摘要：The development of well-defined TiO2 nanoarchitectures is a versatile strategy to achieve high-efficiency photocatalytic *** this study,mesoporous TiO2 nanofibers consisting of oriented nanocrystals were fabricated by a facile vapothermal-assisted topochemical transformation of preformed H-titanate *** vapothermal temperature is crucial in tuning the microstructures and photocatalytic redox properties of the resulting mesoporous TiO2 *** microstructures were characterized with XRD,TEM,XPS and nitrogen adsorption-desorption isotherms,*** photocatalytic activities were evaluated by photocatalytic oxidation of organic pollutant(Rhodamine B as an example)as well as photocatalytic reduction of water to generate hydrogen(H2).The nanofibers vapothermally treated at 150°C showed the highest photocatalytic activity in both oxidation and reduction reactions,2 times higher than that of *** oriented alignment and suitable mesoporosity in the resulting nanofiber architecture were crucial for enhancing photocatalytic *** oriented alignment of anisotropic anatase nanocrystals shall facilitate faster vectorial charge transportation along the nanofibers ***,the suitable mesoporosity and high surface area would also effectively enhance the mass exchange during photocatalytic *** also demonstrate that efficient energy-recovering photocatalytic water treatments could be accomplished by a cascading oxic-anoxic process where the dye is degraded in the oxic phase and hydrogen is generated in the successive anoxic *** study showcases a novel and facile method to fabricate mesoporous TiO2 nanofibers with high photocatalytic activity for both clean energy production and environmental purification.