A new approach to enhance photocatalytic nitrogen fixation performance via phosphate-bridge: a case study of SiW12/K-C3N4

被引：105

作者：

Xiao, Cailin ^{[1
]}

Zhang, Ling ^{[1
]}

Wang, Kefu ^{[1
]}

Wang, Haipeng ^{[1
]}

Zhou, Yuanyi ^{[1
]}

Wang, Wenzhong ^{[1
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, 1295 Dingxi Rd, Shanghai 200050, Peoples R China

来源：

APPLIED CATALYSIS B-ENVIRONMENTAL | 2018年 / 239卷

基金：

中国国家自然科学基金;

关键词：

K-C3N4; POM; Phosphate-bridged; Nitrogen fixation; GRAPHITIC CARBON NITRIDE; H2O2 PRODUCTION ABILITY; HYDROGEN EVOLUTION; EFFICIENT PHOTOCATALYSTS; ORGANIC POLLUTANTS; PLASMA TREATMENT; WATER OXIDATION; AMMONIA; G-C3N4; DEGRADATION;

D O I：

10.1016/j.apcatb.2018.08.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Photocatalytic nitrogen fixation, as a low-cost and promising technology, needs efforts to explore the photo catalyst 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-C3N4 nano composites show excellent photocatalytic nitrogen fixation efficiency (353.2 mu M g(-1) h(-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-C3N4 and SiW12, and the increased oxidation capacity of water by bridging SiW12. Moreover, K doping and bridging SiW12 improves 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.

引用

页码：260 / 267

页数：8

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