Leaf-like porous membrane composite PPy/PVA sponge and preparation method and application thereof

A porous membrane and sponge technology, applied in the field of imitation leaf porous membrane composite PPy/PVA sponge and its preparation, can solve the problems of low conversion efficiency of light, heat and steam, alleviate the global energy and fresh water shortage crisis, and have good desalination and purification capabilities Effect

Active Publication Date: 2021-06-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, photothermal steam conversion materials are improved from two-dimensional structures (such as films, paper, felt and fabrics), and there is still the problem of low photothermal steam conversion efficiency.

Method used

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  • Leaf-like porous membrane composite PPy/PVA sponge and preparation method and application thereof
  • Leaf-like porous membrane composite PPy/PVA sponge and preparation method and application thereof
  • Leaf-like porous membrane composite PPy/PVA sponge and preparation method and application thereof

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preparation example Construction

[0041] The invention provides a method for preparing a leaf-like porous film composite PPy / PVA sponge, comprising the following steps:

[0042] Soak the polyvinyl alcohol sponge in FeCl 3 In the solution, obtain the pretreatment polyvinyl alcohol sponge;

[0043] Contacting the pretreated polyvinyl alcohol sponge with pyrrole, and in-situ chemical vapor deposition of polypyrrole on the pretreated polyvinyl alcohol sponge to obtain a PPy / PVA sponge;

[0044] The PPy / PVA sponge is dipped in a styrene-acrylonitrile copolymer solution, and the water drop template method is used to form a film, so as to obtain the composite PPy / PVA sponge with imitation leaf porous membrane.

[0045] In the present invention, unless otherwise specified, the raw materials used are commercially available products in the art.

[0046] The present invention soaks polyvinyl alcohol (PVA) sponge in FeCl 3 After being removed from the solution, a pretreated polyvinyl alcohol sponge was obtained.

[00...

Embodiment 1

[0073] PPy / PVA sponges were prepared in a vacuum oven. Put ferric chloride and ethanol into an Erlenmeyer flask, stir at 25°C for 1 hour, and prepare FeCl with a FeCl concentration of 1mol / L 3 solution. PVA sponge (1cm3 ) into FeCl 3 Soak in the solution (1 mL), then take it out and place it in a vacuum drying oven with 2 mL of pyrrole, keep the vacuum degree of the vacuum drying oven at 0.6, the temperature at 25 ° C, and react for 4 hours. After the reaction, the sample was taken out and washed 3 times with absolute ethanol, and dried in a blast drying oven. The sponge appeared black, indicating that PPy had been successfully loaded on the PVA sponge to obtain a PPy / PVA sponge.

[0074] The SEM of the uncoated PPy PVA sponge and the prepared PPy / PVA sponge are as follows: figure 2 and image 3 shown. Depend on Figure 2~3 It can be seen that polypyrrole (PPy) has been successfully attached to the PVA sponge skeleton.

[0075] Put styrene-acrylonitrile copolymer and c...

Embodiment 2～5

[0082] Same as Example 1, the only difference is that the concentration of SAN in the SAN solution is adjusted to 0.018, 0.020, 0.022 and 0.024g / mL respectively, and the obtained imitation leaf porous membrane composite PPy / PVA sponge is respectively recorded as HPF-2 and HPF-3 , HPF-4 and HPF-5.

[0083] Figure 9 It is the electron micrograph of the imitation leaf porous membrane composite PPy / PVA sponge that embodiment 1~5 makes, wherein a is HPF-1, b is HPF-2, c is HPF-3, d is HPF-4, e is HPF -5. Figure 10 It is a comparison chart of the most probable pore diameter and the equivalent perimeter per unit area of ​​the leaf-like porous membrane composite PPy / PVA sponge prepared in Examples 1-5. Depend on Figure 10 It can be seen that with the increase of the concentration of SAN solution, the pore size of the porous membrane layer of the leaf-like porous membrane composite PPy / PVA sponge (HPF) decreases, and the equivalent perimeter per unit area increases, HPF-1, HPF-2,...

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Abstract

The invention provides a leaf-like porous membrane composite PPy/PVA sponge and a preparation method and application thereof, and belongs to the technical field of photoelectrode materials. The method comprises the following steps: soaking PVA sponge in a FeCl3 solution and then making contact with pyrrole for chemical vapor deposition, and obtaining PPy/PVA sponge; dipping the PPy/PVA sponge in a styrene-acrylonitrile copolymer solution, and forming a film by a water drop template method to obtain the leaf-like porous film composite PPy/PVA sponge. According to the preparation method disclosed by the invention, the hydrophilicity of the PVA sponge with an intercommunicated microporous structure ensures the water supply property, meanwhile, small molecular water clusters are formed in a polymer network, so that the evaporation enthalpy of water is reduced, and the SAN hydrophobic honeycomb porous membrane is prepared by using a water drop template method by using a styrene-acrylonitrile copolymer solution; the SAN hydrophobic porous membrane is used as a surface, so that the escape speed of steam is increased, and the surface of the base material has hydrophobicity and a salt crystallization resisting function.

Description

technical field [0001] The invention relates to the technical field of photoelectrode materials, in particular to a leaf-like porous film composite PPy / PVA sponge and its preparation method and application. Background technique [0002] Traditional solar distillation uses the principle of heating the whole water. Due to the large optical loss and thermal loss, the solar steam conversion efficiency is low (30% to 50%), which limits the further use and application of this technology to a large extent. develop. After development, researchers discovered that metal nanofluids can be used to absorb solar energy. As a result, photothermal steam reforming devices have emerged as the times require. Due to the advantages of no conventional energy consumption, no pollution, and high purity of fresh water, it has gradually attracted people's attention. Photothermal steam conversion fundamentally eliminates the disadvantage of low energy conversion rate of traditional solar distillation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C02F1/14C08L29/04C08L79/04C08L25/12
CPCC02F1/14C08J9/36C08J9/405C08J2329/04C08J2425/12C08J2479/04Y02A20/212
Inventor 金欣李叶燃王闻宇李伟韩幸郑意德
Owner TIANJIN POLYTECHNIC UNIV
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