Preparation method of biomass-based nano-silica aerogel

A nano-silica, silicon dioxide technology, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., to achieve the effect of strong practicability, high thermal performance, and simple process

Inactive Publication Date: 2017-08-04
林扬东方(北京)科技有限公司
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  • Application Information

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Problems solved by technology

[0003] The present invention proposes a method for preparing biomass-based nano-silica airgel. The technical problem to be solved is to firstly extract nano-silica from straw by combining high-speed vibrating ball mill and ultrasonic dispersion. The preparation of airgel materials by nano-silica is beneficial to improve the properties of airgel such as porosity, pore structure and specific surface area.

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  • Preparation method of biomass-based nano-silica aerogel

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preparation example Construction

[0014] A preparation method of biomass-based nano-silica airgel, the method comprising the steps of:

[0015] (1) Put the straw into a pulverizer and process it into pieces, then completely soak it in dilute hydrochloric acid and heat it at 60-70°C for 1-2 hours, then wash it with water until neutral, and then dry it in an oven at 105°C until it is absolutely dry;

[0016] (2) Put the dry straw fragments in step (1) into the muffle furnace and calcinate at 570-770°C for 100-300 minutes in the air atmosphere, take out after calcining and quickly cool to obtain silica;

[0017] (3) Mill the silicon dioxide obtained in step (2) by a high-speed vibrating ball mill for 10 to 60 minutes, and then use an ultrasonic disperser to ultrasonically treat it at a power of 200w for 1 to 4 hours to obtain nanometer silicon dioxide;

[0018] (4) adding the nano silicon dioxide obtained in the step (3) to the NaOH solution, heating and reacting the above solution for 2 to 3 hours in a boiling s...

Embodiment 1

[0029] (1) Put 100g of rice straw into a straw grinder to grind, and screen out rice straw fragments that can pass through a 40-mesh sieve but cannot pass through a 60-mesh sieve;

[0030] (2) Take 40g of the screened rice straw fragments and put them into a 500mL beaker, soak them completely in dilute hydrochloric acid with a mass fraction of 6%, and heat them in a 60°C water bath for 1.5 hours. After heating and cooling to room temperature, wash with circulating water vacuum pump and distilled water until neutral;

[0031] (3) After the rice straw scraps are completely filtered and dried, they are put into an oven at 105°C and dried to absolute dryness. Then weigh 30g of dry rice straw and place it in a pre-fired crucible and place it on an electric furnace for carbonization, then move the crucible into a muffle furnace and calcinate at a high temperature of 570°C for 240min. Take out the crucible and let it cool down naturally in the air for 10 minutes, then move it into a...

Embodiment 2

[0039] (1) Put 200g of wheat straw into a straw grinder to crush, and screen out rice straw fragments that can pass through a 40-mesh sieve but cannot pass through a 60-mesh sieve;

[0040] (2) Take 50g of the screened wheat straw scraps and put them into a 500mL beaker with a mass fraction of 6% dilute hydrochloric acid to completely soak them, place them in a 70°C water bath and heat for 1 hour. After heating and cooling to room temperature, wash with circulating water vacuum pump and distilled water until neutral;

[0041] (3) After the wheat straw scraps are completely filtered out of water, they are dried in an oven at 105°C until they are absolutely dry. Then weigh 40g of dry wheat straw scraps and place them in a pre-fired crucible and put them on an electric furnace for carbonization, then move the crucible into a muffle furnace and calcinate at a high temperature of 770°C for 300min. Take out the crucible and let it cool down naturally in the air for 10 minutes, then...

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Abstract

The invention relates to a preparation method of biomass-based nano-silica aerogel. The method comprises the following steps: acidifying straws used as a raw material by hydrochloric acid to remove impurities, pyrolyzing the acidified straws at a high temperature, and combing a high-speed vibration ball mill with an ultrasonic dispersion process to extract biomass-based nano-silica from the raw material straws; carrying out a heating reaction on the biomass-based nano-silica and a NaOH solution, and cooling and filtering the obtained solution to obtain a biomass-based water glass solution; adding sulfuric acid to adjust the pH value to 1-2, and dropwise slowly adding the NaOH solution to make the pH value reach 7-8, carrying out continuous stirring standing, and cleaning the obtained material with deionized water to remove impurities in order to synthesize biomass-based hydrogel; exchanging the hydrogel with an anhydrous ethanol solvent; and freeze-drying the exchanged biomass-based hydrogel by using a vacuum freeze drying machine to obtain the biomass-based nano-silica aerogel. The obtained nano-silica aerogel has the advantages of high specific surface area, reasonable pore structure, low apparent density and excellent thermal performance, can be used in the fields of buildings, medicines and chemical engineering catalysis materials, and realizes waste recycling.

Description

technical field [0001] The invention relates to a method for preparing biomass-based nano-silica airgel, and belongs to the technical field of preparing nano-silica airgel materials from biomass waste. Background technique [0002] Natural biomass resources are the largest and most permanent of all material resources in terms of accumulation and production, and have been one of the main material bases for human survival and development for thousands of years. The output of agricultural residues (straw) in my country has reached 700 million t / a, and the industrial utilization rate is only about 1%. A large amount of straw is burned in the farmland, and the fire and thick smoke seriously pollute the air environment, which is even harmful to the safety of civil aviation. make an impact. It can be seen that scientific management and efficient utilization of agricultural residues are urgently needed, and making full use of biomass resources to create new high-performance biomass-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/158
CPCC01B33/1585C01P2006/10C01P2006/12C01P2006/16C01P2006/32
Inventor 杨蕊周定国连海兰梅长彤周晓燕张洋冒海燕兰平贾翀张晨李珏
Owner 林扬东方(北京)科技有限公司
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