Sintesis Fe2O3-Montmorilonit Dan Aplikasinya Sebagai Fotokatalis Untuk Degradasi Zat Pewarna Congo Red
ABSTRACT: The preparation of
Fe2O3-montmorillonite and it's application as a catalyst for congo red dye
photodegradation has been carried out. Fe2O3-montmorillonite was prepared by
mixing the iron complexes pillaring agent and montmorillonite. The product was
calcined at 250 oC for 5 hours. Montmorillonite and calcined product was
analyzed by X-ray diffractometry (X-RD), infrared spectrophotometry (FTIR),
gas sorption analyser, X-ray
fluorescense (X-RF) and UV/Vis diffuse reflectance spektrophotometry (UV-DRS).
Fe2O3-montmorilonite then was used as a catalyst on congo red dye
photodegrdation by UV-illuminating a mixture of 50 mg Fe2O3-montmorillonite and
25 mL congo red 10-4M at 365 nm at various illuminating times. Adsorption of
congo red on Fe2O3-montmorillonite and montmorillonite was also performed as a
comparison.
Result of X-RD analysis showed that the 001 reflection of Fe2O3-montmorillonite was not detected that probably indicating the
formation of house of card stucture and this result was supported also by the
analysis result of distribution of pores and SEM photography result. Results of
the XRF analysis showed that iron content increased from 5.21 % (w/w) in montmorillonite to 25.12
% (w/w) in Fe2O3-montmorillonite. UV- DRS analysis showed the increament of
band gap energy from 3.69 eV in the iron oxide bulk to 3.8 eV in
Fe2O3-montmorillonite. Specific surface area of the montmorillonite also
increased significantly from 69,71 m2/g to 126,49 m2/g and total pores volume
increased from 50.70x10-3 mL/Å/g to
107.89x10-3 mL/Å/g, respectively. Photodegradation of congo red using
Fe2O3-montmorillonite caused the decreament of congo red concentration up to
90.22 % on UV illumination for 60
minutes. Adsorption of congo red on Fe2O3-montmorillonite reached 84.4% and
on montmorillonite was 75.15 %.
Penulis: Karna Wijaya, Iqmal
Tahir and Nanik Haryanti
Kode Jurnal: jpkimiadd050021
