AgPO-based photocatalysts have been deeply studied in environmental remediation; however, two problems limited their further application: photocorrosion and quenching effect by in-situ generated HO. To addressed these two questions simultaneously, Fe(MoO) was coupled with AgPO to construct Z-scheme Fe(MoO)/Ag/AgPO heterojunction driven by internal-electric-field. The rhodamine B degradation rate of heterojunction was 254 and 7.0 times higher than those of Fe(MoO) and AgPO, respectively. The outstanding photoactivity was due to the high visible-light harvest, low interface resistance, high separation efficiency of charge carriers, long lifetime of hole (h) and electron (e), well-preserved oxidation potential of h, and especially photocatalytic produced HO inside the system. The in-situ generated HO was fully activated to be OH on the Fe(MoO) surface via a Fenton reaction, leading to the elimination of quenching effect on h and e, and generation of more OH. Additionally, in Z-scheme heterojunction, e transferred from AgPO to Fe(MoO), avoiding the accumulation on AgPO surface, and hence suppressing the photocorrosion. As a result, 91.2% of degradation efficiency remained after 5 cycles. This paper provides a new method to simultaneously increase the degradation rate by utilizing the in-situ generated HO and improve the stability of AgPO via constructing a Z-scheme heterojunction.
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| http://dx.doi.org/10.1016/j.jcis.2021.08.134 | DOI Listing |
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