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VO2/g-C3N4 composite photocatalyst as well as preparation method and application thereof

A g-c3n4, VO2 technology, applied in physical/chemical process catalysts, chemical instruments and methods, oxidation preparation of carbonyl compounds, etc., can solve problems such as unsatisfactory photocatalytic performance, improve conversion rate and selectivity, and simplify the process. Environmental protection and strong catalytic activity

Active Publication Date: 2021-04-16
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Photocatalytic technology has broad application prospects in environmental purification and energy conversion, g-C 3 N 4 As a new photocatalytic material, it has the advantages of good visible light responsivity, good chemical stability, simple and cheap preparation process, etc., and has broad application prospects, but pure g-C 3 N 4 Due to the easy recombination of photogenerated electrons and holes, its photocatalytic performance is not ideal

Method used

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  • VO2/g-C3N4 composite photocatalyst as well as preparation method and application thereof
  • VO2/g-C3N4 composite photocatalyst as well as preparation method and application thereof
  • VO2/g-C3N4 composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0029] The present invention provides VO 2 / g -C 3 N 4 The preparation method of composite catalyst comprises the following steps: first, prepare g-C 3 N 4 : Put the urea in a crucible wrapped in aluminum foil and use a muffle furnace to heat up to 500-600°C for 1.5-2.5 hours, then put it in a crucible with a cover, raise the temperature to 500-600°C in the muffle furnace, and refire. Keep warm for 1.5-2.5h to get g-C 3 N 4 .

[0030] Then, VO was prepared by ultrasound-assisted method under different pH environments. 2 VO with different mass proportions 2 / g -C 3 N 4 Composite photocatalyst:

[0031] Pour an appropriate amount of ultrapure water or ethanol aqueous solution into a beaker, and weigh g-C according to the mass ratio 3 N 4 Add it into a beaker and ultrasonically stir for 1h, take an appropriate amount of ultrapure water or ethanol aqueous solution and pour it into another beaker, and weigh VO according to the mass ratio 2 In a beaker, stir magneticall...

Embodiment 1

[0036] (1) g-C 3 N 4 Preparation of:

[0037] Take 5g of urea and place it in a crucible wrapped in aluminum foil, place the crucible in a muffle furnace, raise the temperature to 550°C at a rate of 10°C per minute, and keep it warm for 2h. Reburn the preliminarily fired urea, put it in a covered crucible, raise the temperature to 550°C at a rate of 5°C per minute, and keep it warm for 2 hours to obtain g-C 3 N 4 .

[0038] (2) In pH=7 solution, W7-VO 2 / g -C 3 N 4 Preparation of composite photocatalyst:

[0039] Take 20mL ultrapure water in a beaker, weigh 0.9g g-C 3 N 4 Add it into a beaker and ultrasonically stir for 1h, take 20mL of ultrapure water in another beaker, and weigh 0.1gVO 2 In a beaker and stirred until completely dissolved, the dissolved VO 2 Add the solution to the above g-C 3 N 4 In the solution, sonicate for 1h, then stir and evaporate at 80°C until the solution becomes a paste, put the beaker in an oven and dry at 80°C for 12h, and grind it wi...

Embodiment 2

[0045] (1) g-C 3 N 4 Preparation of:

[0046] Take 5g of urea and put it in a crucible wrapped in aluminum foil, place the crucible in a muffle furnace, raise the temperature by 10°C per minute to 550°C, and keep it warm for 2h. Reburn the preliminarily fired urea, put it in a covered crucible, raise the temperature to 550°C at 5°C per minute, and keep it warm for 2 hours to obtain g-C 3 N 4 .

[0047] (2) In pH=1 solution, W7-VO 2 / g -C 3 N 4 Preparation of composite photocatalyst:

[0048] Take 20mL ultrapure water in a beaker, weigh 0.9g g-C 3 N 4 Add it into a beaker and ultrasonically stir for 1h, take 20mL of ultrapure water in another beaker, and weigh 0.1gVO 2 In a beaker and stirred until completely dissolved, the dissolved VO 2 Add the solution to the above g-C 3 N 4 Add oxalic acid to the solution to adjust the pH of the solution to 1, sonicate for 1h, then stir and evaporate at 80°C until the solution becomes a paste, put the beaker in an oven and dry ...

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Abstract

The invention provides a VO2 / g-C3N4 composite photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving g-C3N4 into a solvent to obtain a g-C3N4 solution, dissolving VO2 into the solvent to obtain a VO2 solution, adding the VO2 solution into the g-C3N4 solution, ultrasonically stirring, then heating, stirring and evaporating until the solution is pasty, drying and cooling and grinding to obtain the VO2 / g-C3N4 composite photocatalyst. The photocatalyst disclosed by the invention is simple in synthesis process and excellent in reusability, and has excellent selectivity on aromatic alcohol. VO2 / g-C3N4 is used as a photocatalyst for the first time, an LED lamp is used as a light source, oxygen is used as an oxidizing agent, 1-phenylethanol is subjected to selective photocatalytic oxidation in an acetonitrile solution to form acetophenone, and the prepared photocatalyst has high oxidation efficiency and excellent selectivity for selective oxidation of 1-phenylethanol.

Description

technical field [0001] The invention relates to the technical field of preparation of composite photocatalyst and its catalytic reaction, in particular, to a VO 2 / g -C 3 N 4 Composite photocatalyst and its preparation method and application Background technique [0002] The selective oxidation of alcohols to the corresponding aldehydes and ketones is of great importance in organic synthesis and has a wide range of applications in the chemical and pharmaceutical industries. Traditional industrial methods have obvious disadvantages, such as serious pollution, low selectivity, and difficulty in recycling. Therefore, it is necessary to explore an efficient and environmentally friendly catalytic oxidation method. Photocatalytic technology has broad application prospects in environmental purification and energy conversion, g-C 3 N 4 As a new photocatalytic material, it has the advantages of good visible light responsivity, good chemical stability, simple and cheap preparati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C07C45/29C07C47/54C07C47/232C07C47/542C07C49/786C07C49/403C07C47/02C07D307/48
Inventor 宋亮马修强霍翔宇郝坤李金徽
Owner SHANDONG UNIV OF SCI & TECH
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