PEMBUATAN FILM KOMPOSIT KOMPLEKS POLIELEKTROLIT KITOSAN/? -KARAGINAN DAN PEMANFAATANNYA SEBAGAI ADSORBEN METILEN BIRU; SYNTHESIS OF CHITOSAN/? -CARRAGEENAN POLYELECTROLYTE COMPLEX COMPOSITE FILM AND ITS UTILIZATION AS ADSORBENT FOR METHYLENE BLUE

LIANA RIZKI OKTARI, Dwi Siswanta

2014 | Disertasi | PROGRAM STUDI S-2 KIMIA

The chitosan/?carrageenan polyelectrolyte complex (PEC) composite films had been synthesized and tested as adsorbents for the removal of methylene blue (MB). The films were prepared by mixing chitosan and ?karaginan in aqueous solution. Films were then characterized using Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM). Adsorption capabilities were studied by varying the chitosan and ?carrageenan composition ratios, pH, time contacts and concentrations of MB while the desorptions were conducted at acidic solutions. The reusabilityof adsorbent for MB adsorption after desorption was also studied and the films were used to adsorp MB twice. All these treatments were analyzed using UVVis spectrophotometer. The synthesis film was succeed as shown in FTIR results and the surface morphology of film was changed before and after adsorption also after desorption as shown in SEM results. The MB uptake of the film with 40:60 ratios of chitosan and ?carrageenan was the highest in neutral pH conditions. Pseudosecondorder equation predicted well the kinetics of adsorption with the adsorption achieved within 15 min. The film showed the maximum adsorption capacity of MB at 425.35 mg/g and the adsorption followed Langmuir isotherm model. This adsorbent was also able to be reused for the adsorption of MB, after desorption process using distilled water at pH 2. Therefore, the use of chitosan/?carrageenan PEC composite film in this work proved to be promising adsorbent for removing methylene blue from aqueous solutions.

Kata Kunci : metilen biru; adsorpsi; film komposit PEC kitosan/?-karaginan