Activated carbon desorption method
Temperature desorption
The amount of adsorption of the substance decreases as the temperature increases, and the temperature of the adsorbent rises to desorb the adsorbed components. This method is also called
For temperature desorption, the temperature during the whole process is cyclically changed. Microwave desorption is a technology improved by temperature desorption, and microwave desorption technology has been applied.
Gas separation, drying and air purification and wastewater treatment. In practice, this method is also the most commonly used method of desorption.
Decompression decompression
The amount of adsorption of the substance increases as the pressure increases. Adsorption at a higher pressure, lowering the pressure or drawing a vacuum can regenerate the adsorbent.
The method is also known as pressure swing adsorption. This method is often used for gas desorption.
Flushing and detaching
The adsorbent is washed with a gas (liquid) that is not adsorbed, and the adsorbed component is desorbed. In this way, it is inevitable that the rinsing agent is mixed with the adsorbed component.
The problem needs to be separated by other methods, so this method has the inconvenience of multiple separations.
Displacement desorption
Displacement desorption works by replacing the absorbed component with a substance that is more viscous than the adsorbed component. The consequence is that the adsorbent is adsorbed again.
The substances that have been replaced must be separated by other means. For example, activated carbon has a certain adsorption capacity for Ca2+ and C1-, and these ions occupy the absorption.
With an active center, it can adversely affect the adsorption of inorganic substances or organic substances on activated carbon. Therefore, after adsorbing the substance in the solution to be separated with activated carbon,
The use of CaCl2 as a desorbent can reduce the adsorption stability of the activated carbon on the adsorbate, thereby achieving the purpose of reducing the desorption activation energy.
Magnetization desorption
Since the properties of the single molecule water are much more active than the water molecules in the cluster, its dipole characteristics can be sufficiently exhibited, thereby increasing the polarity of the water. Pre-magnetic processing
The polarity of the water can be increased, which fully explains the decrease in the adsorption capacity of the activated carbon after the pre-magnetic treatment. When the magnetic field strength increases, the separated
The more individual water molecules, the greater the hindrance effect, and the more the adsorption capacity is reduced. Activated carbon itself is a non-polar substance, the surface of activated carbon
It has an oxidizing substance due to activation, and the adsorbent is activated under humid air conditions, which makes the surface oxidizing substance of the activated carbon dominate with an acidic oxide, thereby making the activated carbon have polarity and capable of adsorbing a substance having a relatively strong polarity. . Because these polar groups tend to adsorb polar water,
The adsorption of the non-polar substance in the aqueous solution is hindered by the adsorbent. This method is commonly used for the desorption of adsorbates in solution.
Ultrasonic desorption
Ultrasonic (field) is a synergistic effect to change the equilibrium relationship of the adsorption phase. After adding the third component to the adsorption system under the action of ultrasonic (field), the body
The degree of phase equilibrium shifts toward the direction of solid phase adsorption reduction more than that under conventional conditions. According to the principle of action of ultrasound, it can be
It can be because the third component changes the polarity of the fluid phase, increases the surface tension of the cavitation nucleus, and causes the tiny gas core to be compressed to cause a collapse and closure cycle.
Shortening phenomenon, resulting in more intense ultrasonic cavitation. Therefore, after adsorbing the substance in the solution to be separated with activated carbon, ultrasonic (field) can be used.
A synergistic effect is generated to change the equilibrium relationship of the adsorption phase, and the adsorption stability of the activated carbon to the adsorbate is reduced, thereby achieving the purpose of reducing the desorption energy.
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