Abstract
Nitrogen-doped reduced graphene oxide (NRG)/SnO2/SnS2 ternary photocatalyst was fabricated by hydrothermal methods in two steps. XRD, Raman, XPS, X-ray elemental mapping, TEM and HRTEM analyses verified the preparation of NRG/SnO2/SnS2 ternary nanocomposite. The photocurrent response, photoluminescence, electrochemical impedance and electron spin resonance measurements indicated that the three components had synergistic effects in decreasing the carrier recombination of NRG/SnO2/SnS2. For photocatalytic reduction of aqueous Cr(VI) under visible-light irradiation, the photocatalytic efficiency of NRG/SnO2/SnS2 was higher than those found for SnS2, binary composites (NRG/SnO2, NRG/SnS2 and SnO2/SnS2), and other reported ternary photocatalysts (g-C3N4/SnS2/SnO2, SnS2-BiFeO3/rGO, NRG/SnS2/PANI and SnS2/SnO2/CPVC). Moreover, NRG/SnO2/SnS2 also exhibited a high efficiency in photocatalytic treatment of the diluted black chromium electroplating solution. Based on the results of comparative photocatalytic experiments in N2 or air atmosphere, and with or without O2•– trapping agent (p-Benzoquinone), it was inferred that Cr(VI) was reduced dominantly by photogenerated electrons of NRG/SnO2/SnS2.
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