The adsorption process of activated carbon in electric heating tubes is exothermic

The adsorption process of activated carbon in electric heating tubes is exothermic

Developing various activated carbons with selective adsorption of brightener decomposition products for various brighteners is a practical task that should be taken seriously by relevant departments. This can reduce the loss of effective ingredients in the plating solution during treatment and improve the treatment effect.

Activated carbon is a solid adsorbent that has a certain adsorption capacity for both gaseous liquids and solid particles (adsorbates). While the adsorbate is adsorbed by activated carbon, there is also a reverse process of adsorbate detachment from the surface of activated carbon - desorption, where adsorption and desorption occur almost simultaneously. When the adsorption point on the surface of activated carbon is completely occupied by the adsorbate, it reaches adsorption saturation. At this point, the adsorption and desorption rates are equal, reaching dynamic equilibrium. After the adsorption reaches saturation, even if the adsorption time is extended, the adsorption amount cannot be increased anymore.

The adsorption process of activated carbon is exothermic. It should be said that at low temperatures, activated carbon adsorbs a large amount of impurities. However, in the general treatment of electroplating solutions, heating is often used to make activated carbon easy to wet and disperse. In fact, in general, low temperatures are beneficial for adsorption, while high temperatures accelerate desorption.

When purifying the plating solution, the amount of activated carbon should be determined based on the degree of organic impurity pollution. For less organic impurities, only about 1g/L of activated carbon is needed; More organic impurities require 8g/L to 1Og/L, or even more; In general, 3g/L to 5g/L can be used for treatment.

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