Preparation of Al-loaded magnetic Chinese medicine residue-derived biochar and application of it in fluoride removal
2022
Tie, Jingxi | Sang, Shuo | Shang, Zhenya | Li, Yingqi | Xu, Zhitao | Lian, Molin | Du, Chunbao
The development and application of new materials for the extreme fluoride pollution problem has drawn increasingly wide attention. Here, Chinese medicine residue, FeSO₄.7 H₂O, FeCl₃.6 H₂O and Al(NO₃)₃ were used as raw materials to create an novel Al-loaded magnetic Chinese medicine residue-derived biochar (Al/Fe₃O₄/CMRB) adsorbent for effective fluoride adsorption. Al/Fe₃O₄/CMRB was characterized and used to conduct fluoride adsorption. In the pH range of 4–11, the fluoride adsorption reduced from 37.38 mg/g to 15.84 mg/g. The pseudo-second-order equation and Freundlich equation was the ideal model to describe the adsorption. The thermodynamic study confirmed the spontaneous and exothermic nature of fluoride adsorption by Al/Fe₃O₄/CMRB. Chloridion, nitrate, and sulfate had no influence on fluoride adsorption when a single anion and all three anions were present. phosphate created a more significant reduction of fluoride adsorption with rising concentrations, whether or not the other three anions were present. Al/Fe₃O₄/CMRB was an potential composite for aqueous fluoride removal. In addition, Al/Fe₃O₄/CMRB showed high separation efficiency in a contactless magnetic field, which demonstrated its potential use for large-scale applications in real samples.
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