IMMOBILIZATION OF TIO2/SIO2/GSS COMPOSITE PHOTOCATALYST ONTO SUPPORTING MATERIALS BY DIPPING METHOD AND EFFECTIVENESS ON PHOTOCATALYTIC ACTIVITY
Keywords:
TiO, Substrate materials, Photocatalyst, Sol-gel method, Visible light degradationAbstract
The synthesis of TiO2/SiO2/GSs by using the sol-gel method was done with the mass ratio of Titanium:(GSs) as 1:0.07 and calcined at 450. The synthesized powder was immobilized onto the sponge substrate by using the dipping method with Polyvinyl alcohol as a binder prepared with the various thickness of the sponge substrate of 0.3, 0.5, 0.8, and 1 cm. The microstructure was investigated utilizing Scanning Electron Microscope (SEM) and phase composition utilizing x-ray Diffraction Spectrometer (XRD). The results of XRD pattern of TiO2/SiO2/GSs show the presence of anatase phase and rutile (83.82%: 16.18%) and the average crystal size is 34.26 nm. The SEM photograph of synthesized powder gave a brief picture of the structure pattern of TiO2/SiO2/GSs follow the layer pattern of GSs while the dipped samples show the tendency of powder powder-coated along the surface of fibers of the sponge. The degradation of methylene blue was analyzed under four kinds of light emission (dark, UV lamp, LED lamp, and solar light). The results show that there are no differences in photocatalytic activity under a UV lamp and solar light. The degradation of MB with the various thickness of the sponge substrate gave different results, on the first 60 min, a sample with thickness 1 cm has the highest degradation of 95% while at 3 h of experiments, all samples gave a similar result. However, the thickness of the sponge substrate in the degradation process has no significant effect occurs to the photocatalytic activity under solar light.
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