Design and preparation of SnO2/SnS2/conjugated polyvinyl chloride derivative ternary composite with enhanced visible-light photocatalytic activity. (October 2019) - Su, Yan
Graphical abstract: Highlights: Design and preparation of SnO2 /SnS2 /CPVC ternary composite as photocatalyst. SnO2 /SnS2 /CPVC shows synergistically enhanced photoinduced charge separation. SnO2 /SnS2 /CPVC has far higher visible-light photocatalytic activity. SnO2 /SnS2 /CPVC shows good photocatalytic reusability and stability. Useful for the development of new efficient ternary composite photocatalysts. 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.