Wet-Process-Modified Blue-Green Algae Biochar by K2FeO4 for the Efficient Adsorption of Cr(VI) from Water

Iron-modified biochar adsorbent shows its promise for removing Cr(VI) from water. However, the traditional dry-grinding modification methods to prepare iron-modified (DFeBC) usually result in aggregation of iron oxide particles, thus impeding adsorption capacity. Herein, blue-green algae waste derived modified a wet process by K2FeO4 (WFeBC) was developed, and it showed well-distributed on surface biochar. As result, WFeBC displayed larger theoretical capacity 66.22 mg/g than that DFeBC (48.54 mg/g). It found uniform-distributed abundant oxygen functional groups played an important role removal Cr(VI). In process, reduction Cr(III) Fe(II) promoted hexavalent chromium. The will be attracted protonated through electrostatic interaction complexation acid environment. All results show can effectively improve ability