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Method for preparing visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on surface

A titanium dioxide, surface-loaded technology, applied in the field of photocatalyst preparation, can solve the problems affecting the photocatalytic efficiency of semiconductors, the photocatalytic efficiency is not very high, the utilization rate of solar energy is low, etc., and achieves low cost, high preparation efficiency and mild reaction conditions. Effect

Inactive Publication Date: 2012-08-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Although TiO 2 As a photocatalytic material, it has incomparable performance advantages, but there are still many defects in practical applications. (1) First, TiO 2 The band gap is small (3.2eV), so that its absorption of light is limited to the ultraviolet region, and the utilization rate of solar energy is very low; (2) The recombination of holes and electrons affects the photocatalytic efficiency of semiconductors
Due to the existence of these defects, its photocatalytic efficiency is not very high, and it still cannot meet the requirements of practical applications.

Method used

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  • Method for preparing visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on surface
  • Method for preparing visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on surface
  • Method for preparing visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on surface

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Experimental program
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Effect test

Embodiment 1

[0020] Step 1: Prepare a lithium chloride solution with a molar concentration of 0.1M; mix the three according to the volume ratio of salt solution: tetrabutyl titanate: absolute ethanol = 0.3: 1.5: 100, and stir vigorously until a titanium dioxide sol is formed; After standing for 24 hours, centrifuge and wash with absolute ethanol, and dry at 80°C for 12 hours under vacuum to obtain spherical titanium dioxide particles;

[0021] Step 2: prepare a nickel chloride solution with a molar concentration of 0.01M; disperse the titanium dioxide microspheres prepared in step 1 into the nickel salt solution in a ratio of 0.001:1 by nickel element and titanium dioxide mass ratio; or according to the mass ratio of nickel: Titanium dioxide: deionized water = 0.001:1:20, first dissolve the nickel salt solid powder with deionized water, then add the titanium dioxide powder prepared in step 1; magnetically stir for 15 minutes and then ultrasonically disperse for 15 minutes, so that the titan...

Embodiment 2

[0023] Step 1: Prepare a sodium chloride solution with a molar concentration of 0.1M; mix the three according to the volume ratio of salt solution: tetrabutyl titanate: absolute ethanol = 0.4:2:100, and stir vigorously until a titanium dioxide sol is formed; After standing for 24 hours, centrifuge and wash with absolute ethanol, and dry at 80°C for 12 hours under vacuum to obtain spherical titanium dioxide particles;

[0024] Step 2: prepare a nickel nitrate solution with a molar concentration of 0.05M; disperse the titanium dioxide microspheres prepared in step 1 into the nickel salt solution at a ratio of 0.01:1 by mass ratio of nickel element to titanium dioxide; or according to the mass ratio of nickel:titanium dioxide : deionized water=0.01:1:20, first dissolve the nickel salt solid powder with deionized water, then add the titanium dioxide powder prepared in step 1; magnetically stir for 15 minutes and then ultrasonically disperse for 15 minutes to completely disperse the...

Embodiment 3

[0026] Step 1: Prepare a sodium chloride solution with a molar concentration of 0.1M; mix the three according to the volume ratio of salt solution: tetrabutyl titanate: absolute ethanol = 0.5:2:100, and stir vigorously until a titanium dioxide sol is formed; After standing for 24 hours, centrifuge and wash with absolute ethanol, and dry at 80°C for 12 hours under vacuum to obtain spherical titanium dioxide particles;

[0027] Step 2: Prepare a nickel sulfate solution with a molar concentration of 0.05M; disperse the titanium dioxide microspheres prepared in step 1 into the nickel salt solution at a ratio of 0.01:1 by mass ratio of nickel element to titanium dioxide; or according to the mass ratio nickel:titanium dioxide : deionized water=0.01:1:20, first dissolve the nickel salt solid powder with deionized water, then add the titanium dioxide powder prepared in step 1; magnetically stir for 15 minutes and then ultrasonically disperse for 15 minutes to completely disperse the ti...

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Abstract

The invention relates to a method for preparing a visible light responding spherical titanium dioxide composite photocatalyst with nickel oxide supported on the surface. As a photocatalytic material, TiO2 has incomparable performance advantages but has the following defects: TiO2 has narrower band gap, so that the light absorption range of TiO2 is only limited to the ultraviolet region; and recombination of holes and electrons affect the photocatalysis efficiency of semiconductors. The method comprises the following steps: mixing and stirring salt solution, tetrabutyl titanate and absolute ethyl alcohol to form titanium dioxide sol and carrying out standing, centrifuging, washing and vacuum drying to prepare spherical titanium dioxide particles; and then dispersing titanium dioxide microspheres in nickel salt solution and carrying out magnetic stirring, ultrasonic dispersion, vacuum drying and roasting to obtain the product. The method has the following advantages that the prepared photocatalyst has efficient photocatalytic activity, can degrade toxic and harmful substances in a photocatalytic manner, can completely degrade organic pollutants into water and carbon dioxide, can be applied to photocatalytic degradation reactions of various organics, has degradation rate close to 100% and has great industrial application value.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst, in particular to a preparation method of a visible light-responsive spherical titanium dioxide composite photocatalyst loaded with nickel oxide on the surface. Background technique [0002] The pollutants discharged in production and life include a large number of persistent pollutants with three effects. These toxic organic compounds have the characteristics of refractory degradation in conventional water treatment, and their elimination is the difficulty that environmental workers pay attention to. TiO 2 Photocatalyst materials have very broad application prospects in the degradation of organic pollutants, water and air purification, sterilization and disinfection, ecological building materials and other fields, which has aroused extensive interest and concern from governments, industrial departments and academic circles around the world. In practical applications, TiO 2 Photocataly...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J21/06B01J35/08
Inventor 李军奇王德方朱振峰刘辉何选盟郭占云
Owner SHAANXI UNIV OF SCI & TECH
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