EFEK TAUT SILANG GLUTARALDEHIDA PADA KOMPLEKS POLIELEKTROLIT KITOSAN-KARBOKSIMETIL SELULOSA TERHADAP ADSORPSI BIRU METILEN; THE EFFECT OF GLUTARALDEHYDE CROSSLINKED OF CHITOSAN-CARBOXYMETHYL CELLULOSE POLYELECTROLYTE COMPLEX IN THE METHYLENE BLUE ADSORPTION

Fajarwati, Febi Indah, Eko Sugiharto

2015 | Disertasi | FMIPA

The chitosan-carboxymethyl cellulose polyelectrolyte complex film and chitosan-carboxymethyl cellulose crosslinked with glutaraldehyde (Chitosan- CMC-GA) have been synthesized. This films was used to study the effect of glutaraldehyde as crosslinker towards mechanical properties and adsorptiondesorption process of methylene blue. The films were characterized with FTIR, SEM and Tensile Strength Tester. The stability of films in the acid-base medium and the ability to absorp water were tested. The adsorption activities of films towards methylene blue also was studied including the effect of films composition, time, pH, concentration of methylene blue, adsorption kinetics and adsorption isotherm. The desorption activities of films has been conducted in NaCl solution. The FTIR results showed that the film have been successfully synthesized and the surface morphology of film was changed after glutaraldehyde addition as shown in SEM image. The mechanical properties of film increased as glutaraldehyde increased and has stability at pH 3. The optimum condition of methylene blue adsorption occurs at pH 8 with a concentration of 125 mg/L. Optimum adsorption of film 7:3 (ratios volume CMC:kitosan) was 3.15x10-4 mol/g at 45 minutes and the percentage of desorption was 52.95%. The optimum of mol ratios of chitosan:GA was 6:1 with adsorption capacity at 2.68x10-4 mol/g at 30 minutes and desorption percentage was 42.23%. Adsorption kinetics followed the pseudo second order with Langmuir isotherm.

Kata Kunci : Chitosan; CMC; glutaraldehyde; adsorpstion-desorption; methylene blue.