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Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+.

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Title: Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+.
Authors: Wang, Lu-Si1 (AUTHOR), Wang, Yi-Rong1 (AUTHOR), Liao, Xiao-Yong2 (AUTHOR), Tang, Kuok Ho Daniel3,4 (AUTHOR), Li, You1,2 (AUTHOR) liyou@igsnrr.ac.cn, Shaheen, Sabry M.5 (AUTHOR), Li, Rong-Hua1,4 (AUTHOR) rh.lee@nwsuaf.edu.cn
Source: Colloids & Surfaces A: Physicochemical & Engineering Aspects. Sep2026, Vol. 744, pN.PAG-N.PAG. 1p.
Subjects: Arsenic removal (Groundwater purification), Biochar, Arsenic poisoning, Environmental remediation, Water purification, Soil remediation, Adsorption (Chemistry), Sorbents
Abstract: Developing a low-cost, highly efficient remediation biosorbent for arsenic (As5+ and As3+) is essential for protecting environments and using biomass resource. In this study, ZnCr-LDH- tailored sawdust biochar composites (ZnCr-LDH/BC) were synthesized and used as adsorbents for decontamination of arsenic -contaminated water and soil. ZnCr-LDH tailoring improved arsenic adsorption efficiency, especially for flower-like ZnCr-LDH/BC with a 4:1 molar ratio of Zn to Cr (4:1 ZnCr-LDH/BC). This formulation outperformed other adsorbents, including unmodified biochar. As5+ and As3+ adsorption processes are better simulated by the pseudo-second-order kinetic model and Sips model. At pH 7, 4:1 ZnCr-LDH/BC adsorbed up to 67.45 mg/g of As5+, and at pH 9, 24.55 mg/g of As3+. Ionic strength and co-existing ions exerted no significant inhibitory effects on As³ ⁺, but they hindered the adsorption of As⁵⁺. Besides ion exchange and complexation, electrostatic attraction also contributes to As⁵⁺ removal, but this mechanism is absent for As3+. Additionally, the practicality of composite was confirmed through its application in treating natural water and arsenic-contaminated industrial wastewater, as well as its column experiment performance and economic benefit evaluation. The addition of 4:1 ZnCr-LDH/BC reduced the DTPA-extractable content and leaching toxicity of As5+ and As3+in soil. The addition of 4:1 ZnCr-LDH/BC could alleviate the stress of arsenic on microorganisms, increase the wheat seedling biomass, and decrease the arsenic accumulation in the above-ground parts of plant. This study prepared and confirmed that 4:1 ZnCr-LDH/BC is a highly efficient adsorbent for As5+ and As3+. It can remediate arsenic-contaminated water bodies and soil in practice. [Display omitted] • 67.45 mg/g of As5+ and 24.55 mg/g of As3+ adsorbed by 4:1 ZnCr-LDH/BC. • As5+ adsorption occurred via ion exchange, electrostatic attraction and complexation. • As3+ adsorption occurred via ion exchange and ligand-exchange-induced complexation. • Composite increased soil As-tolerant flora richness and decreased plant As uptake. • ZnCr-LDH/BC is effective for treating arsenic-contaminated wastewater and soil. [ABSTRACT FROM AUTHOR]
Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
  Group: Ti
  Data: Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+.
