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Preparation method of super-hydrophobic active carbon modified material

A modified material and activated carbon technology, which is applied in chemical instruments and methods, and other chemical processes, can solve problems such as loss of low surface energy substances, plugging pores on the surface of activated carbon, and affecting hydrophobic performance. It achieves small consumables, easy recycling, and The effect of large pore volume

Inactive Publication Date: 2013-03-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] The invention provides a method for preparing a superhydrophobic activated carbon modified material, which aims to solve the problem of plugging pores in the current modified porous carbon material with low surface energy substances loaded on the surface of activated carbon, simple loading on activated carbon The surface is easy to cause the loss of low surface energy substances, thus affecting its hydrophobic performance

Method used

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  • Preparation method of super-hydrophobic active carbon modified material
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preparation example Construction

[0034] The concrete realization steps of this preparation method are:

[0035] Step S11, pretreating coal-based columnar and coconut shell granular activated carbon

[0036] Step S111, the specific surface area is 600-1500m 2 / g of coconut shell granular activated carbon and coal-based columnar activated carbon as raw materials, first use a sodium hydroxide solution with a concentration of 1-4mol / L to immerse and shake for 10-24 hours, and filter to obtain the filtrate;

[0037] Step S112, washing with deionized water until the filtrate is neutral, then soaking and shaking with 3.83-18.09 wt% hydrochloric acid solution for 10-24 hours, filtering, and washing with deionized water until the filtrate is neutral;

[0038] Step S113, put the sample into a beaker and add an appropriate amount of deionized water, then put it into an ultrasonic instrument with a power of 500-1000W, wash it for 30-90min, filter it and place it in a drying oven at 80-130°C for 14-20 hours;

[0039] St...

Embodiment 1

[0053] Example 1: The modified coconut shell activated carbon and coal-based activated carbon were tested for contact angle respectively. First, the activated carbon raw material and the modified preparation material were ground into powder, and then the powdered activated carbon was evenly spread on different glass surfaces. On the chip, the contact angle with water is obtained by adding water droplets, photographing, and measuring. The contact angles of coconut shell carbon materials with water before and after modification are 29.1° and 159.8°, respectively, and the contact angles of coal-based carbon materials with water before and after modification are 28.1° and 157.8°, respectively. This shows that the activated carbon modified material prepared by the present invention has superhydrophobic properties.

Embodiment 2

[0054] Example 2: The coconut shell activated carbon and coal-based activated carbon prepared by modification were tested for water absorption respectively. The conditions were to place carbon materials of equal mass before and after modification in water at 25°C at room temperature, and use the difference method to determine the water absorption. The adsorption capacity of activated carbon for water in different time periods. The experimental results show that after standing in water at 25°C for 8 hours, the relative water absorption rates of coconut shell carbon materials before and after modification are 33.08% and 92.61%, respectively, and the relative water absorption rates of coal-based carbon materials before and after modification are 31.71% and 97.35%, respectively. . The experimental results show again that the activated carbon modified material prepared by the present invention has super-hydrophobic properties.

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Abstract

The invention discloses a preparation method of a super-hydrophobic active carbon modified material. The material is prepared by applying a chemical liquid phase impregnation method, using trimethylchlorosilane as a modifier, using absolute methanol as a solvent, respectively using pre-processed coal columnar active carbon and coconut shell granulated active carbon as carriers, impregnating via liquid phase, drying in vacuum, and commonly blowing air and drying. The hydrophobic performance is respectively detected through a contact angle test and a liquid water adsorption experiment; and the adsorption is checked by using benzene adsorption experiment and an iodine value test. The invention has the advantages of simple preparation process, less material consumption and wild preparation condition; and the preparation method is carried out at room temperature. The prepared active carbon modified material has super-hydrophobic surface chemical performance and great pore volume, which makes up the shortcomings of easy absorption of moisture in the multi-pore carbon material with high humidity and small absorption capacity of the target organic matters; and the prepared active carbon modified material is easy to recycle and can be repeatedly recycled, so that the industrial cost is reduced and a foundation is further laid for the industrialized application.

Description

technical field [0001] The invention belongs to the technical field of preparation of activated carbon modified materials, in particular to a preparation method of superhydrophobic activated carbon modified materials. Background technique [0002] In recent years, the phenomenon of superhydrophobicity on the surface of plant leaves has attracted people's attention. The so-called superhydrophobic ability of plants means that the leaves of plants have significant hydrophobicity, desorption, anti-sticking, self-cleaning functions, etc. Superhydrophobicity is one of the main research contents of surface wettability. Studies have shown that the wettability of a solid surface is determined by its chemical composition and microscopic geometric structure. In addition, external fields such as light, electricity, magnetism, heat, etc. The wettability of the surface also has a great influence. Since Wenzel and Cassie published a series of invasive articles, a large number of experime...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32
Inventor 郑经堂肖慧吉郅利鹏梁鹏吴明铂薛庆忠刘倩江波闫子峰仇实卫振兴
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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