Facile Preparation and Photocatalytic Properties of TiO₂ Fiber Membrane with Wrinkle Structure

Herein, TiO₂ fiber membrane with wrinkle structure was fabricated by an electrospinning technique in combination with a sol–gel process. The as-prepared TiO₂ membranes were interwoven with interconnected nanofibers. The surfacial and morphological features of the obtained TiO₂ fiber membrane could be tuned by varying the content of the precursor, titanium (IV) n-butoxide. The nature of wrinkle structure and high surface area demonstrates an impact on the electron–hole separation and charge transfer during photocatalytic tests, thereby leading to an obvious enhancement in the photocatalytic performance. The results revealed the resultant TPNs-20 sample displayed the best photocatalytic performance toward the removal of methyl orange (MO), and its degradation degree was up to 97% within 70 min. Furthermore, a photocatalytic mechanism is proposed on the basis of results and analysis, which indicates that ˙OH and ˙O⁻ ₂ radicals are the main reactive species responsbile for the enhanced photocatalytic activity. We anticipate that controllable synthesis of promising TiO₂ fiber membranes in this study provides new insight into the development of efficient photocatalysts for high-performance environmental remediation.