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Preparation method and application of a composite biomass airgel photothermal conversion material

A light-to-heat conversion material and biomass material technology, applied in chemical instruments and methods, general water supply conservation, water/sludge/sewage treatment, etc., can solve problems that restrict human survival and development, by-products are harmful to the environment, and fresh water resources are limited and other problems, to achieve good light absorption performance, efficient water evaporation, and simple preparation process

Active Publication Date: 2021-08-03
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in order to solve the increasingly scarce energy crisis, mankind has proposed a sustainable development strategy, seeking renewable, green and environmentally friendly energy, and focusing on various forms of energy such as solar energy, wind energy, tides, and geothermal energy; The research has become a hot spot. Using photothermal conversion materials to convert solar energy into heat energy to locally heat water bodies and obtain drinkable fresh water has very considerable application prospects; the total reserves of water resources on the earth are 1.4 billion cubic kilometers, but the reserves of fresh water resources It only accounts for 2.53% of the total reserves, and 68.7% of them belong to solid glaciers, which are distributed in the hard-to-use high mountains and the north and south polar regions, and some fresh water is buried deep underground, which is difficult to exploit, plus With the continuous modernization process of human society, precious fresh water resources are polluted, and the fresh water resources left for human beings are very limited, which restricts the survival and development of human beings.
[0003] Therefore, the research on photothermal conversion materials is very in line with the needs of the times. The photothermal materials currently studied mainly include noble metal nanoparticles, carbon-based nanomaterials, some black nano-semiconductors, and some polymer materials with good absorption capacity for visible light; however, most The synthesis methods of photothermal conversion materials are complex, expensive, by-products and harmful to the environment, which restrict their wide application.

Method used

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  • Preparation method and application of a composite biomass airgel photothermal conversion material
  • Preparation method and application of a composite biomass airgel photothermal conversion material
  • Preparation method and application of a composite biomass airgel photothermal conversion material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: Compositing of 300°C carbonized pomelo peel powder and chitosan

[0033] A preparation method of a composite biomass airgel light-to-heat conversion material, the method comprising the following steps:

[0034] 1) First put the discarded pomelo peel into a blast drying oven at a constant temperature of 60-100°C to dry, weigh 5-10 g of dried pomelo peel and place it in a vacuum tube furnace, feed nitrogen gas as a protective gas at a flow rate of 20 sccm, Carbonize the pomelo peel at 300°C, the heating rate is 1-5°C / min, and keep warm for 3-5 hours; grind the carbonized pomelo peel with an agate mortar, and sieve it with a 120-mesh (125 μm) stainless steel screen to obtain biomass carbon powder;

[0035] 2) 4.5g chitosan powder is poured in the 300ml acetic acid solution of 2wt%, is placed in the chitosan solution of the preparation 1.5wt% of magnetic stirrer stirring;

[0036] 3) Mix 0.1 g of the biomass carbon powder obtained in step 1) and the solution obt...

Embodiment 2

[0043] Referring to Example 1, the difference is that step 1) carbonization temperature is 500°C.

[0044] The prepared composite biomass airgel light-to-heat conversion material can see obvious layering phenomenon. The light-absorbing layer is a self-assembled porous structure and multi-level structure of disordered biomass carbonized powder, and the pores of plants are retained inside the carbon powder particles. The structure is conducive to the escape of water vapor, and the chitosan layer is an ordered three-dimensional honeycomb porous structure (such as image 3), the solar light absorption rate of the composite airgel is 96.26% in the range of 250-2500nm (such as Figure 4 shown).

Embodiment 3

[0046] Referring to Example 1, the difference is that step 1) carbonization temperature is 700°C.

[0047] The prepared composite biomass airgel light-to-heat conversion material can be seen to have obvious layering phenomenon. The light-absorbing layer is a disordered biomass carbonized powder, and the original pipe of the plant is retained inside, which is a three-dimensional honeycomb porous structure. The layer is an ordered three-dimensional honeycomb porous structure (such as Figure 5 ), the solar light absorption rate of the composite airgel is 95.42% in the range of 250-2500nm (such as Image 6 shown).

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Abstract

The invention discloses a method for preparing a composite biomass airgel light-to-heat conversion material. The discarded biomass material is recycled, carbonized, ground and sieved, and then mixed with a chitosan solution to prepare a light-to-heat conversion airgel. The composite material has a simple preparation process and low cost. The obtained material is non-toxic, degradable, and environmentally friendly. It has high solar steam efficiency and meets the requirements of sustainable development today. It can be used for seawater desalination and sewage treatment, and has wide application prospects.

Description

Technical field: [0001] The invention relates to the technical field of solar photothermal conversion, in particular to a preparation method and application of a composite biomass airgel photothermal conversion material. Background technique: [0002] At present, in order to solve the increasingly scarce energy crisis, mankind has proposed a sustainable development strategy, seeking renewable, green and environmentally friendly energy, and focusing on various forms of energy such as solar energy, wind energy, tides, and geothermal energy; The research has become a hot spot. Using photothermal conversion materials to convert solar energy into heat energy to locally heat water bodies and obtain drinkable fresh water has very considerable application prospects; the total reserves of water resources on the earth are 1.4 billion cubic kilometers, but the reserves of fresh water resources It only accounts for 2.53% of the total reserves, and 68.7% of them belong to solid glaciers,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/08C08K3/04C08J9/28C02F1/14C02F103/08
CPCC02F1/14C02F2103/08C08J9/28C08J2201/0482C08J2305/08C08K3/04Y02A20/124Y02A20/142Y02A20/212
Inventor 苗蕾顾宇飞周建华王鹏飞
Owner GUILIN UNIV OF ELECTRONIC TECH
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