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A polydopamine/tea polyphenol/cellulose composite photothermal gel and its preparation method

A technology of cellulose airgel and polydopamine, applied in chemical instruments and methods, water/sludge/sewage treatment, general water supply conservation, etc., can solve the problems of high seawater desalination cost, high cost, unfavorable promotion and use, etc. , to achieve the effects of large water repair potential, accelerated capillary action, and excellent solar evaporation performance

Active Publication Date: 2022-01-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Historically, the roadblock to desalination everywhere has been the cost, which has been prohibitively high
The traditional seawater desalination materials made of polydopamine either require a large amount of dopamine to be fed, or require high-cost materials such as silver nitrate to work together, all of which require high seawater desalination costs, which is not conducive to large-scale promotion and use in actual production.

Method used

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  • A polydopamine/tea polyphenol/cellulose composite photothermal gel and its preparation method
  • A polydopamine/tea polyphenol/cellulose composite photothermal gel and its preparation method
  • A polydopamine/tea polyphenol/cellulose composite photothermal gel and its preparation method

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preparation example Construction

[0064] On the one hand, the present invention provides a preparation method of polydopamine / tea polyphenol / cellulose composite photothermal gel,

[0065] S1 preparation of cellulose airgel:

[0066] Specifically, its methods include:

[0067] S11 prepares NaOH urea aqueous solution, freezing;

[0068] The NaOH urea aqueous solution in this step is calculated in 100mL; wherein, the mass fraction ratio of NaOH and urea is 7~12wt% and 12~17wt%; the freezing refers to keeping at -18~-4°C for 1~3h ;

[0069] S12 stirs and fully dissolves the cotton in the NaOH urea aqueous solution;

[0070] In this step, the cotton is counted as 2g; wherein, in order to fully dissolve the cotton, it can be vigorously stirred at room temperature;

[0071] S13 adding a crosslinking agent to the cellulose solution to obtain a hydrogel;

[0072] Cross-linking agent is in 5mL; wherein cross-linking agent is preferably epichlorohydrin (ECH), and those skilled in the art can also adopt other cross-l...

Embodiment 1

[0090] A preparation method of polydopamine / tea polyphenol / cellulose composite photothermal gel, the steps are as follows:

[0091] S1 Preparation of cellulose airgel

[0092] Specifically, its methods include:

[0093] S11 Prepare 100 mL of NaOH urea aqueous solution and keep it at -18°C for 1 hour;

[0094] Wherein, in the NaOH urea aqueous solution, the mass fraction ratio of NaOH and urea is 7wt% and 12wt%;

[0095] S12 Stir vigorously at room temperature, fully dissolve 2 g of cotton in aqueous NaOH urea solution;

[0096] S13 Add 5 mL of epichlorohydrin (ECH) as a cross-linking agent to the cellulose solution to obtain a hydrogel;

[0097] S14 immersing the hydrogel in deionized water to remove excess chemicals;

[0098] S15 Freeze the hydrogel overnight at -18°C, and then freeze-dry it at a condenser temperature of -50°C to generate cellulose airgel.

[0099] S2 Preparation of polydopamine / tea polyphenol / cellulose composite photothermal gel

[0100] Specifically, ...

Embodiment 2

[0106] A preparation method of polydopamine / tea polyphenol / cellulose composite photothermal gel, the steps are as follows:

[0107] S1 Preparation of cellulose airgel

[0108] Specifically, its methods include:

[0109] S11 Prepare 100 mL of NaOH urea aqueous solution and keep it at -4°C for 3 hours;

[0110] Wherein, in the NaOH urea aqueous solution, the mass fraction ratio of NaOH and urea is 12wt% and 17wt%;

[0111] S12 Stir vigorously at room temperature, fully dissolve 2 g of cotton in aqueous NaOH urea solution;

[0112] S13 Add 5 mL of epichlorohydrin (ECH) as a cross-linking agent to the cellulose solution to obtain a hydrogel;

[0113] S14 immersing the hydrogel in deionized water to remove excess chemicals;

[0114] S15 Freeze the hydrogel overnight at -4°C, and then freeze-dry it at a condenser temperature of -30°C to generate cellulose airgel.

[0115] S2 Preparation of polydopamine / tea polyphenol / cellulose composite photothermal gel

[0116] Specifically, ...

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Abstract

In one aspect, the present invention provides a polydopamine / tea polyphenol / cellulose composite photothermal gel, a preparation method thereof and a solar energy collection device. The preparation method of airgel is: prepare NaOH urea aqueous solution, freeze, stir and dissolve the cotton, add cross-linking agent to obtain hydrogel, deionized water to remove excess chemical substances, freeze the hydrogel, and then in the condenser Freeze-dry to obtain cellulose airgel. The tea polyphenols are added into the dopamine hydrochloride solution, and mixed to obtain the dopamine hydrochloride tea polyphenols solution. The cellulose airgel is immersed in the ammonia solution, and then immersed in the above-mentioned dopamine hydrochloride tea polyphenol solution, and the polydopamine / tea polyphenol film is coated in situ on the cellulose airgel, washed with deionized water, and freeze-dried to obtain Polydopamine / tea polyphenol / cellulose composite photothermal gel. The composite photothermal gel of the present invention reaches about 1.12kg m under one sunlight irradiation ‑1 h ‑1 High water evaporation rate, energy efficiency is about 82%.

Description

technical field [0001] The invention provides a polydopamine / tea polyphenol / cellulose composite photothermal gel and a preparation method thereof, belonging to the technical field of clean energy. Background technique [0002] Clean water is one of the daily necessities for human survival and social development. However, insufficient access to clean water plagues an increasing number of people. To address this issue, obtaining clean water from seawater and wastewater is considered to be a feasible and effective strategy to alleviate water scarcity. So far, solar steam generation has proven to be a promising technology by converting solar energy into heat for water evaporation. [0003] In order to improve the solar thermal efficiency, many photothermal evaporators have been well documented in the prior art, including metallic materials, carbon-based materials, and organic polymers. Meanwhile, these photothermal materials have been fabricated into thermal positioning layer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36C08J9/40C08L1/02C02F1/04C02F1/14C02F1/28C02F101/30
CPCC08J9/365C08J9/40C02F1/14C02F1/048C02F1/285C02F1/286C08J2301/02C02F2101/30Y02A20/212
Inventor 李乙文陈鹏郭馨宇徐豪朱瑾瑶乔晴李昊天
Owner SICHUAN UNIV