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

Abstract

Self-standing photocatalytic membranes constructed from TiO2 nanofibers hold great promise in environmental remediation; however, challenges still remained for the poor mechanical properties of polycrystalline TiO2 nanofibers. Herein, soft Zr-doped TiO2 (TZ) nanofibrous membranes with robust mechanical properties and enhanced photocatalytic activity were fabricated via electrospinning technique. The Zr4+ incorporation could effectively inhibit the grain growth and reduce the surface defects and breaking point of TiO2 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 TiO2-based membranes for various application.

Ultralight and fire-resistant ceramic nanofibrous aerogels with temperature-invariant superelasticity

“…S15). The dispersed defects in the glassy silica tetrahedron networks act as a “lubrication region” that can dissipate external stress and yield large deformations ( 23 , 44 ), as shown in Fig. 2H .…”

Electrospinning and Electrospun Nanofibers: Methods, Materials, and Applications

“…For example, Zr-doped TiO 2 ceramic nanofibers were fabricated by adding an appropriate amount of titanium(IV) isopropoxide and zirconium(IV) acetylacetonate into the PVP solution. 301 Figure 18E shows the homogeneous distribution of Ti, Zr, and O elements in the as-obtained nanofibers at the nanoscale. Hierarchical nanostructure can also be produced.…”

Hydrothermal syntheses of tungsten doped TiO2 and TiO2/WO3 composite using metal oxide precursors for charge storage applications

“…overcome the low ion diffusion coefficient [20]; improving the electrical properties of TiO 2 by metallic and nonmetallic doping [13]. The doping of TiO 2 with non-metals (N and H) and transition metals (Ni 3+ , Zr 4+ , W 6+ , Ce 4+ , V 5+ , Nb 5+ , Fe 3+ ) is considered an efficient method to improve the electrical conductivity of TiO 2 [21][22][23]. Recently, a significant improvement in the capacitive performance was realized through the hydrogenation of one-dimensional anodic TiO 2 nanotube arrays due to the improved electrochemical activity and electrode conductivity with hydrogen induced Ti 3+ sites in the TiO 2 lattices [24].…”