High-efficiency visible light response amorphous plasma heterojunction nano TiO2 sol

A plasma and amorphous technology, applied in the direction of light water/sewage treatment, biocide-containing paint, anti-fouling/underwater coating, etc., to achieve remarkable photocatalytic effect, good dispersion, and low price

Active Publication Date: 2017-07-04
FUZHOU MINGGU NANOMETER SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reported solutions include: surface photosensitization, ion doping, noble metal deposition, compound semiconductor, etc., but limited by vari

Method used

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  • High-efficiency visible light response amorphous plasma heterojunction nano TiO2 sol
  • High-efficiency visible light response amorphous plasma heterojunction nano TiO2 sol
  • High-efficiency visible light response amorphous plasma heterojunction nano TiO2 sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1: the preparation of aqueous titanium peroxide solution

[0042] 1) Add 0.1mol of TiOSO to the 4 Drop into the strongly stirred 1000mL pH=1 sulfuric acid aqueous solution at the speed of 1 drop / s to prepare 0.1mol / L TiOSO 4 solution;

[0043] 2) Adjust the pH value of the solution to 8 with ammonia water, and centrifuge to obtain Ti(OH) 4 precipitation;

[0044] 3) The resulting Ti(OH) 4 The precipitate was washed 10 times with deionized water;

[0045] 4) The washed Ti(OH) 4 The precipitate was dispersed in 400 mL of hydrogen peroxide solution with a mass concentration of 10%, and an aqueous titanium peroxide solution with a mass concentration of 2% was prepared.

Embodiment 2

[0046] Example 2: Amorphous Nano TiO 2 Sol preparation:

[0047] 0.5 g of 30wt% nano-SiO 2 The aqueous dispersion (crystal conversion control agent) was added to the 400mL aqueous titanium peroxide solution prepared in Example 1, stirred at room temperature for 30 minutes, then the solution was heated to 80°C, and kept at reflux for 8 hours to obtain amorphous nano TiO 2 Sol.

Embodiment 3

[0048] Example 3: Amorphous plasmonic heterostructure nano-TiO 2 Sol preparation:

[0049] Amorphous nano-TiO prepared in embodiment 2 2 Add 4 grams of silver nitrate solution (the concentration of silver particles is 1000ppm) to the sol, and after 600W ultrasonic dispersion for 10min, under ultrasonic conditions, at a temperature of 20°C, a light wavelength of 400nm, and 10mw / cm 2 Photochemical reduction reaction under light intensity for 0.5 hours to obtain amorphous plasmonic heterostructure nano-TiO 2 Sol.

[0050] figure 1 For the resulting amorphous plasmonic heterostructure nano-TiO 2 TEM image of the sol. Depend on figure 1 It can be seen that the nanoparticle unit of the heterojunction structure of the obtained sol sample is composed of smaller nano-silver (black body) and nano-TiO 2 (yin hidden body) composition.

[0051] figure 2 For the resulting amorphous plasmonic heterostructure nano-TiO 2 XRD pattern of the sol. Depend on figure 2 It can be seen t...

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Abstract

The invention discloses an amorphous plasma heterojunction nano TiO2 sol having high-efficiency visible light response as well as a preparation method and an application thereof. The amorphous plasma heterojunction nano TiO2 sol is formed by taking a heterojunction structural body formed by precious metals and nano TiO2, or other semiconductor-precious metals and nano TiO2 by chemical connection as nano particles, schottky junction generated by cooperation among precious metals and nano TiO2 or other semiconductor-precious metals and nano TiO2 is used for performing resonance effects with local surface plasma to obtain the excellent visible-light photocatalysis effect, and the problem of low visible-light utilization rate of common TiO2 photocatalysts can be solved.

Description

technical field [0001] The invention belongs to the field of preparation of photocatalytic materials, in particular to an amorphous plasma heterojunction nano-TiO with high-efficiency visible light response 2 Sol and its preparation method and application. Background technique [0002] With the development of society and the improvement of people's living standards, environmental pollution is increasingly affecting people's health, and semiconductor TiO 2 The obvious removal effect of photocatalytic materials on various pollutants in the environment has attracted worldwide attention. Under the condition of light greater than its bandgap energy, TiO 2 Photocatalysts can completely degrade harmful organic substances in the environment, and can also oxidize and remove toxic gases such as nitrogen oxides and sulfides in the atmosphere. In addition, TiO 2 Photocatalytic materials also have functions such as sterilization, deodorization, and surface self-cleaning, which can fu...

Claims

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Application Information

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IPC IPC(8): B01J23/38B01J23/46B01J23/50B01J23/52B01J23/54B01J23/89C02F1/30C09D1/00C09D5/14A61L9/18
Inventor 余晓伟陈锡华
Owner FUZHOU MINGGU NANOMETER SCI & TECH
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