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  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Lu-Si%22">Wang, Lu-Si</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yi-Rong%22">Wang, Yi-Rong</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liao%2C+Xiao-Yong%22">Liao, Xiao-Yong</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Tang%2C+Kuok+Ho+Daniel%22">Tang, Kuok Ho Daniel</searchLink><relatesTo>3,4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+You%22">Li, You</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> liyou@igsnrr.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Shaheen%2C+Sabry+M%2E%22">Shaheen, Sabry M.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Rong-Hua%22">Li, Rong-Hua</searchLink><relatesTo>1,4</relatesTo> (AUTHOR)<i> rh.lee@nwsuaf.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Colloids+%26+Surfaces+A%3A+Physicochemical+%26+Engineering+Aspects%22">Colloids & Surfaces A: Physicochemical & Engineering Aspects</searchLink>. Sep2026, Vol. 744, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Arsenic+removal+%28Groundwater+purification%29%22">Arsenic removal (Groundwater purification)</searchLink><br /><searchLink fieldCode="DE" term="%22Biochar%22">Biochar</searchLink><br /><searchLink fieldCode="DE" term="%22Arsenic+poisoning%22">Arsenic poisoning</searchLink><br /><searchLink fieldCode="DE" term="%22Environmental+remediation%22">Environmental remediation</searchLink><br /><searchLink fieldCode="DE" term="%22Water+purification%22">Water purification</searchLink><br /><searchLink fieldCode="DE" term="%22Soil+remediation%22">Soil remediation</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Sorbents%22">Sorbents</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Developing a low-cost, highly efficient remediation biosorbent for arsenic (As5+ and As3+) is essential for protecting environments and using biomass resource. In this study, ZnCr-LDH- tailored sawdust biochar composites (ZnCr-LDH/BC) were synthesized and used as adsorbents for decontamination of arsenic -contaminated water and soil. ZnCr-LDH tailoring improved arsenic adsorption efficiency, especially for flower-like ZnCr-LDH/BC with a 4:1 molar ratio of Zn to Cr (4:1 ZnCr-LDH/BC). This formulation outperformed other adsorbents, including unmodified biochar. As5+ and As3+ adsorption processes are better simulated by the pseudo-second-order kinetic model and Sips model. At pH 7, 4:1 ZnCr-LDH/BC adsorbed up to 67.45 mg/g of As5+, and at pH 9, 24.55 mg/g of As3+. Ionic strength and co-existing ions exerted no significant inhibitory effects on As³ ⁺, but they hindered the adsorption of As⁵⁺. Besides ion exchange and complexation, electrostatic attraction also contributes to As⁵⁺ removal, but this mechanism is absent for As3+. Additionally, the practicality of composite was confirmed through its application in treating natural water and arsenic-contaminated industrial wastewater, as well as its column experiment performance and economic benefit evaluation. The addition of 4:1 ZnCr-LDH/BC reduced the DTPA-extractable content and leaching toxicity of As5+ and As3+in soil. The addition of 4:1 ZnCr-LDH/BC could alleviate the stress of arsenic on microorganisms, increase the wheat seedling biomass, and decrease the arsenic accumulation in the above-ground parts of plant. This study prepared and confirmed that 4:1 ZnCr-LDH/BC is a highly efficient adsorbent for As5+ and As3+. It can remediate arsenic-contaminated water bodies and soil in practice. [Display omitted] • 67.45 mg/g of As5+ and 24.55 mg/g of As3+ adsorbed by 4:1 ZnCr-LDH/BC. • As5+ adsorption occurred via ion exchange, electrostatic attraction and complexation. • As3+ adsorption occurred via ion exchange and ligand-exchange-induced complexation. • Composite increased soil As-tolerant flora richness and decreased plant As uptake. • ZnCr-LDH/BC is effective for treating arsenic-contaminated wastewater and soil. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Colloids & Surfaces A: Physicochemical & Engineering Aspects is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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    Identifiers:
      – Type: doi
        Value: 10.1016/j.colsurfa.2026.140552
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Arsenic removal (Groundwater purification)
        Type: general
      – SubjectFull: Biochar
        Type: general
      – SubjectFull: Arsenic poisoning
        Type: general
      – SubjectFull: Environmental remediation
        Type: general
      – SubjectFull: Water purification
        Type: general
      – SubjectFull: Soil remediation
        Type: general
      – SubjectFull: Adsorption (Chemistry)
        Type: general
      – SubjectFull: Sorbents
        Type: general
    Titles:
      – TitleFull: Function and mechanism of ZnCr-LDH-tailored sawdust biochar composite on decontamination of water and soil contaminated with As5 + and As3+.
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            NameFull: Wang, Lu-Si
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            NameFull: Wang, Yi-Rong
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              M: 09
              Text: Sep2026
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              Y: 2026
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              Value: 744
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