Question

What do you understand by positive adsorption?

Answer 1

Positive adsorption is the phenomenon where the concentration of the adsorbate is greater at the surface of the adsorbent than in its bulk. This means the adsorbate molecules accumulate on the surface due to surface forces, increasing their concentration locally. Positive adsorption contrasts with negative adsorption, where the adsorbate concentration is lower at the surface compared to the bulk. This process is a surface phenomenon essential in various applications like catalysis and purification.