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A preparation method, application and photocatalytic hydrogen peroxide detection method of a nano-polyethyleneimine grafted phenolic resin

A technology of polyethyleneimine and phenolic resin, which is applied in the field of nanomaterials, can solve the problems of less electrons and insufficient separation of photogenerated electrons and holes, and achieve the effects of good selectivity, promotion of tuning oxygen reduction, and good photocatalytic activity

Active Publication Date: 2022-04-08
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the photocatalysts reported so far have the shortcomings of insufficient photogenerated electron-hole separation and too few electrons available for oxygen reduction to produce hydrogen peroxide.

Method used

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  • A preparation method, application and photocatalytic hydrogen peroxide detection method of a nano-polyethyleneimine grafted phenolic resin
  • A preparation method, application and photocatalytic hydrogen peroxide detection method of a nano-polyethyleneimine grafted phenolic resin
  • A preparation method, application and photocatalytic hydrogen peroxide detection method of a nano-polyethyleneimine grafted phenolic resin

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Experimental program
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Effect test

Embodiment 1

[0076] Preparation of phenolic resin nanomaterials:

[0077] Add 20ml of deionized water and 8ml of absolute ethanol into a round bottom flask, then add 0.15g of resorcinol, stir and sonicate to make it evenly dispersed. Then add 0.21ml of formaldehyde solution, stir and sonicate to make it evenly mixed; finally add 0.1ml of ammonia water, and continue stirring for 12h in a 30°C water bath. The stirred solution is centrifuged, washed with ethanol and water respectively until the supernatant is neutral, and the obtained solid is dried in a vacuum oven to obtain a phenolic resin nanomaterial.

[0078] Preparation molecular weight is the polyethylenimine grafted phenolic resin nano material of 7W:

[0079] Add 0.1 g of prepared phenolic resin nanomaterials to 200 ml of deionized water, ultrasonically disperse the nanomaterials at room temperature, then add 1M sodium hydroxide solution into the dispersion liquid, stir, and adjust the solution to pH=10; 0.4g of polyethyleneimine ...

Embodiment 2

[0081] Detection of hydrogen peroxide produced by the photocatalytic reaction of polyethyleneimine grafted phenolic resin nanomaterials with a molecular weight of 7W:

[0082] After the photocatalytic reaction started, 1ml samples were taken at 0min, 20min, 40min, 60min, 80min, 100min, and 120min, and placed in a 7ml centrifuge tube. After the reaction, the obtained sample was centrifuged at a rotation speed of 10000 rpm for 10 min, and the supernatant was passed through a polytetrafluoroethylene filter membrane. Take 0.5ml of the filtrate after passing through the membrane and add it to a 7ml centrifuge tube, then add 2ml of concentrated sulfuric acid solution with a concentration of 0.84M, shake and shake well, then add 1ml of potassium titanium oxalate solution with a concentration of 0.028M, shake and shake well. The obtained mixed solution was placed in a dark room for color reaction for 10 minutes, and the absorbance of the orange solution at 400 nm was detected by an ul...

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Abstract

The invention provides a method for preparing a catalyst based on polyethyleneimine (PEI) grafted phenolic resin nanomaterials (RFs), and a method for detecting hydrogen peroxide produced by a photocatalytic reaction. It can be well applied, and the detection method has high sensitivity and good accuracy. The method of the present invention can control polyethyleneimine grafted phenolic resins with different molecular weights by adjusting the positive and negative of Zeta potential, and the obtained polyethyleneimine grafted phenolic resin nanomaterials have the functions of improving electron-hole separation efficiency and synchronously tuning oxygen Reduction characteristics, showing excellent photocatalytic activity. When hydrogen peroxide generated by photocatalytic reaction is measured by titanium potassium oxalate ultraviolet spectrophotometry, the reaction between titanium ion and hydrogen peroxide in the solution is a complex reaction, which does not react with other impurity ions, and the hydrogen peroxide produced by photocatalytic reaction can be realized. Accurate detection, effectively improve the accuracy of detection.

Description

technical field [0001] The invention relates to a preparation method of a polyethyleneimine grafted phenolic resin nano material, its use and its detection method in the application of photocatalytic reaction to produce hydrogen peroxide, and belongs to the technical field of nano materials. Background technique [0002] As an efficient and environment-friendly oxidizing agent, hydrogen peroxide has received extensive attention in the past 200 years and is listed as one of the 100 most important chemicals in the world. It is widely used in organic synthesis, wastewater treatment, sterilization and paper industry. The hydrogen peroxide produced by the traditional anthraquinone method accounts for more than 95% of the total production of hydrogen peroxide. However, the anthraquinone method has the disadvantages of requiring a noble metal catalyst and hydrogen activation to regenerate anthraquinone. Therefore, a photocatalytic hydrogen peroxide production method that does not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00G01N21/78G01N21/33B01J31/06B01J35/00
CPCC08G81/00G01N21/78G01N21/33B01J31/06B01J35/39
Inventor 周亮雷菊英周易张宁林素芬刘勇弟张金龙
Owner EAST CHINA UNIV OF SCI & TECH