Lotus leaf-based photothermal conversion material preparing method

A light-to-heat conversion material and light-to-heat conversion layer technology, which is applied in heat exchange materials, steam generation methods using solar energy, chemical instruments and methods, etc., to achieve the effects of low preparation cost, simple process and good repeatability

Active Publication Date: 2019-04-05
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

So far, there has not been any report on the application of lotus leaves in water evaporation

Method used

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  • Lotus leaf-based photothermal conversion material preparing method
  • Lotus leaf-based photothermal conversion material preparing method
  • Lotus leaf-based photothermal conversion material preparing method

Examples

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Embodiment

[0029] A method for preparing light-to-heat conversion materials based on lotus leaves, specifically comprising the following steps:

[0030] Step 1. Take a certain amount of fresh lotus leaves, and then place them in deionized water for ultrasonic cleaning. The time is 15 minutes, and the ultrasonic frequency is 50Hz. For use, the thickness of the selected lotus leaf is about 0.5mm, and the diameter is about 2.5cm;

[0031] Step 2. Put the lotus leaf leaves to be used in step 1 into the freezer of the refrigerator, and freeze at -18°C for 24 hours to obtain frozen sample A;

[0032] Step 3. Put the frozen sample A obtained in step 2 into a vacuum freeze-drying box, and dry it for 72 hours under the conditions of a vacuum degree of 8Pa and a temperature of -45°C to obtain a dried lotus leaf sample B;

[0033] Step 4. Place the sample B obtained in step 3 in a tube furnace, raise the temperature to 500°C at a heating rate of 2°C / min under a nitrogen atmosphere, and keep it at ...

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Abstract

A lotus leaf-based photothermal conversion material preparing method belongs to the technical field of preparation of solar energy photothermal conversion materials. The lotus leaf-based photothermalconversion material preparing method comprises 1) cleaning and drying fresh lotus leaves; 2) freezing the processed lotus leaves at -18--24 DEG C for 12-24 h to obtain a frozen sample A; 3) drying thefrozen sample A in a vacuum freeze-drying cabinet at a vacuum degree of 6-10 Pa and a temperature of -30--50 DEG C for 48-72 h to obtain a dried sample B; 4) carbonizing the sample B in a nitrogen atmosphere at 500-700 DEG C for 4-6 h to obtain carbonized lotus leaves. The lotus leaf-based photothermal conversion material preparing method has the advantages of being low in preparation cost, goodin repeatability, simple in process, capable of achieving large-scale production and the like; the obtained carbonized lotus leaves have properties of hydrophilicity, transmission water channels, highthermal and light absorbency and the like and can be applied to the field of solar water evaporation.

Description

technical field [0001] The invention belongs to the technical field of preparation of solar photothermal conversion materials, and in particular relates to a method for preparing photothermal conversion materials based on lotus leaves, and its application to a novel water vapor generation device. Background technique [0002] With the continuous advancement of science and technology, the problems of environmental pollution and energy shortage have become increasingly prominent. Research and development of new green and environmentally friendly materials to obtain the required resources is an important way to solve environmental and energy problems. As we all know, sunlight is the most abundant resource in the world, which can in principle meet global energy needs, such as solar steam power generation and solar water evaporation. Solar water evaporation technology has proven to be a promising technology for water purification by utilizing abundant renewable energy and is cons...

Claims

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Application Information

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IPC IPC(8): C09K5/14
CPCC09K5/14F22B1/006
Inventor 廖宇龙陈佳惠王晓艺邓鹏袁博韬张岱南向全军文天龙
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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