揮發性有機汙染物(VOCs)排放問題長期以來受到各國重視，其中含硫揮發性有機汙染物(SVOCs)因其較難以降解之特性而形造成處理上的難題。做為SVOCs其中一種的化合物，二甲基二硫(DMDS)具有高毒性、刺激性及腐蝕性。因其低閾值的性質，在極低濃度即會聞到強烈難聞的臭味。光催化技術利用產生於光觸媒表面的自由基與污染物進行反應，以達到降解汙染物的目的。二氧化鈦因為具有良好的光催化活性，因此在許多研究之中皆使用二氧化鈦作為光觸媒材料。然而，二氧化鈦存在幾項缺點，包括過高的電子-電洞再結合率、較大的能隙，以及觸媒毒化等問題。在本次研究中將使用溶熱法摻雜鐵及石墨烯於二氧化鈦製成複合奈米光觸媒材料以提升光催化活性。另外，一系列特性分析如XRD, BET, SEM, PL等也會進行以了解光觸媒性質。經過分析，SEM及TEM的結果顯示光觸媒表面的形態及分布狀況。XRD及Raman的結果顯示摻雜鐵於光觸媒材料之後並不會影響二氧化鈦的晶格結構。UV-Vis的結果可得知鐵和石墨烯的摻雜可以有效提升可見光的吸收能力，同時降低能隙。而從PL的圖譜上可看到摻雜鐵的光觸媒材料可達到延遲電子和電洞對再結合的效果。在光催化活性試驗中，因為低能隙的特性，使得摻雜鐵及石墨烯的光觸媒材料獲得較好的DMDS去除效果。其中又以摻雜0.1wt%還原態氧化石墨烯及1%鐵之二氧化鈦複合光觸媒具有最佳的DMDS降解能力。在參數試驗中，DMDS初始濃度提高造成轉化率降低，可能是因為光觸媒表面的活性點位有限。溫度提高造成轉化率上升，可能是因為溫度的提升有助於增加分子間的碰撞頻率。停留時間提高造成轉化率上升，可能是因為DMDS有更高的機率得以吸附在光觸媒表面並與自由基進行反應。相對溼度提高造成轉化率降低，原因可能來自於DMDS與水蒸氣之間的競爭吸附。

Volatile organic compounds (VOCs) have great importance with the increasingly strict requirement of supervision for controlling them to be emitted into the atmosphere. Among them, sulfur-containing volatile organic compounds (SVOCs) are particularly difficult to be effectively removed. Dimethyl disulfide (DMDS) is one of SVOCs with high toxicity, irritating and strong corrosive. DMDS has a strong and unpleasant odor and can be detected at a very low concentration. As a feasible method, Photocatalysis refers to the photogeneration of strong oxidizing and reducing agents at the surface of the photocatalyst that act to destroy pollutants, especially volatile organic pollutants. TiO2 has been widely studied and used to eliminate organic pollutants in wastewater and air due to its high photocatalytic activity. However, bare TiO2 suffers from several disadvantages like rapid recombination of photo-generated electron–hole pairs, limited light absorption, large band gap, and easy deactivation. In this study, iron and reduced graphene oxide (rGO) were introduced to dope into the TiO2 photocatalyst material by a solvothermal method to enhance photocatalytic activity. In addition, characteristic analyses such as XRD, BET, SEM, PL, etc. were conducted. The SEM and TEM results demonstrate the morphology of photocatalysts. The XRD and Raman results reveal that Fe doping doesn’t affect the formation of TiO2 lattice structure. The UV-visible absorption spectra indicate that doping of Fe and rGO can improve visible light absorption intensity and reduce the band gap, while PL spectra reveal that doping of Fe reduces the recombination rate of electron and hole. Regarding photocatalytic activity, the results show that the doping of Fe and rGO can enhance the removal of DMDS, which is due to the lower band gap. Among all photocatalysts, TiO2 doped with 0.1wt% rGO and 1% Fe has the best photodegradation performance. In parameter test, the conversion of DMDS decreases when inlet concentration of DMDS increases, which is due to the limit active sites on the photocatalysts surface. The conversion of DMDS increases with the increasing temperature. It suggests that higher temperature results in an increasing collision frequency. The conversion of DMDS increases with the increasing residence time. It reveals that DMDS molecules have more chances to be adsorbed on the photocatalysts surface and react with radicals. The conversion of DMDS decreases when the relative humidity increases. It indicates that water could cause competitive adsorption with DMDS molecules.

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