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Double-heterostructure photocatalyst and application and preparation method thereof

A double heterostructure, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, nanotechnology for materials and surface science, etc. Experimental performance, effect on the ability to promote separation, good photodegradation of pollutants, and photosplit water for hydrogen production

Active Publication Date: 2017-08-18
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is also the expensiveness of precious metals that limits the popularization and application of photo-splitting water to produce hydrogen to a large extent.

Method used

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  • Double-heterostructure photocatalyst and application and preparation method thereof
  • Double-heterostructure photocatalyst and application and preparation method thereof
  • Double-heterostructure photocatalyst and application and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] SrTiO 3 Synthesis of nanocubes: Add 9g of complex alkali (5.12gKOH and 3.88g NaOH), 1mmol SrCO to three 25mL Teflon jars 3 , 1mmol of commercial titanium dioxide, and then add 2mL, 3mL, 5mL of deionized water respectively, put them into the reactor, react at 200 ℃ for 48 hours, after cooling, collect the resulting sample, wash with deionized water to neutral, at 55 Dry for 3 hours at ℃ to obtain the required SrTiO 3 Micro-nano crystals. After comparison, it is found that when adding water to 3mL, the obtained SrTiO 3 Nano cubes have the most uniform particle size.

Embodiment 2

[0037] SrTiO 3 Synthesis of nanocubes: Add 9g of complex alkali (5.12gKOH and 3.88g NaOH), 1mmol SrCO to two 25mL Teflon jars 3 , 1mmol of commercial titanium dioxide, and then add 3mL of deionized water, put them into the reactor, and react at 180℃ and 220℃ respectively for 48 hours. After cooling, collect the obtained samples and wash them with deionized water to neutrality. Dry for 3 hours at ℃ to obtain the required SrTiO 3 Micro-nano crystals.

Embodiment 3

[0039] SrTiO 3 Synthesis of nanocubes: Add 9g of complex alkali (5.12gKOH and 3.88g NaOH), 0.1mmol SrCO to two 25mL Teflon jars 3 , 1mmol of commercial titanium dioxide, and then add 3mL of deionized water, put them into the reactor, and react at 180℃ and 220℃ respectively for 48 hours. After cooling, collect the obtained samples and wash them with deionized water to neutrality. Dry for 3 hours at ℃ to obtain the required SrTiO 3 Micro-nano crystals.

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Abstract

The invention discloses a double-heterostructure photocatalyst and application and a preparation method thereof, and relates to a TiO2 (titanium dioxide) / metal / SrSO4 (strontium sulfate) double-heterostructure material, and application in photodegradation of pollutants and photolysis of water for hydrogenation. The preparation method comprises the following steps of (1) synthesizing of heterostructure TiO2 / SrSO4 material: using nanometer SrTiO3 (strontium titanate) as a raw material, adding excessive sulfate solution, uniformly stirring, adding into a container, then placing into a reaction kettle to react, and cleaning and drying an obtained sample; (2) synthesizing of double-heterostructure TiO2 / Ag (silver) / SrSO4: adding the heterostructure TiO2 / SrSO4 material into deionized water, adding a noble metal solution, uniformly stirring and mixing, and enabling the noble metal and the TiO2 / SrSO4 material to react under UV irradiation according to a weight ratio of 1 to (2 to 64), cleaning and drying after the reaction, so as to obtain a product. The preparation method has the advantages that the separation of photo-induced electron cavity pairs is greatly promoted; because of the factors of special structure of SrSO4 and the like, the ability of photodegradation of pollutants and photolysis of water for hydrogenation is greatly improved.

Description

Technical field [0001] The invention relates to a double heterostructure photocatalyst and its application and preparation method, belonging to the field of catalysts. Background technique [0002] Environmental pollution and energy crisis have become two major problems restricting the development of human society. Titanium Dioxide (TiO 2 ) Is a wide-bandgap semiconductor with a band gap energy of 3.2 eV (anatase) and has been extensively studied. Nano TiO 2 (P25) has been widely used as a photocatalyst in the degradation of organic pollutants due to its high photocatalytic activity, non-toxicity, chemical stability and low cost. Of course, P25 is also difficult to recycle and reuse. The recombination of holes reduces its photocatalytic activity and other problems. People have done a lot of scientific research on how to improve the photocatalytic degradation performance of nanomaterials. At present, it is mainly carried out from the aspects of narrowing the band gap of nanomat...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01J27/055B82Y30/00B82Y40/00C01B3/04C01G23/00C02F1/30C25B1/04
CPCC25B1/04B82Y30/00B82Y40/00C01B3/042C01G23/006C02F1/30B01J27/053B01J27/055C01P2002/60C01P2004/64C02F2305/10C01B2203/1041C01B2203/1064C01B2203/107B01J35/39Y02E60/36
Inventor 胡陈果刘建林张翠玲王雪奚伊
Owner CHONGQING UNIV
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