二硫二甲烷(dimethyl disulfide, DMDS)是具有臭味的揮發性硫化物，高濃度會刺激呼吸道、眼睛和皮膚，大量暴露可能導致意識喪失。主要來源為化石燃料的燃燒、石化工業廠、高科技廠去光阻製程、污水廠、掩埋場中含硫有機物質厭氧分解、牛皮紙漿業、皮革業、煉油廠。
本研究旨在以溶膠凝膠法製備TiO2光觸媒，藉由S摻雜來提高TiO2光觸媒在可見光下降解二硫二甲烷之光催化能力，以連續流實驗比較不同S摻雜比例TiO2光觸媒之光催化活性，選出光催化能力最佳之光觸媒再進行操作參數實驗，並藉由各種輔助實驗，如UV-Visible、XRD、BET、XPS、FTIR等精密儀器來分析光觸媒吸光度、晶相變化、粒徑分佈、比表面積、化學鍵結、官能基等物化性質，藉以探討與光催化效果之關連性。
研究結果顯示，S摻雜TiO2光觸媒表面形成微黃色，並且由各種精密儀器分析結果得到S摻雜TiO2光觸媒粒徑變小，比表面積增加，可見光波段吸收能力大幅提升，表面形成酸性位置。而由二硫二甲烷之光催化實驗結果顯示S摻雜TiO2光觸媒可提升在可見光下降解二硫二甲烷效率；在日光燈光源照射下，在不同S摻雜比例之光觸媒中，以S/Ti = 5 mol%有最佳二硫二甲烷光催化降解速率。從操作參數實驗中可得知S/Ti = 5 mol%光觸媒於反應溫度25 °C，相對濕度60 %，二硫二甲烷濃度25 ppm時有最佳光催化降解二硫二甲烷效率。

In this study, TiO2 was prepared by sol-gel method and doped with S (S/TiO2). The photocatalytic decomposition rate of dimethyl disulfide (DMDS) under visible light condition was expected to increase via doping. Additionally, the physical and chemical properties of the photocatalysts such as adsorbance spectrum, crystallinity, particle size, surface area, and chemical bonding, measured by UV-Visible, XRD, BET and XPS, respectively, were obtained for a better understanding to the reaction of dimethyl disulfide decomposition rate.
The UV-Visible spectra analysis indicates that the absorption in the visible region of S/TiO2 increased. By doping with S, the particle size obviously decreased and the surface area of S/TiO2 was bigger than pure TiO2.
The photocatalytic degradation of dimethyl disulfide under fluorescent light was further studied using S/TiO2. The experimental results showed that S/TiO2 = 5 mol% achieved the best performance. We found that under 25 °C, relative humidity 60 %, dimethyl disulfide concentration 25 ppm is the best operation condition.

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