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Enhanced visible light photoreduction of aqueous Cr(VI) by Ag/Bi 4 O 7 /g-C 3 N 4 nanosheets ternary metal/non-metal Z-scheme heterojunction.

In this paper, we successfully constructed a ternary metal/non-metal nanomaterial which can synergize Z-scheme heterojunction and plasmonic metal/semiconductor for enhancing visible light photoreduction of aqueous Cr(VI). The as-formed ternary metal/non-metal nanomaterial was composed of g-C3 N4 nanosheets mutual modified by Ag nanoparticles and Bi4 O7 . In the ternary nanomaterial, g-C3 N4 nanosheets and Bi4 O7 fabricated Z-scheme heterojunction, g-C3 N4 nanosheets and Ag nanoparticles formed plasmonic metal/semiconductor system, synchronously. The photodeposition experiments were designed to indirect demonstrate the Z-scheme heterojunction via photocatalytic oxidation and reduction deposition reactions, AgNO3 was used as the electron acceptor and Pb(NO3 )2 as the electron donor, photocatalytic reduction product and oxidation product were selectively deposited on g-C3 N4 nanosheets and Bi4 O7 , respectively, revealing the Z-scheme heterojunction was definite formed. In addition, X-ray photoelectron spectroscopy (XPS), photoluminescence (PL), UV-vis absorption, and Fourier-transform infrared spectroscopy (FTIR) were studied to indicate that the plasmonic metal/semiconductor system was existent in the ternary nanomaterial. The visible light photoreduction of ternary Ag/Bi4 O7 /g-C3 N4 nanosheets was evaluated by photoreducing aqueous Cr(VI). The photoreduction results show that the ternary Ag/Bi4 O7 /g-C3 N4 nanosheets is much higher than the pristine bulk g-C3 N4 and g-C3 N4 nanosheets.

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