A kind of preparation method of efficient photocatalyst srtio3

A photocatalyst and high-efficiency technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high cost, difficult recovery, and high reaction temperature. Low equipment requirements, simple process steps, and high photocatalytic activity

Inactive Publication Date: 2019-02-19
ANHUI UNIVERSITY
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AI Technical Summary

Problems solved by technology

The equipment and process of the solid-phase method are simple and convenient for industrial production, but the reaction temperature is high, and agglomeration is prone to occur, which is not conducive to the improvement of performance. The prepared photocatalyst products often need other experimental methods to improve their performance to meet high-standard use requirements. ; The hydrothermal method does not require high-temperature roasting and other treatment processes, and the preparation process is relatively simple, but the reaction is not complete, the reaction process is not easy to control, and the equipment requirements are very high
Thus SrTiO 3 Catalysts face problems such as complex preparation process steps, heavy pollution, high cost, low utilization rate of visible light, and difficulty in recycling.

Method used

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  • A kind of preparation method of efficient photocatalyst srtio3
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  • A kind of preparation method of efficient photocatalyst srtio3

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Efficient photocatalyst SrTiO 3 A preparation method comprising the steps of:

[0023] 1), put 3.2121g of strontium acetylacetonate, 3.2544g (3.39ml) of isopropyl titanate, 400ml of dibenzyl ether, 80ml of oleylamine and 80ml of oleic acid into a three-necked round-bottomed flask, in a protective atmosphere (99.9% high-purity nitrogen, the same below), magnetically stirred at 35° C. to dissolve completely.

[0024] 2) Under a protective atmosphere, the temperature was raised to 120°C, and then stirred at constant temperature for 1.5 hours.

[0025] 3) Under a protective atmosphere, the temperature was raised to 140° C., and then stirred at a constant temperature for 6 hours to prepare a strontium titanate precursor.

[0026] 4) Wash the strontium titanate precursor with absolute ethanol, then centrifuge and dry to obtain a powder. The drying temperature is 120° C. and the drying time is 4 hours.

[0027] 5) Calcining the powder in a muffle furnace at 400°C for 2 hour...

Embodiment 2～5

[0029] The only difference from Example 1 is that the calcination temperatures are 500°C, 600°C, 700°C, and 800°C in sequence.

[0030] Product performance characterization:

[0031] 1. X-ray diffraction test

[0032] Utilize X-ray powder diffractometer (XRD) to test respectively the strontium titanate photocatalyst material that embodiment 1~5 prepares, by figure 1 Compared with the standard PDF card (No.35-0734) in the position and relative intensity of each diffraction peak, the prepared sample is a strontium titanate photocatalytic material, and there is a trace amount of titanium dioxide; The improvement of catalytic performance has a great promotion effect, and each peak in the spectrum is sharp, indicating that the crystallization degree of the sample is good.

[0033] 2. UV test

[0034] The strontium titanate photocatalytic materials prepared in Examples 1 to 5 were respectively tested with an ultraviolet spectrophotometer (UV; UV-3600), and the forbidden band widt...

Embodiment 6

[0039] Efficient Photocatalyst SrTiO 3 A preparation method comprising the steps of:

[0040] 1), the oleic acid of the strontium acetylacetonate of 3.3526g, the isopropyl titanate of 3.1525g, the dibenzyl ether of 450ml, the oleylamine of 100ml and the oleic acid of 60ml are put in the three-necked round bottom flask, under protective atmosphere (99.9% high Pure nitrogen, the same below), magnetically stirred at 30°C to dissolve completely.

[0041] 2) Under a protective atmosphere, the temperature was raised to 100° C., and then stirred at constant temperature for 2 hours.

[0042] 3) Under a protective atmosphere, the temperature was raised to 120° C., and then stirred at a constant temperature for 8 hours to prepare a strontium titanate precursor.

[0043] 4) Wash the strontium titanate precursor with absolute ethanol, then centrifuge and dry to obtain a powder. The drying temperature is 90° C. and the drying time is 5 hours.

[0044] 5) Calcining the powder in a muffle...

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Abstract

A preparation method of high-efficiency photocatalyst SrTiO3 relates to the field of functional materials. The strontium titanate precursor is prepared by thermal decomposition through organic metal strontium salt and organic metal titanium salt, and then calcined to obtain high-efficiency photocatalyst SrTiO3. Mix strontium acetylacetonate, isopropyl titanate and an organic solvent, stir at 30-40°C to dissolve completely; heat up to 80-160°C, then stir at constant temperature for 1-2 hours; increase the temperature by 20°C, then Stirring at a constant temperature for 4-8 hours to prepare a strontium titanate precursor; washing the strontium titanate precursor, then centrifuging and drying to obtain a powder; calcining the powder at 300-900 ° C for 1-3 hours to obtain SrTiO3. The selected raw materials are safe and easy to obtain, the process steps are simple, pollution-free, and the equipment requirements are low. The prepared strontium titanate high-efficiency photocatalyst can effectively degrade the methylene blue solution, has high photocatalytic activity, and can be reused for many times.

Description

technical field [0001] The invention relates to the field of functional materials, in particular to a high-efficiency photocatalyst SrTiO 3 method of preparation. Background technique [0002] Photocatalytic degradation refers to the oxidative decomposition of organic pollutants under the irradiation of light (visible light or ultraviolet light), and finally degrades into small molecules such as carbon dioxide, water and inorganic ions. It is currently the most promising pollution treatment method. [0003] Strontium titanate (SrTiO 3 ) is a typical perovskite structure that can be used as a photocatalyst. As a functional material, it has been applied in environmental purification technologies such as photocatalytic treatment of water and gas-solid photocatalytic oxidation of environmental pollutants. Strontium titanate has It has the characteristics of high band gap (3.2eV), excellent photocatalytic activity, and unique electromagnetic properties and redox catalytic activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/02C02F1/30
CPCB01J23/02B01J35/004C02F1/30C02F2101/36C02F2101/38C02F2101/40C02F2305/10
Inventor 郑赣鸿目晶晶戴振翔张凌云朱亚男
Owner ANHUI UNIVERSITY
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