Titanium dioxide nano-particles repairing nanowires heterojunction composite material

A technology of titanium dioxide and nanoparticles, which is applied in the field of photocatalytic materials, can solve the problems of unsatisfactory heterojunction effect, low light collection and mass transfer efficiency, etc., and achieve the goals of increased area, good photocatalytic performance, and increased mass transfer efficiency Effect

Inactive Publication Date: 2015-09-30
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Heterostructure TiO 2 The preparation of photocatalysts generally adopts sol coacervation method, hydrothermal method, precipitation method, microemulsion method, etc. The hydrothermal method is favored by many people because of its simple operation. All photocatalytic processes such as charge transfer and mass transfer will also be different. If the effective heterojunction area is small, the photoinduced charges need to go through complicated ways to be transferred to the surface of the heterojunction after being separated, and the light harvesting and transmission The mass efficiency is very low, and these shortcomings make the effect of the heterojunction far less than expected

Method used

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  • Titanium dioxide nano-particles repairing nanowires heterojunction composite material

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Effect test

Embodiment 1

[0016] Add gas-phase titanium dioxide P25 to NaOH solution, the molar ratio is 1:120, mix evenly, transfer it to the reaction kettle, heat and react at 130-140°C for 24 hours, and rinse the product with dilute nitric acid for 3 hours after natural cooling -4 times, and then washed with ionized water until the pH is 7, and the washed filter cake is centrifuged at 10,000 r / min for 1-5 minutes, and the product is vacuum-dried to obtain titanium dioxide nanowires.

Embodiment 2

[0018] Add gas-phase titanium dioxide P25 to NaOH solution, the molar ratio is 1:120, mix well, transfer it to the reaction kettle, and ultrasonically react at 130-140°C for 24 hours. After the product is naturally cooled, rinse it with dilute nitric acid for 3 -4 times, and then washed with ionized water until the pH is 7, the washed filter cake is centrifuged at 10,000 r / min for 1-5 minutes, and the product is vacuum-dried to prepare titanium dioxide nanowires with high uniformity.

Embodiment 3

[0020] Add gas-phase titanium dioxide P25 into NaOH solution, the molar ratio is 1:120, mix evenly, transfer it to the reaction kettle, and stir it with magnetic force at 130-140°C for 24 hours. After the product is naturally cooled, rinse it with dilute nitric acid 3-4 times, and then washed with ionized water until the pH is 7, and the washed filter cake is centrifuged at 10,000 r / min for 1-5 minutes, and the product is vacuum-dried to obtain titanium dioxide nanowires with high uniformity.

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Abstract

The invention discloses a titanium dioxide nano-particles repairing nanowires heterojunction composite material, which adopts a hydrothermal method to prepare anatase type titanium dioxide nanowires firstly, then the anatase type titanium dioxide nanowires are added into hydrothermal reaction of titanium oxide nanoparticulates, and are used as a base body, the titanium oxide nanoparticulates grow on the anatase type titanium dioxide nanowires by using a mode of an epitaxial growth mode, and an heterojunction composite material with excellent photocatalytic performance is obtained by controlling mass ratio of nanowires to nanoparticulates. Compared with existing titanium dioxide materials, the titanium dioxide nano-particles repairing nanowires heterojunction composite material has excellent photocatalytic performance, and has excellent application prospect in the field of photocatalytic treatment organic pollutants.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide nanowire heterojunction composite material repaired by titanium dioxide nanoparticles, and specifically belongs to the technical field of photocatalytic materials. Background technique [0002] Semiconductor TiO 2 Photocatalytic materials have been widely studied because of their high photocatalytic activity and non-toxicity. However, many problems need to be solved for their large-scale application in the treatment of actual pollution, including semiconductor TiO 2 Enhancement of photocatalytic activity. Impact semiconductor TiO 2 The photocatalytic activity factors of photocatalytic materials mainly include crystal form, crystallinity, crystal particle size, specific surface area, morphology and pore structure, etc. Due to the special energy band structure and the special transport performance of carriers, heterojunction materials can inhibit the photogenerated electron-hole recom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B82Y30/00B82Y40/00A62D3/17A62D101/20A62D101/26A62D101/28
Inventor 谢宇胡冬生周盼盼郭若彬凌云
Owner NANCHANG HANGKONG UNIVERSITY
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