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Enhanced As(III) removal from aqueous solution by Fe-Mn-La-impregnated biochar composites

Lin, Lina ; Song, Zhengguo ; Khan, Zulqarnain Haider ; Liu, Xuewei ; Qiu, Weiwen

The Science of the total environment, 2019-10, Vol.686, p.1185-1193 [Periódico revisado por pares]

Netherlands: Elsevier B.V

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  • Título:
    Enhanced As(III) removal from aqueous solution by Fe-Mn-La-impregnated biochar composites
  • Autor: Lin, Lina ; Song, Zhengguo ; Khan, Zulqarnain Haider ; Liu, Xuewei ; Qiu, Weiwen
  • Assuntos: Adsorption ; Arsenic (As) ; Fe-Mn-La-impregnated biochar composite (FMLBC) ; Mechanism
  • É parte de: The Science of the total environment, 2019-10, Vol.686, p.1185-1193
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: A novel Fe-Mn-La-impregnated biochar composite (FMLBC) was synthesized using an impregnation method for efficient As (III) adsorption. The pseudo-second-order model (R2 values are 0.996, 0.996, and 0.994 for different FMLBC rate used) better fitted the kinetic adsorption of arsenic (As) on the FMLBC than the pseudo-first order model (R2 values are 0.978, 0.971, and 0.991 respectively). The SEM-EDS, FTIR and XPS results confirmed the addition of Fe, Mn and La into the BC structure. Compared with pristine biochar (3.73 mg g−1) and Fe-Mn-impregnated biochar (9.48 mg g−1), the As (III) adsorption capacity of Fe-Mn-La impregnated biochar (14.9 mg g−1) was significantly improved. The presence of NO3− and SO42− did not influence As adsorption, whereas PO43− influenced As removal. The mechanism of As adsorption on the FMLBC involved oxidization, electrostatic attraction, ligand exchange, and formation of an inner-sphere R-O-As complex. Among them, the electrostatic attraction and inner-sphere complexation contributed the most. The simple preparation process and high adsorption performance suggest that the FMLBC could be served as a promising adsorbent for As (III) removal from aqueous solution. [Display omitted] •Fe-Mn-La impregnated biochar (FMLBC) was prepared through an easily synthetized method.•As (III) adsorption capacity of Fe-Mn-La impregnated biochar (14.9 mg g−1) was significantly improved.•The adsorption mechanism of arsenic is mainly electrostatic attraction and inner-sphere complexation.•LaO plays an important role in As adsorption due to formation of La-O-As complex.
  • Editor: Netherlands: Elsevier B.V
  • Idioma: Inglês
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