A kind of photocatalytic material polyimide and its preparation method and application

A technology of photocatalytic materials and polyimide, which is applied in the field of photocatalytic materials, can solve the problems of non-environmental protection and few types of preparation processes, and achieve the effects of avoiding metal ion pollution, simple operation, and environmentally friendly and simple process

Inactive Publication Date: 2017-05-10
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In summary, metal-free organic semiconductor photocatalytic materials have broad development prospects, but at present there are few types of materials, and the preparation process is not environmentally friendly.

Method used

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  • A kind of photocatalytic material polyimide and its preparation method and application
  • A kind of photocatalytic material polyimide and its preparation method and application
  • A kind of photocatalytic material polyimide and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 0.9343g (0.015mol) ethylene glycol and 5mL DMF into the autoclave, then add 3.2703g (0.015mol) pyromellitic dianhydride (PMDA) white powder, stir evenly, then heat to 180°C for esterification, and cool to room temperature Then add 1.2602g (0.010mol) melamine to it and react at a constant temperature of 180°C for 72 hours. After cooling to room temperature, stir and wash with acetone and distilled water respectively, and finally filter and dry to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: figure 1 shown. In the XRD pattern of PI, there appeared several new peaks that did not exist in the monomer, such as the peak at 2θ=13.35° and the strong peak at 2θ=27.76°. Among them, the strong peak at 2θ=27.76° corresponds to the interlayer spacing of 0.356nm between two-dimensional structures, and C 3 N 4 The interlayer spacing is close, indicating the formation of a two-dimensional covalent structure of...

Embodiment 2

[0037] Add 2.7906g (0.045mol) ethylene glycol and 5mL DMF into the autoclave, then add 3.2703g (0.015mol) pyromellitic anhydride white powder and stir evenly, then heat to 180°C for esterification, cool to room temperature and add 1. 2602 g (0.010 mol) of melamine was reacted at a constant temperature of 180 ° C for 72 hours, cooled to room temperature, stirred and washed with acetone and distilled water respectively, and finally filtered and dried to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: figure 2 shown. The XRD patterns of PI showed strong peaks at 2θ=13.4° and 2θ=27.92°. Among them, the strong peak at 2θ=27.92° corresponds to the interlayer spacing of 0.354nm between the two-dimensional structures, and C 3 N 4 Layer spacing is closer.

Embodiment 3

[0039] Add 5.5811g (0.090mol) ethylene glycol and 5mL DMF into the autoclave, then add 3.2703g (0.015mol) pyromellitic anhydride white powder and stir evenly, then heat to 180°C for esterification, cool to room temperature and add 1. 2602g (0.010mol) of melamine was reacted at a constant temperature of 180°C for 72 hours, cooled to room temperature, stirred and washed with acetone and distilled water respectively, and finally filtered and dried to obtain a polyimide photocatalytic material. The XRD patterns of polyimide photocatalytic materials are as follows: image 3 As shown, the SEM and TEM of polyimide photocatalytic materials are as Figure 4 with Figure 5 As shown, it can be seen from the microstructure that the material has a polymerized sheet structure.

[0040] Put 0.2g of the synthesized polyimide photocatalytic material into a 400mL quartz photocatalytic reactor, add 360mL of deionized water, 40mL of methanol as a sacrificial agent and 0.550mL of chloroplatinic ac...

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Abstract

The invention discloses a photocatalytic material polyimide, as well as a preparation method and applications thereof. The method comprises the following step: performing polymerization reaction to organic monomers in an organic solvent at the polymerization temperature of 120-200DEG C to obtain polyimide, wherein the first one in the organic monomers is chain polyols; the second one is anhydride functional group-containing aromatic anhydride or heterocyclic anhydrides; the third one is aromatic amine or heterocyclic amine containing three amine functional groups; the mole ratio of the first one to the second one is (1-6):1; and the mole ratio of the alcohols to the total monomers is (0.4-2.4):1. The photocatalytic material polyimide with visible light absorption performance can be obtained by performing thermal polymerization to simple specific monomers in the solvent, photocatalytic hydrogen can be performed by utilizing sunshine, and the photocatalytic material polyimide has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a photocatalytic material polyimide (polyimide, PI for short) and its preparation method and application. Background technique [0002] Energy and environmental issues are two major scientific and technological problems faced by human society today. With the depletion and non-renewability of traditional fossil energy, and the environmental pollution caused by its excessive use, it has become a bottleneck in the development of today's society. In order to seek to solve these scientific problems, researchers have conducted extensive research, and finally solar energy with clean, pollution-free and renewable properties has been favored. Promising technology. Therefore, the development of new photocatalytic materials that can utilize sunlight to purify the environment or perform energy conversion has become the focus of academic research. [0003] The development o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/10B01J31/06C01B3/06C02F1/30C02F1/32
CPCY02E60/36Y02W10/37
Inventor 王英周军马成海邹志刚
Owner NANJING UNIV
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