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Preparation method of super-hydrophobic active carbon

A super-hydrophobic and activated carbon technology, which is applied in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of general effect, limited use, and inability to connect to super-hydrophobic properties, and achieve methyl The effect of large quantity and strong anti-destructive ability

Inactive Publication Date: 2015-02-25
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The activated carbon obtained by the above method only has ordinary hydrophobicity, but cannot be superhydrophobic.
In recent years, silane has also been used to improve the hydrophobicity of solid substances, but the hydrophobicity of activated carbon modified by silane alone is difficult to directly form chemical bonds with silane because activated carbon is an inert substance. Therefore, the effect after modification is general, which limits its application. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The invention discloses a preparation method of super-hydrophobic activated carbon. The raw materials used include activated carbon, concentrated nitric acid as an oxidizing agent and trimethylchlorosilane as a modifying agent.

[0019] The preparation method of above-mentioned superhydrophobic gac is:

[0020] (1) Oxidative modification of activated carbon:

[0021] Pretreat the powdery, coal-based activated carbon of Ningxia Coal Group (Shenhua Ningxia Coal Industry Group Co., Ltd.) Dawukou Coal Washing Plant, that is, heat the activated carbon at 120°C for 5 hours; 10g was added to concentrated nitric acid (69% mass fraction) and stirred for 0.5 hours, the temperature was controlled at 25°C, and the stirring rate was 300rpm·min-1, and then the solid was obtained by centrifugation, and the solid was vacuum-dried at 80°C for 6 hours to obtain the oxidative modification. Activated carbon after neutralization.

[0022] (2) Preparation of superhydrophobic activated carb...

Embodiment 2

[0027] Adopt the method for embodiment 1 to obtain superhydrophobic activated carbon.

[0028] According to the amount of 10g / L, superhydrophobic activated carbon was added to water, stirred at 25°C for 1, 2, 3, and 4 hours, respectively, and then filtered to obtain solids, which were vacuum-dried at 88°C for 5 hours, and then measured Solid contact angles are 125°, 119°, 90° and water absorption respectively.

Embodiment 3

[0030] Adopt the method for embodiment 1 to obtain superhydrophobic activated carbon.

[0031] According to the amount of 10g / L, superhydrophobic activated carbon was added to acetic acid, stirred at 25°C for 1, 2, 3, and 4 hours, respectively, and then the solids were obtained by suction filtration, and the solids were vacuum-dried at 100°C for 3 hours, and then The solid contact angles were measured and were 133°, 131°, 130° and 115°, respectively.

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Abstract

The invention relates to a preparation method of super-hydrophobic active carbon. The preparation method is characterized by comprising the following steps: (1) oxidation modification of active carbon: firstly heating active carbon at 120 DEG C for 5h, adding the active carbon according to the dosage of 10g / 0.03L into concentrated nitric acid, stirring and mixing for 0.5h while controlling the temperature at 25 DEG C, carrying out centrifugal separation to obtain a solid, and carrying out vacuum drying on the solid to obtain the active carbon which has undergone oxidation modification; and (2) preparation of the super-hydrophobic active carbon: adding the active carbon according to the dosage of 10g / L into trimethylchlorosilane, stirring and heating at 40 DEG C for 8h, carrying out suction filtration to obtain a solid, and carrying out vacuum drying on the solid so as to obtain the super-hydrophobic active carbon. According to the invention, methyl is grafted on the active carbon by a mode of forming chemical bonds. Thus, the super-hydrophobic active carbon has advantages of large quantity of methyl groups on the active carbon and strong tamper-resistant capability.

Description

technical field [0001] The invention relates to a preparation method of superhydrophobic activated carbon. Background technique [0002] Activated carbon has the advantages of rich inner pores, large specific surface area, acid and alkali resistance, good thermal stability, and easy regeneration. It is an excellent adsorbent and can be used for air purification and wastewater treatment. (Wu Jintao, Zhou Jianbin. Activated carbon air purification technology Development Overview. Forestry Industry, 2011, 6: 58-59) (Jiang Yanxin, Huang Xiang, Jiang Wenju. Research and Application Progress of Activated Carbon Treatment of Heavy Metal Wastewater. Anhui Agricultural Sciences, 2012, 40(7): 4156-4158) (Liang Xia , Wang Xuejiang. Activated carbon modification method and its application in water treatment. Water Treatment Technology, 2011, 37 (8): 1-6) and as a catalyst carrier (Xiao Suping, Xiang Yun, Chen Lin, etc. Activated carbon loaded TiO2 Research progress of photocatalysts. S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30
Inventor 袁红刘海
Owner BEIFANG UNIV OF NATITIES
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