Preparation method of hydrophilic anatase-phase titanium dioxide nano photocatalyst

Abstract

The invention relates to a preparation method of a hydrophilic anatase-phase titanium dioxide nano photocatalyst. The preparation method comprises the following steps: (S1) preparing mixed liquid of ethanol and titanium tetrachloride at room temperature; performing an alcohol thermal reaction of the mixed liquid in an oven; after the reaction, cooling to room temperature to obtain white precipitate with supernatant; (S2) pouring the supernatant in the step (S1), adding ethanol into the white precipitate and centrifuging; repeatedly cleaningto obtain white precipitate; (S3) adding deionized water into the white precipitate obtained in the step (S2), and performing freeze drying to obtain a white powdery hydrophilic anatase-phase titanium dioxide nano photocatalyst. With a size of only about10nm, the photocatalyst prepared in the invention has the advantages of small size, large specific surface area, and has strong redox ability and good photocatalysis effect under the impact of surface effect, small size effect and quantum size effect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and relates to a method for preparing a hydrophilic anatase phase titanium dioxide nanometer photocatalyst. Background technique [0002] The nanomaterial is composed of nanoparticles, and the particle size of the nanoparticles is in the range of 1 nanometer to 100 nanometers. Nanomaterials have small size, large specific surface area, many surface atoms, and high surface energy; small particle size and small volume, the electrons in the particles are confined in a small space, the electron transport is restricted, and the mean free path is shortened, making the electrons localized. And the coherence is enhanced; when the particle size drops to close to or smaller than the exciton Bohr radius, the electronic energy level near the Fermi level changes from a quasi-continuous energy level to a discrete energy level. The above are the surface effect, small size effect and quantum size effect ...

AI Technical Summary

Problems solved by technology

[0007] Printing and dyeing wastewater has problems such as large discharge, high concentration, and low biodegradability. It is one of the most serious water pollution sources at present. It is not only harmful to humans, but also poses a great threat to ecology.

Conventional titanium dioxide photocatalysts generally do not have hydrophilic characteristics, so it is difficult to completely dissolve in the dye solution, the dye adsorption is poor, and the photocatalytic degradation effect is not satisfactory

Photocatalyst recovery often requires cumbersome processes such as multiple washings, centrifugation, and filtration, making it difficult to reuse and poor recovery effect

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