Purchase of activated carbon precautions and use knowledge

1. Activated carbon packaging is preferably sealed and packaged. Because the organic macromolecular substances are more or less permeated in the air, especially in the storage cabinets of the newly renovated shops or homes, the concentration of phenolic substances is extremely high, and these substances are absorbed by the activated carbon, which accumulates over time. The adsorption properties of activated carbon are reduced or even unusable due to the adsorption of these substances. Therefore, the more activated carbon with higher adsorption value, the more sealed packaging should be used to prevent the performance of activated carbon from being disturbed by the outside.

2. The counterfeit activated carbon that appears on the market now is pretending to be a semi-finished “carbonized material” of activated carbon. The carbonized material can only become a real activated carbon through the “activation” process, and the activation process is the most important pore structure in the activated carbon manufacturing process. the process of. The carbonized material that lacks this process can be said to have almost no adsorption performance, which is not harmful to consumers.

Since the carbonized material is not subjected to the process of activation and pore formation, the surface is smoother than the activated carbon, and the color is white, slightly metallic, and the handle is harder than the activated carbon, and the weight is also much heavier. A considerable part of the fake activated carbon is produced by inferior raw materials, diatomaceous earth, which has extremely low carbon content, and most of them are inactive substances. The carbon color is relatively white, the hand feel is very heavy, and the particle length is long. The strength is also very high, and the collision will give a crisp sound similar to that of a ceramic tap. The hand rubs the meeting and finds that there are white fine particles on the section. When buying, you must pay attention to avoid being fooled.

[Main factors affecting the adsorption of activated carbon:]

1 properties of activated carbon adsorbents

The larger the surface area, the stronger the adsorption capacity; the activated carbon is a non-polar molecule, which is easy to adsorb non-polar or low-polarity adsorbate; the size of the activated carbon adsorbent particles, the pore structure and distribution, and the surface chemistry. It also has a great influence on the adsorption.

2 properties of adsorbate

Depends on its solubility, surface free energy, polarity, size and unsaturation of adsorbate molecules, concentration of attached substances, etc.

3 wastewater PH value

Activated carbon generally has a higher adsorption rate in an acidic solution than in an alkaline solution.

The pH value affects the state and solubility of the adsorbate in water, thereby affecting the adsorption effect.

4 coexisting substances

When a plurality of adsorbates are coexisted, the adsorption capacity of activated carbon for an adsorbate is poorer than that of the adsorbate alone.

5 temperature

Temperature has little effect on the adsorption of activated carbon

6 contact time

It should be ensured that the activated carbon has a certain contact time with the adsorbate, so that the adsorption is close to equilibrium and the adsorption capacity is fully utilized.

Natural gas adsorption storage, gas-type vehicles are low-emission pollution vehicles. When using LNG as fuel, since the gas storage tank is a high-pressure container, in the event of a car accident, it is very likely that a violent explosion will cause more casualties. Developed a special special-purpose natural gas adsorption storage activated carbon product, which can reduce the pressure of the gas storage tank from several tens of MPa to about 5 MPa, which improves the safety by several hundred times; the dioxin-like gas phase pollutants Remove. Dioxins are a general term for a large class of halogen-containing organic compounds. They are newly discovered violent gas-phase carcinogens in recent years. They are produced in large quantities in the emission of flue gas from municipal waste incinerators. Activated carbon can effectively remove dioxin pollution. Things, the current application has been very extensive.

The use of powdered activated carbon for controlling mercury emissions from coal-fired power plants will be a new market growth point for activated carbon. The United States began to control and reduce mercury emissions from coal-fired power plants in 2005, becoming the first country in the world to control mercury emissions from coal-fired power plants. It is planned to reduce mercury emissions by 69% by 2018. Among the methods for controlling mercury emissions, activated carbon adsorption is one of the most economical and effective methods. It is expected that the demand for such activated carbon in the US market will reach 150,000 tons per year after 2010.

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