Abstract
A new high-efficiency ternary composite photocatalyst (SnO2/SnS2/conjugated polyvinyl chloride derivative (CPVC)) was designed based on the hypothesis that any two of its components can constitute type-II heterojunction, and its three components should have synergistic effect on the enhancement of photoinduced charge separation. SnO2/SnS2/CPVC ternary composite was prepared adopting an easy-to-implement four-step synthesis method. Photoluminescence and electrochemical impedance spectra showed that SnO2/SnS2/CPVC is more efficient than SnO2/SnS2, SnS2/CPVC, SnO2/CPVC and SnS2 in the separation and transfer of photoinduced charges. Results from their photocatalytic reduction of Cr(VI) under visible-light irradiation indicated that SnO2/SnS2/CPVC has significantly higher visible-light photocatalytic activity than SnO2/SnS2, SnS2/CPVC, SnO2/CPVC, SnS2, CPVC and SnO2. Moreover, SnO2/SnS2/CPVC also demonstrated good photocatalytic reusability and stability. This study not only has developed a new high-activity visible-light photocatalyst (SnO2/SnS2/CPVC), but is also useful for the design of other new ternary composite photocatalysts with synergistically enhanced visible-light photocatalysis.
Published Version
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