ADSORPSI DAN DESORPSI BIRU METILEN PADA MEMBRAN MAKROPORI PEC KITOSAN/KARAGINAN TERTAUT SILANG GLUTARALDEHIDA DENGAN SiO2 SEBAGAI POROGEN; ADSORPTION AND DESORPTION OF METHYLENE BLUE USING CHITOSAN/CARRAGEENAN PEC MACROPOROUS MEMBRANE CROSSLINKED BY GLUTARALDEHYDE USING SiO2 AS POROGEN

Fajriyanto, Dian Eka, Dwi Siswanta

2015 | Skripsi | FMIPA

A study about adsorption and desorption of methylene blue using PEC chitosan/carrageenan crosslinked glutaraldehyde using SiO2 as porogen has been done. Macroporous membrane has been obtained by dissolving carrageenan in water at 60 ?C followed by addition of chitosan, acetic acid, SiO2 powder, and glutaraldehyde, respectively. After the evaporating of solution at 75 ?C, the membrane was imemersed by NaOH and evaporated for 2 hours at the same temperature. The obtained macroporous membrane was characterized by FTIR and SEM. The effect of compositions of chitosan and carrageenan, time contacts, pH, concentrations of methylene blue, kinetics of adsorption-desorption, and adsorption isoterm has also been studied systematically. The results of FTIR analyses showed that the release of SiO2 has been succesfully done and the characterization using SEM showed that there is a change in the surface on non-porogen membrane and macroporous membranes. The highest methylene blue adsorption capacity was found in membrane with 30:70 composition of chitosan to carrageenan. The adsorption kinetics followed the pseudo-second-order kinetics with the adsorption equilibrium achieved within 30 min. The maximum adsorption capacity of methylene blue is 169.5 mg/g and the adsorption followed Langmuir isoterm model. The maximum desorption of methylene blue is obtained by using NaCl 1.0 M and it follows pseudo-second-order kinetics.

Kata Kunci : methylene blue; adsorption; desorption; SiO2; chitosan/ carrageenan PEC; macroporous membrane