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Composite photocatalyst and preparation method and application thereof

A catalyst and composite light technology, applied in the field of materials, can solve the problems of weak photoetching resistance, uneven distribution, and unsatisfactory photocatalytic performance

Inactive Publication Date: 2018-09-14
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the further application of graphitic carbon nitride is limited by its shortcomings such as fast photogenerated carrier recombination rate and weak photoetching resistance.
In the prior art, titanium dioxide and graphite phase carbon nitride are composited, and the distribution of titanium dioxide on the surface of graphite phase carbon nitride in the obtained composite photocatalyst is not uniform, resulting in unsatisfactory photocatalytic performance

Method used

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  • Composite photocatalyst and preparation method and application thereof
  • Composite photocatalyst and preparation method and application thereof
  • Composite photocatalyst and preparation method and application thereof

Examples

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preparation example Construction

[0025] The invention provides a preparation method of a composite photocatalyst, comprising the following steps: carbon nitride of graphite phase, stripping Ti 3 C 2 The suspension and water are sequentially mixed, freeze-dried and calcined to obtain the composite photocatalyst. In the present invention, the graphite phase carbon nitride, exfoliated Ti 3 C 2 The usage ratio of water and water is preferably 0.2g:0.0125-0.2g:10-40ml, more preferably 0.2:0.02-0.15:15-35ml, most preferably 0.2:0.05:30ml. In the present invention, the stripped Ti 3 C 2 The concentration and dosage of the suspension are not particularly limited, as long as the stripped Ti 3 C 2 The mass ratio of carbon nitride to graphite phase is 0.0125-0.2:0.2.

[0026] The present invention is to described graphite phase carbon nitride, exfoliated Ti 3 C 2 The method of mixing the suspension and water is not particularly limited, and a mixing method well known to those skilled in the art can be used. In...

Embodiment 1

[0045] 30g of urea was subjected to thermal polycondensation reaction at 500°C for 2h to obtain graphite phase carbon nitride.

[0046] Dissolve 1.5g LiF in 15ml HCl solution with a concentration of 6mol / L, add 1.5g Ti 3 AlC 2 powder, and stirred in a water bath at 60°C for 24 hours to obtain an etching product;

[0047] The obtained etching product was repeatedly centrifuged and cleaned until the supernatant was neutral, and the Ti 3 C 2 Stripped into a single layer, and finally centrifuged at 3500rpm at low speed for 1h to separate the stripped and non-striped samples to obtain the stripped Ti 3 C 2 suspension.

[0048] Mix 0.2 g of graphitic carbon nitride and 20 ml of exfoliated Ti at a concentration of 2.5 mg / ml 3 C 2 The suspension was mixed, and 30ml of deionized water was added to keep the total volume of the system at 50ml; the mixed solution was sonicated at 80W for 30min, stirred for 30min, and freeze-dried to obtain a freeze-dried product; the freeze-dried p...

Embodiment 2

[0056] 0.2 g of graphitic carbon nitride and 40 ml of exfoliated Ti at a concentration of 2.5 mg / ml 3 C 2 The suspension was mixed, and 10ml of deionized water was added to keep the total volume of the system at 50ml; the mixed solution was sonicated at 80W for 30min, then stirred for 30min, and freeze-dried to obtain a freeze-dried product; the freeze-dried product was roasted at 350°C for 1 hour to obtain The composite photocatalyst; the composite photocatalyst includes the following components in weight percentage: titanium dioxide nanoparticles 30.41%, stripping Ti 3 C 2 9.01%, graphite phase carbon nitride 60.58%;

[0057] The same test method as in Example 1 was used to measure the photocatalytic water splitting hydrogen production performance of the composite photocatalyst. The test results were: the measured hydrogen production was 1.36 mmol / g, and the pure carbon nitride was 2.68 mmol / g.

[0058] The graphitic phase of carbon nitride and exfoliated Ti 3 C 2 The p...

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Abstract

The invention provides a preparation method of a composite photocatalyst and belongs to the technical field of material. The preparation method comprises the steps of mixing graphite-phase carbon nitride, stripped Ti3C2 suspension and water, lyophilizing the mixture, and calcining to obtain the composite photocatalyst, wherein calcining temperature is 300-400 DEG C. Stripped Ti3C2 is used as a precursor for titanium dioxide nanoparticles such that titanium dioxide nanoparticles from the stripped Ti3C2 by oxidation are distributed more evenly on the surface of the graphite-phase carbon nitride;therefore, the composite photocatalyst has heterogenous structure and improved visible light catalysis.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a composite photocatalyst and its preparation method and application. Background technique [0002] In order to solve a series of problems such as environmental pollution and resource shortage, people focus on the development and utilization of abundant and recyclable solar energy resources. Semiconductor photocatalysts are just such materials with great application prospects. At present, good research results have been achieved in sewage treatment, air purification, antibacterial, nitrogen fixation, and solar fuel synthesis. [0003] As the earliest and most researched semiconductor photocatalyst, titanium dioxide has been studied by Fujishima et al. in 1972 to produce hydrogen by photolysis of water. However, limited by its large forbidden band width, titanium dioxide cannot respond to visible light, which accounts for 45% of sunlight. Graphite carbon nitride is an amorphou...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/02C01B3/04
CPCC01B3/042B01J27/24B01J35/399B01J35/393B01J35/50B01J35/23B01J35/39Y02E60/36
Inventor 张新宇张梦原秦家千刘日平
Owner YANSHAN UNIV
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