum adsorption pH of indigo carmine was 5 with the capacity 56.41 mg/g. The result of the concentration variation was 88.44 mg/g at a concentration of 600 mg/L. Indigo carmine adsorption kinetics follows the pseudo second order reaction and the isotherms adsorption were correlated with the model of Langmuir. Adsorption percentage of NaCl 1 and 0.1 M were 16.03% and 9.95%, while at pH 2 and 12 were 6,71% and 1,80%. Keywords: Chitosan, pectin, sulphuric acid, adsorption-desorption, indigo carmine
Kata Kunci : Kitosan, pektin, asam sulfat, adsorpsi-desorpsi, indigo carmine/Chitosan, pectin, sulphuric acid, adsorption-desorption, indigo carmine
