Interpretation of diclofenac adsorption onto ZnFe2O4/chitosan magnetic composite via BET modified model by using statistical physics formalism

oxide dispersion onto chitosan (ZnFe2O4/CMC). The adsorption isotherms at four temperatures (298, 308,318
and 328 K) and pH = 3 are interpreted in the light of an adsorption model derived from the statistical physics
formalism, which includes the calculation of physicochemical parameterswith defined physicalmeaning. Specifically,
the adsorption process is interpreted in light of the number of DCFmolecules adsorbed per site (n), which
increaseswith temperature, and the density of receptor sites (NM),which shows a similar trend. The values of the
calculated adsorption energy (ΔE1 and ΔE2) confirmed that the interaction between the DCF molecules and
ZnFe2O4/CMC takes place via physical forces. Overall, the hydrogen bonds are identified as the main bonding interactions
of DCF molecules on the ZnFe2O4/CMC surface. Interestingly, thermodynamic potential functions are
determined for a complete adsorption characterization, which included also the adsorption energy distribution
(AED) determination of DCF adsorption onto the ZnFe2O4/CMC.