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Binary nano composite photo-catalyst preparation method

A photocatalyst and nanocomposite technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of blue shift of light absorption sidebands, achieve low density, and improve available light absorption Strength, easy operation and simple effect

Inactive Publication Date: 2008-11-19
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the wide bandgap semiconductor material TiO is the most researched. 2 , however TiO 2 As a photocatalyst, it can only be excited by ultraviolet light; coupled with the nano-effect pursued in order to increase the specific surface area and improve the catalytic efficiency, the light absorption sideband of the catalyst will often be further blue-shifted due to the quantum size effect; and the actual solar radiation reaching the surface The energy is concentrated in the 460-500nm wavelength range, the visible light component accounts for about 50%, and the ultraviolet component (300-400nm) is less than 5%. Therefore, how to efficiently use sunlight, especially the visible light, and develop photocatalysts that can be excited by visible light Increasingly becoming the goal pursued by researchers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Implementation Example 1: Accurately measure 248.4 mL of concentrated hydrochloric acid and put it into a 500 mL volumetric flask, add deionized water to dilute to the mark and shake well to prepare a 6mol / L hydrochloric acid solution. Accurately measure 236.4mL TiCl 4Concentrated solution, slowly added to a 2000mL beaker placed in an ice-water bath in a fume hood, and at the same time slowly added 263.60mL of prepared hydrochloric acid solution, and kept stirring rapidly until TiCl 4 All dissolved to get 4mol / L TiCl 4 solution. Accurately measure 9.37mL of 4mol / L TiCl 4 Put the solution into a 500mL beaker, add 124.9mL deionized water, add 0.5mL AEO-3, add 0.3mol / L Cd(NO 3 ) 2 Solution 6.25mL. Slowly add 3moL / lNH 3 until the pH value reaches 8-9. Aging for 20 hours, washed with water until free of Cl - . Exchange water with ethanol to obtain alcohol gel. After drying under the condition of 262°C and 8.5MPa, the ethanol reaches supercritical state, and calcines...

Embodiment 2

[0024] Implementation Example 2: Accurately measure 9.37mL of 4mol / L TiCl 4 Put it into a 500mL beaker, add 124.9mL deionized water, add 0.5mL AEO-3, slowly add 3moL / lNH 3 When the pH value reaches 8-9, a hydrogel is obtained. Continue to drop 0.3mol / L of Cd(NO 3 ) 2 Solution 6.25mL, slowly drop 3moL / lNH 3 When the pH value reaches 8-9, a hydrogel is obtained. Aging for 20 hours, washed with water until free of Cl - . Exchange water with ethanol to obtain alcohol gel. After drying under the condition of 262°C and 8.5MPa, the ethanol reaches supercritical state, and calcines the obtained catalyst in a muffle furnace at 500°C for 1 hour to obtain a nanocomposite photocatalyst. 0.3 g of the obtained catalyst was used to degrade 300 mL of acrylic acid wastewater. Under the irradiation of ultraviolet light, add 1ml H 2 o 2 , after 6 hours to degrade acrylic acid wastewater with a concentration of about 3000mg / L, the COD degradation rate is 94.9%.

Embodiment 3

[0025] Implementation Example 3: Accurately measure 9.37mL of 4mol / L TiCl 4 Put the solution into a 500mL beaker, add 124.9mL deionized water, add 0.5mL AEO-9, and then slowly add 3moL / lNH 3 Until the pH value is 8-9, age for 20 hours, wash with water until there is no Cl - Afterwards, exchange water with ethanol to obtain alcohol gel. After drying under the condition of 262 °C and 8.5 MPa, the ethanol reaches a supercritical state, and then calcinate the obtained catalyst in a muffle furnace at 500 °C for 1 hour to obtain nano-titanium dioxide photocatalyst. Put 3 g of this nano-titanium dioxide catalyst into a 500 mL beaker, add 10 mL of deionized water, add 0.5 mL of AEO-9, and drop 0.3 mol / L of Cd(NO 3 ) 2 Solution 6.25mL, then slowly add 3moL / lNH 3 Until the pH value is 8-9, age for 20 hours, wash with water until there is no Cl - Afterwards, ethanol was exchanged for water to obtain alcohol gel. After drying under the condition of 262°C and 8.5MPa, the ethanol reache...

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Abstract

The invention relates to a method used for preparing a binary-nano composite photo-catalyst which takes titanium dioxide as the main body, and the prepared catalyst is applied to the organic wastewater treatment. The preparation method is characterized in that the supercritical fluid drying technology or the common chemical drying technology is combined with four preparation methods of the coprecipitation method, the successive precipitation method, the surface coating method and the mechanical mixing method to prepare the nano composite photo-catalyst which takes the titanium dioxide as the main body, thereby enlarging the range of the spectral response, enabling the absorption wavelength of the catalyst to be shifted toward the visual light wavelength, and improving the quantum effect.

Description

technical field [0001] The invention relates to four different preparation methods for preparing binary nanometer composite photocatalysts with titanium dioxide as the main body. The focus is to prepare a binary nanocomposite photocatalyst with titanium dioxide as the main body by using four different preparation methods: supercritical fluid drying technology or common chemical drying technology combined with co-precipitation method, sequential precipitation method, surface coating method or mechanical mixing method. . The catalysts prepared by the four methods respectively use ultraviolet light and visible light as light sources, which can effectively degrade organic pollutants, not only improve the photocatalytic activity, but also reduce the recombination degree of photogenerated electrons and holes, and realize the TiO 2 The transfer of light absorption to visible light is an ideal catalyst for environmental pollution control. technical background [0002] In recent ye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J23/06B01J37/03
Inventor 张敬畅吴霞曹维良
Owner BEIJING UNIV OF CHEM TECH
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