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Hydrophobicity visible-light response type nano TiO2 photocatalyst and preparation method thereof

A photocatalyst and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of slow reaction rate, limited application, and low photocatalytic quantum efficiency and other issues to achieve the effect of improving quantum utilization efficiency

Inactive Publication Date: 2009-06-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the liquid phase reaction system, the recombination of photogenerated electrons and holes and the digestion of free radicals are very fast, resulting in low photocatalytic quantum efficiency and slow reaction rate, which limits the application of this technology.

Method used

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  • Hydrophobicity visible-light response type nano TiO2 photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1: SDS load is 0.2g / g TiO 2 , the CuO loading is 0.8g / g TiO 2 Hydrophobic visible light responsive TiO 2 Preparation process of photocatalyst material:

[0033] Measure 10ml of tetra-n-butyl titanate and 30ml of absolute ethanol to make stock solution, weigh 0.5gSDS, 6.05gCu(NO 3 ) 2· 3H 2 O was made into 10ml solutions respectively, and 20ml and 7.5ml of absolute ethanol and glacial acetic acid were measured respectively, and mixed with Cu(NO 3 ) 2 solution and SDS solution together to form a titration solution;

[0034] Preparation method 1: drop method

[0035] Under vigorous stirring at 20°C-30°C, slowly drop the titration solution into the original solution, and continue stirring for 30 minutes after the titration is completed.

[0036] Aged at room temperature for 1 day, dried in an oven at 100°C to 105°C, ground, passed through a 200-mesh sieve, and placed in N at 400°C 2and air atmosphere for 4h (heating rate of 2.5 ° C / min), the obtained c...

Embodiment 2

[0041] Embodiment 2: SDS load is 0.92g / g TiO 2 , the CuO loading is 3.2g / g TiO 2 Hydrophobic visible light responsive TiO 2 Preparation process of photocatalyst material:

[0042] Measure 10ml of tetra-n-butyl titanate and 40ml of absolute ethanol to make a stock solution, weigh 2.3g of SDS, 24.2g of Cu(NO 3 ) 2· .3H2O was made into 15ml and 20ml solutions respectively, measured absolute ethanol, glacial acetic acid 40ml and 15ml respectively, and mixed with Cu(NO 3 ) 2 solution and SDS solution together to form a titration solution;

[0043] Preparation method 1: drop method

[0044] Under vigorous stirring at 20°C-30°C, slowly drop the titration solution into the original solution, and continue stirring for 45 minutes after the titration is completed. Aged at room temperature for 2 days, dried in an oven at 100°C to 105°C, ground, passed through a 200-mesh sieve, and placed in N at 450°C 2 Calcined in air atmosphere for 5h (heating rate: 2.5°C / min), the obtained cata...

Embodiment 3

[0049] Embodiment 3: SDS load is 2g / g TiO 2 , the CuO loading is 8g / g TiO 2 Hydrophobic visible light responsive TiO 2 Preparation process of photocatalyst material:

[0050] Measure 10ml of tetra-n-butyl titanate and 60ml of absolute ethanol to make stock solution, weigh 5gSDS, 60.5gCu(NO 3 ) 2· 3H 2 O was made into 30ml and 40ml solutions respectively, measured absolute ethanol, glacial acetic acid 80ml and 30ml respectively, and mixed with Cu(NO 3 ) 2 solution and SDS solution together to form a titration solution;

[0051] Preparation method 1: drop method

[0052] Under vigorous stirring at 20°C-30°C, slowly drop the titration solution into the stock solution, and continue stirring for 60 minutes after the titration is completed. Aged at room temperature for 2 days, dried in an oven at 100°C to 105°C, ground, passed through a 200-mesh sieve, and placed in N at 500°C 2 and air atmosphere for 6h (heating rate of 2.5 ° C / min), the obtained catalysts were recorded ...

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Abstract

The invention provides a hydrophobic visible light response type nano TiO2 photocatalyst, wherein visible light is modified by utilizing CuO to load TiO2, and the loading amount of the CuO is between 0.4 and 14 g / g TiO2; sodium dodecylsulfate SDS is utilized to perform hydrophobic modification on the surface of CuO / TiO2, and the loading amount of the SDS is between 0.2 and 4 g / g TiO2; and the specific surface area of the catalyst is between 200 and 400 m2 / g, and the average grain diameter is between 10 and 40 nanometers. The SDS is absorbed on the surface of the catalyst, and residual stable hydrophobic groups after calcination make the CuO / TiO2 have hydrophobicity, change the 'amphiphilic' property of the TiO2 photocatalyst into hydrophobic selectivity, and can make difficultly biodegraded organic substances in aqueous phase have the advantage of competitive adsorption and be preferably degraded. Simultaneously, the loaded CuO composition can make absorption edges of the TiO2 subjected to redshift, realize electronic cavity separation under visible light radiation, and improve the utilization rate of quanta.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a material for purifying sewage and wastewater by using the principle of photocatalysis and a preparation technology thereof. Background technique [0002] Semiconductor photocatalytic sewage purification technology is a new sewage treatment technology developed by making full use of the special valence band structure of semiconductor materials. There is a forbidden band between the conduction band and the valence band of the semiconductor material. When the energy of the irradiated photons is greater than the energy of the forbidden band width, the electrons on the valence band of the semiconductor powder absorb the photons and jump to the conduction band (e - ), leaving a hole in the valence band (h + ), forming electron-hole pairs, the electrons are reducing, and the holes are oxidizing. The more negative the oxidation-reduction potential on the conduction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J21/06C02F1/30
Inventor 吉芳英范子红徐璇何莉
Owner CHONGQING UNIV
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