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Preparation method of photo-thermal seawater desalination film based on tea and photo-thermal seawater desalination film

A photothermal and tea powder technology, applied in chemical instruments and methods, seawater treatment, water/sewage treatment, etc., can solve the problems of membrane material durability, complicated preparation, and low stability

Pending Publication Date: 2021-07-30
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of this type of membrane material is more complicated, and the stability of starch in a humid environment is lower than that of cellulose, lignin, etc., and the durability of the prepared membrane material remains to be investigated.

Method used

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  • Preparation method of photo-thermal seawater desalination film based on tea and photo-thermal seawater desalination film
  • Preparation method of photo-thermal seawater desalination film based on tea and photo-thermal seawater desalination film
  • Preparation method of photo-thermal seawater desalination film based on tea and photo-thermal seawater desalination film

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preparation example Construction

[0021] A method for preparing a tea-based photothermal seawater desalination membrane is characterized in that the method comprises the following steps:

[0022] (1) Grinding the tea into tea powder after drying;

[0023] (2) dispersing the tea powder into a solvent to obtain a dispersion;

[0024] (3) The dispersion liquid is vacuum filtered onto the filter membrane to obtain a photothermal seawater desalination membrane.

[0025] Wherein, the tea can be tea leaves and / or tea dregs after brewing tea leaves; from an economic point of view, tea dregs after brewing tea leaves are preferred.

[0026] In the embodiment of the present invention, for the convenience of experiments, the tea residues are obtained by brewing tea leaves by the inventor himself, for example, by brewing, extracting and drying the tea leaves for 3-5 times. In industry, tea dregs can be obtained in large quantities at low cost, for example, by purchasing discarded tea dregs when tea beverage companies pro...

Embodiment 1

[0035] (1) Brewing and extracting black tea leaves for 5 times and drying;

[0036] (2) Put the dried black tea residue on a ball mill, and work at a speed of 500 rpm for 10 minutes to obtain black tea residue tea powder with an average particle size of 1.2 μm;

[0037] (3) Disperse 10 mg of black tea grounds powder into 20 g of distilled water to obtain a dispersion;

[0038] (4) Vacuum filter the dispersion liquid onto a polytetrafluoroethylene filter membrane for 30 minutes to obtain a photothermal seawater desalination membrane with a thickness of 5 mm, which is named E-BT.

Embodiment 2

[0040] (1) Green tea leaves are brewed and extracted 5 times and dried;

[0041] (2) Place the dried green tea dregs on a ball mill and work at a speed of 800 rpm for 30 minutes to obtain green tea dregs tea powder with an average particle size of 0.6 μm;

[0042] (3) Disperse 6 mg of green tea residue powder in 20 g of tetrahydrofuran to obtain a dispersion;

[0043] (4) Vacuum filter the dispersion onto the mixed cellulose ester membrane for 70 minutes to obtain a photothermal seawater desalination membrane with a thickness of 2.2 mm, which is named E-GT.

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Abstract

The invention provides a preparation method of a tea-based photo-thermal seawater desalination film and the photo-thermal seawater desalination film prepared by the method. The method comprises the following steps: (1) drying tea, and grinding into tea powder; (2) dispersing the tea powder into a solvent to obtain a dispersion liquid; and (3) carrying out vacuum filtration on the dispersion liquid to a filter membrane to obtain the photo-thermal seawater desalination membrane. According to the method provided by the invention, the raw materials are cheap and easy to obtain, the membrane preparation operation is simple and convenient, and the prepared membrane material can be recycled for multiple times and has industrial practicability.

Description

technical field [0001] The invention relates to the technical field of photothermal seawater desalination and utilization of biological resources, in particular to a method for preparing a tea-based photothermal seawater desalination film and the photothermal seawater desalination film prepared by the method. Background technique [0002] Solar vapor generation (SVG) is a typical water treatment technology that uses the conversion between sunlight and heat energy to make water molecules turn into water vapor below its evaporation temperature, and has been widely studied[ L. Zhao et al, Joule, 2020, 4, 2733]. However, in the process of water evaporation in the volumetric system, light reflection and thermal diffusion limit the conversion efficiency between the entire light and water vapor, resulting in a low water production rate. With the development of light and heat management technology, nano-scale structure and material design concept, interfacial solar vapor generation...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D61/36C02F1/14C02F1/44C02F103/08
CPCB01D67/0088B01D61/36C02F1/14C02F1/448C02F2103/08Y02A20/131Y02A20/212Y02A20/124Y02A20/142
Inventor 祝祥威金音董志月李雪银张婷蔡冬娜刘睿思
Owner HUBEI UNIV OF TECH
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