3D/2D ni-co double metal oxide/g-c 3 no 4 Nanocomposite materials and their preparation methods and applications

A g-c3n4, nanosheet technology, applied in chemical instruments and methods, separation methods, chemical/physical processes, etc., can solve the problems of limiting the photocatalytic performance of pure catalysts, narrow visible light response range, low specific surface area, etc., to achieve effective The effect of photocatalytic degradation, promotion of photocatalytic activity, and simple preparation process

Active Publication Date: 2022-06-07
SUZHOU UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

Among the current various photocatalysts, g-C 3 N 4 Due to its unique planar structure, suitable bandgap (2.7eV), and metal-free catalysts, it has been widely studied; however, due to its low specific surface area, poor electrical conductivity, narrow response range to visible light, and extremely fast photogenerated carrier recombination greatly limit its Photocatalytic performance as a pure catalyst

Method used

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  • 3D/2D ni-co double metal oxide/g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • 3D/2D ni-co double metal oxide/g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications
  • 3D/2D ni-co double metal oxide/g-c <sub>3</sub> no <sub>4</sub> Nanocomposite materials and their preparation methods and applications

Examples

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preparation example Construction

[0026] 2D g-C 3 N 4 Preparation of nanosheets

[0027] First, add a certain amount of urea into the aluminum crucible with lid, put it in a muffle furnace, cover the lid, and carry out the first calcination; then collect the product, adjust the calcination temperature and heating rate for the second calcination, and obtain a light yellow product for g-C 3 N 4 Nanosheets.

[0028] 3D / 2D Ni-Co Bimetal Oxide / g-C 3 N 4 Preparation of nanocomposites

[0029] First, nickel nitrate hexahydrate (Ni(NO 3 ) 3 ·6H 2 O), sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O) and g-C 3 N 4 The nanosheets were evenly mixed in water to obtain solution A, and the cobalt potassium cyanide (K 3 [Co(CN) 6 ]) Dissolved in water to obtain a colorless and transparent solution B, mixed solution A and solution B, centrifuged and washed after aging to obtain light blue Ni-Co Prussian blue / g-C 3 N 4 precursor, which was then transferred to a muffle furnace for calcination to obtain Ni-Co bimetal...

Embodiment 1

[0038] 2D g-C 3 N 4 Preparation of nanosheets: First, add 10 g of urea to an aluminum crucible with a lid, put it in a muffle furnace, cover with the lid, and calcine at 550 °C for 4 h at a heating rate of 2.5 °C·min -1 (room temperature to 550 °C), after the muffle furnace was cooled to room temperature, a yellow solid was obtained; then the obtained yellow solid was spread in a rectangular crucible, and then calcined at 500 °C for 2 h at a heating rate of 5 °C min -1 (room temperature to 500°C), the light yellow product, namely two-dimensional g-C, was collected. 3 N 4 Nanosheets.

[0039] In order to observe the morphology of the material, the products prepared in this example were characterized by scanning electron microscopy and transmission electron microscopy. figure 1 is the two-dimensional g-C prepared in this example 3 N 4 SEM images and TEM images of nanosheets, (a) and (b) are g-C prepared in this example, respectively 3 N 4 nanosheets, called CNs.

Embodiment 2

[0041] Ni-Co bimetal oxide / g-C 3 N 4 Preparation of nanocomposites: First, 100 mg of nickel nitrate hexahydrate (Ni(NO 3 ) 3 ·6H 2 O), 162.5 mg sodium citrate (Na 3 C 6 H 5 O 7 ·2H 2 O) and 150 mg g-C 3 N 4 The nanosheets were dispersed in 20 ml of deionized water, and the solution A was formed by conventional stirring; 200 mg of potassium cobalt cyanide (K 3 [Co(CN) 6 ]) in 20 ml of deionized water to form solution B; the solution A and B were mixed and then left to stand for aging at room temperature for 24 h. The obtained product was washed by conventional centrifugation with water and ethanol, and the precipitate was dried in an oven at 60 °C for 24 h. , the obtained light blue sample is Ni 3 [Co(CN) 6 ] / g-C 3 N 4 nanocomposite; then the resulting Ni 3 [Co(CN) 6 ] / g-C 3 N 4 The nanocomposites were calcined at 350 °C for 2 h in a muffle furnace with a heating rate of 2 °C min -1 (room temperature to 350°C), after the muffle furnace was naturally cooled t...

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Abstract

The invention discloses a three-dimensional / two-dimensional Ni-Co double metal oxide / g-C 3 N 4 Nanocomposites and their preparation methods and applications. Using urea as raw material, calcined to make g‑C 3 N 4 nanosheets; as nickel salts, cobalt salts, and g‑C 3 N 4 Using nanosheets as raw materials, three-dimensional / two-dimensional Ni‑Co double metal oxides / g‑C were obtained by low-temperature calcination 3 N 4 Nanocomposites; under light, pass exhaust gas through 3D / 2D Ni‑Co double metal oxide / g‑C 3 N 4 Nanocomposite material for photocatalytic treatment of exhaust gas. The present invention NiCoO x / g‑C 3 N 4 The catalytic efficiency of exhaust gas is significantly better than that of NiCoO x (20%), and g‑C 3 N 4 (37%); and NICO / CN‑100 can achieve the highest degradation effect of 59.1%; indicating that NiCoO x / g‑C 3 N 4 The complex has good catalytic degradation activity to nitric oxide.

Description

technical field [0001] The invention belongs to the technical field of inorganic functional materials, and in particular relates to two-dimensional g-C 3 N 4 A preparation method of nanosheet-wrapped three-dimensional hollow Ni-Co double metal oxide composite catalyst and its application in waste gas treatment. Background technique [0002] With the rapid development of industries around the world, air pollution has become one of the most serious problems today. Exhaust gas will cause photochemical pollution, acid rain, smog, etc., which will cause great harm to human body, land and water. Therefore, finding a cheap, efficient and energy-saving method to degrade waste gas has become a hot issue in environmental research. At present, semiconductor photocatalysis technology has the advantages of non-toxicity, high degradation efficiency, and strong redox ability, and is considered to be one of the most economical and effective methods to deal with exhaust gas pollution. Am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24B01J35/10B01D53/86B01D53/56
CPCB01J35/004B01J27/24B01J35/1004B01D53/8628Y02A50/20
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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