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Polyimide/cotton fiber hydrogen peroxide synthesis photocatalyst as well as preparation and application thereof

A technology of cotton fiber and polyimide, applied in the field of continuous synthesis of hydrogen peroxide, can solve unreached problems and achieve the effects of easy control, good processability, green safety and cost

Pending Publication Date: 2021-09-17
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current photocatalysts for hydrogen peroxide synthesis are far from meeting the above requirements.

Method used

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  • Polyimide/cotton fiber hydrogen peroxide synthesis photocatalyst as well as preparation and application thereof
  • Polyimide/cotton fiber hydrogen peroxide synthesis photocatalyst as well as preparation and application thereof
  • Polyimide/cotton fiber hydrogen peroxide synthesis photocatalyst as well as preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Stir and dissolve polyamic acid monomer diamine and dianhydride with a molar ratio of 1:1 (0.01mol:0.01mol) successively in 120mL N,N-dimethylformamide, add a few drops of isoquinoline, and stir to react The polyamic acid solution was formed overnight, and then the cotton fiber (5g) with a clean surface was placed in it, and mechanically stirred evenly, and then the reaction system was placed under the protection of a nitrogen flow, and the reaction temperature range was controlled at 120°C for 16 hours. Natural cooling, Filter, wash with ethanol and water to obtain a polyimide / cotton fiber hydrogen peroxide synthesis photocatalyst, and the polyimide / cotton loading capacity is 0.6 g / g.

[0050] In this example, polyamic acid monomer (diamine is 1,4-phenylenediamine, dianhydride is benzene-1,2,4,5-tetracarboxylic dianhydride) forms polyamic acid, and then ring-closing polycondensation forms The reaction formula of polyimide is as follows:

[0051]

[0052] figure 1 ...

Embodiment 2

[0059] Dissolve polyamic acid monomer diamine and dianhydride with a molar ratio of 1:1 (0.01mol:0.01mol) in 120mL dimethyl sulfoxide successively, add a few drops of isoquinoline, and stir overnight to form polyamide acid solution, and finally put the cotton fiber (5g) with clean surface in it, mechanically stir it evenly, and finally put the reaction system under the protection of nitrogen flow, control the reaction temperature range 180 ℃, time 8 hours, natural cooling, filtration, ethanol and The polyimide / cotton fiber hydrogen peroxide synthesis photocatalyst was obtained by washing with water, and the loading capacity of the polyimide / cotton was 0.6 g / g.

[0060] Put 20g of the above photocatalyst in the reactor, fill it up with water, adjust the flow rate of the gravity dropper to 100mL / h, and produce a stable hydrogen peroxide solution with a concentration of about 79mg / L after 8 hours of sunlight.

Embodiment 3

[0062] The polyamic acid monomer diamine and dianhydride with a molar ratio of 1:1 (0.005mol:0.005mol) were successively stirred and dissolved in 120mL of m-cresol, and a few drops of isoquinoline were added, and the reaction was stirred overnight to form polyamic acid solution, and finally put the cotton fiber (5g) with clean surface in it, mechanically stir it evenly, and then put the reaction system under the protection of nitrogen flow, control the reaction temperature range of 190°C for 16 hours, cool naturally, filter, ethanol and water The polyimide / cotton fiber hydrogen peroxide synthesis photocatalyst was obtained by washing, and the loading capacity of the polyimide / cotton was 0.3 g / g.

[0063] Put 20g of the above-mentioned photocatalyst in the reactor, fill it up with water, adjust the flow rate of the gravity dropper to 100mL / h, and produce a stable hydrogen peroxide solution with a concentration of about 65mg / L after 8 hours of sunlight.

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Abstract

The invention relates to a polyimide / cotton fiber hydrogen peroxide synthesis photocatalyst as well as preparation and application thereof. The photocatalyst comprises cotton fibers and a polyimide nanoparticle coating loaded on the cotton fibers, the preparation method comprises the following steps: dipping the cotton fiber in a polyamide acid solution, and carrying out a closed-loop polymerization reaction to obtain the polyimide nanoparticle coating loaded on the cotton fiber; the photocatalyst is used for catalyzing water and oxygen to react under illumination to prepare hydrogen peroxide. Compared with the prior art, the photocatalyst is good in activity and stability, has good machinability and can be used for efficiently catalyzing the reaction of water and oxygen under illumination to prepare hydrogen peroxide, the preparation process of the photocatalyst is simple, green, safe, low in cost and easy to control, and large-scale production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrogen peroxide continuous synthesis, and relates to a polyimide / cotton fiber hydrogen peroxide synthesis photocatalyst and its preparation and application. Background technique [0002] Hydrogen peroxide is a very common and widely used chemical, often used in bleaching, disinfection and chemical synthesis; at the same time, it is also a very green reagent, because from an atomic point of view, it will only release Water and oxygen, almost no environmentally harmful waste, no secondary treatment. However, the synthesis of hydrogen peroxide has always been a major problem in the chemical industry. At present, the most widely used industrial synthesis method is the catalytic hydrogenation of anthraquinone compounds with hydrogen, combined with subsequent oxygen oxidation, and obtaining high concentrations through extraction towers and concentration towers. hydrogen peroxide. This method involves a step...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J35/06C01B15/027
CPCB01J35/004B01J31/06B01J35/06C01B15/027
Inventor 李新昊林云霄陈接胜
Owner SHANGHAI JIAO TONG UNIV
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