Journal
BIORESOURCE TECHNOLOGY
Volume 341, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125743
Keywords
Magnetic biochar; Stainless steel pickling waste liquor; Adsorption; Crystal violet
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The study successfully synthesized magnetic biochar from stainless steel pickling waste liquor and rice straw, with high specific surface area and adsorption capacity for crystal violet. The material exhibited good adsorption efficiency and maintained high performance even after multiple adsorption-regeneration cycles.
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. SPWLMBC exhibited superparamagnetism, and its specific surface area was 274.29 m(2)/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, pi-pi 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.
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