Search

CN-121988365-A - Preparation method of black titanium dioxide and black titanium dioxide

CN121988365ACN 121988365 ACN121988365 ACN 121988365ACN-121988365-A

Abstract

The present disclosure provides a preparation method of black titanium dioxide and black titanium dioxide, and relates to the technical field of photocatalytic materials, comprising the steps of uniformly mixing white titanium dioxide and vanadium pentoxide to obtain a mixed raw material; evenly mixing melamine with the mixed raw materials according to the mass ratio to obtain intermediate powder, and placing the intermediate powder in a furnace for calcining under inert atmosphere to generate black titanium dioxide. The preparation efficiency and the safety of the black titanium dioxide can be improved.

Inventors

  • DU PANPAN
  • QI YINGCHAO
  • WANG XIULING
  • REN XIAODAN
  • CHEN ZHIQIANG
  • SHI YINGYING
  • WANG LIANG
  • WANG ZHENG

Assignees

  • 西安稀有金属材料研究院有限公司

Dates

Publication Date
20260508
Application Date
20260127

Claims (10)

  1. 1. A method for preparing black titanium dioxide, comprising the steps of: uniformly mixing white titanium dioxide and vanadium pentoxide to obtain a mixed raw material; Uniformly mixing melamine with the mixed raw materials according to the mass ratio to obtain intermediate powder; and placing the intermediate powder in a furnace for calcination under an inert atmosphere to generate black titanium dioxide.
  2. 2. The method for preparing black titanium dioxide according to claim 1, wherein the mole fraction of vanadium is 5-10%.
  3. 3. The preparation method of the black titanium dioxide according to claim 1, wherein the mass ratio of melamine to the mixed raw material is 1:5-1:10.
  4. 4. The method for producing black titanium dioxide according to claim 1, wherein the white titanium dioxide has a particle diameter of 0.02 to 1 μm.
  5. 5. The method for producing black titanium dioxide according to claim 1, wherein the white titanium dioxide is in the form of either one or both of anatase and rutile.
  6. 6. The method for preparing black titanium dioxide according to claim 1, wherein the mixing mode of the white titanium dioxide and the vanadium pentoxide is any one of dry grinding, wet grinding, dry ball milling and wet ball milling.
  7. 7. The method for producing a black titanium dioxide according to claim 1, wherein the mixing manner of melamine and the mixed raw material is any one of dry grinding, wet grinding, dry ball milling, and wet ball milling.
  8. 8. The method for preparing black titanium dioxide according to claim 1, wherein the calcination temperature is 500-900 ℃ and the heat preservation time is 2-5 h.
  9. 9. The method for producing a black titanium oxide according to claim 1, wherein the inert atmosphere is high purity nitrogen or argon.
  10. 10. Black titanium dioxide, characterized in that it is produced according to the production method of black titanium dioxide according to any one of claims 1 to 9.

Description

Preparation method of black titanium dioxide and black titanium dioxide Technical Field The embodiment of the disclosure relates to the technical field of photocatalytic materials, in particular to a preparation method of black titanium dioxide and black titanium dioxide. Background Titanium dioxide (TiO 2) is used as an oxide semiconductor material, has the characteristics of low cost, high photocatalytic activity, no toxicity, no harm and the like, and is widely applied to the fields of energy and environment. However, the TiO 2 has wider band gap, the photocatalytic activity is mainly derived from ultraviolet radiation excitation, the utilization rate of sunlight is low, meanwhile, almost 90 percent of carriers excited by illumination are compounded, and the light quantum efficiency is low. The black TiO 2 has excellent light absorption properties, can expand the absorption range of the solar spectrum to the near infrared region, and has high light absorption rate and good photocatalytic activity. The research of black TiO 2 in aspects of water and air pollution treatment, photocatalytic water decomposition for hydrogen production, photocatalytic reduction for TiO 2 for hydrocarbon fuel synthesis and the like is widely focused. At present, tiO 2 with defects and enhanced visible light absorption is regarded as black TiO 2, and the color of the black TiO 2 can be gray, brown, blue or yellow. In the related art, the method for synthesizing the black TiO 2 may include a chemical reduction method. The chemical reduction method mainly comprises a hydrogenation method, a magnesium/aluminum thermal reduction method, a hydrothermal/solvothermal reduction method, a NaBH 4 reduction method and the like. The chemical reduction method has the common problems of high energy consumption, high cost, complex equipment, high safety risk, inapplicability to large-scale production and the like. Therefore, development of a safe and efficient synthesis method with low energy consumption is urgently needed to meet the actual production requirements. Disclosure of Invention The disclosure aims to provide a preparation method of black titanium dioxide and black titanium dioxide, and further solve the problems of high production cost, low efficiency and high safety risk of preparing black titanium dioxide caused by the limitations and defects of the related art at least to a certain extent. According to one aspect of the present disclosure, there is provided a method for preparing black titanium dioxide, comprising: uniformly mixing white titanium dioxide and vanadium pentoxide to obtain a mixed raw material; Uniformly mixing melamine and the mixed raw materials according to the mass ratio to obtain intermediate powder; The intermediate powder is placed in a furnace and calcined under inert atmosphere to produce black titanium dioxide. In an exemplary embodiment of the present disclosure, the mole fraction of vanadium is 5-10%. In an exemplary embodiment of the present disclosure, the mass ratio of melamine to the mixed raw material is 1:5 to 1:10. In one exemplary embodiment of the present disclosure, the white titanium dioxide has a particle size of 0.02 to 1 μm. In one exemplary embodiment of the present disclosure, the white titanium dioxide is in the crystalline form of either or both of anatase and rutile. In an exemplary embodiment of the present disclosure, the white titanium dioxide is mixed with vanadium pentoxide in any one of dry milling, wet milling, dry ball milling, and wet ball milling. In an exemplary embodiment of the present disclosure, the melamine is mixed with the mixed raw material in any one of dry grinding, wet grinding, dry ball milling, and wet ball milling. In one exemplary embodiment of the present disclosure, the calcination temperature is 500-900 ℃ and the incubation time is 2-5 hours. In one exemplary embodiment of the present disclosure, the inert atmosphere is high purity nitrogen or argon. According to one aspect of the present disclosure, there is provided a black titanium oxide, which is prepared according to the above-described preparation method of black titanium oxide. In the technical scheme provided in the embodiments of the disclosure, on one hand, V 5+ in vanadium pentoxide is reduced to V 4+ in a low valence state and doped into titanium dioxide lattice to replace doping of Ti 4+,V4+ introduces a new impurity energy level to reduce the band gap, and light absorption of titanium dioxide is expanded from ultraviolet region to visible light range. The melamine is used as a cheap and efficient solid nitrogen source and a reducing agent, and the pyrolysis process of the melamine not only consumes oxygen in the atmosphere and creates a strong reducing environment, so that a large amount of Ti 3+ and oxygen vacancies are generated on the surface of the titanium dioxide, and the nitrogen doping of the titanium dioxide and the introduction of Ti 3+ and oxygen vacancy defects can be realized in