Junior Physics What is the difference between activated charcoal and alum

To put it simply, activated carbon and alum can adsorb all impurities soluble in water and insoluble in water, the difference is that the adsorption of activated carbon belongs to physical changes, and the adsorption of alum (potassium aluminum sulfate) belongs to chemical reactions, which is due to the hydrolysis reaction of aluminum ions ionized by potassium aluminum sulfate after dissolving in water and water to generate aluminum hydroxide, aluminum hydroxide can adsorb all impurities soluble in water and insoluble in water I hope mine can satisfy you

Difference Between Alum and Activated Carbon.

The main difference between alum and activated carbon is that one is chemical adsorption and the other is physical adsorption. In layman's terms, alum needs to melt in water and change to play an adsorption role, while activated carbon does not need to be dissolved or turned into another substance to have the ability to adsorption. Alum undergoes a chemical change, while activated carbon takes advantage of its physical adsorption properties according to its physical characteristics.

Moreover, alum is insoluble in water, so it cannot play the role of adsorption, but activated carbon can be used in water and air.

The principle of alum water purification.

Alum is a chemical substance that mainly works because it can ionize two metal ions when melted in water:

kal(so4)2=k++al3++2so42-

Al3+ is easily hydrolyzed to form colloidal aluminum hydroxide Al(OH)3:

Al3++3H2O = Al(OH)3 (colloid) + 3H+

The adsorption capacity of aluminum hydroxide colloids is very strong, which can adsorb impurities suspended in the water and form a precipitate to make the water clear.

The principle of the action of activated carbon.

Activated carbon is a porous carbon, mainly used to remove pollutants in water, decolorization, filtration and purification of liquids and gases, and is also used for air purification treatment, waste gas ** (such as in the chemical industry.

in the gas"Benzene"), precious metals and refining (such as the absorption of **). The principle of its action is that it is very absorbent because it is porous.

Alum is not as adsorptive as activated carbon.

In terms of its characteristics, alum mainly acts on impurities in water, and the main object is the large particle impurities in water, which accumulate and settle after hydrolysis.

There is also a certain precipitation effect; The activated and bright carbon can not only play a role on large particle impurities, but also deodorize, decolorize, etc., so in terms of use, the adsorption capacity of activated carbon is stronger.

Activated carbon and alum are two common water treatment methods, and they have some distinct differences.

First of all, activated carbon is a carbon-based material with a very high adsorption capacity. It is capable of adsorbing organic matter and certain inorganic substances in water and is used as a water treatment agent in many applications. In contrast, alum is a salt compound that is commonly used in water treatment and sewage treatment, mainly to remove suspended solids and color from water.

Secondly, activated carbon can be closed to remove impurities and spinal odors from water through physical or chemical adsorption. Adsorption refers to the removal of target molecules from water due to the chemical interaction between the surface molecules and the target molecules. Physical adsorption, on the other hand, is based on surface phenomena and removes targets from water through adsorption principles such as electrostatic adsorption, capillary action and surface tension.

Activated carbon has a strong adsorption capacity for impurities in water, which can remove impurities such as odor, color, organic matter and chlorine in water.

Finally, alum is a thousand-year-old water treatment method that is mainly used to remove suspended solids from water. It has excellent coagulation ability to form large aggregates of suspended solids in the water, which can be easily removed in subsequent steps. In addition, alum also has the ability to exchange anions, which is able to remove alkaline substances and heavy metal ions from water.

Overall, activated carbon and alum have different roles and applications in water treatment. Activated carbon is mainly used to remove impurities such as organic matter and chlorine in water, whereas alum is mainly used to remove suspended solids and color in water. In practical application, the appropriate water treatment method should be selected according to the water quality situation and the purpose of treatment.

The chemical name of alum is called potassium aluminum sulfate in the hand of dodecade water, the chemical formula is kal(SO4)2·12H2O, after potassium aluminum sulfate dodecahydrate is dissolved in water, it will decompose into potassium ions, aluminum ions and sulfate ions, kal(SO4)2 = K+ +Al3+ +2SO42-

Moreover, aluminum ions can easily form aluminum hydroxide in water, Al3+ +3H2O = Al(OH)3(colloid) + 3H+

Aluminum hydroxide is a colloid, so it can adsorb insoluble impurities in water to achieve the purpose of water purification.

Activated carbon is a porous carbon-containing substance prepared by carbonization and activation of coal, nut shells, wood and other raw materials, and has strong adsorption capacity. After the impure water enters the bottle, it is adsorbed and precipitated by the activated carbon to become pure water, which is denser than ordinary water.

The adsorption of impurities by the colloidal matter generated after alum dissolved in water is the sedimentation of impurities to achieve the purpose of purifying water. (Abbreviated as alum, the effect is to adsorb small particles and settle).

Activated carbon has a strong physical adsorption effect, which can adsorb certain organic compounds to achieve the removal effect, using this principle, we can quickly and effectively remove harmful substances in the air, odors, etc., so that the air can be directly and quickly improved. For example, Qingyi activated carbon is very good, which can effectively remove harmful gases such as formaldehyde.

Isn't it the chapter on the purification of water? The effect of alum is to adsorb fine impurities and make them settle, and activated carbon is to adsorb pigments and odors.

Alum can purify water, which will make the impurities in the water settle, and the activated carbon will adsorb.

Alum water purification is a method often used by the folk in the past, and its principle is that alum can ionize two metal ions in water:

Kal(SO4)2 = K+ +Al3+ +2SO42- while Al3+ is easily hydrolyzed to form colloidal aluminum hydroxide Al(OH)3:

Al3+ +3H2O = Al(OH)3 (colloid) + 3H+ aluminum hydroxide colloids have a strong adsorption capacity, which can adsorb impurities suspended in water and form a precipitate to make the water clear. Therefore, alum is a better water purification agent.

Activated carbon is a very fine carbon particle with a large surface area, and there are even finer pores in the carbon particle - capillaries. This capillary has a strong adsorption capacity and is in full contact with gases (impurities) due to the large surface area of the carbon particles. When these gases (impurities) touch the capillaries, they are adsorbed and purified.

Alum is precipitation, and activated carbon is adsorption.

Activated carbon is adsorption, alum is precipitated, activated carbon adsorbs impurities on the surface, if you use activated carbon, the later process has to take back the activated carbon, I don't know what the landlord is using? Drinking water is first precipitated in the first alum, and then filtered with activated carbon in the second process.