| Summary: | 碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 106 === The purpose of this study was to use bismuth oxide (Bi2O3) and potassium hydrogen iodide (KH(IO3)2) to modify titanium dioxide (TiO2), and to investigate the photocatalytic degradation of RhB using a fixed molar ratio of modified catalyst. The photocatalyst was prepared by uniformly mixing potassium hydrogen iodide, bismuth oxide and titanium dioxide on a glass carrier. Comparing the effect of oxidizing RhB under hydrogen peroxide with different molar concentrations under the same natural sunlight conditions. The operating conditions of the photocatalytic experiment are divided into natural sunlight at different seasons and different times in one day. The best degradation effect of the catalyst carrier for degradation of RhB was sunlight at noon in summer, with a degradation rate of 66.87 %, while the addition of hydrogen peroxide was 69.85%. The two methods are similar, but after the comparison of the calculation of operating costs. Because the reusability of the catalyst is higher, its cumulative cost (NTD per m3) is lower (NTD40) than the batch addition of (15mM) hydrogen peroxide degradation RhB (NTD393). In the experiment under the sunlight at different times, the photodegradation efficiency of the I/Bi2O3/TiO2 catalyst slide was the best at 11:00 (66.87 %). The sunlight intensity began to weaken, and finally decreased to 28.54 % at 17:00. The photocatalytic performance of the I/Bi2O3/TiO2 composite photocatalyst was compared with that of the pure TiO2. The results showed that the I/Bi2O3/TiO2 photocatalytic was degraded (66.87%), and it’s better than pure TiO2 (59.50%), showing that the modified catalyst increases natural sunlight availability and achieves better degradation rates. Using the linear simulation of the five-repetition durability experiment, it is concluded that the number of catalyst reusables is about 17 times, indicating that the photocatalyst prepared in this study has good reusability. The COD chemical oxygen demand analysis results show that the chemical oxygen demand of the discharged water can be effectively reduced by 50% to achieve the effect of reducing the impact.
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