| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 106 === In this study, we were used In2O3 and V2O5 to prepare InVO4 photocatalyst powder by solid state method. The decolorization was degraded by Cyanine N-5R acid dye solution, and the photocatalytic activity of the powder under illumination was measured. The experiment is divided into two different directions: different sintering temperatures and different raw material mole ratios. And observe whether the powder has different photocatalytic activity under visible light, and add PVP and PVA to try to reduce the agglomeration. XRD analysis shows that most of the raw materials react to InVO4-III when the sintering temperature is above 600oC. When sintering temperature lower than 600oC the powder retains V2O5 and In2O3. From the lower five sintering temperatures, it can be seen that the product produced two types of InVO4, namely InVO4-I and InVO4-III. The powder sintered at 500oC contains is more InVO4-I. When the sintering temperature is higher than 600oC, almost all InVO4-I is converted to InVO4-III.
Using UV-Vis. to observe the degradation results, it was found that the lower sintering temperature, the less complete the reaction. The more V2O5, the better the degradation effect. This is the result because V2O5 reacts with the dye to affect the measurement of UV-Vis. After cleaning the powder, changing the ratio of V2O5 and In2O3, adding PVP and PVA, it was found that the powder reacted at 650oC does not contain V2O5 and is most suitable for photocatalytic degradation of dyes.
Compared to sintering different proportions of powder at 650oC, It is found that the powder with the core-shell structure of In2O3 and V2O5 with a molar ratio of 1.5 to 1 has better degradation effect than the one with no core-shell structure of In2O3 and V2O5. The core-shell structure is helpful. Photocatalytic efficiency. The addition of PVP and PVA can reduce the phenomenon of agglomeration, but the effect of PVA is better. The best photocatalytic capacity parameter is In2O3: V2O5 = 1.5:1 mol% and PVA is sintered at 650oC for 12 hours.
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