Flexible titanium oxide nanofiber membrane and preparation method thereof

Abstract

The invention relates to a flexible titanium oxide nanofiber membrane and a preparation method thereof. The preparation method includes firstly dissolving a titanium source and a non-titanium metal salt in solvent, and sequentially adding coupling agent and surfactant to be uniformly mixed and obtain stable precursor solution with interpenetrating three-dimensional network structure molecular chains; then making the precursor solution into a precursor fiber membrane through an electrospinning technique; burning the precursor fiber membrane in the air to obtain the flexible titanium oxide nanofiber membrane. The preparation method is simple and low in cost, the obtained titanium oxide nanofiber membrane is good in flexible and has promising application prospect in the fields such as air purification, water treatment, hydrogen production by photodecomposition, dye-sensitized solar cells, lithium ion batteries and self-cleaning environment protection and energy sources.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a flexible titanium oxide nanofiber membrane and a preparation method thereof, in particular to a flexible titanium oxide nanofiber with a precursor solution having an interpenetrating three-dimensional network structure molecular chain as a spinning solution Membrane preparation method. Background technique [0002] As an excellent semiconductor photocatalyst, titanium oxide has broad application prospects in environmental protection and energy fields such as air purification, water treatment, hydrogen production by photolysis, dye-sensitized solar cells, lithium-ion batteries, and self-cleaning. However, at present, the practical application of titanium oxide photocatalysts is mainly realized through the suspension phase system or the method of loading. Among them, the titanium oxide suspension phase system has defects such as easy aggregation, easy deactivation, difficult ...

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Problems solved by technology

However, these patents add high molecular polymers when preparing titanium dioxide nanofibers, which makes the content of ceramic components in the hybrid fiber membrane low, which affects the final yield. In addition, too much organic matter can easily lead to severe shrinkage of the hybrid fiber membrane during the calcination process. , become hard and brittle, and the mechanical properties of the fiber membrane are poor

Chinese patent CN201310223225.9 discloses a method for preparing a silica / titania composite mesoporous flexible non-woven fiber membrane. However, in this patent, polymers need to be added during the preparation of silica / titania composite nanofibers, and the precursor solution is prepared The proportion of titanium salt in the medium is low, resulting in a very low proportion of final titanium oxide nanofibers

Ceramics International38 (2012) 883-886 uses electrospinning technology to prepare titania-silicon oxide flexible ceramic fiber membranes. Although the prepared titania nanofiber membranes have certain flexibility, the nanofiber membranes have an amorphous structure and do not have Photocatalytic performance, so the practical application is severely limited

Catalysis Today 225 (2014) 10-17 reported the preparation of mesoporous silica / titanium oxide nanofibers by electrospinning technology, Journal of Colloid and Interface Science 355 (2011) 328-333 reported the preparation of porous structures by electrospinning technology Iron oxide / titanium oxide nanofibers, these methods do not add polymers, only add surfactants and age to improve the spinnability of the precursor solution and prepare porous ceramic nanofibers, but the fibers prepared by these methods are due to There are problems such as poor diameter uniformity, poor continuity, and single fiber defects, which make the fibers easy to be brittle, and it is impossible to obtain flexible titanium oxide nanofibers

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