Method for preparing wave absorbing materials from biomass carbon sources
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A technology of biomass carbon sources and absorbing materials, applied in carbon preparation/purification, chemical instruments and methods, and other chemical processes, can solve problems such as long synthesis time, complex synthesis methods, and pollution, and achieve improved technology Guaranteed effect
Active Publication Date: 2019-04-23
HUAIBEI NORMAL UNIVERSITY
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[0004] However, after careful analysis of the invention, it is found that it is prepared by a two-step method, the synthesis time is long, the synthesis method is complicated, and the use of high-value graphene and various organic solvents will still cause pollution during the preparation process.
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Embodiment 1
[0029] A method for preparing a wave absorbing material by utilizing a biomass carbon source, the synthesis steps are as follows:
[0030] 1. Perform ultrasonic treatment on the biomass carbon source with water, acetone and alcohol in turn to remove the surface impurities of the biomass carbon source;
[0031] 2. Put the treated biomass carbon source into a vacuum drying box for vacuum drying;
[0032] 3. Put the biomass carbon source after drying in step 2 into a container, place it in a tube furnace, precisely control the temperature and reaction time, and carry out the reaction;
[0033] 4. After the reaction in step 3, the temperature is lowered to room temperature, the container is taken out, the obtained semi-finished product is ground, and then plasma treatment is performed to obtain the finished product.
Embodiment 2
[0035] As an implementation of Example 1, the water in the first step is redistilled water, and the biomass carbon source is rice husk. The container in the step 3 is an alumina porcelain container, and the specific steps are as follows:
[0036] 1. Grind the rice husks with a grinder, obtain micron-sized rice husk powder through multiple grindings, and then place them in secondary water, acetone, and alcohol solutions in turn. minutes, then take out to vacuum dry for 24 hours;
[0037] 2. Take 2 grams of rice husks treated in step 1, put them in an alumina porcelain boat, place them in a tube furnace, then feed nitrogen for 20 minutes, then heat up 10 degrees per minute, slowly heat up to 900°C, and at 900°C After 4 hours of incubation at ℃, the temperature was lowered to terminate the reaction, and the whole process was kept in nitrogen;
[0038] 3. After cooling to room temperature, take out the alumina porcelain boat; pour the product into a mortar and grind for half an ...
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Abstract
The invention discloses a method for preparing wave absorbing materials from biomass carbon sources. The method includes synthesis steps of sequentially ultrasonically treating the biomass carbon sources by water, acetone and alcohol and removing surface impurities from the biomass carbon sources; placing the treated biomass carbon sources in vacuum drying tanks and carrying out vacuum drying on the treated biomass carbon sources; placing the biomass carbon sources dried at the second step into containers, placing the containers in tube furnaces and carrying out reaction at the accurately control temperatures for the accurately controlled reaction time; cooling semi-finished products until the temperatures of the semi-finished products reach the room temperature after the reaction is carried out at the third step, taking the semi-finished products out of the containers, grinding the obtained semi-finished products and then carrying out plasma treatment to obtain finished products. Themethod has the advantages that metal is omitted in preparation procedures, byproducts generated in agricultural production can be sufficiently utilized, generation of harmful substances is prevented in the preparation procedures, high-price raw materials are omitted, accordingly, the method is low in cost, high in performance and free of pollution and is sustainable, and technical support can be provided to popularization and widespread use of the wave absorbing materials.
Description
technical field [0001] The invention relates to a method for preparing a wave absorbing material by utilizing a biomass carbon source, and belongs to the technical field of functional materials. Background technique [0002] Electromagnetic wave pollution has always been a hot topic of research. Whether it is military, civil industry or daily life, it is necessary to prevent electromagnetic wave pollution. The existing preparation scheme of absorbing materials uses magnetic metal and carbon composite, and carbon materials have always been used as absorbing materials. Popular materials, including carbon nanotubes, graphene, biomass carbon, etc., magnetic metals such as iron, cobalt, nickel, and their oxides are currently popular absorbing materials. By using carbon material and magnetic metal composite, suitable impedance matching can be obtained by increasing the dielectric loss, and high-performance absorbing materials can be obtained. However, metal composite materials ine...
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