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Composite photocatalytic material and preparation method and application thereof

A composite photocatalysis and oxide technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of limited reaction active sites, insufficient catalytic efficiency, difficult separation, etc. The effect of light energy utilization and photocatalytic efficiency, excellent electron transport performance, and fast mass transfer

Active Publication Date: 2021-11-12
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004]Therefore, the technical problem to be solved in the present invention is to overcome the insufficient catalytic efficiency, difficulty in separation, and reactive activity of photocatalytic materials that simultaneously remove organic pollutants and heavy metals in the prior art. Site-limited defects, thus providing a new type of composite photocatalytic material and its preparation method and application

Method used

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  • Composite photocatalytic material and preparation method and application thereof
  • Composite photocatalytic material and preparation method and application thereof
  • Composite photocatalytic material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a method for preparing a composite photocatalytic material, the steps are as follows:

[0053] (1) Porous carbon foam (scanning electron microscope picture as figure 1 As shown in a) cut into 3cm×3cm size, ultrasonic cleaning in 2mol / L nitric acid, 1.5mol / L acetone, absolute ethanol and deionized water in sequence, each solvent was cleaned for 15 minutes (power 100W), and dried naturally;

[0054] (2) prepare respectively the ethanol solution of tungsten hexachloride, the aqueous solution of sodium tungstate, platinum nitrate solution and sodium citrate solution, wherein, the molar concentration of tungsten salt in the ethanol solution of tungsten hexachloride is 0.02mol / L, will The ethanol solution of tungsten hexachloride and the hydrogen peroxide solution are mixed according to the volume ratio of 10:1 to obtain the mixed solution of the ethanol solution of tungsten hexachloride and the hydrogen peroxide solution; the molar concentration of t...

Embodiment 2

[0059] This embodiment provides a method for preparing a composite photocatalytic material, the steps are as follows:

[0060] (1) Porous carbon foam (scanning electron microscope picture as figure 1 As shown in a) cut into 3cm×3cm size, ultrasonic cleaning in 1mol / L nitric acid, 1mol / L acetone, absolute ethanol and deionized water in sequence, each solvent was cleaned for 15 minutes (power 50W), and dried naturally;

[0061] (2) prepare ethanol solution of zinc acetate, zinc nitrate aqueous solution, hexamethylenetetramine solution, silver nitrate solution and sodium citrate solution respectively, wherein, the molar concentration of zinc salt in the ethanol solution of zinc acetate is 0.01mol / L The molar concentration of the zinc nitrate aqueous solution is 10mmol / L, and the molar concentration of the hexamethylene tetraammonium solution is 8mmol / L, and the zinc nitrate aqueous solution and the hexamethylene tetraammonium solution are mixed according to a volume ratio of 1:2 ...

experiment example 1

[0066] This experimental example is used to verify the removal effect of the composite photocatalytic material prepared in Example 1 on bisphenol A (PBA) and heptavalent manganese (Mn(VII)) in drinking water. The composite photocatalytic material prepared in Example 1 is used as the experimental object, denoted as Pt / WO 3 / CF group. As a contrast, the load WO 3 Carbon foam of nanowire arrays (denoted as WO 3 / CF group) and the porous carbon foam (referred to as CF group) obtained by the step (1) of Example 1 for experimentation. The experimental method is as follows:

[0067] Take 3 parts of drinking water samples to be treated containing 20mg / L BPA (recorded as drinking water sample 1), 3 parts of drinking water samples to be treated containing 20mg / L Mn(VII) (recorded as drinking water samples 2), 3 parts of drinking water samples containing 20mg / L Mn(VII) Part of the drinking water sample (recorded as drinking water sample 3) containing 20mg / L BPA and 20mg / L Mn(VII) to ...

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Abstract

The invention provides a composite photocatalytic material and a preparation method and application thereof, and relates to the field of water treatment. The composite photocatalytic material comprises foamy carbon, a metal oxide nano array and noble metal nano particles. A metal oxide nano array is grown on a foamy carbon substrate in situ through an impregnation method-hydrothermal method, and then noble metal nanoparticles are loaded on the metal oxide nano array through a chemical reduction method, so that the three-dimensional porous hierarchical structure composite photocatalytic material with high specific surface area, moderate pore structure and rich active sites is formed. The material is used for carrying out photocatalytic oxidation treatment on heavily-polluted wastewater containing high-valence heavy metals and organic pollutants, the high-valence heavy metals and organic matters can be removed at the same time, the operation process is simple, the material price is low, other sacrificial agents do not need to be added, the treatment cost is low, the catalytic performance is relatively high, and the stability is good; the material can be applied to advanced treatment engineering of high-valence heavy metal and organic matter combined pollution in drinking water, industrial wastewater and natural water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite photocatalytic material and its preparation method and application. Background technique [0002] With the development of industry, more and more pollutants enter the environment, making the types of pollutants in water intricate. The most typical one is the coexistence of organic pollutants and heavy metals. Although different water pollution control technologies have been developed for different pollutants, such as the efficient removal of refractory organic pollutants in water by Fenton or biotechnology, and the removal of heavy metals in water by adsorption or coagulation technologies. However, it is still a difficult problem to realize the removal of organic pollutants and heavy metals simultaneously by a single technical means. In order to meet the new challenges of compound pollution, it is urgent and important to find an efficient water pollution cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/60C02F1/30B01J35/10B01J37/02C02F101/20C02F101/30
CPCB01J23/6527B01J23/60C02F1/30B01J37/0201C02F2305/10C02F2101/30C02F2101/20B01J35/39B01J35/61B01J35/60Y02W10/37
Inventor 刘会娟梁贺刘锐平安晓强兰华春曲久辉
Owner TSINGHUA UNIV
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