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Preparation method of nano-sized gold/ titanium dioxide compound mesoporous microspheric photocatalyst

A titanium dioxide and photocatalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high semiconductor carrier recombination rate, absorption and utilization wavelength range narrow, scarce photocatalytic activity, etc., to achieve the effect of enhanced visible light catalytic activity, easy mass transfer, and strong corrosion resistance

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But from TiO 2 From the perspective of the efficiency of solar energy, there are still many shortcomings: one is that the wavelength range of light absorption and utilization is narrow, mainly in the ultraviolet region, and there is no photocatalytic performance for visible and infrared regions, and the light utilization rate is low; the other is that semiconductors carry current High sub-recombination rate, low quantum efficiency
But in the existing research Au / TiO 2 Research on photocatalytic activity is still very scarce

Method used

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  • Preparation method of nano-sized gold/ titanium dioxide compound mesoporous microspheric photocatalyst
  • Preparation method of nano-sized gold/ titanium dioxide compound mesoporous microspheric photocatalyst
  • Preparation method of nano-sized gold/ titanium dioxide compound mesoporous microspheric photocatalyst

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Experimental program
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Embodiment 1

[0030] a. Using the existing solvothermal method to pre-synthesize monodisperse oil phase titanium dioxide nanocrystals. Dissolve 1 mL of tetrabutyl titanate in a mixed solution of 7 mL of oleic acid and 20 mL of cyclohexane, then add about 5 mL of triethylamine, and stir evenly to obtain a clear and transparent solution. Transfer this solution to a hydrothermal kettle with a polytetrafluoroethylene liner, tighten the lid of the kettle, heat treatment at a high temperature of 160°C for 24 hours, add ethanol solution to precipitate, and dissolve back with cyclohexane to obtain monodisperse oil phase titanium dioxide nanocrystals ;

[0031] b. Using the existing solvothermal method to pre-synthesize monodisperse oil-phase gold nanocrystals. Dissolve chloroauric acid in oleylamine to make a 20g / L chloroauric acid oleylamine solution, take the gold solution and toluene, mix and stir evenly at a ratio of 1:2, transfer it to a hydrothermal kettle, and conduct a hydrothermal treatme...

Embodiment 2

[0036] a. Using the existing solvothermal method to pre-synthesize monodisperse oil phase titanium dioxide nanocrystals. Dissolve 1 mL of tetrabutyl titanate in a mixed solution of 7 mL of oleic acid and 20 mL of cyclohexane, then add about 5 mL of triethylamine, and stir evenly to obtain a clear and transparent solution. Transfer this solution to a hydrothermal kettle with a polytetrafluoroethylene liner, tighten the lid of the kettle, conduct high-temperature hydrothermal treatment for 24 hours, add ethanol solution for precipitation, and dissolve back with cyclohexane to obtain monodisperse oil-phase titanium dioxide nanocrystals;

[0037] b. Using the existing solvothermal method to pre-synthesize monodisperse oil-phase gold nanocrystals. Dissolve chloroauric acid in oleylamine to make a 20 g / L chloroauric acid oleylamine solution, mix the gold solution and toluene at a ratio of 1:2 and stir evenly, then transfer it to a hydrothermal kettle, and conduct a low-temperature h...

Embodiment 3

[0043] a. Using the existing solvothermal method to pre-synthesize monodisperse oil phase titanium dioxide nanocrystals. Dissolve 1 mL of tetrabutyl titanate in a mixed solution of 7 mL of oleic acid and 20 mL of cyclohexane, then add about 5 mL of triethylamine, and stir evenly to obtain a clear and transparent solution. Transfer this solution to a hydrothermal kettle with a polytetrafluoroethylene liner, tighten the lid of the kettle, conduct high-temperature hydrothermal treatment for 24 hours, add ethanol solution for precipitation, and dissolve back with cyclohexane to obtain monodisperse oil-phase titanium dioxide nanocrystals;

[0044] b. Using the existing solvothermal method to pre-synthesize monodisperse oil-phase gold nanocrystals. Dissolve chloroauric acid in oleylamine to make a 20 g / L chloroauric acid oleylamine solution, mix the gold solution and toluene at a ratio of 1:2 and stir evenly, then transfer it to a hydrothermal kettle, and conduct a low-temperature h...

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Abstract

The invention discloses a preparation method of nano-sized gold / titanium dioxide compound mesoporous microspheric photocatalyst, and belongs to the technical field of catalysts. The preparation method comprises the following steps: mixing monodisperse oil-phase titanium dioxide nanocrystal and a monodisperse oil-phase gold nanocrystal in a mass ratio of gold to titanium dioxide of (0.5-15): 100; adding the mixture into an aqueous solution in which sodium dodecyl sulfate is dissolved; crushing the mixture by using an ultrasonic crushing device to obtain a microemulsion; completely evaporating an organic solvent in an oil bath at 50-80 DEG C, centrifugating, eluting and drying; and calcining dried powder to obtain the gold-doped nano-sized titanium dioxide mesoporous sphere. Components of the prepared nano-sized gold / titanium dioxide compound mesoporous microsphere keep respective microscopic shapes; and the two nanocrystals are assembled by the microemulsion method to form a special mesoporous structure, so that the specific surface is large, the mass transfer is easy and the photocatalysis easily occurs on the surface of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and the photocatalyst prepared by a method for preparing a nano-gold / titanium dioxide composite mesoporous microsphere photocatalyst can be effectively used in the field of visible light catalytic degradation of organic dye wastewater. Background technique [0002] With the acceleration of industrialization, the problem of environmental pollution has become increasingly serious, and water pollution has attracted widespread attention worldwide. A large part of water pollution is due to the arbitrary discharge of organic pollutants, which are not easy to separate and degrade. The chemical degradation of organic pollutants developed in recent years is a hot spot, among which photocatalytic degradation has the advantages of low energy consumption, full degradation, and no toxic products. Therefore, the research and development of new and more efficient nano-photocatalysts is an important direction...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/08C02F1/32C02F103/30
CPCY02W10/37
Inventor 刘军枫王冠男孙晓明
Owner BEIJING UNIV OF CHEM TECH
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