氮化碳是一個新興且不含金屬的可見光光催化劑。在本研究中，我們使用尿素當作合成氮化碳的前驅物並且參雜碳奈米材料以形成複合光催化劑。我們比較各種碳奈米材料的參雜對氮化碳增強光反應性的影響。碳奈米材料包含富勒烯，單壁碳奈米碳管，多壁碳奈米碳管，氧化石墨烯，還原氧化石墨烯。在本研究中，氮化碳參雜還原氧化石墨烯在45分鐘可見光照射下可將雙酚A去除~99%。在電化學阻抗分析實驗中，我們發現氮化碳和還原氧化石墨烯的複合材料比其他碳奈米物質與氮化碳複合物有最低的電阻約2500 Ω這使得它減輕電子電洞再結合導致光觸媒有良好光催化性質。在添加自由基清除劑實驗中發現主要去除BPA是超氧自由基的產生。此外，我們還評估了同時降解雙酚A和六價鉻的光催化效率，在此實驗中發現雙酚A在30分鐘內完全移除，六價鉻在60分鐘內可被還原50%。

關鍵字:光催化、還原氧化石墨烯、氮化碳。

Graphitic carbon nitride (GCN) is an emerging, metal-free, and visible light photocatalyst. In this work, we use urea as precursor to fabricate GCN (the sample is termed UGCN) and dope with carbonaceous nanomaterials (CNMs) to form a composite photocatalyst. We compare across these various CNMs in terms of their efficacies in enhancing the photoreactivity of GCN. CNMs involve fullerene, single-wall carbon nanotube (SWCNT), multi-wall carbon nanotube (MWCNT), graphene oxide (GO), reduce graphene oxide (rGO). In this work, rGO and UGCN composite photocatalyst has the best photocatalytic efficiency, BPA as a pollutant model, and is ~99% removed in 45 min of visible light irradiation by composite of rGO and UGCN. In electrochemical impedance spectroscopy analysis (EIS), composite of rGO and UGCN have the smallest charge transfer resistance (2,500 Ω) than the other composite of CNMs and UGCN. The introduced CNMs shuttle the photogenerated electron from UGCN, thereby alleviating the electron-hole recombination, resulting composite of rGO and UGCN have excellent photocatalytic reaction. In adding free radical scavengers’ experiment, superoxide radical (O2•−) was produced and played a major role in the removal of BPA. Therefore, we also evaluate photocatalytic efficiency that simultaneously transforms BPA and Cr(VI) (i.e., the binary system). In this work, BPA is completely removed in 30 min and Cr(VI) is 50% reduced in 60 min.

Keywords： Photocatalysis, reduced graphene oxide, graphic carbon nitride.

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