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Method for preparing porous hollow monocrystal strontium titanate

A strontium titanate, single crystal technology, applied in titanate, chemical instruments and methods, alkaline earth metal titanate, etc., can solve the problems of unfavorable photogenerated charge transport, photocatalytic water splitting reaction, etc.

Pending Publication Date: 2022-01-25
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on hollow materials is mostly concentrated on the binary system, and most of the shell walls are polycrystalline structures composed of particles, which is not conducive to the transport of photogenerated charges and the efficient progress of photocatalytic water splitting reactions.

Method used

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  • Method for preparing porous hollow monocrystal strontium titanate
  • Method for preparing porous hollow monocrystal strontium titanate
  • Method for preparing porous hollow monocrystal strontium titanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In this example, porous hollow single-crystal strontium titanate was prepared by using methanol as a shape control agent.

[0026] The preparation process of the carbon sphere template: first prepare a glucose solution with a concentration of 0.5mol / L, take 44ml and put it into a 50ml polytetrafluoroethylene reactor, the water heating time is 6h, and the temperature is 180°C.

[0027] Preparation of porous hollow single crystal strontium titanate: 0.26ml of TiCl 4 Add dropwise into 25ml of deionized water containing 2g of methanol, mix well, add 90mg of carbon spheres, and ultrasonically mix it, then add 4g of LiOH·H 2 O in 30ml deionized water, after stirring for 30min, add 10ml containing 0.7g SrCl 2 ·6H 2 O solution, after stirring for 30 minutes, the solution was transferred to a 100ml polytetrafluoroethylene reactor, the hydrothermal reaction temperature was 180°C, and the reaction time was 24h. The sample was collected by centrifugation with deionized water to o...

Embodiment 2

[0029] On the basis of Example 1, porous hollow single-crystal strontium titanate with different shapes was obtained by adjusting the amount of carbon sphere template.

[0030] The preparation process of the carbon sphere template: first prepare a glucose solution with a concentration of 0.5mol / L, take 44ml and put it into a 50ml polytetrafluoroethylene reactor, the water heating time is 6h, and the temperature is 180°C.

[0031] Preparation of porous hollow single crystal strontium titanate: 0.26ml of TiCl 4 Add dropwise to 25 ml of deionized water containing 2 g of methanol. After mixing evenly, add 200 mg of carbon spheres, mix it ultrasonically, and add 4 g of LiOH·H 2 O in 30ml deionized water, after stirring for 30min, add 10ml containing 0.7g SrCl 2 ·6H 2 O solution, after stirring for 30 minutes, the solution was transferred to a 100ml polytetrafluoroethylene reactor, the hydrothermal reaction temperature was 180°C, and the reaction time was 24h. The sample was coll...

Embodiment 3

[0033] In this example, the porous hollow strontium titanate prepared by taking 1,2-propanediol as an example, the preparation process is similar to that of Example 1 and Example 2.

[0034] The preparation process of the carbon sphere template: first prepare a glucose solution with a concentration of 0.5mol / L, take 44ml and put it into a 50ml polytetrafluoroethylene reaction kettle, the water heating time is 6h, and the temperature is 180°C.

[0035] Preparation of porous hollow samples: 0.26ml TiCl 4 Add dropwise to 1 g of 1,2-propanediol in 25 ml of deionized water. After mixing evenly, add 200 mg of carbon spheres, mix it ultrasonically, and then add 4 g of LiOH·H 2 O in 30ml deionized water, after stirring for 30min, add 10ml containing 0.7g SrCl 2 ·6H 2 O solution, after stirring for 30 minutes, the solution was transferred to a 100ml polytetrafluoroethylene reactor. The hydrothermal reaction temperature was 180°C, and the reaction time was 12 hours. Octahedral solid...

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Abstract

The invention relates to the field of preparation of porous hollow single-crystal strontium titanate, in particular to a method for preparing porous hollow single-crystal strontium titanate by using carbon spheres as a template and adopting a hydrothermal reaction. The method comprises the following steps: on the basis that a large number of precursor ions by utilizing abundant functional groups on the surface of a carbon sphere template, carrying out hydrothermal growth on the surface of the carbon sphere template and coating single crystal strontium titanate with an exposed specific crystal face; and removing the template through heat treatment to obtain the porous hollow single crystal strontium titanate material. Transportation of photo-generated charges is promoted by means of the single crystal characteristic of the material, reaction active sites are increased through the porous structure, space deposition of double promoters is achieved through the cavity structure, photo-generated charge separation is promoted, and therefore the problem that the photo-generated charges are prone to compounding in the photo-catalytic reaction, and consequently the photo-catalytic efficiency is low is solved. At present, the reported porous hollow sample is mostly of a spherical structure composed of polycrystalline particles. Compared with the prior art, the porous hollow single-crystal strontium titanate sample prepared by the hydrothermal method has a specific exposed crystal face and has single-crystal and porous characteristics, so that the photocatalytic reaction is facilitated, and the photocatalytic full water splitting efficiency is improved.

Description

technical field [0001] The invention relates to the field of preparation of porous hollow single-crystal strontium titanate, in particular to a preparation method for preparing porous hollow single-crystal strontium titanate by using template method hydrothermal growth. Background technique [0002] Strontium titanate (SrTiO 3 ) is a typical perovskite-type composite oxide. Due to its high stability, non-toxicity and suitable energy band structure, it has received extensive attention since it was first reported to have photocatalytic hydrogen production activity in total water splitting. For the porous hollow single crystal structure, its porosity can provide more active sites and material exchange channels, the single crystal can reduce the transfer resistance of photogenerated charges, and the hollowness helps the rapid separation of photogenerated charges. The photocatalytic reaction proceeds. At present, most researches on hollow materials focus on binary systems, and ...

Claims

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Application Information

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IPC IPC(8): C01G23/00B01J23/02
CPCC01G23/006B01J23/02C01P2002/72C01P2004/03C01P2004/04B01J35/39
Inventor 吴亭亭崔春丽李娜王磊
Owner QINGDAO UNIV OF SCI & TECH
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