Thermodynamic studies were done at temperatures from 25 to 65 °C in 60 min. The effect of temperature on the adsorption process is presented in Fig. S8, Supplementary Information. According to the results, as the temperature increased the adsorption efficiency decreased. This shows that the adsorption process at temperatures higher than 25 °C was exothermic. Also, the results from thermodynamic studies are shown in Table 4. As represented in the table, the negative value for enthalpy approves the exothermicity of the process. Moreover, the low value of entropy (40 kJ/mol) indicates the physical adsorption of AMX on the AC (Zuim et al. 2011; Rathod et al. 2015). The reaction was also spontaneous because the free Gibbs energy was negative.