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Porous photo-thermal film with salt precipitation resistance and preparation and application thereof

A porous membrane and performance technology, applied in the field of solar seawater desalination, can solve the problems of low light absorption efficiency, wide, and can only absorb ultraviolet light, etc., achieve high light absorption performance, strong operability, and prevent the effect of salt precipitation

Active Publication Date: 2019-11-29
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above invention can also be used as a photothermal film for seawater desalination, the light absorption efficiency is low. This is because TiO2 itself has a wide band gap and can only absorb ultraviolet light. Although adding WO3 can expand the absorption range of visible light, ultraviolet light and visible light cannot absorb light. Only about 50% of the entire solar spectrum
[0006] In the present invention, TiNx with plasmon resonance effect is used as the light absorber, and the corrosion-resistant Ti mesh with different apertures is used as the support body, and the hydrophobic film with hierarchical porous structure is obtained through hydrophobic modification, which is expected to broaden the range of light absorption and improve the light absorption rate at the same time. thermal conversion performance and stability, this hydrophobic TiN x Research on application of photothermal film to solar seawater desalination

Method used

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  • Porous photo-thermal film with salt precipitation resistance and preparation and application thereof
  • Porous photo-thermal film with salt precipitation resistance and preparation and application thereof
  • Porous photo-thermal film with salt precipitation resistance and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Base Treatment

[0039] Sonicate 100-mesh Ti mesh (4cm*4cm, can be cut as needed) in acetone, alcohol, and deionized water for 30 minutes to remove surface impurities.

[0040] The second step: TiO 2 / Ti porous membrane preparation

[0041] Put the Ti grid treated in the above steps into 10M NaOH solution, keep it warm at 120°C for 12h for hydrothermal synthesis reaction, then perform ion exchange in 1M HCl solution for 10min, and finally anneal at 500°C for 0.5h, the heating rate 2°C·min -1 , and finally obtain TiO 2 / Ti hierarchical hole structure photothermal film, micropore 150um, nanopore about 500-600nm.

[0042] The third step: TiN x / Ti porous membrane preparation

[0043] TiO prepared by the above steps 2 / Ti porous membrane was nitrided at 1000°C to obtain TiN x / Ti porous membrane. The processing time is 7h, the working gas is NH 3 , air flow 10ml·min -1 .

[0044] Step Four: Hydrophobic Modification

[0045] The TiN prepared by the above...

Embodiment 2

[0050] Step 1: Base Treatment

[0051] Sonicate the 50-mesh Ti mesh (4cm*4cm, can be cut as needed) in acetone, alcohol, and deionized water for 30 minutes to remove surface impurities.

[0052] The second step: TiO 2 / Ti porous membrane preparation

[0053] Put the Ti mesh treated in the above steps into 10M NaOH solution, keep it warm at 120°C for 2h for hydrothermal synthesis reaction, then perform ion exchange in 1M HCl solution for 10min, and finally anneal at 500°C for 0.5h, the heating rate 2°C·min -1 , and finally obtain TiO 2 / Ti hierarchical hole structure photothermal film, the micropore is 270um, and the nanopore is about 100-200nm.

[0054] The third step: TiN x / Ti porous membrane preparation

[0055] TiO prepared by the above steps 2 / Ti porous membrane was nitrided at 1000°C to obtain TiN x / Ti porous membrane. The processing time is 7h, the working gas is NH 3 , air flow 10ml·min -1 .

[0056] Step Four: Hydrophobic Modification

[0057] The TiN p...

Embodiment 3

[0061] Step 1: Base Treatment

[0062] Sonicate 200-mesh Ti mesh (4cm*4cm, can be cut as needed) in acetone, alcohol, and deionized water for 30 minutes to remove surface impurities.

[0063] The second step: TiO 2 / Ti porous membrane preparation

[0064] Put the Ti net treated in the above steps into 10M NaOH solution, keep it warm at 120°C for 6h for hydrothermal synthesis reaction, then conduct ion exchange in 1M HCl solution for 10min, and finally anneal at 500°C for 0.5h, the heating rate 2°C·min -1 , and finally obtain TiO 2 / Ti hierarchical hole structure photothermal film, the micropore is 75um, and the nanopore is about 200-300nm.

[0065] The third step: TiN x / Ti porous membrane preparation

[0066] TiO prepared by the above steps 2 / Ti porous membrane was nitrided at 800°C to obtain TiN x / Ti porous membrane. The processing time is 10h, the working gas is NH 3 , air flow 10ml·min -1 .

[0067] Step Four: Hydrophobic Modification

[0068] The TiN prepar...

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Abstract

The invention discloses a porous photo-thermal film with salt precipitation resistance and preparation and application thereof. Seawater-corrosion-resistant metal Ti nets with different pore diametersare used as substrate materials to obtain TiO2 / Ti porous films with different pore diameters through hydrothermal synthesis reaction and control of reaction time; then TiNx with a plasma resonance effect is loaded on the surface of the Ti nets through a desalination reaction, the light absorption rate is increased, then a hydrophobic TiNx / Ti porous photo-thermal film is obtained through hydrophobic modification, and salt is prevented from being separated out in the seawater desalination process. The nitriding measure is adopted for the TiO2 / Ti porous film, although the TiNx / Ti porous film obtained after nitriding has good light absorption performance, the hydrophobicity is poor, the TiNx / Ti porous film is hydrophobically modified, the stability is improved, and salt precipitation is simulated.

Description

technical field [0001] The invention relates to the field of solar seawater desalination, in particular to a porous photothermal film with anti-salt precipitation performance and its preparation and application. The porous photothermal film of the invention uses interface photothermal conversion technology to achieve high-efficiency light absorption and effectively prevent salt precipitation during water evaporation, improving the water evaporation efficiency and stability of the porous photothermal film. Background technique [0002] The depletion of drinking water resources and the deterioration of sanitation conditions are one of the serious challenges facing human beings around the world. With the deepening of the concept of green shared development, as an important supply reserve of "open source", desalination of seawater has become an important way to solve the global water resource crisis. However, conventional seawater desalination technology has limited its wide ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/14G02B5/00F24S70/10C02F103/08
CPCC02F1/043C02F1/14C02F2103/08F24S70/10G02B5/003Y02E10/40Y02A20/124Y02A20/142Y02A20/212
Inventor 魏娜崔洪芝林媛李振奎徐瑞祺孙金全
Owner SHANDONG UNIV OF SCI & TECH
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