As far as I understood, your question is related to adsorption process of dye on some nanoparticles. Adsorption can be categorized into two types: (i) physical and (ii) chemical. Conventionally the test for clarifying the type of adsorption is performed by changing temperature. If the adsorption increases with increasing temperature then the type of adsorption is chemical adsorption, i.e., chemisorption, otherwise physical adsorption. Your case is physical adsorption or physisorption.
due to when temperature increase inhibition efficiency decrease and then inhibitors escape from the surface and adsorption process becomes un favorable in presence of high temperature and then called desorption process
As the temperature increases, the kinetic energy (vibrational energy in particular) of any particle increases, reaching a threshold where that energy overcomes the adsorption bonding energy.
Dye is and organic compound and the color is observed due to the electronic transition between different energy levels , and energy is directly related with the temperature. if we increases the temperature the energy levels also increses, by which the transition difficult between different energy levels and the nature of dye slowly slowly destroyed, so the percentage of dye removal decreses on increasing temperature.
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