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Reversible and Irreversible Retention of Graphene Oxide in Porous Media: Sensitivity to Divalent and Trivalent Heavy Metals.

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Title: Reversible and Irreversible Retention of Graphene Oxide in Porous Media: Sensitivity to Divalent and Trivalent Heavy Metals.
Authors: Liang, Yan1,2 (AUTHOR) liangyan@gxu.edu.cn, Lv, Xiaoyan1,2 (AUTHOR), Qin, Yan1,2 (AUTHOR), Zhang, Rupin3 (AUTHOR)
Source: Water, Air & Soil Pollution. Mar2026, Vol. 237 Issue 6, p1-11. 11p.
Subject Terms: *Heavy metals, *Groundwater pollution, Graphene oxide, Metal ions, Sorption techniques, Ionic strength, Porous materials
Abstract: The transport and retention behaviors of graphene oxide (GO) in saturated porous media were examined in systems containing heavy metals (Cd2⁺, Zn2⁺, Cr3⁺), with a focus on the effects of ionic strength (IS) and cation type. Both IS and cation type were found to be key factors governing GO retention. Notably, Cr3⁺ most effectively inhibited GO transport, a result attributed to its strong charge shielding and promotion of straining. At a low IS of 0.3 mM, the inhibitory effects of Cr3⁺, Cd2⁺, and Zn2⁺ on GO transport followed the Hofmeister series. Higher IS (3 mM) led to greater GO deposition. In the presence of 3 mM Cd2⁺ and Zn2⁺, the remobilization of retained GO was evidenced by double peaks in breakthrough curves, attributed to cation exchange and reduced IS, indicating reversible retention. In contrast, significant retention with no release (irreversible retention) occurred under Cr3⁺ even at a low IS (< 0.6 mM). Combined analysis of GO aggregation, interaction energy, and CFT confirmed that double-layer compression, cation bridging, and straining collectively governed GO retention, leading to retention profiles (uniform, exponential, or hyper-exponential) that depended on IS and cation type. These results are valuable for understanding the coupled environmental fate of GO and heavy metals in subsurface systems and are critical for assessing groundwater contamination risks under transient solution chemistry. [ABSTRACT FROM AUTHOR]
Copyright of Water, Air & Soil Pollution is the property of Springer Nature 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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  Data: The transport and retention behaviors of graphene oxide (GO) in saturated porous media were examined in systems containing heavy metals (Cd2⁺, Zn2⁺, Cr3⁺), with a focus on the effects of ionic strength (IS) and cation type. Both IS and cation type were found to be key factors governing GO retention. Notably, Cr3⁺ most effectively inhibited GO transport, a result attributed to its strong charge shielding and promotion of straining. At a low IS of 0.3 mM, the inhibitory effects of Cr3⁺, Cd2⁺, and Zn2⁺ on GO transport followed the Hofmeister series. Higher IS (3 mM) led to greater GO deposition. In the presence of 3 mM Cd2⁺ and Zn2⁺, the remobilization of retained GO was evidenced by double peaks in breakthrough curves, attributed to cation exchange and reduced IS, indicating reversible retention. In contrast, significant retention with no release (irreversible retention) occurred under Cr3⁺ even at a low IS (&lt; 0.6 mM). Combined analysis of GO aggregation, interaction energy, and CFT confirmed that double-layer compression, cation bridging, and straining collectively governed GO retention, leading to retention profiles (uniform, exponential, or hyper-exponential) that depended on IS and cation type. These results are valuable for understanding the coupled environmental fate of GO and heavy metals in subsurface systems and are critical for assessing groundwater contamination risks under transient solution chemistry. [ABSTRACT FROM AUTHOR]
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  Data: &lt;i&gt;Copyright of Water, Air &amp; Soil Pollution is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder&#39;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.&lt;/i&gt; (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1007/s11270-025-09025-4
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      – Code: eng
        Text: English
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        PageCount: 11
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    Subjects:
      – SubjectFull: Heavy metals
        Type: general
      – SubjectFull: Groundwater pollution
        Type: general
      – SubjectFull: Graphene oxide
        Type: general
      – SubjectFull: Metal ions
        Type: general
      – SubjectFull: Sorption techniques
        Type: general
      – SubjectFull: Ionic strength
        Type: general
      – SubjectFull: Porous materials
        Type: general
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      – TitleFull: Reversible and Irreversible Retention of Graphene Oxide in Porous Media: Sensitivity to Divalent and Trivalent Heavy Metals.
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            – D: 15
              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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