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Modified carbon nitride photocatalyst, preparation method thereof, and method for synthesizing xylosic acid by photocatalytic oxidation of xylose

A photocatalytic oxidation and catalyst technology, which is applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of difficult separation of by-products, strict requirements for experimental conditions, and difficult conditions to control, etc. Mild conditions, safe synthesis method, good thermal stability

Active Publication Date: 2018-12-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production conditions of the biological oxidation method are mild and environmentally friendly, but the experimental conditions are strict, the cycle is long, and the by-products are difficult to separate, which affects the purity of the product
The intermediate steps in the homogeneous catalytic oxidation process are complicated, there are many by-products, the products are difficult to separate, the catalyst is difficult to recycle, and the wastes cause great harm to the environment
The electrolytic oxidation method solves the shortcomings of the biological fermentation method and the homogeneous chemical oxidation method with many by-products and cumbersome steps, but the industrial production consumes a lot of energy and the conditions are not easy to control
Heterogeneous catalytic oxidation uses supported noble metal materials as catalysts, oxygen (or air) as oxidant, and catalyzes the oxidation of sugars to prepare sugar acids and corresponding derivatives under alkaline or neutral conditions, but there are also reaction conditions that require high temperature, high pressure, etc. question

Method used

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  • Modified carbon nitride photocatalyst, preparation method thereof, and method for synthesizing xylosic acid by photocatalytic oxidation of xylose
  • Modified carbon nitride photocatalyst, preparation method thereof, and method for synthesizing xylosic acid by photocatalytic oxidation of xylose
  • Modified carbon nitride photocatalyst, preparation method thereof, and method for synthesizing xylosic acid by photocatalytic oxidation of xylose

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] A preparation method of modified carbon nitride photocatalyst, comprising the following steps:

[0054] (1) Add 10g of nitrogen-containing organic precursor urea into 30mL of water, and then add 0, 0.005g, 0.01g, 0.05g, 0.1g, 0.5g, 1g of chlorine-containing salt compound AlCl 3 ·6H 2 O, after stirring evenly at room temperature, heat and evaporate water at 60°C, grind thoroughly to obtain a solid product;

[0055] (2) calcining the solid product of step (1) at 550° C. for 4 hours to obtain a calcined product;

[0056] (3) The calcined product of step (2) was treated with 20% hydrofluoric acid for 10 hours to remove metal ions, then centrifuged, washed with water, and dried at 80°C for 12 hours to obtain g-C 3 N x Photocatalytic material (g-C 3 N x -n, n=0, 0.005, 0.01, 0.05, 0.1, 0.5, 1.0).

Embodiment 2

[0058] A preparation method of modified carbon nitride photocatalyst, comprising the following steps:

[0059] The nitrogen-containing organic precursor of step (1) is replaced by thiourea, AlCl 3 ·6H 2 The consumption of O is changed into 1g, and all the other conditions are with embodiment 1;

[0060] Step (2), step (3) are the same as embodiment 1.

Embodiment 3

[0062] A preparation method of modified carbon nitride photocatalyst, comprising the following steps:

[0063] The nitrogen-containing organic precursor of step (1) is replaced by dicyandiamide, AlCl 3 ·6H 2 The consumption of O is changed into 1g, and all the other conditions are with embodiment 1;

[0064] Step (2), step (3) are the same as embodiment 1.

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Abstract

The invention belongs to the technical fields of catalysts and xylosic acid, and discloses a modified carbon nitride photocatalyst, a preparation method thereof, and a method for synthesizing xylosicacid by photocatalytic oxidation of xylose. The preparation method of the photocatalyst comprises the following steps: (1) uniformly mixing a nitrogen-containing organic matter precursor with a low-melting point chlorine-containing salt compound in a solvent, and removing the solvent to obtain a solid product; and (2) performing calcining, acid treatment, washing and drying on the solid product toobtain the modified carbon nitride photocatalyst. The modified carbon nitride photocatalyst is used for photocatalytic oxidation of xylose to synthesize xylosic acid. The method for synthesizing xylosic acid is characterized in that the photocatalytic oxidation of the xylose is carried out in an alkaline solution under an illuminating condition in the presence of the modified carbon nitride photocatalyst to obtain the xylosic acid. The photocatalyst has the advantages of good thermal stability, high catalytic activity and good recyclability. The method for successfully synthesizing xylosic acid by photocatalytic oxidation of xylose through using the photocatalyst has the advantages of good safety, non-toxicity, quick effect, low energy consumption, high yield of the xylosic acid, and easiness in realizing industrial production.

Description

technical field [0001] The invention relates to a modified carbon nitride photocatalyst and a method for its preparation and photocatalytic oxidation of xylose to synthesize xylonic acid, belonging to the technical field of catalysts and xylonic acid. Background technique [0002] With the depletion of non-renewable resources such as petroleum, the production of chemical products from renewable biomass has become a trend to achieve sustainable development of the chemical industry. As an important biomass raw material, lignocellulose is mainly composed of hemicellulose and cellulose, which can be used in biorefinery to produce bioliquid fuels (such as fuel ethanol or butanol) and other biobased chemicals. As a key resource for the development of bio-economy and biomass conversion, lignocellulosic raw materials are of great significance for promoting the world's low-carbon economy, maintaining energy security, and improving ecological economy and social economy. As the second...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/08C07C51/295C07C59/105
CPCC07C51/295B01J27/24B01J37/082B01J35/39C07C59/105
Inventor 彭新文马纪亮钟林新
Owner SOUTH CHINA UNIV OF TECH
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