Removal Phenol from Aqueous Solutions Using Environmental friendly and Effective Adsorbent onto Mn–Fe2O4–NPs–AC

Abstract

The applicability of Mn–Fe2O4–NPs–AC for removing Phenol from aqueous solutions has been reported. This novel material was characterized by different techniques such as FT-IR, XRD and SEM. The influence of nanoparticle dosage, pH of the sample solution, individual Phenol concentration, contact time between the sample and the adsorbent, temperature, and ionic strength of the sample solution were studied by performing a batch adsorption technique. The maximum removal of 5-25 mg L-1 of individual Phenol from an aqueous sample solution at pH 6.0 for Phenol was achieved within 30 min when an adsorbent amount of 0.1 g was used. Regarding the Kinetic models both pseudo-first-order and pseudo-second-order diffusion models of Phenol revealed that the kinetic of adsorption process followed second-order equation model. After using various Isotherm models to fit the experimental equilibrium data with, the adequacy and applicability of Langmuir model has been proven. The adsorption data ftted well with the Langmuir isotherm model with correlation coefcient (R2 > 0.995), The maximum adsorption capacity of the Phenol removal onto Mn–Fe2O4–NPs–AC was roughly 4.27 mg/g, respectively. Thermodynamic parameters of free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) of adsorption were determined using isotherms. ΔH0= -4.947 kj/mol, ΔG0= -3.937 kj/mol and ΔS0= -1.521 kj/mol.K. The fact that the sorption process was endothermic was well reflected by the negative value of (ΔGo, ΔHo and ΔSo) which on its own expressed the affinity of Mn–Fe2O4–NPs–AC to wards Phenol. These results indicate that the pretreatment of Mn–Fe2O4–NPs–AC can optimize the removal of Phenol from aqueous solution.