Abstract
The current study spotlights the modification of Anthracite (An) by microwave beam to form modified anthracite (MAn). The precursor (An) and modified anthracite (MAn) were investigated and characterized by several techniques such as XRD-EDAX, TGA, DSC, SEM, Raman spectra and BET surface area (SBET). The Mn (VII) isotherm notification was illustrated by a Langmuir model (R2 = 0.999) and the maximum monolayer coverage (QO) 555.5 mg/g that approved the surface symmetry of the modified anthracite. Whereas, The Mn (VII) kinetic knowledge was designated by the pseudo-second-order equation as specified by the high determination coefficient (R2 = 0.99342). The thermodynamic parameters (ΔH⁰, ΔS⁰, and ΔG⁰) were determined and their values indicate that the sorption of Mn (VII) on (MAn) is endothermic and spontaneous processes as well as physisorption on the surfaces of MAn. Moreover, in the dynamic mode, the adsorption capacity Ts was 58.6 mg/g or 114 mg, finally, the column recycled at least five times using H2SO4 (1 M) for each regeneration without considerable loss in sorbent mass. Therefore, MAn is estimated as a better Alternative technique for the elimination of Mn (VII) owing to a low quotation and high efficacy in this implementation.
[Display omitted]
•Utilization of microwave to valorize anthracite (An) to (MAn).•Affecting factors such as agitation time, adsorbent dose, adsorbate concentration, and agitation forth were studied.•Isothermal models were studied and interpreted.•Thermodynamic parameters were calculated and interpreted.•The proposed mechanisms were conducted.