adsorption of amoxillin drug onto activated carbon prepared from cashew nut shell by h3po4 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 (2-10), initial concentration of amx (10- 100 mg/l), solution temperature (15-35°c) and adsorbent dosage (0.01-0.1 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 (109.66 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.