Adsorption desorption, what is the principle of adsorption?

Activated carbon has a well-developed pore structure, and the adsorbed molecules enter the adsorption pores through the macropores (R 50nm) and mesopores (2nm R 50nm) through the two transportation channels Micropores (R 2nm), and the molecules and surface groups on the pore surface are combined together by van der Waals force to complete adsorption. Founded in 1996, Nanjing Mulinsen Carbon Industry Co., Ltd. is a professional activated carbon production enterprise integrating scientific research, development, production and sales. Over the past 20 years, the company has been focusing on the production of activated carbon, and has now developed into a subsidiary of Nanjing Mulinsen (deep processing base, mainly producing high-end products such as high-grade pure activated carbon and activated carbon catalysts), Hainan Mulinsen (Southeast Asia coconut shell raw material base, mainly producing coconut shell activated carbon), Gansu Mulinsen (Northwest coconut...).

Adsorption is the phenomenon of adsorption of gases or solutes on the surface of a solid or liquid. When the system reaches equilibrium after a long period of sufficient contact between the liquid or gas mixture and the adsorbent, the equilibrium adsorption capacity of the adsorbate (the adsorption mass adsorbed by a unit mass of adsorbent when the adsorption equilibrium is reached) depends first on the chemical composition and physical structure of the adsorbent, and is related to the temperature and pressure of the system and the concentration or partial pressure of this and other components.

Adsorption separation is the method of using certain porous solids to selectively adsorb one or several components in a fluid, so that the mixture is separated is called adsorption operation, which is one of the important unit operations for separating and purifying gas and liquid mixtures.

Physical adsorption refers to the adsorption between the adsorbent and the adsorbate through the intermolecular attraction (i.e., van der Waals force), the substance does not change the original properties in the adsorption process, so the adsorption energy is small, and the adsorbed substance is easy to detach again, such as adsorption gas with activated carbon, as long as the temperature is raised, the adsorbed gas can be driven out of the surface of the activated carbon.

Chemical adsorption, refers to the chemical reaction between the adsorbent and the adsorbate, the formation of chemical bonds caused by adsorption, in the adsorption process not only has gravity, but also the force of chemical bonds, so the adsorption energy is larger, to expel the adsorbed substance needs a higher temperature, and the adsorbed substance even if it is expelled, has produced chemical changes, is no longer the original substance, the general catalyst is to work in this adsorption mode.

There is also a kind of molecular sieve that can be operated continuously, the material continuously enters the packed bed, the molecular sieve can only adsorb a fixed volume of molecules, and then release, and block the molecules that are too large, and the separation of petroleum gas and natural gas is often used in this way.

Physical adsorption and chemical adsorption do not occur in isolation and often occur together. In wastewater treatment technology, most of the adsorption is often the result of the combined action of several adsorptions. Due to the influence of adsorbents, adsorbents and other factors, it may be that some kind of adsorption plays a dominant role.

Adsorption is an essential unit operation in industrial applications such as catalysis, decolorization, deodorization, and anti-poisoning.

In terms of adsorption applications, it is usually used in the conduct of catalytic chemical reactions, and the amount of catalysts used in industry is very large, mostly in tons!

The solid surface has the ability to adsorb dissolved and colloidal substances in water, and activated carbon with a large specific surface area has a high adsorption capacity and can be used as an adsorbent. Adsorption can be divided into physical adsorption and chemical adsorption. If the adsorption between the adsorbent and the adsorbed substance is generated by intermolecular attraction (i.e., van der Waals force), it is called physical adsorption; If there is a chemical reaction between the adsorbent and the adsorbed substance, a chemical bond is formed to cause adsorption, which is called chemical adsorption.

Ion exchange is actually also a type of adsorption which will be discussed in the second section. Physical adsorption and chemisorption are not incompatible and can occur with changing conditions, but in a system, one may be the primary one. In sewage treatment, in most cases, it is often the result of a combination of several adsorptions.

The amount of a substance adsorbed by a given adsorbent is related to the nature of the substance, its concentration and temperature. The formula that indicates the relationship between the amount and concentration of the adsorbed is called the adsorption isotherm. There are two formulas commonly used at present:

Freundlich adsorption isotherm, Langrnuir adsorption isotherm.

Adsorption refers to the action of various gases, vapors and solutes in solution being adsorbed on the surface of solid or liquid substances.

Adsorption is the attachment of atoms, ions or molecules of a gas, liquid, or dissolved solid to a surface. This process results in a membrane made up of adsorbents on the surface. Adsorption is different from absorption, which is the process of immersion or dissolution of a liquid as an adsorbate into another liquid or solid.

Adsorption is confined to the solid surface, whereas absorption acts on both the surface and the interior.

When a fluid comes into contact with a porous solid, one or more components in the fluid accumulate on the surface of the solid, a phenomenon called adsorption. Adsorption also refers to the phenomenon in which the surface of a substance (mainly a solid substance) absorbs molecules or ions from the surrounding medium (liquid or gas). A phenomenon in which a layer of atoms or molecules is formed on the surface of a liquid or gas.

The adsorbed atoms or molecules are often firmly attracted by chemical bonds, i.e., chemical adsorption. In chemical adsorption, the adsorbed layer is often a thin layer of collapsed locust as thick as a molecule. Adsorption can also occur through weaker physical forces, known as physical adsorption, usually forming several molecular layers.

