MgAl LDO/nitrogen vacancy carbon nitride-based photocatalyst as well as preparation method and application thereof

A carbon nitride-based, photocatalyst technology, applied in the field of nanomaterials and photocatalysis, can solve the problems of low conversion rate and achieve the effects of short cycle, improved activity and low cost

Active Publication Date: 2021-05-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at g-C 3 N 4 Photocatalytic reduction of CO 2 To solve the problem of low conversion rate, a method for preparing magnesium-aluminum bimetallic layered oxide / nitrogen vacancy carbon nitride nanosheet photocatalytic material is provided

Method used

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  • MgAl LDO/nitrogen vacancy carbon nitride-based photocatalyst as well as preparation method and application thereof
  • MgAl LDO/nitrogen vacancy carbon nitride-based photocatalyst as well as preparation method and application thereof
  • MgAl LDO/nitrogen vacancy carbon nitride-based photocatalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of nitrogen vacancy g-C 3 N 4 Nanosheets, spare:

[0039] Weigh 1g of DCDA and 5g of NH 4 Cl, DCDA and NH to be weighed 4 Cl was added to 50mL water in turn and stirred until it was transparent and colorless, then the resulting clear solution was frozen at -4°C for 12h, and then the frozen solution was quickly transferred to a vacuum freeze dryer to freeze-dry to obtain white DCDA and NH 4 Cl mixed crystals, the mixed crystals were placed in a semi-closed crucible, and then the crucible was transferred to an automatic temperature-controlled heating tube furnace in N 2 Calcined at 550°C for 4 hours under air protection, cooled to room temperature naturally, took it out, and ground it into powder with a mortar to obtain nitrogen vacancy g-C 3 N 4 Nanosheets.

[0040] (2) Prepare magnesium-aluminum layered double hydroxide (MgAl LDH) nanosheet material, for subsequent use:

[0041] Weigh 5.769g of Mg(NO 3 ) 2 ·6H 2 O and 2.813g of Al(NO 3 ) 3 9H...

Embodiment 2

[0045] The step (1) of this example is identical with example 1 step (2);

[0046] (2) Preparation of magnesium aluminum double metal oxide (MgAl LDO) nanosheet material: Take 20ml of MgAl LDH suspension, stir and evaporate to dryness at 80°C, then grind the evaporated product into powder in a mortar, and place in Then transfer the alumina porcelain boat to an automatic temperature-controlled tube furnace for calcination at 400 °C for 3 hours, after cooling to room temperature naturally, take it out, and grind it into powder with a mortar to obtain MgAl LDO nanosheet material.

Embodiment 3

[0048] Step (1) and step (2) of this example are identical with step (1) and step (2) of example 1;

[0049] (3) Preparation of MgAl LDH / N v -CN nanosheet composite photocatalytic material: the g-C of nitrogen vacancies obtained in step (1) 3 N 4 Disperse the nanosheets in 10ml of deionized water, stir and ultrasonically disperse to obtain a uniform and stable yellow suspension, add the MgAl LDH solution obtained in step (2) dropwise while stirring, and dissolve the mixed solution at 80°C after the dropwise addition Stir and evaporate to dryness.

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Abstract

The invention belongs to the field of nano materials, and relates to an MgAl LDO / nitrogen vacancy carbon nitride-based photocatalyst as well as a preparation method and application thereof. According to the preparation method, a carbon nitride (g-C3N4) nanosheet rich in nitrogen vacancies is prepared, magnesium-aluminum bimetallic layered hydroxide (MgAl LDH) is deposited on the surface of the carbon nitride (g-C3N4) nanosheet in situ, and the magnesium-aluminum bimetallic layered oxide (MgAl LDH) / nitrogen vacancy carbon nitride composite photocatalytic CO2 reduction material which is low in cost, easy to obtain, stable in structure and high in catalytic activity is prepared through continuous calcination. The surface of MgAlLDO has abundant Lewis base / acid sites, O<2->, Mg<2+>-O<2-> and OH groups are used as Lewis base sites to improve the adsorption activation capacity of CO2, Al<3+> and Al<3+>-O<2-> are used as Lewis acid sites to improve the adsorption / dissociation of H2O, the oxidation semi-reaction of H2O is accelerated, more protons are provided, and the CO2 reduction activity is further improved. Meanwhile, surface nitrogen vacancies are beneficial to separation of photo-induced electrons and holes, and the Lewis acid / alkali and the nitrogen vacancies cooperate to enable the composite photocatalytic material to have excellent CO2 photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterials and photocatalysis, and relates to a magnesium-aluminum double-metal layered oxide / nitrogen vacancy carbon nitride nanosheet and a preparation method and application thereof. [0002] technical background [0003] In recent years, photocatalytic technology has attracted extensive attention from researchers because of its low operating cost, mild reaction conditions, and low secondary pollution. Photocatalytic reduction of CO 2 Technology could harness abundant solar energy to reduce greenhouse gas CO 2 Convert to CO, CH 4 Such valuable chemical raw materials and energy fuels are an ideal method to solve the energy crisis and alleviate the greenhouse effect. Compared with other conversions, photocatalytic reduction of CO 2 It has the advantages of cheap and abundant raw materials, high added value of carbon-containing products, high product energy density, and low operating cost, so it has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C01B32/40
CPCB01J27/24B01J35/004C01B32/40
Inventor 姜德立宋奇李娣周以萌
Owner JIANGSU UNIV
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