Add time:08/05/2019         Source:sciencedirect.com

Dark red ZnFe2O4 (ZFO) nanoparticles (NPs) of ˜9 nm size and pale yellow WO3 nanowire bundles (NWBs) with high porosity were prepared by hydrothermal reactions, respectively, and coupled to form novel ZFO/WO3 heterojunctions. Tiny ZFO NPs and highly porous WO3 NWBs successfully formed intimate heterojunctions, facilitating charge transport at their interfaces. Under visible-light, ZFO/WO3 composites demonstrated outstanding catalytic activities for decomposing isopropyl alcohol (IPA) in the gas phase and salicylic acid (SA) in aqueous solution. In particular, the amount of CO2 evolved in 2 h during decomposition of IPA was 24.7 ppmv, which was 3.0 times that produced using typical nitrogen-doped TiO2 (N-TiO2). Moreover, its degradation rate constant of SA in the presence of ZFO/WO3 was ˜7 times that of N-TiO2. It was determined that •OH and •O2- radicals were the major active species responsible for oxidation reactions, suggesting that the photocatalytic reactions of ZFO/WO3 occurred via Z-scheme mechanism.

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