Increasing Surface Functionalities of FeCl3-Modified Reed Waste Biochar for Enhanced Nitrate Adsorption Property

Ferric chloride (FeCl3) modified reed straw-based biochar was synthesized to remove nitrate from aqueous solutions and achieve waste recycling. The adsorption of onto Fe-RBC-600 adsorbents could be described by the pseudo-second-order kinetic model fitted Langmuir adsorption, maximum capacity predicted using 272.024 mg g−1. adsorbent characterization indicated that a high temperature 600 °C an oxygen-poor environment develop hydrophobic surface O-containing functional groups on biochar, which provided more binding sites for Fe3+/Fe2+ attachment increased functionality with iron oxide formation. increasing successfully enhanced property. mechanism mainly attributed physical positive sequential chemical reduction Fe2+, electrostatic protonated amine groups.