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Issue 16, 2017
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Synergistic effect of CoPi-hole and Cu(ii)-electron cocatalysts for enhanced photocatalytic activity and photoinduced stability of Ag3PO4

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Abstract

Recently, Ag3PO4 has been demonstrated to be a new kind of material with high visible-light photocatalytic performance for the decomposition of various organic species. To further improve the photocatalytic activity of Ag3PO4, hole cocatalyst modification is a promising approach via the rapid transfer of photogenerated holes for effective oxidation reaction. In this work, Co-Pi as a hole cocatalyst was successfully modified on the Ag3PO4 surface by an in situ photodeposition method (referred to as CoPi/Ag3PO4). The results showed that the photocatalytic activity of CoPi/Ag3PO4 was greatly improved compared with that of Ag3PO4. Especially, CoPi/Ag3PO4 (0.3 wt%) reached the highest photocatalytic rate constant (k = 9.2 × 10−2 min−1), a value larger than that of Ag3PO4 (k = 1.4 × 10−2 min−1) by a factor of 6.6. However, it was further found that more accumulated electrons resulted in an obvious deactivation of Ag3PO4 due to the rapid transfer of holes by the Co-Pi cocatalyst, resulting in an obviously decreased photocatalytic performance during repeated tests. To enhance the performance stability of CoPi/Ag3PO4, the Cu(II) electron-cocatalyst was further loaded onto its surface to prepare the CoPi–Cu(II)/Ag3PO4 photocatalyst. The resultant CoPi–Cu(II)/Ag3PO4 not only indicated a much higher photocatalytic activity than CoPi/Ag3PO4, but also maintained the excellent stability, which was ascribed to the synergistic effect of Co-Pi as a hole cocatalyst and Cu(II) as an electron cocatalyst. This work may provide new insight for the development of highly stable and efficient photocatalysts for the degradation of organic pollutants.

Graphical abstract: Synergistic effect of CoPi-hole and Cu(ii)-electron cocatalysts for enhanced photocatalytic activity and photoinduced stability of Ag3PO4

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Supplementary files

Article information


Submitted
16 Feb 2017
Accepted
23 Mar 2017
First published
24 Mar 2017

Phys. Chem. Chem. Phys., 2017,19, 10309-10316
Article type
Paper

Synergistic effect of CoPi-hole and Cu(II)-electron cocatalysts for enhanced photocatalytic activity and photoinduced stability of Ag3PO4

P. Wang, S. Xu, Y. Xia, X. Wang, H. Yu and J. Yu, Phys. Chem. Chem. Phys., 2017, 19, 10309
DOI: 10.1039/C7CP01043E

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