PEMBUATAN MEMBRAN MAKROPORI KITOSAN PEKTIN TERTAUT SILANG GLUTRALDEHIDA SEBAGAI ADSORBEN BIRU METILEN; SYNTHESIS OF CHITOSAN PECTIN MACROPOROUS MEMBRANE CROSS-LINKED BY GLUTARALDEHYDE AS ADSORBENT FOR METHYLENE BLUE
Praseto, Elvina Apriliani, Dwi Siswanta
2015 | Skripsi | FMIPA UGMA research about synthesis chitosan pectin macroporous membrane cross-linked glutraldehyde as adsorbent for methylene blue has been done. The macroporous membrane has been obtained by dissolving pectin in water followed by added chitosan and acetic acid. Then added silica and glutaraldehyde, then evaporated at 70 °C. The membranes were characterized by FTIR and SEM. Then also studied the influence of time, pH, the amount of porogen, the concentration of methylene blue, adsorption kinetics, adsorption isotherms pattern, adsorption capacity and adsorption energy. Results of FTIR analysis showed membrane before silica released led to a sharp peak absorption 1095 cm-1 which is vibration of Si-O-Si; functional groups of OH, Si-C and Si-Cl also appears at wave number 3433, 794 , 462 cm-1. Meanwhile, the membrane macropore after release of silica not rediscovered vibration of Si-O-Si at 1095 cm-1. The optimum conditions occur at the time of 60 minutes, at pH 7 (neutral), the amount of porogen 100%, and methylene blue concentration is 250 mg L-1. The results showed that the adsorption followed the pseudo second order reaction kinetics with the Langmuir isotherm pattern. The maximum adsorption capacity value by macropores chitosan membrane pectin was 114 mg g-1 and the adsorption energy was 25.1 kJ/mol. Desorption can occur with the use of 1 M NaCl in 120 minutes by following pseudo second-order kinetic adsorption and desorption rate constant of 1.78 × 10-3 g mol-1 min-1.
Kata Kunci : macroporous membrane; methylene blue; porogen; adsorption desorption kinetics
