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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  • 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

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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Example Embodiment

[0027] Specific embodiment 1: This embodiment 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 the titanium salt is between 1 and 4: 1, that is, 10ml of butyl titanate can be added to 10ml, 20ml, 30ml, 40ml of ethanol;

[0029] b. The amount of titanium salt remains unchanged. Weigh the zinc salt in a beaker according to the Zn:Ti molar ratio of 1:1~10, and dissolve it with 20ml of deionized water; after stirring until it is completely dissolved, add ammonia water until the solution is just turbid to To clarify, add dropwise sodium hydroxide to adjust the pH range between 4-14, and the zinc salt can be inorganic salts of zinc such as zinc acetate, zinc nitrate, and zinc chloride;

[0030] c. Slowly add the mi...

Example Embodiment

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

[0034] 1. XPS analysis:

[0035] by figure 1 It can be seen that the O1s peak in the sample is obviously asymmetric, which can be considered to be caused by TiO 2 O1s in the lattice oxyge...

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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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