Preparation of g-C3N4/ZnMoCdS hybrid heterojunction catalyst with outstanding nitrogen photofixation performance under visible light via hydrothermal post-treatment
Preparation of g-C3N4/ZnMoCdS hybrid heterojunction catalyst with outstanding nitrogen photofixation performance under visible light via hydrothermal post-treatment
复制标题
水热后处理制备可见光下具有优异氮光固定性能的g-C3N4/ZnMoCdS杂化异质结催化剂
DOI：
10.1039/c5dt04901f
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发表时间：
2016
影响因子：
4
通讯作者：
Fayun Li
中科院分区：
文献类型：
--
作者：
Qian Zhang;Shaozheng Hu;Zhiping Fan;Daosheng Liu;Yanfeng Zhao;Hongfei Ma;Fayun Li
Nitrogen fixation is the second most important chemical process in nature, next to photosynthesis. Herein, we report a novel g-C3N4/ZnMoCdS heterojunction photocatalyst with outstanding nitrogen photofixation ability under visible light prepared by hydrothermal post-treatment. The as-prepared ZnMoCdS is the ternary metal sulfide Zn0.12Mo0.12Cd0.9S1.14 with many sulfur vacancies, not a mixture of ZnS, MoS2 and CdS. Strong electronic coupling, as evidenced by the UV-Vis, XPS and EIS results, exists between two components in g-C3N4/ZnMoCdS heterojunction photocatalysts, leading to more effective separation of photogenerated electron–hole pairs and faster interfacial charge transfer. The sulfur vacancies on ternary metal sulfides not only serve as active sites to adsorb and activate N2 molecules but also promote interfacial charge transfer from the catalyst to N2 molecules, thus significantly improving their nitrogen photofixation ability. With an optimal ZnMoCdS mass percentage of 80%, the as-prepared heterojunction photocatalyst exhibits the highest NH4+ generation rate under visible light, which is 13.5-fold and .75-fold greater than those of individual g-C3N4 and ZnMoCdS, respectively.
