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Arsenic removal by perilla leaf biochar in aqueous solutions and groundwater: An integrated spectroscopic and microscopic examination

Niazi, Nabeel Khan ; Bibi, Irshad ; Shahid, Muhammad ; Ok, Yong Sik ; Burton, Edward D. ; Wang, Hailong ; Shaheen, Sabry M. ; Rinklebe, Jörg ; Lüttge, Andreas

Environmental pollution (1987), 2018-01, Vol.232, p.31-41 [Periódico revisado por pares]

England: Elsevier Ltd

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  • Título:
    Arsenic removal by perilla leaf biochar in aqueous solutions and groundwater: An integrated spectroscopic and microscopic examination
  • Autor: Niazi, Nabeel Khan ; Bibi, Irshad ; Shahid, Muhammad ; Ok, Yong Sik ; Burton, Edward D. ; Wang, Hailong ; Shaheen, Sabry M. ; Rinklebe, Jörg ; Lüttge, Andreas
  • Assuntos: Adsorption ; Arsenates ; Arsenic - analysis ; Arsenic - chemistry ; Arsenic toxicity ; Arsenites ; Charcoal - chemistry ; Drinking water ; Groundwater - chemistry ; Groundwater remediation ; Oxidation-Reduction ; Perilla ; Plant Leaves - chemistry ; Sorbent ; Water filtration ; Water Pollutants, Chemical - analysis ; Water Pollutants, Chemical - chemistry ; Water Purification - methods ; X-Ray Absorption Spectroscopy ; X-Rays ; XANES
  • É parte de: Environmental pollution (1987), 2018-01, Vol.232, p.31-41
  • Descrição: In this study, we examined the removal of arsenite (As(III)) and arsenate (As(V)) by perilla leaf-derived biochars produced at 300 and 700 °C (referred as BC300 and BC700) in aqueous environments. Results revealed that the Langmuir isotherm model provided the best fit for As(III) and As(V) sorption, with the sorption affinity following the order: BC700-As(III) > BC700-As(V) > BC300-As(III) > BC300-As(V) (QL = 3.85–11.01 mg g−1). In general, As removal decreased (76–60%) with increasing pH from 7 to 10 except for the BC700-As(III) system, where notably higher As removal (88–90%) occurred at pH from 7 to 9. Surface functional moieties contributed to As sequestration by the biochars examined here. However, significantly higher surface area and aromaticity of BC700 favored a greater As removal compared to BC300, suggesting that surface complexation/precipitation dominated As removal by BC700. Arsenic K-edge X-ray absorption near edge structure (XANES) spectroscopy demonstrated that up to 64% of the added As(V) was reduced to As(III) in BC700- and BC300-As(V) sorption experiments, and in As(III) sorption experiments, partial oxidation of As(III) to As(V) occurred (37–39%). However, XANES spectroscopy was limited to precisely quantify As binding with sulfur species as As2S3-like phase. Both biochars efficiently removed As from natural As-contaminated groundwater (As: 23–190 μg L−1; n = 12) despite in the presence of co-occurring anions (e.g., CO32−, PO43−, SO42−) with the highest levels of As removal observed for BC700 (97–100%). Overall, this study highlights that perilla leaf biochars, notably BC700, possessed the greatest ability to remove As from solution and groundwater (drinking water). Significantly, the integrated spectroscopic techniques advanced our understanding to examine complex redox transformation of As(III)/As(V) with biochar, which are crucial to determine fate of As on biochar in aquatic environments. [Display omitted] •BC700 (high temperature) perilla leaf biochar removed more arsenite at pH 7–9 than BC300 (low temperature).•Langmuir model efficiently delineated sorption affinity for arsenite and arsenate, notably by BC700.•FTIR spectroscopy and elemental maps indicated arsenic association with surface functional groups.•XANES spectroscopy revealed redox transformation/fate of arsenite and arsenate on biochars.•Both biochars depleted arsenic in groundwater, with slightly higher removal by BC700. Our study shows that perilla leaf biochars efficiently removed As (As(III), As(V)) in aqueous solutions and groundwater (drinking water), and integrated spectroscopic techniques determined complex fate of As on biochars.
  • Editor: England: Elsevier Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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