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Carbon nitride/titanium dioxide nanosheet array heterojunction photocatalyst and preparation method

A nanosheet array and titanium dioxide technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of easy recombination of photogenerated electrons/holes, uneven recombination of composite materials, and solar energy utilization. Low-level problems, to achieve the effect of improving photocatalytic hydrogen production activity, good commercial application prospects, and improving photocatalytic activity

Inactive Publication Date: 2017-07-14
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a carbon nitride / titanium dioxide nanosheet array heterojunction photocatalyst and its preparation method, which solves the problem of existing g-C 3 N 4 / TiO 2 Problems such as uneven recombination of composite materials, low exposure rate of active surface, easy recombination of photogenerated electrons / holes, and low utilization rate of solar energy

Method used

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  • Carbon nitride/titanium dioxide nanosheet array heterojunction photocatalyst and preparation method
  • Carbon nitride/titanium dioxide nanosheet array heterojunction photocatalyst and preparation method
  • Carbon nitride/titanium dioxide nanosheet array heterojunction photocatalyst and preparation method

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Embodiment 1

[0025] (1) g-C 3 N 4 preparation of

[0026] Accurately weigh 10g of urea and transfer it into an alumina crucible, put the crucible into a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min, and keep it for 3h to obtain a light yellow powder g-C 3 N 4 The crude product was ground, washed successively with deionized water, 0.4% HCl solution, 1% NaOH solution, and finally washed with deionized water until neutral, and dried at 60°C for 12 hours to obtain pure yellow powder g-C 3 N 4 . Then, accurately measure 50mL of isopropanol and transfer it into a beaker, add 150mg of the obtained pure g-C 3 N 4 , ultrasonic dispersion for 30min to obtain pure g-C 3 N 4 exfoliation dispersion. (2)g-C 3 N 4 / TiO 2 Precursor preparation

[0027] Replace the above g-C 3 N 4 Transfer the exfoliation dispersion liquid into a hydrothermal kettle, add 21mL isopropanol, then add 0.09mL diethylenetriamine and 4.5mL isopropyl titanate in sequence, mix the solution ev...

Embodiment 2

[0033] (1) g-C 3 N 4 preparation of

[0034] Accurately weigh 10g of urea and transfer it into an alumina crucible, put the crucible into a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min, and keep it for 3h to obtain a light yellow powder g-C 3 N 4 The crude product was ground, washed successively with deionized water, 0.4% HCl solution, 1% NaOH solution, and finally washed with deionized water until neutral, and dried at 60°C for 12 hours to obtain pure yellow powder g-C 3 N 4 . Then, accurately measure 50mL of isopropanol and transfer it into a beaker, add 50mg of the obtained pure g-C 3 N 4 , ultrasonic dispersion for 30min to obtain pure g-C 3 N 4 exfoliation dispersion. (3) g-C 3 N 4 / TiO 2 Precursor preparation

[0035] Replace the above g-C 3 N 4 Transfer the exfoliation dispersion liquid into a hydrothermal kettle, add 21mL isopropanol, then add 0.09mL diethylenetriamine and 4.5mL isopropyl titanate in sequence, mix the solution ev...

Embodiment 3

[0039] (1) g-C 3 N 4 preparation of

[0040] Accurately weigh 10g of urea and transfer it into an alumina crucible, put the crucible into a muffle furnace, raise the temperature to 550°C at a rate of 10°C / min, and keep it for 3h to obtain a light yellow powder g-C 3 N 4 The crude product was ground, washed successively with deionized water, 0.4% HCl solution, 1% NaOH solution, and finally washed with deionized water until neutral, and dried at 60°C for 12 hours to obtain pure yellow powder g-C 3 N 4 . Then, accurately measure 50mL of isopropanol into a beaker, add 100mg of the obtained pure g-C 3 N 4 , ultrasonic dispersion for 30min to obtain pure g-C 3 N 4 exfoliation dispersion. (2)g-C 3 N 4 / TiO 2 Precursor preparation

[0041]Replace the above g-C 3 N 4 Transfer the exfoliation dispersion liquid into a hydrothermal kettle, add 21mL isopropanol, then add 0.09mL diethylenetriamine and 4.5mL isopropyl titanate in sequence, mix the solution evenly, react at 20...

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Abstract

The invention relates to a carbon nitride / titanium dioxide nanosheet array heterojunction photocatalyst and a preparation method, belonging to the technical field of photocatalysis of nanometer materials. The catalyst is prepared through the following steps: with g-C3N4 as a carrier, titanium isopropoxide as a titanium source, diethylenetriamine as a morphology controlling agent and isopropanol as a solvent, performing a solvothermal method so as to prepare a g-C3N4 / TiO2 precursor, and carrying out calcination treatment so as to obtain a g-C3N4 / TiO2 nanosheet array heterojunction composite photocatalyst for the first time. The heterojunction composite photocatalyst shows pure and significantly-improved photocatalytic hydrogen production activity to g-C3N4 and anatase TiO2 nanosheet mesoporous spheres in a photocatalytic hydrogen production reaction. The preparation method has the advantages of simple and convenient operation, easy control, greenness, environmental protection and good application prospects. The series of catalysts has multilevel structure; and a g-C3N4 / TiO2 nanosheet array heterojunction structure is formed through vertical and staggered growth of anatase TiO2 nanosheets with regular shape and uniform size on the surface of g-C3N4. The catalyst has excellent photocatalytic hydrogen production activity, good stability, high repeatability and facilitation large-scale production.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis of nanomaterials, and in particular provides a carbon nitride / titanium dioxide (g-C 3 N 4 / TiO 2 ) nanosheet array heterojunction photocatalyst and preparation method thereof. Background technique [0002] With the aggravation of global energy shortage and environmental pollution, the use of photocatalytic hydrogen production technology to convert solar energy into chemical energy has attracted widespread attention. Since the first discovery of TiO by Fujishima and Honda 2 Electrode can photocatalytically split water to produce H 2 Since (Nature,1972,23,37–38), TiO 2 Because of its cheap, non-toxic, and good chemical stability, it is considered to be one of the photocatalysts with the most potential for practical application. TiO 2 There are three main crystal forms: anatase, rutile, and brookite. Anatase TiO 2 Because of the strong redox ability of photogenerated carriers and high...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C01B3/04B01J37/08C02F101/30
CPCC01B3/042C02F1/30B01J27/24B01J37/08C01B2203/0277C01B2203/1041C02F2305/10C02F2101/30B01J35/39Y02W10/37Y02E60/36
Inventor 张慧吴宁安
Owner BEIJING UNIV OF CHEM TECH
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