A SYNTHESIS OF ZEOLITE FROM NATURAL CLAY AND RICE HUSK ASH TO LOWER THE BAND GAP OF TITANIA
2022
Syukri, Syukri | Fikri, Ahmad | Safni, Safni | Norita Tetra, Olly
In this study, we have utilized clay from Pariaman, Indonesia enriched with silica from rice husk ash to produce zeolite through a hydrothermal process. The resulting zeolite is then composited with a typical the most common semiconductor photocatalyst, an anatase titanium oxide, to increase the semiconductor efficiency in terms of particle distribution and activation light sources. From X-Ray Fluorescence (XRF) measurement, it can be seen that the Si/Al mole ratio in the clay has been successfully increased from 1.8 to 2.0. This data is strengthened by the results of analysis with X-Ray Diffraction (XRD) which shows the formation of zeolites of several types consisting of zeolite faujasite, P1, sodalite, X, and nu-6. When the synthesized zeolite is mixed with titania anatase, a composite is formed as evidenced by FTIR analysis with the appearance of Si-O-Si and Si-O-Al absorption bands for zeolite and Ti-O-Ti from titania. This zeolite has been shown to reduce the bandgap energy of titanium oxide after the two materials have been composited. Measurements with Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS) showed that the TiO2-anatase band gap decreased by about 20%, from 3.20 to 2.56 eV which theoretically allows the composite to be used under visible light exposure.
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