Preparation method of TiO2/WO3 double-layer composite nanotubes using TiO2 for coating WO3

Abstract

The invention relates to a preparation method of TiO2 / WO3 double-layer composite nanotubes using TiO2 for coating WO3. TiO2 is used as a homogeneous semiconductor material and has a high photo-induced electron and electron-hole pair recombination rate; the defects of low quantum efficiency and the like When TiO2 is used as a homogeneous semiconductor material, TiO2 has a high photo-induced electron and electron-hole pair recombination rate, low quantum efficiency and other defects, the defects limit catalytic performance of TiO2 to a certain degree so as to cause low efficiency of TiO2 on the aspect of sewage treatment. According to the invention, the double-layer composite nanotubes using TiO2 for coating WO3 are finally prepared by selecting and using a porous anodic alumina film as a template, using analytically pure H40N10O41W12*xH2O and TiF4 as the raw materials and adopting a layer-by-layer assembly technology. The composite nanotubes prepared by the preparation method adopt a double-layer structure, greatly increase the contact area of TiO2 and WO3 and are beneficial for improving photocatalytic performance of the composite nanotubes. Meanwhile, the nanotubes exist in an array mode, are easy to be recovered from treated sewage to avoid the causing of secondary pollution. The preparation method has very important application significance on the aspect of sewage treatment. When the TiO2 / WO3 double-layer composite nanotubes are applied to the light-catalyzed reaction of 5 mg / L of a methyl orange solution, catalytic degradation efficiency nearly reaches 100 percent after 180 min.

Description

Technical field: [0001] The invention relates to a method for preparing an inorganic composite nanotube, in particular to a TiO 2 Coated WO 3 TiO 2 / WO 3 The preparation method of double-layer composite nanotubes, more specifically, using porous anodic aluminum oxide film as a template to prepare TiO by layer-by-layer assembly technology through liquid deposition 2 Coated WO 3 bilayer composite nanotubes. Background technique: [0002] In recent years, the treatment of industrial wastewater has gradually become a research hotspot around the world. TiO 2 Due to the advantages of strong oxidation ability, high catalytic activity, good chemical stability, low price, and non-toxicity, it has become the most in-depth study of photocatalytic materials in the fields of wastewater treatment, air purification, and sterilization. The activity of photocatalysts has a lot to do with the morphology, size and structure, TiO 2 The application of powder photocatalysts is limited due...

AI Technical Summary

Problems solved by technology

(1) TiO 2 It has a wide forbidden band and can only absorb short-wavelength light with a wavelength below 385nm.

(2)TiO 2 As a single semiconductor material, the recombination rate of photogenerated electrons and holes is high, and the defects such as low quantum efficiency also limit its use to a certain extent.

for WO 3 / TiO 2 Composite materials, except for the nanotube structure, most of the structures made by others exist in the form of particles. These irregularly dispersed forms are difficult to recycle in sewage treatment and are likely to cause secondary pollution.

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