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Visible light response type Zn2TiO4/g-C3N4 heterojunction material and application thereof

A g-c3n4, visible light technology, used in chemical/physical processes, ammonia preparation/separation, physical/chemical process catalysts, etc., can solve the problems of high energy consumption, inability to get rid of organic scavengers or sacrificial agents, and high production costs , to achieve the effect of simple operation, good photocatalytic nitrogen fixation and ammonia production, and promotion of separation

Active Publication Date: 2022-02-15
LIAONING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned photocatalytic nitrogen fixation still cannot get rid of organic capture agents or sacrificial agents (such as ethanol, etc.), and its production cost is high and energy consumption is relatively large.

Method used

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  • Visible light response type Zn2TiO4/g-C3N4 heterojunction material and application thereof
  • Visible light response type Zn2TiO4/g-C3N4 heterojunction material and application thereof
  • Visible light response type Zn2TiO4/g-C3N4 heterojunction material and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1 Visible light responsive Zn 2 TiO 4 / g -C 3 N 4 The preparation method of heterojunction material (1) is as follows:

[0021] 1. Preparation of pure g-C 3 N 4

[0022] Spread 1 g of melamine in a covered quartz crucible, raise the temperature to 600 °C at a rate of 5 °C / min, heat for 2 h under nitrogen protection, then cool to room temperature, grind it into powder, and collect it for later use.

[0023] 2. Preparation of pure Zn 2 TiO 4

[0024] Dissolve 0.874g of zinc nitrate hexahydrate in 10ml of absolute ethanol, then add 2ml of glacial acetic acid, stir at room temperature for 30min, add 1ml of tetra-n-butyl titanate dropwise to the resulting mixed solution, continue stirring for 30min, and dissolve the resulting solution After aging for 24 hours, dry at 80°C overnight to obtain an intermediate product; the obtained intermediate product is placed in a muffle furnace, heated to 600°C at a heating rate of 5°C / min in an air environment, calcined at...

Embodiment 2

[0031] Example 2 Zn 2 TiO 4 / g -C 3 N 4 Application of heterojunction materials in catalytic nitrogen fixation under visible light irradiation (1) The method is as follows:

[0032] Under normal temperature and pressure conditions, add 50mL methanol aqueous solution (0.001mol / L) in the container, then add the pure sample g-C prepared by 50mg embodiment 1 respectively 3 N 4 , pure Zn 2 TiO 4 Zn prepared with different mass ratios 2 TiO 4 / g -C 3 N 4 Heterojunction materials were subjected to ultrasound for 10 minutes to obtain a dispersion. Under the condition of visible light irradiation, nitrogen gas N was passed into the container at a rate of 10 mL / min. 2 After reacting for 180min, the supernatant was taken, and the ammonia production efficiency was determined by Nessler's reagent spectrophotometry. The result is as figure 2 and image 3 .

[0033] Depend on figure 2 Visible, Zn 2 TiO 4 / g -C 3 N 4 The ammonia yield of heterojunction materials is signi...

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Abstract

The invention discloses a visible light response type Zn2TiO4 / g-C3N4 heterojunction material and an application thereof. The preparation method comprises the following steps: adding zinc titanate Zn2TiO4 powder and melamine powder into deionized water, carrying out ultrasonic treatment for 1 hour, and then stirring for 12 hours to form a uniform dispersion liquid; drying the obtained dispersion liquid to obtain a precursor; and placing the obtained precursor in a muffle furnace for high-temperature calcination to obtain the Zn2TiO4 / g-C3N4 heterojunction material. According to the preparation method disclosed by the invention, g-C3N4 and Zn2TiO4 are compounded, so that the visible light response type Zn2TiO4 / g-C3N4 heterojunction material is successfully prepared, and the catalyst is applied to photocatalytic nitrogen fixation for ammonia production. Results show that the prepared Zn2TiO4 / g-C3N4 heterojunction material has relatively good photocatalytic nitrogen fixation and ammonia production performance, is simple to operate, has a popularization effect on photocatalytic green ammonia synthesis, and has the advantages of energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material synthesis, relates to visible light responsive catalysts, in particular to graphite carbon nitride (g-C 3 N 4 ) and zinc titanate (Zn 2 TiO 4 ) complex formed a visible light-responsive Zn 2 TiO 4 / g -C 3 N 4 Heterojunction materials and their application in nitrogen fixation. Background technique [0002] N 2 As a raw material for synthetic ammonia, it is abundant in the earth, but N 2 The molecule is a non-polar molecule, the nitrogen-nitrogen triple bond has a bond energy of 945kJ / mol, and the first bond dissociation energy is high, the nucleophilicity to the proton is weak, and it is extremely difficult to be reduced. At present, artificial nitrogen fixation mainly adopts the Haber method, and its reaction conditions are harsh, and it needs to be carried out under high temperature and pressure, which consumes a lot of energy and is accompanied by a large amount of CO. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01C1/02
CPCB01J27/24C01C1/0411B01J35/39Y02P20/52
Inventor 陶然谭青爽范晓星李永庆闫婷王彦欣
Owner LIAONING UNIVERSITY
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