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Hydroxyl-modified oxygen-vacancy strontium titanate photocatalytic material and its preparation and application

A catalytic material, the technology of strontium titanate, applied in the application of photoreduction of carbon dioxide, the field of preparation of strontium titanate photocatalytic materials, can solve the problem that strontium titanate can only use ultraviolet light, etc., to reduce the thermodynamic barrier and stabilize Enhanced performance and improved photocatalytic efficiency

Inactive Publication Date: 2019-06-25
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art, the present invention provides a hydroxyl-modified strontium titanate photocatalyst material containing oxygen vacancies and its preparation and application, which solves the problem that strontium titanate itself can only use ultraviolet light in the prior art

Method used

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  • Hydroxyl-modified oxygen-vacancy strontium titanate photocatalytic material and its preparation and application
  • Hydroxyl-modified oxygen-vacancy strontium titanate photocatalytic material and its preparation and application

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Embodiment 1

[0030] Preparation of hydroxyl-modified strontium titanate containing oxygen vacancies: Weigh 0.3g of commercial strontium titanate and 0.1g of sodium borohydride, grind them evenly, transfer them to a tube furnace for sintering at 300°C with argon for one hour; centrifuge the sintered samples Separation, washing with deionized water several times to remove residual sodium borohydride, and drying to obtain a sample containing oxygen vacancies, labeled as STO-NaBH 4 ;Weigh 0.1g STO-NaBH 4 Add 10ml of deionized water and ultrasonicate for half an hour to obtain evenly dispersed colloidal strontium titanate; weigh 0.1g of sodium hydroxide, add 10ml of deionized water to dissolve, and prepare a standard solution of sodium hydroxide. Use a pipette gun to pipette 5% sodium hydroxide solution into the strontium titanate colloid, sonicate for a few seconds, then transfer the obtained mixture to a vacuum drying oven at 60°C for 24 hours, and grind to obtain the final sample.

[0031] ...

Embodiment 2

[0036] Effect of the amount of alkali metal hydroxide on the product: Weigh five parts of 0.1g oxygen-vacancy strontium titanate samples (STO-NaBH 4 , synthesized according to Example 1), add 10ml of deionized water, ultrasonic for half an hour, uniformly disperse, and then add mass fractions of 0%, 1%, 3%, 5%, and 7% respectively in five samples Sodium hydroxide, after a few seconds of ultrasonication, put it into a vacuum drying oven at 60°C for 24 hours in a vacuum, and grind to obtain the final product. Through the structural analysis of the product in this case and the evaluation of photoreduction carbon dioxide activity, it can be seen that when the mass fraction of sodium hydroxide is 5%, the photoreduction activity of the product is optimal, which can be attributed to the number of hydroxyl groups reaching a better value.

Embodiment 3

[0038] Influence of the type of alkali metal hydroxide on the product: Weigh three 0.1g samples of strontium titanate containing oxygen vacancies (STO-NaBH 4 , synthesized according to Example 1), add 10ml of deionized water for ultrasonic dispersion, then add lithium hydroxide, sodium hydroxide, and potassium hydroxide with a mass fraction of 5% respectively, and put them into a vacuum drying oven at 60°C under vacuum after ultrasonic Dry for 24 hours and grind to get the final product. According to the structural analysis of the product in this case and the evaluation of photoreduction carbon dioxide activity, it can be known that the reduction performance of the sample is the best when the alkali metal hydroxide used is sodium hydroxide.

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Abstract

The invention discloses a hydroxyl-modified oxygen vacancy-containing strontium titanate photocatalytic material as well as preparation and application thereof. The surface of the photocatalytic material contains oxygen vacancy for enhancing light absorption capacity and is grafted with a hydroxyl group. The preparation method comprises the following steps: by taking sodium borohydride and commercial strontium titanate as raw materials, treating the raw materials in a tube furnace at the temperature of 280-350 DEG C for a certain period of time, centrifuging, washing and drying the product, so as to obtain an oxygen vacancy-containing strontium titanate photocatalytic material; and adding 0-7 mass percent of alkali metal hydroxides for alkalifying. According to the method, the material absorption is expanded to infrared due to simple sodium borohydride treatment, a hydroxylated surface is formed by the catalyst due to a small amount of alkali, the adsorption and activation capacity on carbon dioxide is enhanced, the method is simple and easy to operate, and the obtained product has excellent capacity of performing photocatalytic reduction on the carbon dioxide.

Description

technical field [0001] The invention relates to a photocatalytic material and its preparation method and application, in particular to a strontium titanate photocatalytic material (SrTiO 3 ) preparation method and application in photoreduction of carbon dioxide. Background technique [0002] The continuous increase of carbon dioxide content in the atmosphere and the continuous consumption of fossil fuels make human beings face energy and environmental problems such as global warming and energy shortage. As a new energy and environmental purification technology, photocatalysis has attracted more and more attention. However, one of the key obstacles to the practical application of traditional photocatalysts is their low light energy utilization efficiency. From this perspective, the design can use Photocatalytic materials for visible and near-infrared light are of great significance for the realization of light energy conversion and environmental restoration. At present, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/02C01B32/40C01B3/02
CPCB01J23/002B01J23/02B01J35/004C01B3/02C01B2203/06C01B2203/1041
Inventor 颜春蕾欧阳述昕许华胡慧林陈华予
Owner TIANJIN UNIV
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