What is ion dialysis and what is dialysis The concept of dialysis

A method of separating substances by the phenomenon of oil or other liquids precipitating from grease.

It has long been discovered that some animal membranes, such as bladder membranes and parchment paper (a kind of paper made by scraping thin sheepskin), have the effect of separating certain dissolved substances (solutes) in aqueous solutions. For example, table salt can pass through parchment paper, while sugar, starch, gum, etc. cannot. If we wrap a perforated cup in parchment paper or other semi-permeable membrane, fill the cup with salt water, and place it in a beaker with clean water, after a period of time, we will find that the water in the beaker has a salty taste, indicating that the salt molecules have entered the water through the parchment paper or semi-permeable membrane.

If you change the brine in the perforated cup to sugar water, you will find that the water in the beaker will not be sweet. Obviously, if the mixture of salt and sugar is placed in the perforated cup and the water in the beaker is constantly replaced, the salt in the mixed liquid in the perforated cup can be basically separated, so that the sugar and salt in the mixture can be separated. This method is called dialysis.

The membrane that plays the role of dialysis is called a semi-permeable membrane because it has a selective effect on the permeability of solutes. In recent years, there has been a great development of semi-permeable membranes, and many artificial films made of polymer compounds have appeared, and different films have different options for dialysis.

Principle. There are three types of dialysis that take advantage of differences in the diameter of certain solutes to separate semipermeable membranes.

Rely on the large and small "pores" in the film to separate molecules or particles of different sizes;

For example, a film made of cation exchange resin can pass through cations, which is called a cation exchange membrane, and a film made of anionic resin can pass through anions, called an anion exchange membrane;

Relying on films: selective solubility separates certain substances, such as acetate membranes, which have the ability to dissolve certain liquids and gases, and allow these substances to pass through the film. As long as a film has one of the above three functions, it can selectively allow certain substances to pass through and become a semi-permeable film.

The most commonly used semi-permeable membranes in wastewater treatment are ion exchange membranes.

Hope!!

That is, the semi-permeable membrane is used to permeability different ions.

Dialysis is based on the impermeability of colloidal particlesSemi-permeable membrane, while molecules and ions can permeate semipermeable membranes. However, colloidal particles can penetrate filter paper, so the colloidal cannot be purified with filter paper.

Explain in detail. A selective permeability method for separating particles of different solutes using semipermeable membranes. Dialysis of charged solute particles (such as ions, colloidal particles, etc.) in solution under the action of an electric field is called electrodialysis.

Electrodialysis is widely used in chemical industry, light industry, metallurgy, papermaking, seawater desalination, environmental protection and other fields; In recent years, it has been widely used in amino acids.

Protein, serum.

and other biological products purification and research.

There are many types of electrodialyzers, wThe three-chamber type of Bori is representative, and its structure is shown in the figure. The electrodialyzer is composed of three chambers: anode chamber, intermediate chamber and cathode chamber, the middle Yanshan DD is a well-sealed semi-permeable membrane, E is a sheet or rod electrode such as PT, AG, CU, etc., F is a glass tube connected to the intermediate chamber for washing, and S is a pH meter.

Electrodialysis is essentially a desalination technique.

Positive and late modes and negative ions in the electrodialyzer.

The exchange membrane is selectively permeable, and a saline solution is placed in the device and direct current.

Under the effect, positive and negative ions migrate to the cathode and anode through the membrane, respectively. Finally, in the intermediate chamber between the two membranes, the concentration of salt decreases, and the cathode and anode chambers are concentrator chambers.

Electrodialysis methods can be used for electrolytes.

solutes or certain substances for desalination, concentration, separation, or preparation of certain electrolytic products. In the application of real code auspiciousness, more than 100 pairs of exchange membranes are usually used to improve the separation efficiency. In the process of electrodialysis, factors such as ion exchange membrane permeability, ion concentration diffusion, water permeability, and polarization ionization will affect the separation efficiency.

Dialysis refers to a method of separating substances using the phenomenon of oil or other liquids precipitating from grease. It is a commonly used method of extracting and separating substances in industry and scientific research.

During dialysis, the colloidal solution is placed in a semi-permeable membrane.

The dispersion medium (usually water) of the colloidal solution can be replaced regularly inside and outside the dialyzer to achieve the purpose of digging and purifying colloids.

There are three types of osmosis:Rely on the large and small "pores" in the film to separate molecules or particles of different sizes;

The ionic structure of the film is relied on to separate ions with different properties, e.g. with cations.

The finch film made of exchange resin can pass through cations, called cation exchange membranes, and uses anions.

The film made of resin can pass through anions, which is called an anion exchange membrane;

Relying on thin films: the selective solubility of certain substances separates, such as acetic acid.

Fibrous membranes have the ability to dissolve certain liquids and gases, allowing these substances to pass through the membrane.

1. Dialysis: also known as dialysis. A membrane separation operation driven by concentration difference, which uses the selective permeability of the membrane to solutes to achieve the separation of solutes with different properties. That is, the use of semi-permeable membranes.

The process of removing small molecules or ions as impurities from the sol by the properties of small molecules and ions but not colloidal particles.

2. During dialysis, the colloidal solution is quietly placed in the dialyzer composed of semi-permeable membranes, and the dispersal medium (usually water) of the colloidal solution is regularly replaced outside the device to achieve the purpose of purifying the colloid. During dialysis, the external direct current electric field can often accelerate the diffusion of small liters of dissent ions from the inside of the membrane to the outside of the membrane, which is called electrodialysis.

electrodialysis)。

1.Dialysis: Also known as dialysis.

2.A membrane separation operation driven by concentration difference, using the selective permeability of the membrane to solutes, to achieve the separation of solutes with different properties of wide chains.

3.That is, the process of removing small molecules or ions as impurities from the sol by using the properties of semipermeable membranes that can permeate small molecules and ions, but cannot permeate colloidal particles.

4.During dialysis, the colloidal solution is placed in a dialyzer composed of a semi-permeable membrane, and the dispersion medium (usually water) of the colloidal solution is regularly replaced outside the device.

5.During dialysis, the applied direct current electric field can often accelerate the diffusion of small ions from the inside of the membrane to the outside of the membrane, which is called electrodialysis.

Dialysis principle: a membrane separation operation driven by concentration difference, using the selective permeability of the membrane to solutes to achieve the separation of solutes with different properties. That is, the process of using a semi-permeable membrane to penetrate small molecules and ions but not through the properties of colloidal particles to remove small molecules or ions as impurities from the sol.

Dialysis is the process by which solutes cross the membrane from the donor body into the recipient phase under the action of a concentration gradient.

In membrane dialysis, the number of solute molecules permeable through the membrane per unit time (flux) is related to factors such as the area and thickness of the membrane, the concentration gradient of the solute, and the diffusion coefficient, which in turn is determined by the viscosity, temperature, and pore size of the membrane. Another important factor influencing flux is the cut-off molecular weight in relation to the pore size of the membrane.