Sunlight-driven water purifying material and preparation method and application thereof

A technology for purifying materials and driving water, which is applied in chemical instruments and methods, general water supply saving, gel preparation, etc. It can solve the problems of pressurization, low efficiency of light and heat evaporation water, and low efficiency, so as to improve utilization rate and high efficiency The effects of interception performance and high-efficiency solar-to-thermal conversion performance

Active Publication Date: 2019-02-19
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when it is used as a nanofiltration membrane, it also faces the problem of pressurization during use, and the efficiency of filtration is still very low by relying on gravity alone
And limited by factors such as photothermal conversion temperature and heat utilization rate, the efficiency of photothermal water evaporation is often low, and it is urgent to find new ways to improve the efficiency of solar water evaporation

Method used

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  • Sunlight-driven water purifying material and preparation method and application thereof
  • Sunlight-driven water purifying material and preparation method and application thereof
  • Sunlight-driven water purifying material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]Embodiment 1, the preparation of sunlight-driven water purification material

[0043] For the preparation of double skeleton structure, this example prepares a polyamide foam with a size of 5.5cm×8.0cm×1cm, mixes 20mg of ammonium persulfate and 20 microliters of N,N,N',N'-tetramethylmethylene di The amine was added to 20 mL of deionized water, and the solution was evenly sprayed on the polycyanamide foam with a sprayer, and dried at room temperature. At the same time, 2.264 g of N-isopropylacryloyl and 120 mg of N,N'-methylenebisacryloyl were ultrasonically dissolved into 20 mL of deionized water, soaked with ammonium persulfate and N,N,N',N' -The polycyanamide foam of tetramethylmethylenediamine adsorbs the solution, seals it at room temperature, and lets it stand for 12 hours, takes out the double-skeleton hydrogel, and dialyzes it in deionized water for 1 day to remove unreacted substances.

[0044] Weigh 100mg of graphene oxide prepared by Hummers, ultrasonically di...

Embodiment 2

[0048] Embodiment 2, sunlight drives water purification material to purify water

[0049] Purify water as follows:

[0050] 1) The white side of the uncoated graphene oxide of the material prepared in Example 1 is placed downwards, and the black side coated with the graphene oxide film is placed upwards in the funnel, the upper part of the funnel is sealed, and placed in a solar simulator light source Under the launch port, place a conical flask or other water collection device at the lower end of the funnel;

[0051] 2) Turn on the light source, the incident light is converted into heat energy by the graphene oxide coated on the periphery, heating the internal double skeleton structure, the hydrogel structure collapses and squeezes out the adsorbed water, and at the same time part of the water evaporates into the closed funnel, Condensation occurs on the wall of the funnel, which flows back into the collection device at the lower end;

[0052] 3) Transfer the water purifica...

Embodiment 3

[0054] Embodiment 3, the purification of single molecule by sunlight-driven water purification material

[0055] This example uses common organic dye molecules to demonstrate the purification effect of sunlight-driven water purification materials on a single molecule. The selected molecules include rhodamine B (rhodamine B, RB), rhodamine 6G (rhodamine 6G, RGG), methyl Methyl orange (CR), methylene blue (MLB), Evans blue (EB), basic fuchsin (BF) and brilliant yellow (BY) were used as the research objects. The above organic dyes were prepared into 50mgmL -1 , 100mgmL -1 and 200mgmL -1 In the aqueous solution, the materials prepared in Example 1 were respectively soaked in the above solution, and after being balanced, they were transferred to the funnel. According to the steps of Example 2, the device was irradiated with natural sunlight to complete the water collection, and the ultraviolet-visible spectrum was used to irradiate the device. Draw the working curve of different...

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Abstract

The invention discloses a sunlight-driven water purifying material and a preparation method and application thereof. The sunlight-driven water purifying material comprises a framework structure made of a hydrophilic material, and polyN-isopropylacrylamide hydrogel is grown on the framework structure and coated with a coating film having molecular or ionic screening effect. By uniformly coating a graphene oxide nanofilm on the periphery of the polyN-isopropylacrylamide hydrogel, the material can be endowed with ability of filtering ions and molecules; a graphene oxide coating can convert incident light into heat energy when receiving sunlight irradiation to heat the hydrogel inside to extrude moisture absorbed by the hydrogel and evaporate the same at the same time, so that water treatmentefficiency of the material is improved greatly.

Description

technical field [0001] The invention relates to a sunlight-driven water purification material and a preparation method and application thereof, belonging to the field of energy materials. Background technique [0002] As a country with a large population, my country has less than 2,300 cubic meters of fresh water per capita, and most cities, especially those in the northwest, are still in a state of water shortage or severe water shortage. How to obtain clean and drinkable water from seawater or polluted water has increasingly become an important research topic for scientific researchers, which has very important academic value and practical significance. Water desalination and organic matter removal are very important ways to obtain fresh water. At present, multi-stage evaporation, distillation and reverse osmosis technology of seawater are mainly used. However, the investment cost of this desalination or organic matter removal technology is high, and operation and maintena...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02C02F1/44C02F1/14C02F1/28B01J13/00C02F103/08
CPCB01D71/024B01J13/0052B01J13/0065B01J13/0069C02F1/14C02F1/285C02F1/444C02F2103/08C02F2303/16Y02A20/212
Inventor 曲良体李春耿洪亚
Owner TSINGHUA UNIV
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