Core-Shell Heterostructured and Visible-Light-Driven Titanoniobate/TiO2 Composite for Boosting Photodegradation Performance.

摘要: Herein, we report a one-dimensional (1D) S-doped K3Ti5NbO14@TiO2 (STNT) core-shell heterostructured composite with an enhanced photocatalytic degradation activity under visible light, which was prepared by simple reassembly-calcination method using thiourea as the S source. The anisotropically shaped rods are favorable for rapid transport of photogenerated charge carriers. substitution Ti4+ S6+ is primarily incorporated into lattice TiO2 shell so to create intra-band-gap state below conduction band (CB) position, giving rise Ti−O−S bonds and thus light response. presence electron-deficient atoms benefit decreased recombination rate electrons holes capturing (e−). Meanwhile, tight close interface between K3Ti5NbO14 formed achieve nano-heterojunction structure, leading fostered separation its interfacial holes. visible-light-driven methylene blue (MB) STNT composites higher than that pure K3Ti5NbO14, owing synergistic effects doping heterojunction. A possible mechanism proposed reasonable discussion. This work may provide insight constructing highly efficient photocatalysts used toward sustainable environmental remediation resource shortages.