Removal of Nitrate Ions Using Thermally and Chemically Modified Bioadsorbents

Nitrate ions are one of the causes surface water eutrophication. In present research, effective adsorption nitrate (NO3) on bioadsorbents prepared from yam skins (Dioscorea alata) was evaluated. The skin chemically modified with ammonium chloride (NH4Cl), and biochar thermally biomass. results were compared commercial coal (CC). characterized by SEM-EDS analysis, which showed that synthesized adsorbents have a heterogeneous pores. batch tests pH has most significant effect NO3 capacity when using (MYP), obtaining as best conditions 12 0.5 mm particle size an 25.75 mg/g; carbon (CYP) CC obtained at 2, reaching values 36 33.34 mg/g, respectively. following performance in terms found: CYP > MYP, according to Langmuir’s model. equilibrium isotherm MYP adjusted Freundlich model, while Langmuir model described CC. kinetics all systems studied good fit pseudo-first-order, pseudo-second-order Elovich models R2 0.95, suggesting mechanism chemical means species exchange between aqueous phase material, intervention intraparticle diffusion stage; based these findings, biomasses reached promising capacities removal anions, showing had remarkable behavior comparison NH4Cl-modified skins.