SINTESIS DAN KARAKTERISASI KOMPOSIT KITOSAN-ZEOLIT TERAKTIVASI BASA-Fe SEBAGAI SISTEM LEPAS LAMBAT Fe(III); SYNTHESIS AND CHARACTERIZATION OF CHITOSAN-ALKALINE ACTIVATED ZEOLITE –Fe COMPOSITES AS SLOW RELEASE SYSTEM OF Fe(III)

RATU FAZLIA INDA RAHMAYANI, Yateman Arryanto

2014 | Disertasi | PROGRAM STUDI S2 ILMU KIMIA

Preparation of an iron (III) slow release materials using chitosan and alkaline activated zeolite and evaluation of their release behaviour in the 0.33 M citric acid solution have been done. The composites were prepared by mixing chitosan gel, alkaline activated zeolite, and FeSO4 solution. Then the mixture was dripped into NaOH solution. Composite synthesis was carried out by varying the consentration of NaOH for zeolite activation. The structure of composite was characterized using infrared spectrophotometer and X-Ray diffractometer. The surface morphology of composite was analyzed using SEM and the thermal stabilities were analyzed using TGA. The result of composite, with variation in mixing methode, releasing evaluation didn’t show any difference in releasing behaviour, so that the composite made by mixing the zeolite and Fe previously then chitosan (composite C) was selected as the representatif of the other composites. Evaluation of release in the 0.33 M citric acid for composite from consentration variation of NaOH showed that the release order of Fe(III) is the composite C (6 M) > composite C (4 M) > Composite C (2 M) > composite C (0 M) with values of k are 0.021 mg/g; 0.016 mg/g; 0,014 mg/g; 0.011 mg/g respectively. The SEM images of composite showed rought surface morphology due to the presence of zeolite-Fe covered by chitosan framework. It is also observed the presence of zeolite-Fe that is not covered by chitosan polymer on the surface. Indicating that chitosan could not coat the zeolite-Fe effectively due to its lower mass. The testing of composite release behavior in the 0.33 M citric acid solution showed that Fe(III) ions were released fastly from the composite as increasing the NaOH consentration used zeolite activation.

Kata Kunci : kitosan; zeolit teraktivasi basa; komposit; lepas lambat Fe(III)