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Preparation method of ZnO-TiO2 composite photocatalyst

A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems that no one has reported

Inactive Publication Date: 2012-09-12
黑龙江省金昇新能源与环境材料研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, many people have studied a large number of ZnO-TiO core-shell structures. However, no one has reported the method of using amorphous ZnO and TiO to improve the catalytic activity of TiO.

Method used

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  • Preparation method of ZnO-TiO2 composite photocatalyst
  • Preparation method of ZnO-TiO2 composite photocatalyst
  • Preparation method of ZnO-TiO2 composite photocatalyst

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Experimental program
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Effect test

specific Embodiment approach 1

[0027] Specific implementation mode 1: This implementation mode prepares ZnO-TiO according to the following steps 2 Preparation method of composite photocatalyst:

[0028] a. Take 1-10ml of titanium salt in absolute ethanol and stir, the titanium salt is tetrabutyl titanate, titanium tetrachloride, tetraethyl titanate or tetrapropyl titanate, etc., absolute ethanol and The volume ratio of titanium salt is between 1 and 4:1, that is, 10ml of butyl titanate can be added to 10ml, 20ml, 30ml, and 40ml of ethanol;

[0029] b. The amount of titanium salt remains unchanged. According to the Zn:Ti molar ratio of 1:1 to 10, respectively weigh the zinc salt in a beaker and dissolve it in 20ml deionized water; after stirring until it is completely dissolved, add ammonia water dropwise until the solution is just from turbid to For clarification, sodium hydroxide is added dropwise to adjust the pH range between 4 and 14, and the zinc salt is any inorganic salt of zinc such as zinc acetate...

specific Embodiment approach 2

[0033] Specific embodiment two: Measure 10ml of tetrabutyl titanate in 40ml of absolute ethanol and stir; the amount of butyl titanate remains unchanged, and zinc acetate is 1:1, 1:2, 1:1 according to the molar ratio of Zn:Ti 3. 1:5, 1:7 and 1:10 were weighed in a beaker and dissolved in 20ml of deionized water; after stirring until completely dissolved, add ammonia water dropwise until the solution was just from cloudy to clear; slowly add the mixed solution to In a mixed solution of tetrabutyl titanate and absolute ethanol; after continuing to stir for 2 hours, transfer the obtained solution to a 100ml autoclave and heat at a constant temperature of 120°C for 12 hours; naturally cool, centrifuge the obtained product, wash and dry , Grinding to obtain composite photocatalyst powders with different ratios of zinc and titanium.

[0034] 1. XPS analysis:

[0035] Depend on figure 1 It can be seen that the peak of O1s in the sample is obviously asymmetrical, which can be consid...

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Abstract

A preparation method of a ZnO-TiO2 composite photocatalyst relates to a method for preparing a ZnO-TiO2 composite photocatalyst by a hydro-thermal synthesis method. The invention aims to synthesize amorphous zinc oxide and titanium oxide composite nanoparticles by the adoption of a simple and ingenious method. The method comprises the following steps of: weighing titanates and placing it into anhydrous ethanol, stirring, weighing zinc salt and putting it into a beaker, and dissolving by the use of deionized water; after completely dissolving with stirring, adding dropwisely ammoniacal liquor until a solution just becomes clear from turbidity, and slowly and dropwisely adding the mixed solution into a mixed solution of titanates and anhydrous ethanol; continuously stirring and transferring the obtained solution into an autoclave for heating at constant temperature; naturally cooling, carrying out centrifugal separation on the obtained product, cleaning, drying and grinding to obtain the zinc-titanium composite photocatalyst powder. The activity of the obtained nanocomposite particles in the aspect of degrading methyl blue pollutants is much higher than that of its crystal form and commercial P25.

Description

technical field [0001] The present invention relates to a kind of hydrothermal synthesis method to prepare ZnO-TiO 2 Method for composite photocatalysts. Background technique [0002] In the past few years, wide-bandgap semiconductors have attracted extensive research due to their potential applications in many fields, such as photocatalysis, biomedicine, luminescence, single-electron transistors, solar cells, and optoelectronics. Although this nano-semiconductor has catalytic performance and ultra-fast nonlinear piezoelectric performance, its surface state is particularly easy to trap electrons and holes, which causes the non-radiative recombination of these carriers, thereby reducing its own catalytic performance. In order to overcome this defect, in recent years, due to the advantages of large quantum yield and easy growth of its photoluminescence, heterostructure nanomaterials have aroused people's enthusiastic interest in studying them, such as core-shell structured n...

Claims

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Application Information

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IPC IPC(8): B01J23/06
Inventor 韩松郭思瑶董诗渺毛海峰曾程辉
Owner 黑龙江省金昇新能源与环境材料研究院
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