NiM-LDH/g-C3N4 composite photocatalytic material and preparation method thereof

A composite photocatalysis, g-c3n4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen/syngas production, etc. Low cost, good repeatability, enhanced separation efficiency and light absorption performance

Active Publication Date: 2020-05-19
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But the existing NiM-LDH / g-C 3 N 4 Composite photocatalytic materials have thick sheets and visible light catalytic hydrogen production performance is still low, which is still far from practical application

Method used

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  • NiM-LDH/g-C3N4 composite photocatalytic material and preparation method thereof
  • NiM-LDH/g-C3N4 composite photocatalytic material and preparation method thereof
  • NiM-LDH/g-C3N4 composite photocatalytic material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0026] High specific surface porous g-C 3 N 4 preparation of

[0027] Put 20 g of urea into a 50 mL crucible, cover it, put it into a muffle furnace, raise the temperature to 550 °C at a heating rate of 2 °C / min, keep the temperature for 4 h, and then cool it down to room temperature naturally. Take it out and grind it finely to get g-C with high specific surface porosity 3 N 4 Beige powder.

Embodiment 2

[0029] NiFe-LDH / g-C 3 N 4 -2.5 Preparation of two-dimensional ultrathin composite catalytic materials

[0030] Take by weighing 0.488g g-C prepared through embodiment 1 3 N 4 Put the powder in a polytetrafluoroethylene tank, add 25mL of n-butanol and 25mL of purified water, then add 100mg of urea, 34mg of nickel nitrate, 7.5mg of ferric nitrate and 200mg of sodium citrate, ultrasonically disperse for 20min, then cover and seal, and place at 120°C Heat treatment in a hydrothermal oven for 12 hours, filter after natural cooling, wash 3-5 times with pure water, and dry at 80°C for 10 hours to obtain NiFe-LDH / g-C with a NiFe-LDH content of 2.5wt%. 3 N 4 Two-dimensional ultrathin composite photocatalytic material, denoted as NiFe-LDH / g-C 3 N 4 -2.5.

Embodiment 3

[0032] NiFe-LDH / g-C 3 N 4 -5.0 Preparation of two-dimensional ultra-thin composite catalytic materials

[0033] Take by weighing 0.475g g-C prepared through embodiment 1 3 N 4 Put the powder in a polytetrafluoroethylene tank, add 25mL n-butanol and 25mL purified water, then add 200mg urea, 67mg nickel nitrate, 15mg ferric nitrate and 400mg sodium citrate, ultrasonically disperse for 20min, then cover and seal, place in 120℃ water Heat treatment in a hot oven for 12 hours, filter after natural cooling, wash 3-5 times with pure water, and dry at 80°C for 10 hours to obtain NiFe-LDH / g-C with a NiFe-LDH content of 5.0wt%. 3 N 4 Two-dimensional ultrathin composite photocatalytic material, denoted as NiFe-LDH / g-C 3 N 4 -5.0.

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Abstract

The invention discloses a NiM-LDH/g-C3N4 composite photocatalytic material and a preparation method thereof. An alcohol-water mixed solvent is utilized, and g-C3N4, nickel salt, transition metal salt,a surfactant and a precipitator are added in the solvothermal treatment process, so that g-C3N4 can be stripped to obtain ultrathin porous g-C3N4, and meanwhile, ultrathin two-dimensional NiM hydrated hydroxide can be generated on the surface of g-C3N4 in situ. The preparation method disclosed by the invention is simple and feasible; good repeatability, safety and reliability; the NiM-LDH/g-C3N4composite photocatalytic material is an ultrathin two-dimensional composite photocatalytic material, which is simple in preparation method, relatively low in cost and high in specific surface area, greatly enhances the photo-induced electron hole separation efficiency and light absorption performance, has relatively high catalytic activity and stability for hydrogen production through visible light catalytic water splitting, and can realize efficient hydrogen production through visible light catalysis.

Description

technical field [0001] The invention belongs to the technical field of composite photocatalytic materials, in particular to a NiM-LDH / g-C 3 N 4 Composite photocatalytic material and preparation method thereof. Background technique [0002] Hydrogen energy has a high combustion calorific value, and the combustion process is clean and pollution-free. It is the most promising secondary energy in the future. In recent years, fuel cell vehicles and distributed power stations based on hydrogen energy have flourished. Photolysis of water to produce hydrogen with the help of semiconductor photocatalysts converts solar energy into hydrogen energy, which is the ultimate way to achieve low-carbon, clean and sustainable energy in the entire process. [0003] The design and development of photocatalytic materials is the key to realizing efficient hydrogen production by photolysis of water. The semiconductors used to catalyze photolysis of water to produce hydrogen mainly include TiO ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B3/04
CPCB01J35/004B01J27/24C01B3/042C01B2203/0277C01B2203/1058Y02E60/36
Inventor 许学俊郭开锦贺啟志胡晓洪陈东初
Owner FOSHAN UNIVERSITY
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