Abstract
A new approach for constructing amorphous/crystalline heterophase W-Zn(Ti)O photocatalyst was develpoed via calcination topological transformation of the self-sacrificial WO42−-pillared ZnTi-LDH (WO4-LDH) precursor together with in-situ W-doping. The amorphous/crystalline heterophase formation could expose enriched active sites, which promoted the transfer and separation of photogenerated e−-h+ pairs. Density functional theory (DFT) calculations further verified that in-situ W-doping regulated the electronic structure and reduced bandgap energy, which made the transport of photogenerated carriers more rapid. Benefiting from the construction of the amorphous/crystalline heterophase, the W-Zn(Ti)O had suitable photo-oxidation/reduction activities, achieving 99.7% removal rate for Cr(VI) reduction, 78.1% for TC oxidation, and simultaneous Cr(VI) reduction (78.0% removal) and TC oxidation (63.2% removal) for 120 min under visible-light. This work provides a new idea for the design of amorphous/crystalline heterophase nanomaterials.
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