Trivalent titanium ion self-doped titanium dioxide nanosheet catalyst

A titanium dioxide and nanosheet technology, applied in the field of photocatalyst materials, can solve the problems of increasing the carrier recombination center, limiting practical application, reducing the thermal stability of TiO2, etc., and achieving the effect of good photocatalytic performance

Inactive Publication Date: 2016-06-15
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these dopant ions are different from Ti or O in terms of the properties of elements, and the doped ions exist in TiO as impurity ions. 2 lattice, which tends to reduce the TiO 2 Thermal stability and increased carrier recombination centers
In addition, doping usually requires high-temperature treatment or complicated preparation procedures, which limits the practical application of this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Slowly add 3ml of 47% hydrofluoric acid to 20ml of tetraisopropyl titanate dropwise, then transfer it to the reaction kettle, and react at 200°C for 24h, then cool the system to room temperature naturally, and then use 0.1M NaOH solution Rinse 5 times, then wash with ionized water until the pH is 7, and dry overnight in vacuum to prepare titanium dioxide nanosheets.

Embodiment 2

[0014] Add 0.5 g of titanium dioxide nanosheets and 0.24 g of sodium borohydride prepared in Example 1 into deionized water, stir the above reaction mixture evenly, and heat and react at 180° C. for 12 h, then cool naturally, and then transfer it to 0.1 Stir in M ​​hydrochloric acid solution for 10-15 hours, and obtain trivalent titanium ion self-doped titanium dioxide nanosheet catalyst filter cake by centrifugation. The obtained filter cake is washed with deionized water until the pH is 7, and then vacuum-dried at 60°C After treatment, the trivalent titanium ion self-doped titanium dioxide nanosheet catalyst is obtained.

Embodiment 3

[0016] Add 0.5 g of titanium dioxide nanosheets and 0.12 g of sodium borohydride prepared in Example 1 into deionized water, stir the above reaction mixture evenly, and heat and react at 180° C. for 12 h, then cool naturally, and then transfer it to 0.1 Stir in M ​​hydrochloric acid solution for 10-15 hours, and obtain trivalent titanium ion self-doped titanium dioxide nanosheet catalyst filter cake by centrifugation. The obtained filter cake is washed with deionized water until the pH is 7, and then vacuum-dried at 60°C After treatment, the trivalent titanium ion self-doped titanium dioxide nanosheet catalyst is obtained.

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PUM

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Abstract

The invention discloses a trivalent titanium ion self-doped titanium dioxide nanosheet catalyst. A titanium dioxide nanosheet is firstly prepared by adopting a hydrothermal reaction method; then the titanium dioxide nanosheet is reduced by using sodium borohydride to obtain the trivalent titanium ion self-doped titanium dioxide nanosheet catalyst. According to the trivalent titanium ion self-doped titanium dioxide nanosheet catalyst disclosed by the invention, by adopting sodium borohydride, part of Ti<4+> on the titanium dioxide nanosheet is reduced into Ti<3+>, so that the aim of self doping is achieved; the proportions of the Ti<4+> and the Ti<3+> in the titanium dioxide nanosheet are controlled by controlling the dosage of the sodium borohydride serving as a reducing agent, thereby obtaining a photocatalytic material with excellent photocatalytic performance. Compared with an existing titanium dioxide material, a photocatalytic material has excellent photocatalytic performance and has a good application prospect in the field of treating organic pollutants by photocatalysis.

Description

technical field [0001] The invention relates to a trivalent titanium ion self-doped titanium dioxide nanosheet catalyst mainly relates to its preparation method, and specifically belongs to the technical field of photocatalyst materials. Background technique [0002] Semiconductor TiO 2 Photocatalytic materials have been extensively studied due to their high photocatalytic activity and non-toxicity, however pure TiO 2 The material has a large band gap, and electron-hole pairs can only be generated under the excitation of ultraviolet light, and then the photocatalytic degradation reaction is carried out, so the practical application is limited. In addition, the use of ion doping can effectively solve the problem of TiO 2 The problem of wide band gap can be excited by visible light, and the utilization rate of visible light can be improved. [0003] Metal doping and non-metal doping are more methods used in research now. In TiO 2 Doped with some metal ions or non-metal ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J35/02B01J35/00B01J37/10B01J37/16
CPCB01J21/063B01J35/004B01J35/023B01J37/10B01J37/16
Inventor 谢宇陈玺茜胡冬生方晶戴玉华凌云
Owner NANCHANG HANGKONG UNIVERSITY
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