SYNTHESIS AND SURFACE MODIFICATION OF BIVO4 PHOTOCATALYST AND ITS ACTIVITY ON TEREPHTHALIC ACID HYDROXYLATION REACTION
The chemical industry requires a large amount of energy, especially for endothermic reactions that require high temperatures. Non-renewable energy sources such as hydrocarbon fuel and coals are still the main sources of energy to fulfill the energy consumptions. Meanwhile, the renewable energy sourc...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/52149 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | The chemical industry requires a large amount of energy, especially for endothermic reactions that require high temperatures. Non-renewable energy sources such as hydrocarbon fuel and coals are still the main sources of energy to fulfill the energy consumptions. Meanwhile, the renewable energy sources such as sunlight were not widely used. Photocatalyst materials are promizing in order to use solar energy in chemical reactions, especially for redox reactions. BiVO4 is one of the best photocatalyst candidates for the oxidation reaction of organic compounds under visible light, because of its small bandgap (2,4 eV). However, its perfomances are still limited by charge recombination. In this work, monoclinic scheelite BiVO4 samples were synthesized by means of hydrothermal method. BiVO4 surface modification was carried out by the impregnation of Fe3+, Ni2+ and Cu2+ ions onto the BiVO4 surface in order to inhibit the charge recombination. X-ray Diffraction (XRD) measurement and UV-Diffused Reflectance Spectroscopy (UV-DRS) characterization showed an increase in crystallite size, and the crystal grow along the b-axis, while lattice parameters and bandgap are not affected. These indicate that the dopants did not penetrate into the lattice but attached on the surface.
Photocatalytic performances were evaluated against the hydroxylation reaction of terephthalic acid to produce 2-hydroxy terephthalic acid under UV (? = 253 nm, 20 W), sunlight and visible light (? = 380 ? 680 nm, 18 W). Under UV exposure, BiVO4 produced less 2-hydroxy terephthalic acid than the reaction without photocatalyst. Meanwhile, BiVO4 succeeded in enhancing the production of 2- hydroxy terephthalic acid compared to the reaction without photocatalyst. Surface modification has not significantly improved the BiVO4 performance. Meanwhile Cu2+ and Ni2+ could be a good candidates for improving BiVO4 performance under UV and visible light, respectively. |
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