Adsorption and regeneration on iron-activated biochar for removal of microcystin-LR

Novel iron activated biochars (FA-BCs) were prepared via simultaneous pyrolysis and activation of FeCl3-pretreated bermudagrass (BG) for removing microcystin-LR (MC-LR) in aqueous solution. Compared to the raw BC (without activation), surface area adsorption capacity FA-BC at impregnation ratio 2 (2 g FeCl3/g BG) enhanced from 86 m2/g 0.76 mg/g 835 9.00 mg/g. Moreover, possessed various oxides its which provided catalytic regeneration MC-LR spent magnetic separation after adsorption. Possible mechanisms onto would include electrostatic attraction, ?+-?, hydrogen bond, hydrophobic interactions. The detailed studies indicated mainly chemisorption intra-particle diffusion limitation participate process. thermal 300 °C kept high efficiency (99–100%) during four cycles adsorption-regeneration. In addition, (close 100%) was also achieved by persulfate oxidation-driven regeneration. exhibited real lake water meet concentration below 1 ?g/L as a safe guideline suggested WHO.