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Activated carbon water filter

Currently, activated carbon is one of the materials that is no stranger to everyone. It is used in many different professions, or fields. As activated carbon masks, air purifiers use activated carbon filters, … Or the most popular is the water filter using activated carbon filter core. So how does activated carbon filter water work?

What is activated carbon?

Activated carbon in English is also known with a name Activated Carbon. This is a carbon-containing material (85-90%) that has been processed to remove the resins and create pores in their structure. Despite its low volume, small volume. But it has the ability to increase the chemical reaction area, along with an extremely good adsorption reaction.

Activated carbon is a product that is activated under the temperature from 950-1000 degrees C under anaerobic conditions. The structure of activated carbon is porous, wide, with a large surface area and low density, about 1mg of activated carbon has an area of ​​more than 500m2.
Activated carbon is made from many materials, mainly from coconut shells and bamboo, some places also made from rice husks, coal, wood, … The main effect of activated carbon is to absorb dirt, chemicals, air filter, water filter, retain many good impurities heavy metal on the surface. That is why it is widely used in life.

Activated carbon can be made from different materials

Activated carbon can be made from different materials

Difference of coal and activated carbon

Activated carbon differs from conventional charcoal in a surface area many times larger due to the structure with many pores (the surface area of ​​ordinary charcoal is only a few tens of m2/ g coal, with activated carbon is from a few hundred to thousands of m2/ g). The adsorption capacity and other specifications are also many times higher than that of conventional charcoal, so the activated carbon has outstanding technical properties that ordinary charcoal does not have.

Because in the process of producing activated carbon. Specifically, in the heat generation process, people will use heat to separate Carbon (Coal) from the original structure. And then converted to activated carbon powder. Therefore, in activated carbon will carry an empty error structure. Helps to retain and neutralize (inactivate) microscopic, ultrafine particles or dust. Therefore, the external surface area of ​​activated carbon is also very large compared to normal coal types. Should be considered as an ideal substance to filter and absorb many harmful chemicals.

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Activated carbon made from wood and coal is usually low cost. Like coir, the peel of the fruit is of higher price and quality. Waste from the activated carbon fabrication process is easily destroyed by combustion method. If the filtered substances are heavy metals, recovery, from burnt ash, is also very easy. Most activated carbon present in life is made from wood. By burning the trunk and spraying water on a burning tree trunk (this type is also known as charcoal). Or heat the wood in an anaerobic environment.

According to a study and inspection in Japan, activated carbon under an electron microscope magnified 500 times has a structure showing a very characteristic honeycomb pattern. Thanks to this structure, in 1g of activated carbon, the surface area of ​​all pores can reach 800 – 1300m2 / g. So activated carbon has very strong adsorption properties. The larger the adsorption surface. Because the smaller the particle of matter is adsorbed, the higher the adsorption capacity.

Chemically composed mainly of the element carbon in its amorphous (powder) form. One more part is in the form of graphite chips. In addition to carbon, the remainder is usually ashes, which are mainly alkali metals and sand chips). Activated carbon has a very large external surface area, so it is used as an ideal substance to filter and absorb many chemicals.

Honeycomb structure of activated carbon

Honeycomb structure of activated carbon

How does activated carbon filter water?

The current water source is seriously polluted

Currently, the world is facing a great challenge in terms of water pollution. Especially in industrial and urban zones. In big cities, the amount of untreated wastewater discharged from hundreds of industrial establishments directly into the environment is the main cause of water pollution. In rural areas, water pollution is also constantly increasing.

According to statistics, 76% of the population is living in rural areas, where the infrastructure is outdated. The majority of human and livestock wastes that are not treated should seep into the ground or be washed away causing water pollution organically and organically. microorganism higher and higher. In addition, the abuse of plant protection substances in agricultural production leads to serious pollution of water sources in rivers, lakes, canals and ditches. Directly affect the environment and human health.

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Activated carbon water filter

About 2000 years ago, people knew how to use activated carbon to remove impurities in the water, bringing clean natural water. Next, people gradually became aware of the special absorption capacity of activated carbon. However, by the early 1990s, activated carbon was produced in powder form and sold to the commercial market. At that time, people often used activated carbon to purify water.

Because activated carbon can remove trace impurities. Due to the porous structure and around the lattice of activated carbon itself there is a very strong attraction. Therefore the activated carbon has an unusual adsorption capacity. Especially for substances of organic origin, toxins, … Such as impurities in the water including pesticides, industrial wastes and chemicals. This is the reason activated carbon is widely used in water filtration systems around the world.

Water purification activated carbon is used in systems Mini water filter, mini water purifier, water purifiers, … To filter and treat domestic water and wastewater. Accordingly, processing and cleaning the environment, deodorizing, deodorizing, and other agents that have harmful effects on human health. At the same time, it is anti-pollution of the living environment, providing a clean living environment for people.

Activated carbon can remove pollutants in water sources

Activated carbon can remove pollutants in water sources

Other uses of activated carbon

In addition to using activated carbon to filter the water. Activated carbon also has many other applications in many different fields and industries. Here are some of the most common uses of activated carbon in life:

In health

Activated carbon also has a name Carbo medicinalis (pharmaceutical coal). Most of them are made of activated carbon capsules to drink with water as medicine. And is used in case of patient poisoning. Such as food poisoning, alcohol poisoning, drug overdose, diarrhea, indigestion and bloating, …

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In addition, activated carbon is also used to produce gas masks, medical masks, … To filter dirt, bacteria penetrate through the respiratory tract.

In the chemical industry

In the chemical industry, activated carbon is used as a catalyst and a loader for other catalysts …

In technical equipment

Activated carbon is a gas filtration component. Like in cigarette filters, active pads in masks, … Or deodorizing sheets in refrigerators and air conditioners …

Especially activated carbon is also used in air purification systems. Helping the air in your home space be purified. Ensure health for the whole family.


Activated carbon is used for food processing, petrochemical industry, pharmaceutical production, … Or activities of mining, agriculture, preservation, aerospace, important fields … activated carbon in very large volume.

One major industrial application is end metal treatment. It is widely used in electroplating solution refining. For example, it is the main purification technique for removing organic impurities from bright nickel plating solution. More organic matter is added to the plating solution to improve adhesion and increase properties such as brightness, smoothness, ductility, etc.

Application of activated carbon in beauty

Some cosmetic companies use activated carbon to produce beauty products. As masks, cleansers, soaps, … In order to absorb oily substances, dirt under the pores, make skin healthy. Eg:

  • Helps whiten teeth: Activated carbon will help whiten teeth while reinforcing the oral health. By changing the pH concentration in the mouth. Helps prevent tooth decay, bad breath and gum disease. Active ingredient whitens teeth by absorbing plaque and bacteria on the teeth. This whitening method is recommended by dentists because it has safe, natural ingredients. But bring high efficiency and low cost.
  • Activated carbon is very effective in treating body odor, acne, … Or relieves pain in insect bites, reduces rash, … Because activated carbon can absorb toxins from the holes. your hairy legs. So you can also mix activated carbon with masks to remove toxins from the body.
Activated carbon is widely used in beauty

Activated carbon is widely used in beauty


Activated carbon is one of the substances with a coal molecular structure. Specially treated to form materials with a special structure that can increase the contact area of ​​the coal surface. With chemical molecules in water and absorb a large amount of impurities contained inside polluted water sources. Therefore, in water purification systems, water filter activated carbon is an indispensable component.

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