To solve the problem, we need to identify the term that does not relate to adsorption from the given options. Here's a breakdown of each term:
- Adsorbent: A material that has the ability to adsorb another substance onto its surface.
- Effluent: Waste or by-products discharged to the environment, often through industrial or sewage processes. It does not directly relate to the process of adsorption.
- Adsorbate: The substance that gets adsorbed onto the surface of the adsorbent.
- Desorption: The process by which an adsorbed substance is released from or through a surface, the opposite of adsorption.
Considering the definitions, the term Effluent is not directly related to the process of adsorption; hence, it is the correct answer.