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Cobaltosic oxide dodecahedron/carbon nitride nanosheet composite and application thereof in waste gas treatment

一种四氧化三钴、十二面体的技术，应用在化学/物理过程、金属/金属氧化物/金属氢氧化物催化剂、气体处理等方向，达到增强可见光响应范围、制备工艺简单、原料丰富易得的效果

Active Publication Date: 2019-08-30
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, exhaust gas also causes environmental pollution such as acid rain, acid fog and photochemical smog

Method used

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  • Cobaltosic oxide dodecahedron/carbon nitride nanosheet composite and application thereof in waste gas treatment
  • Cobaltosic oxide dodecahedron/carbon nitride nanosheet composite and application thereof in waste gas treatment
  • Cobaltosic oxide dodecahedron/carbon nitride nanosheet composite and application thereof in waste gas treatment

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[0033] The invention discloses a method for preparing a visible light-responsive cobalt tetroxide dodecahedron / carbon nitride nanosheet composite, which comprises the following steps:

[0034] (1) Take urea as the precursor and calcinate twice to obtain carbon nitride nanosheets;

[0035] (2) Disperse the carbon nitride nanosheets in methanol, sequentially add cobalt nitrate hexahydrate and 2-methylimidazole, and react to obtain a carbon nitride nanosheet composite;

[0036] (3) The carbon nitride nanosheet composite is calcined at low temperature in an air atmosphere to obtain the cobalt tetroxide dodecahedron / carbon nitride nanosheet composite.

Embodiment 1

[0038] The specific steps for the preparation of carbon nitride nanosheets are as follows: put 30 g of urea in a crucible with a lid, calcine in a muffle furnace air atmosphere, heat up to 550 ℃ at a heating rate of 2.5 ℃ / min, calcination time is 4 hours, annealing Afterwards, a block of carbon nitride is obtained; the block of carbon nitride is placed on the bottom of a square porcelain boat without a cover, and then calcined in the air atmosphere of a muffle furnace at a heating rate of 5°C / min to 500°C, The calcination time is 2h, and the present invention obtains pleated carbon nitride nanosheets after high temperature calcination twice; figure 1 TEM image of carbon nitride nanosheets.

Embodiment 2

[0040] The specific steps for preparing the carbon nitride nanosheet composite are as follows:

[0041] The carbon nitride nanosheet composite was synthesized by in-situ growth method. Disperse 0.06g of carbon nitride nanosheets uniformly in 15ml methanol for 30min ultrasonic treatment, then add 5ml of cobalt nitrate hexahydrate methanol solution (12mg / ml) into the suspension of carbon nitride nanosheets and continue ultrasonic treatment for 30min , To obtain a suspension of carbon nitride nanosheets combined with divalent cobalt ions. Afterwards, 2-methylimidazole methanol solution (5ml, 18mg / ml) was slowly poured into the above suspension, and the mixture was magnetically stirred at room temperature for 1 hour, and then left to stand for 24 hours. Finally, the purple product carbon nitride nanosheet composite obtained after centrifugation was washed three times with methanol and dried at 60°C overnight (24 hours), and collected for the preparation of cobalt tetroxide dodecahed...

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Abstract

The invention relates to a visible-light-responsive cobaltosic oxide dodecahedron / carbon nitride nanosheet composite and an application thereof in waste gas treatment. A preparation method of the composite comprises the following steps: with urea as a precursor, carrying out twice calcination to obtain carbon nitride nanosheets; dispersing the carbon nitride nanosheets into methanol, sequentiallyadding cobalt nitrate hexahydrate and 2-methylimidazole, and carrying out a reaction to obtain a carbon nitride nanosheet composite; and calcining the carbon nitride nanosheet composite in an air atmosphere at a low temperature to obtain the cobaltosic oxide dodecahedron / carbon nitride nanosheet composite. The in-situ growth synthesis method can ensure that cobaltosic oxide obtained by follow-up calcination uniformly coats the carbon nitride nanosheets, so that catalytic performance is improved; and low-temperature calcination ensures that the carbon nitride can still keep the wrinkle state and chemical structure of the carbon nitride in the calcination process.

Description

Technical field [0001] The invention belongs to the technical field of nanocomposites, and specifically relates to the preparation of a visible light-responsive cobalt tetroxide dodecahedron / carbon nitride nanosheet composite and its application in waste gas treatment. Background technique [0002] Due to the burning of chemical fuels, the production of chemical intermediates, and the uncontrolled emissions of automobile exhaust, global exhaust emissions are increasing year by year, accounting for about 90% of total man-made emissions, causing great harm to humans, animals and plants. In addition, exhaust gas also causes environmental pollution such as acid rain, acid fog, and photochemical smog. The problem of waste gas pollution needs to be solved urgently. Summary of the invention [0003] The purpose of the present invention is to provide a visible light-responsive cobalt tetroxide dodecahedron / carbon nitride nanosheet composite and its preparation method and its application ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01D53/86B01D53/38B01D53/62
CPCB01J27/24B01D53/8678B01D53/864B01J35/39B01J35/61B01D53/885B01D53/8628B01D2255/20746B01D2259/802B01D2258/06Y02A50/20B01J35/30B01J35/23B01J35/58B01D53/9413B01D2255/802B01D2255/91B01J23/75B01J37/009B01J37/04B01J37/06B01J37/088B01J37/343
Inventor 路建美陈冬赟
Owner SUZHOU UNIV
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