A kind of method for preparing superhydrophobic activated carbon

Abstract

The invention relates to a preparation method of super-hydrophobic active carbon, wherein the preparation method includes steps of adding dimethicone in heptane solvent; preparing mixed solution of which concentration is 0.5 mg / mL-2 mg / mL; adding dimethicone in the mixed solution and evenly stirring; then pouring the active carbon in above mixed solution; after fully immersing, taking out the active carbon and naturally drying; at last, placing the naturally dried active carbon under 60-200 DEG C and drying for 1-5 hours. The preparation method can improve the specific area of the active carbon; besides, the water absorbing property of the active carbon is reduced, thus the gas absorption amount is increased.

Description

technical field [0001] The invention relates to a preparation method of superhydrophobic activated carbon. Background technique [0002] Activated carbon has been widely used to remove harmful components in air, water and soil. However, in the process of use, it is found that different applications have different requirements for activated carbon. There are many occasions that require activated carbon not to absorb water, that is, to have strong hydrophobicity. However, based on the preparation method of activated carbon, almost all activated carbons are hydrophilic and absorb water without subsequent treatment. This is extremely unfavorable for the related application of activated carbon. When removing toxic gases in the air, hydrophilic activated carbon will absorb moisture in the air, and most of the limited surface area will be occupied by water molecules, which will ultimately affect the effect of activated carbon on removing toxic gases. Similarly, in wastewater tr...

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Problems solved by technology

However, the existing methods, such as using trimethylchlorosilane as a modifier (201210476531.9), and then cooperating with other solvents to modify activated carbon, this method is not environmentally friendly, because trimethylchlorosilane is a highly toxic substance and dangerous Very high, unfriendly to the environment, in addition, cost and high; another example, there is also a patent to modify activated carbon fibers by heating Dow Corning SYLGARD184 at high temperature such as 300°C (201310284996.9). Although this method is simple and easy, it requires high Temperature will virtually increase energy consumption and risk, and at the same time it is difficult to control the load of the modifier, which will affect the pore volume. In addition, the pretreatment of activated carbon fibers before modification is quite cumbersome, the process is complicated, and the cost is high; There is a patent report on the modification of activated carbon with a mixture of 8 substances such as methanol, dimethyl silicone oil, and alginic acid (201310387341.4). Although superhydrophobic is obtained, the raw material components are complicated, resulting in complicated processes and increased costs, making it difficult to commercialize. At the same time, so many modifiers will undoubtedly block the pore structure of activated carbon, thereby reducing the adsorption performance of activated carbon.

In short, the existing methods are either costly or unstable, or are not environmentally friendly, the raw material process is complicated, the adsorption performance of activated carbon is reduced, or the hydrophobicity is lost after several uses, etc.

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