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Photocatalyst, preparation method and application thereof

A photocatalyst and fossil technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of limited carrier separation efficiency, save time and energy, improve separation efficiency, The possible effect of reducing

Active Publication Date: 2019-07-05
TCL CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, relying solely on the electron transport function of graphene to improve the separation efficiency of carriers is very limited.

Method used

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  • Photocatalyst, preparation method and application thereof
  • Photocatalyst, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add 1 mmol tetrabutyl titanate to 25 mL ethylene glycol and stir evenly, gradually add 5 mL 0.2 mol / L strontium nitrate solution, add 5 mL 2 mol / L sodium hydroxide solution, stir for 10 min, add 1 mL, 2 mg / mL graphene oxide solution, ultrasonic 30 min, to obtain graphene oxide doped strontium titanate-graphene oxide precursor, then add 5 mL, 0.01 mol / L cadmium acetate solution, add 5 mL of 0.01 mol / L sodium sulfide solution was stirred for 2 h, then transferred to the reactor, and reacted at 180 °C for 12 h to obtain SrTiO 3 - Graphene - CdS. The SrTiO obtained by this embodiment 3 - The degradation rate of graphene-CdS sample was 81% in 2 h, and the obtained SrTiO 3 - 701.9 μmol∙g of hydrogen produced by graphene-CdS sample after 4 hours of hydrogen production experiment -1 ∙ h -1 .

Embodiment 2

[0039] Add 2.5 mmol tetrabutyl titanate to 25 mL ethylene glycol and stir evenly, gradually add 5 mL, 0.5 mol / L strontium nitrate solution, add 5 mL, 5 mol / L sodium hydroxide solution, and stir for 10 min , add 5 mL, 2 mg / mL of graphene oxide solution, ultrasonic for 30 min to obtain the strontium titanate-graphene oxide precursor with graphene oxide doping amount, and then add 5 mL, 0.2 mol / L chlorine Cadmium chloride solution, add 5 mL of 0.2 mol / L thiourea solution, stir for 2 h, then transfer to a reaction kettle for 16 h at 180 °C to obtain SrTiO 3 - Graphene - CdS. The SrTiO obtained by this embodiment 3 -The degradation rate of graphene-CdS sample was 92% in 2 h, and the obtained SrTiO 3 - 492.6 μmol∙g of hydrogen produced by graphene-CdS sample after 4 hours of hydrogen production experiment -1 ∙ h -1 .

Embodiment 3

[0041] Add 5 mmol tetrabutyl titanate to 25 mL ethylene glycol and stir evenly, gradually add 5 mL, 0.5 mol / L strontium nitrate solution, add 5 mL, 5 mol / L sodium hydroxide solution, and stir for 10 min , adding 8 mL, 2 mg / mL graphene oxide solution, ultrasonication for 30 min, to obtain strontium titanate-graphene oxide precursors with different amounts of graphene oxide doping, and then adding 5 mL 1 mol / L nitric acid Cadmium solution, add 5 mL of 1 mol / L L-cysteine ​​solution, stir for 2 h, then transfer to a reaction kettle for 36 h at 180 °C to obtain SrTiO 3 - Graphene - CdS. SrTiO obtained by Example 3 3 - The degradation rate of graphene-CdS sample was 76% in 2 h, and the obtained SrTiO 3 - 983.1 μmol∙g of hydrogen produced by graphene-CdS sample after 4 hours of hydrogen production experiment -1 ∙ h -1 .

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Abstract

The invention discloses a photocatalyst, a preparation method and application thereof. Specifically, the method includes the steps of: mixing a graphene oxide solution with a strontium titanate precursor to obtain a mixed solution, adding a Cd precursor into the mixed solution and performing heating, and gradually adding an S precursor in the heating process to obtain a ternary composite photocatalyst of strontium titanate, graphene and CdS. By using the ternary composite material, the invention realizes the coexistence of graphene's electron transport ability and the heterostructure of CdS and strontium titanate in a same material, compared with a binary structure, the photocatalytic performance of the ternary composite photocatalyst is greatly improved. The preparation of graphene in theinvention does not use any reductant, and brown graphene oxide is reduced into black reduced graphene directly by means of hydrothermal conditions. The invention adopts one-pot method to prepare theternary structure, the precursors of strontium titanate and CdS and graphene oxide are mixed evenly and then the mixture is put into a reaction kettle for one-step reaction to complete preparation, thus saving time and energy.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a photocatalyst and its preparation method and application. Background technique [0002] With the continuous development of economy and society, problems such as environmental pollution and energy shortage are becoming more and more serious. As a green potential technology, photocatalysis plays a vital role in environmental protection and solar energy conversion. [0003] The photocatalytic activity of semiconductors is very strong, which depends on the transport and separation efficiency of electrons and holes generated in photocatalysts. However, free carriers (free electrons and holes) are easily trapped or scattered by various random defects, leading to an increased possibility of electron and hole recombination. Therefore, how to increase the separation efficiency of electrons and holes has become the focus of improving the performance of photocatalysts. [0004] Stron...

Claims

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Application Information

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IPC IPC(8): B01J27/138B01J37/04C01B3/04C02F1/30C02F101/30
CPCB01J27/138B01J37/04C01B3/042C02F1/30C01B2203/0277C01B2203/1041C02F2305/10C02F2101/308B01J35/39Y02E60/36
Inventor 霍蕊
Owner TCL CORPORATION
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