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Synthesis of Full-Spectrum-Response Cu₂(OH)PO₄/g-C₃N₄ Photocatalyst with Outstanding Photocatalytic H₂O₂ Production Performance via a “Two Channel Route”

Author:
Wang, Xiwei, Han, Zheng, Yu, Lihua, Liu, Chuntao, Liu, Yifu, Wu, Guang
Source:
ACS sustainable chemistry & engineering 2018 v.6 no.11 pp. 14542-14553
ISSN:
2168-0485
Subject:
carbon nitride, electrons, hydrogen peroxide, oxygen, photocatalysis, photocatalysts
Abstract:
Near infrared, one of the most important parts of the solar spectrum, is seldom used in photocatalytic reactions. In this work, a full-spectrum-response Cu₂(OH)PO₄/g-C₃N₄ photocatalyst with outstanding photocatalytic H₂O₂ production performance was synthesized. On one hand, as a light absorber from UV to NIR, Cu₂(OH)PO₄ can form photogenerated electrons to recombine the holes in g-C₃N₄ through a “Z-scheme” mechanism. On the other hand, Cu₂(OH)PO₄ can adsorb O₂ molecules, which is significantly important in the photocatalytic process. The Cu₂(OH)PO₄/g-C₃N₄ heterojunction catalyst with a Cu₂(OH)PO₄ of 20 wt % shows the H₂O₂ concentration of 7.2 mmol·L–¹, over 13 and 31.3 times higher than that of neat g-C₃N₄ and Cu₂(OH)PO₄, respectively. The “two channel route” is proposed for this reaction system.
Agid:
6199379