Magnetic biochar derived from rice straw and stainless steel pickling waste liquor for highly efficient adsorption of crystal violet

Yunqiang YI, Guoquan TU, Guangguo YING, Zhanqiang FANG, Po Keung Eric TSANG

Research output: Contribution to journalArticlespeer-review

Abstract

Reducing the preparation cost of magnetic biochar is necessary for its large-scale application as an adsorbent. In this study, stainless steel pickling waste liquor and rice straw were successfully applied to synthesize of magnetic biochar (SPWL-MBC). Several iron oxides adhered on the biochar matrix, mainly Fe3O4, Fe2O3 and FeO. SPWL-MBC exhibited superparamagnetism, and its specific surface area was 274.29 m2/g. The material was able to adsorb a model contaminant, crystal violet (CV), with a maximum adsorption capacity of approximately 111.48 mg/g. Adsorption mechanism analysis showed that iron oxides, π-π interaction, hydrogen bonding and electrostatic interaction were responsible for the adsorption of CV. The CV adsorption efficiency of SPWL-MBC remained 71.91% after three adsorption-regeneration cycles. These outcomes illustrate that the magnetic biochar prepared from stainless steel pickling waste liquor can effectively remove CV from wastewater. Copyright © 2021 Elsevier Ltd. All rights reserved.

Original languageEnglish
Article number125743
JournalBioresource Technology
Volume341
Early online dateAug 2021
DOIs
Publication statusE-pub ahead of print - Aug 2021

Citation

Yi, Y., Tu, G., Ying, G., Fang, Z., & Tsang, E. P. (2021). Magnetic biochar derived from rice straw and stainless steel pickling waste liquor for highly efficient adsorption of crystal violet. Bioresource Technology, 341. Retrieved from https://doi.org/10.1016/j.biortech.2021.125743

Keywords

  • Magnetic biochar
  • Stainless steel pickling waste liquor
  • Adsorption
  • Crystal violet

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