Graphene oxide-based porous photo-thermal material capable of efficiently generating solar steam, preparation method and application thereof

A technology of solar steam and graphene, which is applied in the steam generation method using solar energy, solar thermal energy, solar thermal power generation, etc., can solve the problem of reducing the photothermal conversion efficiency of photothermal materials

Pending Publication Date: 2021-12-10
NORTHWEST UNIVERSITY FOR NATIONALITIES
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Once the oil contaminates the pores, water molecules cannot be transported to the sample surface normally, which greatly reduces the photothermal conversion efficiency of photothermal materials.

Method used

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  • Graphene oxide-based porous photo-thermal material capable of efficiently generating solar steam, preparation method and application thereof
  • Graphene oxide-based porous photo-thermal material capable of efficiently generating solar steam, preparation method and application thereof
  • Graphene oxide-based porous photo-thermal material capable of efficiently generating solar steam, preparation method and application thereof

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preparation example Construction

[0030] The steps of the preparation method of the graphene oxide-based porous photothermal material capable of efficiently generating solar steam of the present invention are as follows:

[0031] 1. Preparation of graphene oxide by hummers method

[0032] (1) Graphite pre-oxidation

[0033] Take 7.5mL of concentrated sulfuric acid, 1.5g of potassium peroxodisulfate and 1.5g of phosphorus pentoxide in a 50mL three-necked flask, heat to 90°C, stir for 15min and then cool to 80°C. 1.8 g of graphite powder was slowly added thereto, the temperature was kept at 80° C., and the mixture was stirred for 4.5 h to form a black precipitated mixture. After the reaction, the mixture was cooled to room temperature, diluted with 300 mL of deionized water, allowed to stand overnight, washed with distilled water to neutralize the treated graphite, and dried at room temperature for 24 hours to obtain pre-oxidized graphite.

[0034] Among them, concentrated sulfuric acid and phosphorus pentoxid...

Embodiment 1

[0047] Example 1 Preparation of aligned graphene oxide-based porous photothermal materials

[0048] 1. Preparation of graphene oxide by hummers method

[0049] (1) Graphite pre-oxidation

[0050] Take 7.5mL of concentrated sulfuric acid, 1.5g of potassium peroxodisulfate and 1.5g of phosphorus pentoxide in a 50mL three-necked flask, heat to 90°C, stir for 15min and then cool to 80°C. 1.8 g of graphite powder was slowly added thereto, the temperature was kept at 80° C., and the mixture was stirred for 4.5 h to form a black precipitated mixture. After the reaction, the mixture was cooled to room temperature, diluted with 300 mL of deionized water, allowed to stand overnight, washed with distilled water until neutral, and dried at room temperature for 24 hours to obtain pre-oxidized graphite.

[0051] (2) Preparation of graphene oxide

[0052] Measure 19 mL of concentrated sulfuric acid into a 250 mL three-necked flask, and cool it to about 0°C with an ice-water bath. Add the...

Embodiment 2

[0062] Example 2 Preparation of hydrophilic and oleophobic graphene oxide-based porous photothermal material

[0063] (1) Preparation of aligned graphene oxide-based porous photothermal material (GO-1): the same as in Example 1.

[0064](2) Immerse GO-1 in polydiallyldimethylammonium chloride (PDDA, 1.0 mg / L) solution for 20 min to make the surface positively charged, and then immerse PDDA-modified GO-1 in alginic acid Ca was obtained after soaking in sodium salt solution (0.4wt%) for 2min and then in calcium chloride solution (0.1M) for 20min 2+ / Alginate hydrogel coating. Finally, the Ca 2+ / The surface covered by alginate hydrogel was immersed in PDDA solution (1.0 mg / L) for 2 min, then immersed in sodium perfluorooctanoate (PFO, 0.1 M) solution for 20 min, and dried at room temperature to obtain hydrophilic and oleophobic graphene oxide-based porous light Thermal material, named GO-2.

[0065] like figure 2 Shown in c is the scanning electron microscope image of the...

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Abstract

The invention provides a preparation method of a graphene oxide-based porous photo-thermal material capable of efficiently generating solar steam. The preparation method comprises the following steps: S1, preparing graphene oxide by a hummers method; S2, preparing a directionally arranged graphene oxide-based porous photo-thermal material; and S3, preparing a hydrophilic and oleophobic graphene oxide-based porous photo-thermal material. According to the invention, directional freezing and simple carbonization are taken as main means, and a synthesis method of the graphene oxide-based porous photo-thermal material which can efficiently generate solar steam and has aligned channels and oleophobicity is introduced; the invention further provides the application in seawater desalination and (oil-containing or dye-containing) wastewater purification treatment; and the graphene oxide-based porous photo-thermal material disclosed by the invention has relatively high solar energy conversion efficiency and excellent salt resistance and pollution resistance, and has a certain practical application value in the aspects of seawater desalination and (oil-containing and dye-containing) wastewater purification treatment in the future.

Description

technical field [0001] The invention relates to a graphene oxide-based porous photothermal material capable of efficiently generating solar steam, a preparation method and application thereof, and the application of the material in seawater desalination and (oil-containing, dye-containing) wastewater purification treatment. Background technique [0002] Nowadays, global warming and industrial pollution are becoming more and more serious. Traditional seawater desalination technologies, such as reverse osmosis (RO), microfiltration, ultrafiltration, multi-effect distillation, multi-stage flash evaporation, adsorption, etc., have low efficiency, high cost, The limitations of redundant operation and huge energy consumption, which exacerbate the greenhouse effect and environmental pollution, hinder their large-scale application. Therefore, the efficient production of fresh water by using clean energy as an input in a more practical way is urgent. Solar energy is an inexhaustible...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/198C01B32/194F24S70/10F22B1/00C02F1/14C02F103/08
CPCC01B32/198C01B32/194F24S70/10F22B1/006C02F1/14C02F2103/08C02F2101/308Y02E10/40Y02A20/124Y02A20/142Y02A20/212Y02P20/10Y02P20/133
Inventor 哈斯其美格陈丽华张禹晗肖朝虎苏小平郭玉萍
Owner NORTHWEST UNIVERSITY FOR NATIONALITIES
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