ABSTRACT
A novel Mn-Al-Fe impregnated RGO (Mn-RGO) hybrid adsorbent is synthesized, and verified for possible arsenic (As(III), As(V)) remediation, and mitigation. A maximum arsenic adsorption loading ability is observed around 402, and 339 mg g−1 for As(III), and As(V), respectively (C i ~ 0.1 – 100 mg/L). Adsorption isotherms experiments are observed with Freundlich isotherm plot-based multilayer sorption. The kinetics study on arsenic adsorption [combined As(III), and As(V)) in competing for ion environment] also confirmed a better removal ability. The influence of solar irradiation onto adsorption kinetics is verified with in-situ photo-current response experiments. The photo-catalytic activity (PCA), and photocatalytic oxidation (PCO) of Mn-RGO is understood in terms of zero-bias photo-current of 17 μA. XPS study on As 3d, and detailed analysis onto individual metal elements (Mn 2p, Fe 2p, Al 2p), functional groups (O 1s, C 1s) supports redox, and surface ligand exchange phenomenon.
