近年來，溫室氣體導致嚴重的全球氣候變化異常，例如溫室效應和極端氣候，其中主要原因之一為二氧化碳排放過度。在減少二氧化碳排放的各種技術中，將二氧化碳轉化為化學品或燃料的光催化技術被認為是最有潛力的處理方式之一。因此，開發高穩定性，高效率和低成本的光觸媒具重要性。考慮到目前大多數關於二氧化碳光還原技術都是在常壓下進行，因此，本研究嘗試探討高壓下光催化還原二氧化碳。利用微波輔助成功改質graphite-like carbon nitride (g-C3N4, GCN)及製備出3%rGO/MCN/Bi2WO6-Y% (Y = 25, 50, 75, 100)，合成之光觸媒將透過XRD、FTIR、SEM、HR-TEM、UV-vis、PL、XPS、以及比表面積分析儀進行特性分析，並應用於光催化二氧化碳還原成一氧化碳。首先，經由在氨水溶液下微波水熱60分鐘後，不同溫度條件下，GCN的結構以及特性皆有明顯變化。而所獲得之淡黃色樣品，亦即modified GCN (MCN-X, X = 130, 150, 170, 190°C)。其中又以MCN-130擁有最佳的光催化活性，經過12小時的反應，其CO產率為4.22 μmol/g。接著，為了後續複合材料的製備，MCN130在氬氣氣氛下以600°C鍛燒2小時(MCN130-600)，並以微波輔助水熱方法合成出具異質結構之3%rGO/MCN/Bi2WO6-Y% (Y = 25, 50, 75, 100)，其中又以3%rGO/MCN/Bi2WO6-100% 擁有最佳光催化活性 (CO 產率 = 13.5 μmol/g)，因為相較於其他比例的觸媒，它具有較窄的能隙、較高的表面積，有利於光還原二氧化碳。此外，在本研究中亦討論不同的壓力條件下對於3%rGO/MCN/Bi2WO6-100%光催化效率之影響。

In recent years, the greenhouses gases (i.e., excessive CO2 emission) led to serious global climate change problems, e.g., greenhouse effect and extreme climate. Among various techniques for reduction of CO2 emissions, the photocatalytic conversion of CO2 into chemicals or fuels is considered one of the promising strategies to address this problem. Thus, it is important to explore a photocatalyst with stability, high efficiency, and low cost. In addition, considering most of the research about CO2 photoconversion was conducted at normal pressure, the effects of high pressure on photoreduction of CO2 are investigated in this study. In this work, photocatalytic reduction of CO2 to CO using modified GCN (denoted as MCN) and 3%rGO/MCN/Bi2WO6-Y% (Y = 25, 50, 75, 100) which are prepared via a microwave-assisted route is reported. The physical-chemical properties and morphology of the photocatalysts are characterized by various analytic tools and spectroscopies, including XRD, XPS, TEM, SEM, PL, FTIR, and UV-visible spectroscopy. For MCN samples, structure and morphology of the GCN can easily be modified by a microwave-assisted hydrothermal method in an ammonia solution at different temperatures (130, 150, 170, 190) for 60 min. The obtained pale-yellow samples, MCN-X are used as photocatalysts in the CO2 photoreduction under the light irradiation. Among the samples, the MCN130 sample shows the highest CO yield of 4.22 μmol/g. For the heterostructured catalysts, 3%rGO/MCN/Bi2WO6-Y% (Y = 25, 50, 75, 100) samples are also successfully synthesized through a microwave system. In the photocatalytic CO2 reduction experiments, it was found that the 3%rGO/MCN/Bi2WO6-100% possesses the superior activity (CO yield = 13.5 μmol/g) within 12 h. The reason may be due to the 3%rGO/MCN/Bi2WO6-100% possesses a smaller band gap, and higher surface area compared to other 3%rGO/MCN/Bi2WO6-Y% (Y= 25, 50, 75). In addition, the effects of different operating pressures on the photoreduction of CO2 catalyzed by 3%rGO/MCN/Bi2WO6-100% are also discussed.

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