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Self-standing photocatalytic membranes constructed from TiO 2  nanofibers hold great promise in environmental remediation; however, challenges still remained for the poor mechanical properties of polycrystalline TiO 2  nanofibers. Herein, soft Zr-doped TiO 2  (TZ) nanofibrous membranes with robust mechanical properties and enhanced photocatalytic activity were fabricated  via  electrospinning technique. The Zr 4+  incorporation could effectively inhibit the grain growth and reduce the surface defects and breaking point of TiO 2  nanofiber. The as-prepared TZ membranes were composed of well-interconnected nanofibers with a high aspect ratios, small grain size and pore size, which exhibited good tensile strength (1.32 MPa) and showed no obvious damage after 200 cycles of bending to a radius of 2 mm. A plausible bending deformation mechanism of the soft TZ membranes was proposed from microscopic single nanofiber to macroscopical membranes. Moreover, the resultant TZ membranes displayed better photocatalytic performance for methylene blue degradation compared to a commercial catalyst (P25), including high degradation degree of 95.4% within 30 min, good reusability in 5 cycles, and easiness of recycling. The successful preparation of such fascinating materials may open up new avenues for the design and development of soft TiO 2 -based membranes for various application.

Soft Zr-doped TiO2 Nanofibrous Membranes with Enhanced Photocatalytic Activity for Water Purification