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Normal-temperature preparation method of {001} surface anatase TiO2 monocrystals

An anatase and single crystal technology, applied in the field of photocatalytic materials, can solve the problems of complex preparation process and energy consumption, and achieve the effect of promoting complete hydrolysis, simple device and inhibiting polymerization

Inactive Publication Date: 2015-01-14
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process often requires a hydrothermal temperature above 100°C or burning (such as patents 201010231407.7, 201310134847.4, 201210083319.6, etc.) to complete, and the preparation process is complex and energy-consuming.

Method used

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  • Normal-temperature preparation method of {001} surface anatase TiO2 monocrystals
  • Normal-temperature preparation method of {001} surface anatase TiO2 monocrystals
  • Normal-temperature preparation method of {001} surface anatase TiO2 monocrystals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] ① Measure 30.4mL of absolute ethanol and add it to 35.2mL of butyl titanate, and record it as solution A;

[0028] ② Take 30.4mL of absolute ethanol and add it to 180mL of water, and add 20.2mL of HF at the same time, and record it as solution B;

[0029] ③ Add solution B to solution A drop by drop, control the drop rate at 2-3 drops per second, mix and stir at low speed for 2 hours to obtain TiO 2 Sol, aged at room temperature;

[0030] ④The aged 2d TiO 2 The sol was centrifugally settled, washed repeatedly with distilled water and ethanol three times, dried in a blast drying oven at 100°C, and ground to obtain TiO 2 powder.

[0031] Catalyst photocatalytic activity test method: The photocatalytic activity of the catalyst was evaluated by visible light photocatalytic degradation of methylene blue solution with an initial concentration of 20mg / L. The specific steps are: weigh 1g of catalyst powder and add it to 100mL of methylene blue solution, let it stand in the d...

Embodiment 2

[0034] ① Measure 30.4mL of absolute ethanol and add it to 35.2mL of butyl titanate, and record it as solution A;

[0035] ② Take 30.4mL of absolute ethanol and add it to 180mL of water, and add 20.2mL of HF at the same time, and record it as solution B;

[0036] ③ Add solution B to solution A drop by drop, control the drop rate at 2-3 drops per second, mix and stir at low speed for 1.5 hours to obtain TiO 2 Sol, aged at room temperature;

[0037] ④The aged 2d TiO 2 The sol was centrifugally settled, washed repeatedly with distilled water and ethanol three times, dried in a blast oven at 80°C, and ground to obtain TiO 2 powder.

[0038] The photocatalytic activity test method of the catalyst is the same as in Example 1.

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Abstract

The invention discloses a normal-temperature preparation method of {001} surface anatase TiO2 monocrystals. The normal-temperature preparation method is implemented by adopting the following technical scheme: dropping a mixed solution of absolute ethyl alcohol and butyl titanate into a mixed solution of absolute ethyl alcohol, deionized water and HF to obtain TiO2 sol, aging at the room temperature for 24 hours so as to obtain aged TiO2 gel, performing centrifugal settling on the aged TiO2 gel, washing the TiO2 gel by distilled water and absolute ethyl alcohol for three times, drying and grinding to obtain the anatase TiO2 monocrystal with an exposed {001} surface. The preparation method is basically implemented at the room temperature; the process is simple; the reaction is mild and the method is easy to control; a prepared catalyst is relatively high in catalysis activity and can be used for performing photocatalytic degradation on volatile organic matters and degradation-resistant organic matters.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a {001} plane anatase TiO 2 Normal temperature preparation method of single crystal. Background technique [0002] TiO 2 Due to the advantages of strong oxidation ability, high catalytic activity, stable physical and chemical properties, low price, and non-toxicity, it is widely used in photocatalytic fields such as wastewater treatment, air purification, and sterilization and self-cleaning. [0003] The application of titanium dioxide is closely related to its crystal structure and surface properties. Titanium dioxide is a polymorphic compound, and there are three crystal forms in nature: rutile, anatase and brookite. Studies have shown that three crystal forms of TiO 2 The order of relative photoactivity is: anatase (AT) >> rutile (RT) >> brookite (BT) type TiO 2 . For the anatase crystal form of TiO 2 For crystals, its different crystal face...

Claims

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Application Information

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IPC IPC(8): B01J21/06C01G23/047
Inventor 侯晨涛丁家国张倩云王炎
Owner XIAN UNIV OF SCI & TECH
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