Comparative efficiency of peanut shell and peanut shell biochar for removal of arsenic from water

摘要: Contamination of surface water and groundwater streams with carcinogenic chemicals such as arsenic (As) has been a major environmental issue worldwide, requires significant attention to develop new low-cost sorbents treat As-polluted water. In the current study, arsenite (As(III)) arsenate (As(V)) removal efficiency peanut shell biochar (PSB) was compared (PS) in aqueous solutions. Sorption experiments showed that PSB possessed relatively higher As than PS, 95% As(III) (at pH 7.2) 99% As(V) 6.2) 0.6 g L−1 sorbent dose, 5 mg initial concentration, 2 h equilibrium time. Experimental data followed pseudo-second-order model for sorption kinetics showing dominance chemical interactions (surface complexation) between functional groups. The Langmuir isotherm indicated sorbed via monolayer process. X-ray photoelectron spectroscopy (XPS) Fourier transform infrared (FTIR) analyses revealed hydroxyl (–OH) aromatic (C=O, C=C–C, –C–H) groups contributed significantly both species from solutions through complexation and/or electrostatic reactions. We demonstrate pyrolysis abandoned PS yields novel, low-cost, efficient which provides dual benefits As-rich treatment value-added sustainable strategy solid waste disposal.