Adsorption of Amoxillin Drug onto Activated Carbon Prepared from Cashew Nut shell by H۳PO۴ Activation: Studies on Equilibrium Isotherm by Nonlinear Equations

Activated carbon (AC) as a source of normal plants (Cashew Nut Shell) were utilizing as the best, ecological and cost-effective adsorbent for removal of contaminants of Amoxillin (AMX) drug from aqueous solutions via sonicated. Adsorption thermodynamics and equilibrium isotherm of AMX drug onto AC-CNS. The data indicate that AC-CNS can be used as a low-cost substitute compared with commercial adsorbents removal of pollutants from aqueous solution. The effects of pH solution (۲-۱۰), initial concentration of AMX (۱۰-۱۰۰ mg/L), solution temperature (۱۵-۳۵ °C) and adsorbent dosage (۰.۰۱-۰.۱ g) on adsorption were evaluated. The structural and morphological properties of the AC-CNS were analyzed including FESEM, TEM and EDX. The non-linear model was conducted to determine thermodynamic parameters and equilibrium isotherms, where the result of equilibrium isotherm was fitted onto the Freundlich model. Freundlich suggested a determined multilayer adsorption efficiency (۱۰۹.۶۶ mg/g). The nonlinear models of thermodynamic factors appear to show that the adsorption was spontaneous (negative value of ∆G and positive value of ∆S) and endothermic (positive value of ∆H) at the same optimum conditions.

کلیدواژه ها:

Nonlinear Model ، Thermodynamic ، equilibrium isotherm ، Drug ، Cashew Nut Shell