A new approach to enhance photocatalytic nitrogen fixation performance via phosphate-bridge: a case study of SiW12/K-C3N4
A new approach to enhance photocatalytic nitrogen fixation performance via phosphate-bridge: a case study of SiW12/K-C3N4
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DOI：
10.1016/j.apcatb.2018.08.012
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Cailin Xiao;Ling Zhang;Kefu Wang;Haipeng Wang;Yuanyi Zhou;Wenzhong Wang
中科院分区：
文献类型：
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作者：
Cailin Xiao;Ling Zhang;Kefu Wang;Haipeng Wang;Yuanyi Zhou;Wenzhong Wang
光催化固氮作为一种低成本、有前途的技术，需要努力探索高活性、高稳定性的光催化剂。在这项研究中，聚氧乙烯酸盐（POM）簇[H4 SiO 40 W12]（SiW 12）已成功地共价结合KOH改性的石墨碳氮化物纳米片（K-C3 N4）通过磷酸盐桥接策略。以POM为助催化剂，SiW 12/K-C3 N4纳米复合材料在光照条件下表现出优异的光催化固氮效率（353.2 μM g−1h−1）。这是由于K-C3 N4与SiW 12之间形成了“磷酸桥”键，提高了载流子的分离效率，同时SiW 12桥连提高了水的氧化能力。此外，K掺杂和桥联SiW 12提高了对氮的吸附和活化，有利于氮还原为氨。本工作为设计和合成具有优异性能的纳米复合光催化固氮材料提供了一条可行的途径。
Photocatalytic nitrogen fixation, as a low-cost and promising technology, needs efforts to explore the photocatalyst with high activity and stability. In this study, the polyoxometalate (POM) cluster of [H4SiO40W12] (SiW12) has been successfully covalently combined with the KOH-modified graphitic carbon nitride nanosheets (K-C3N4) through the phosphate-bridged strategy. With POM acting as the co-catalyst, SiW12/K-C3N4nanocomposites show excellent photocatalytic nitrogen fixation efficiency (353.2 μM g−1h−1) in water under light-irradiation. It can be ascribed to the enhanced separation efficiency of charge carriers through the formation of “phosphate-bridged” bonds between K-C3N4and SiW12, and the increased oxidation capacity of water by bridging SiW12. Moreover, K doping and bridging SiW12improves the adsorption and activation of nitrogen, which can be conductive to the reduction of nitrogen to ammonia. This work provides a feasible route to design and synthesize nanocomposite materials with exceptional performance for photocatalytic nitrogen fixation.