A novel approach for preparation of modified-biochar derived from marine macroalgae: Dual purpose electro-modification for improvement of surface area and metal impregnation

Abstract

In the present study, an aluminum electrode-based electrochemical process was newly adopted as a modification method for fabricating physically and chemically modified biochar derived from marine macroalgae. Specifically, a current density of 93.96mAcm−2 was applied for 5min at pH 3.0. Subsequently, the mixture was stirred continuously for 30min without electric field, and the dried sample was then pyrolyzed at 450°C under a N2 environment for 2h. SEM–EDS and XRD analyses clearly indicated that nano-sized aluminum crystals (beohemite, AlOOH) were uniformly present on the EM-biochar surface. Adsorption equilibrium tests showed that the phosphate adsorption onto EM-biochar agreed well with the Langmuir–Freundlich adsorption isotherm model, with a maximum adsorption capacity of 31.28mg-Pg−1. These findings suggest that this novel and simple electro-modification method is a reasonable and effective option for simultaneously upgrading both the surface area and chemical properties of biochar.