Meng Zeyong, Ma Yifan, Chen Bangfu, Li Yuhan, Ma Hao, Zhu Bicheng, Dong Fan
Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, China.
Engineering Research Center for Waste Oil Recovery Technology and Equipment, Ministry of Education, Chongqing Key Laboratory of Catalysis and New Environmental Materials, Chongqing Technology and Business University, Chongqing 400067, China; South China University of Technology, School of Materials Science and Engineering, Guangzhou, 510641, China.
J Colloid Interface Sci. 2024 Jun 15;664:433-443. doi: 10.1016/j.jcis.2024.02.203. Epub 2024 Mar 8.
The generation of hazardous intermediates during the process of photocatalytic nitric oxide (NO) oxidation presents a tough issue. Herein, a one-step microwave strategy was employed to introduce oxygen vacancies (OVs) into zinc oxide-zinc stannate (ZnO-ZnSnO) heterojunction, resulting in an improvement in the photocatalytic efficiency for NO removal. The construction ZnO-ZnSnO heterojunction with the OVs (ZSO-3) owns a significant contribution towards highly efficient electron transfer efficiency (99.7%), which renders ZSO-3 to exert a deep oxidation of NO-to-nitrate (NO) rather than NO-to-nitrite (NO) or NO-to-nitrogen dioxide (NO). Based on the solid supports of experimental and simulated calculations, it can be found that OVs play an irreplaceable role in activating small molecules such as NO and O. Moreover, the enhanced adsorption capacity of small molecules, which guarantees the high yield of active radical due to the formation of S-scheme heterojunction. This work illuminates a novel viewpoint on one-step in-situ route to prepare ZnSnO-based heterojunction photocatalyst with deep oxidation ability of NO-to-NO.
光催化氧化一氧化氮（NO）过程中有害中间体的产生是一个棘手的问题。在此，采用一步微波策略将氧空位（OVs）引入氧化锌-锡酸锌（ZnO-ZnSnO）异质结中，从而提高了光催化去除NO的效率。具有OVs的ZnO-ZnSnO异质结（ZSO-3）对高效电子转移效率（99.7%）有显著贡献，这使得ZSO-3能够将NO深度氧化为硝酸盐（NO₃⁻），而不是氧化为亚硝酸盐（NO₂⁻）或二氧化氮（NO₂）。基于实验和模拟计算的坚实支撑，可以发现OVs在活化诸如NO和O等小分子方面发挥着不可替代的作用。此外，小分子吸附能力的增强，由于形成S型异质结而保证了活性自由基的高产率。这项工作为一步原位制备具有NO深度氧化为NO₃⁻能力的ZnSnO基异质结光催化剂提供了新的视角。
