Van Pham Viet, Truong Thao Kim, Le Hai Viet, Nguyen Hoang Thai, Tong Hien Duy, Cao Thi Minh
University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 700000, Vietnam.
Vietnam National University Ho Chi Minh City, Thu Duc, Ho Chi Minh City 700000, Vietnam.
Langmuir. 2022 Apr 5;38(13):4138-4146. doi: 10.1021/acs.langmuir.2c00371. Epub 2022 Mar 24.
Nitric oxide (NO) removal by photocatalytic oxidation over g-CN has achieved more efficient results. However, there is a concern about the high NO-to-NO conversion yield of products, which is not suitable for the photocatalytic NO reaction. In this study, we modify g-CN by WO nanoplates for the first time for photocatalytic NO oxidation over a WO/g-CN composite to enhance the green product selectivity under atmospheric conditions. The results indicate that the photocatalytic efficiency for NO removal by the WO/g-CN composite is drastically improved and achieves 52.5%, which is approximately 2.1 times higher than that of pure g-CN. Significantly, the green product (NO) selectivity of the WO/g-CN composite is 8.7 times higher than that of pure g-CN, and the selectivity remained high even after five cycles of photocatalytic tests. We also conclude that the enhanced green product selectivity of photocatalytic NO oxidation by the WO/g-CN composite is due to the separation and acceleration of the photogenerated charges of the WO/g-CN S-scheme heterojunction.
通过光催化氧化在g-CN上去除一氧化氮（NO）已取得更高效的成果。然而，人们担心产物中NO到NO的转化率过高，这不适用于光催化NO反应。在本研究中，我们首次用WO纳米片修饰g-CN，用于在WO/g-CN复合材料上进行光催化NO氧化，以提高大气条件下绿色产物的选择性。结果表明，WO/g-CN复合材料去除NO的光催化效率大幅提高，达到52.5%，约为纯g-CN的2.1倍。值得注意的是，WO/g-CN复合材料的绿色产物（NO）选择性比纯g-CN高8.7倍，并且即使在五个循环的光催化测试后，选择性仍保持较高水平。我们还得出结论，WO/g-CN复合材料光催化NO氧化增强的绿色产物选择性归因于WO/g-CN S型异质结光生电荷的分离和加速。