Adsorption belongs to a mass transfer process, the molecules inside the substance and the surrounding molecules have a gravitational attraction to each other, but the molecules on the surface of the substance, in which the force of the relative material outside the group is not fully exerted, so the surface of the liquid or solid substance can adsorb other liquids or gases, especially in the case of a large surface area, this adsorption force can produce a great effect, so the industry often uses a large area of substances for adsorption, such as activated carbon, water film, etc.

Adsorption principle: When the fluid is in contact with solid particles, especially some porous particles, a certain component or some components in the fluid are enriched on the solid particles.

In water treatment, the adsorption of substances in water on the surface of solid substances is mainly used. The adsorption method in sewage treatment is a method that uses porous solid substances to adsorb one or more substances in the water on the solid surface and remove them. The adsorption method can effectively complete a variety of purification functions of water, such as decolorization, deodorization, removal of heavy metal ions, various dissolved organic substances, radioactive elements, etc., to achieve the purpose of wastewater purification.

This process is mainly used for the treatment of low-concentration industrial wastewater.

Porous solid substances with certain selective adsorption function are called adsorbents, such as activated carbon, adsorption resin, zeolite, alumina, silica gel, activated clay, etc., among which activated carbon is the most common. The substances that are adsorbed in wastewater are called adsorbents.

The adsorption force on the surface of an adsorbent can be divided into three types, namely intermolecular gravitational force (van der Waals force), chemical bonding force, and electrostatic attraction. According to the different adsorption forces of solid surfaces, there are three types of adsorption forces.

1) Physical adsorption.

2) Chemical adsorption.

3) Ion exchange adsorption.

It means that the ions of a substance are concentrated on the charged points on the surface of the adsorbent due to electrostatic attraction, and at the same time, other ions originally fixed on these charged points on the surface of the adsorbent are replaced, which is equivalent to an equivalent ion released on the surface of the adsorbent.

When the system reaches equilibrium after a long period of sufficient contact between the liquid or gas mixture and the adsorbent, the equilibrium adsorption capacity of the adsorbate (the adsorption mass adsorbed by a unit mass of adsorbent when the adsorption equilibrium is reached) depends first on the chemical composition and physical structure of the adsorbent, and is related to the temperature and pressure of the system and the concentration or partial pressure of this and other components.

For mixtures containing only one type of adsorbate, the graph of the equilibrium adsorption amount of the adsorbate at a certain temperature as a function of its concentration or partial pressure is called the adsorption isotherm. For gas mixtures with low pressure, the inert components have little effect on the adsorption isotherms. The solvent of the liquid mixture usually has an effect on the adsorption isotherms.

The adsorption isotherms of the same system change with temperature. The higher the temperature, the smaller the equilibrium adsorption capacity. When the mixture contains several adsorbents, the equilibrium adsorption capacity of each component is different, and the ratio of the concentration of each component to be adsorbed is generally different from the composition of the original mixture, that is, the separation factor is not equal to 1.

The better the selectivity of the adsorbent, the more conducive to adsorption separation.

Adsorption principle: adsorption is a relatively common BAI principle.

Suck the phenomenon zhi, and it's a dao

A specific phenomenon of suction gyrus. Absorption is a phenomenon in which a component of one phase is absorbed by another phase called an absorbent, which usually has a large surface area.

Adsorption belongs to a kind of mass transfer process, the molecules inside the substance and the surrounding molecules have a gravitational attraction to each other, but the molecules on the surface of the substance, in which the force relative to the outside of the substance is not fully exerted, so the surface of the liquid or solid substance can adsorb other liquids or gases, especially in the case of a large surface area, this adsorption force can have a great effect.

Explanation of adsorption.

adsorption]

The phenomenon of adsorption of matter. The physical or chemical force of a gas, dissolved substance, or liquid molecule is pulled or attracted by the surface of a solid or liquid that comes into contact with it Detailed explanation (1).Attract attachment.

Cheng Wenguang, "Night Fisherman": The fishing boats shook horribly, but the soles of their feet were clinging to the sticky, slippery, steep deck as if they had been hammered into nails. ” 2).

The phenomenon of adsorption of matter. Solids absorb certain substances from the solution, gas or liquid from the gas, so that these substances adhere to their own surface, such as activated carbon adsorbs impurities in toxic gases and liquids.

Word decomposition Explanation of inhalation Inhalation ī Introduce qi into the body from the mouth or nose: breathing. Inhale.

Smoking. Attract: Attract.

Adsorption. Call radical: mouth; Explanation of attached attached ù additionally added, with:

Possessed. Annex. Incidental (a additional; b non-primary).

Vassals. Attachment (a reluctantly pulling together unrelated matters, such as "far-fetched"; b. Organize creative activities such as articles, layout plots, and rhetoric of destiny, such as "Thoughts and Attachments, 10.

1. Adsorption: When the fluid is in contact with a porous solid, one or more components in the fluid accumulate in the simple place on the solid surface, which is called adsorption.

2. Adsorption also refers to the phenomenon that substances (mainly solid substances) surface touch the surface to absorb the molecules or ions in the surrounding medium (liquid or gas).

3. Adsorption belongs to a mass transfer process, the molecules inside the substance and the surrounding molecules have the gravitational force of sucking each other, but the molecules on the surface of the substance, the external force of the relative substance is not fully exerted, so the surface of the liquid or solid substance can adsorb other liquids or gases, especially in the case of a large surface area, this adsorption force can have a great effect, so the industry often uses a large area of substances for adsorption, such as activated carbon, water film, etc.