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Unique multiple heterojunction of Pt-BiOBr/TiO_2 nanotube arrays(Pt-BiOBr/TNTAs) was achived by successively loading both Pt nanoparticles(NPs) and BiOBr nanoflkes(NFs) on surface of ordered and spaced TiO_2 nanotubes(NTs) using anodization followed by solvothermal and sequential chemical bath deposition(S-CBD) method. The fabricated Pt-Bi OBr/TNTAs were fully characterized, and the photocatalytic(PC) activity and stability of PtBiOBr/TNTAs toward degradation of methyl orange(MO) under visible-light irradiation(λ>400 nm) were evaluated. The results reveal that multiple heterostructures of Pt/TiO_2, Pt/BiOBr and BiOBr/TiO_2 are constructed among TNTAs substrate, Pt NPs and BiOBr NFs, and the hybrid Pt-BiOBr/TNTAs catalyst exhibits remarkable visible-light PC activity, favourable reusability and long-term stability. The combined effect of several factors may contribute to the remarkable PC performance, including strong visible-light absorption by both Pt NPs and BiOBr NFs, lower recombination rate of photo-generated electrons and holes attributed to the multiple heterojunction, microstructures for facile light injection and adsorption as well as efficient mass transport, and larger specific surface area for enhancing light absorption, increasing the effective contact area between the absorbed dye molecules and catalyst and benefiting the molecule transport of reactants or products.
Unique multiple heterojunction of Pt-BiOBr / TiO 2 nanotube arrays (Pt-BiOBr / TNTAs) was achived by loaded loading both Pt nanoparticles (NPs) and BiOBr nanoflkes (NFs) on surface of ordered and spaced TiO_2 nanotubes (NTs) using anodization followed by The fabricated Pt-Bi OBr / TNTAs were fully characterized, and the photocatalytic (PC) activity and stability of PtBiOBr / TNTAs toward degradation of methyl orange (MO) under visible-light The results reveal that the heterostructures of Pt / TiO_2, Pt / BiOBr and BiOBr / TiO_2 are constructed among TNTAs substrates, Pt NPs and BiOBr NFs, and the hybrid Pt-BiOBr / TNTAs catalyst. remarkable visible-light PC activity, favourable reusability and long-term stability. The combined effect of several factors may contribute to the remarkable PC performance, including strong visible-light absorption by both Pt NPs and BiOBr NFs, lower recombi nation rate of photo-generated electrons and holes attributed to the multiple heterojunction, microstructures for facile light injection and adsorption as well as efficient mass transport, and greater specific surface area for enhancing light absorption, increasing the effective contact area between the absorbed dye molecules and catalyst and benefiting the molecule transport of reactants or products.