惡臭是空氣污染中的一個問題，也是公眾最容易感覺到的問題。 二甲基二硫（DMDS）的低氣味閾值（7至12 ppb）會影響人體的呼吸和神經系統。 DMDS的人為來源是廢水處理廠，堆肥廠，精煉廠和食品廠等。
使用光催化氧化來降解DMDS是具有前途的方法，因其具成本低廉和環境友好等優點。此外，二氧化鈦由於其低成本，高穩定性和良好的光催化能力而成為最常用的光催化劑。然而其具有較寬的帶隙 (〜3.2 eV)，不利於在可見光下降解污染物。因此，在這項研究中，為了增加TiO2的可見光吸收，通過溶熱法在二氧化鈦中摻雜硫，氮和石墨烯來製備光催化劑。
XPS, FTIR和拉曼光譜結果表明，在合成rGO/S0.05N0.1TiO2複合材料時，引入含氧官能團會引起新的化學缺陷。 XRD，SEM和BET結果顯示，加入石墨烯片後，rGO / S0.05N0.1TiO2的晶粒尺寸減小；二氧化鈦顆粒附著在rGO的表面上並摻雜進rGO層之間從而促進比表面積的增加。就光催化活性而言，0.1 wt％rGO /S0.05N0.1TiO2複合材料具有最佳的光催化活性，但過量摻雜rGO則會降低其光催化活性，PL實驗中也應證其為電子電洞複合率最低之材料。在參數試驗中，DMDS的轉化率隨溫度升高而增加，DMDS進流濃度降低而增加，相對濕度降低及停留時間增加而增加。Langmuir-Hinshelwood 模型4 最適合本研究之反應動力，代表水蒸氣和DMDS具有競爭性吸附。根據 FTIR分析結果，發現DMDS降解會產生SO2, CO2, HCHO, CH3OOH, CH3OH, CO和MSA等。

Malodour is an issue in air pollution, and it is the most strongly felt problem with the public. The low odor threshold of dimethyl disulfide (DMDS) (7 to 12 ppb) can affect the human respiratory and nervous systems. Anthropogenic sources of DMDS are wastewater treatment plants, compost plants, refineries, and food plants.
Photocatalytic oxidation is a promising method of treating DMDS due to low cost and environmental friendliness. TiO2 is the most commonly used photocatalyst because of its cheapness, high stability and good photocatalytic ability. However, TiO2 has a wide band gap (~ 3.2 eV) and a higher recombination rate of photo-generated electron-hole pairs, which is not conducive to degradation of pollutants under visible light.
In this study, in order to increase the visible light absorption of TiO2, photocatalysts were prepared by doping sulfur dioxide, nitrogen, and graphene in TiO2 by solvothermal method. XPS, FTIR and Raman spectroscopy showed that, when synthesizing reduced graphene oxide (rGO) / S0.05N0.1TiO2 composite material, the introduction of oxygen-containing functional groups can cause new chemical defects. XRD, SEM, TEM and BET results show that after the graphene sheet is introduced, the grain size reduction of rGO/S0.05N0.1TiO2. The TiO2 particles are attached to the surface of rGO and interposed between the rGO layers, thereby promoting an increase in specific surface area. In the photocatalytic activity, the rGO /S0.05N0.1TiO2 composite doped with 0.1wt% rGO has the best photocatalytic activity, but excessive doping of rGO will decrease the photocatalytic activity. In PL analysis, it also shows the lowest recombination rate. In the parameter test, the conversion rate of DMDS increases with increasing temperature, decreasing DMDS concentration at the inlet, decreasing relative humidity and increasing residence time. Langmuir-Hinshelwood model 4 is best suited to the reaction kinetics of this study. The main oxidation products and byproducts of DMDS photodegradation are SO2, CO2, HCHO, CH3OOH, CH3OH, CO, and MSA.

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