TiO2-SiO2 HASIL SINTESIS DARI ABU DAUN BAMBU DAN PREKURSOR TITANIUM (IV) BUTOKSIDA SEBAGAI FOTOKATALIS

Abstract

Preparation of photocatalyst material, TiO2-SiO2 using Bamboo leaves as silica source has been investigated. Silica was extracted from Bamboo’s leaves ash and the composite formation was conducted using Titanium (IV) butoxide precursors through the method of sol-gel. Purpose of this research is degradation of methylene blue using TiO2-SiO2 photocatalyst and study the effect of light, time irradiation and varied concentration. Prepared materials were characterized by using SEM, FTIR, XRD, SAA and DR UV-Vis. From SEM characterization shows that the addition of SiO2 will alter the morphology of TiO2 photocatalyst. FTIR analysis results that in peaks 3411,92 cm-1 stretching vibration OH owned Si-OH bonds, and absorption 1640,65 cm-1 stretching vibration Si-OH bending, 1635,87 cm-1 (Ti-OH), 794,93 cm-1 (Si-O-Si) and 965 cm-1 (Ti-O-Si). The XRD results indicated the formation of materials has is anatase phases (2θ= 25) of titanium dioxide in the composite form with a size of 7,93 nm. This results is supported by SAA characterization indicated that the photocatalyst have a mesopore materials. The pore volume of the TiO2-SiO2 composite is 0.392 and the pore radius is 284.45 Å. The bandgap energy of TiO2-SiO2 photocatalyst is 3,57 eV. Photocatalytic activity of the materials TiO2-SiO2 was tested in methylene blue photodegradation. The results showed the significant photoactivity as indicated by the degradation rate of methylene blue at varied treatments. As the methylene blue concentration increases the resulting photoactivity decreases. The optimum concentration used in methylene blue degradation is 10-3 M.