Iron-modified biochar-based bilayer permeable reactive barrier for Cr(VI) removal

Zhou, Ziyi; Liu, Peng; Wang, Sheng; Finfrock, Y. Zou; Ye, Zhihang; Feng, Yujie; Li, Xiaodan

doi:10.1016/j.jhazmat.2022.129636

Cited by 34 publications

(11 citation statements)

References 44 publications

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“…Detailed methods with respect to sample preparation, beamline instrumentation and setup, and methods of data collection and fitting results evaluation are provided in the SI and previous studies. 36,37 Sb Isotope Analysis by MC-ICP-MS. Sb isotope samples were collected during the kinetic, isothermal, and adsorption edge experiments and subjected to isotope separation and purification methods mainly based on previous reports. 20 Ion exchange chromatography combined with a thiol resin column was used for the separation and purification of Sb isotopes.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

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Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

Zhou

Feng

et al. 2023

Environ. Sci. Technol.

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A lack of knowledge about antimony (Sb) isotope fractionation mechanisms in key geochemical processes has limited its environmental applications as a tracer. Naturally widespread iron (Fe) (oxyhydr)oxides play a key role in Sb migration due to strong adsorption, but the behavior and mechanisms of Sb isotopic fractionation on Fe (oxyhydr)oxides are still unclear. Here, we investigate the adsorption mechanisms of Sb on ferrihydrite (Fh), goethite (Goe), and hematite (Hem) using extended X-ray absorption fine structure (EXAFS) and show that inner-sphere complexation of Sb species with Fe (oxyhydr)oxides occurs independent of pH and surface coverage. Lighter Sb isotopes are preferentially enriched on Fe (oxyhydr)oxides due to isotopic equilibrium fractionation, with neither surface coverage nor pH influencing the degree of fractionation (Δ123Sbaqueous‑adsorbed). Limited Fe atoms are present in the second shell of Hem and Goe, resulting in weaker surface complexes and leading to greater Sb isotopic fractionation than with Fh (Δ123Sbaqueous‑adsorbed of 0.49 ± 0.004, 1.12 ± 0.006, and 1.14 ± 0.05‰ for Fh, Hem, and Goe, respectively). These results improve the understanding of the mechanism of Sb adsorption by Fe (oxyhydr)oxides and further clarify the Sb isotope fractionation mechanism, providing an essential basis for future application of Sb isotopes in source and process tracing.

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Section: ■ Materials and Methodsmentioning

confidence: 99%

“…The fitting was employed to obtain the CNs, Δ E 0 , f , σ 2 , Δ R , and goodness of fit ( R -factor). Detailed methods with respect to sample preparation, beamline instrumentation and setup, and methods of data collection and fitting results evaluation are provided in the SI and previous studies. , …”

Section: Methodsmentioning

confidence: 99%

Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

Zhou

Feng

et al. 2023

Environ. Sci. Technol.

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“…Three to six scans were performed for each sample. The detailed description of XAFS analysis was reported previously; , a summary is also provided in Section S1 of Supporting Information.…”

Section: Materials and Methodsmentioning

confidence: 99%

NOM-Induced Dissolution of Cr_xFe_1–x(OH)₃ Precipitates and Formation of Cr(III)-NOM-Fe Colloids under Oxic and Anoxic Conditions

Zhang

Liao

et al. 2022

ACS Earth Space Chem.

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Mixed Cr(III)–Fe(III) (hydr)oxides (Cr x Fe1–x (OH)3) are common reduction products of Cr(VI) that have long been considered as the sink of Cr in subsurface environments. While current field and laboratory studies have demonstrated that natural organic matter (NOMox) can dissolve Cr x Fe1–x (OH)3 under oxic conditions, much less is known regarding the dissolution of Cr x Fe1–x (OH)3 by reduced NOM (NOMred) and geochemical behaviors of released Cr(III) under anoxic conditions, which limited our ability to completely predict the cycle of Cr. This study provided new knowledge regarding the simultaneous dissolution of Cr x Fe1–x (OH)3 and formation of Cr(III)-NOM-Fe colloids by NOMox and NOMred under oxic and anoxic conditions. We showed that NOM dissolved Cr x Fe1–x (OH)3 via ligand-promoted dissolution under oxic conditions and reductive dissolution under anoxic conditions, releasing aqueous Cr(III) and Fe(III/II). Size fractionization results showed that the aqueous Cr(III) and Fe observed at high NOM concentration were Cr(III)-NOM-Fe colloids (ca. 3–450 nm). Dynamic light scattering results further revealed that the colloids had a particle size ranging from 79 to 167 nm and strongly negative surface charges (−40––17 mV). Cryogenic X-ray photoelectron spectroscopy and X-ray absorption fine structure measurements further indicated a close association of NOM with Cr and Fe within the particle structure. This study provides insights into the fate of Cr x Fe1–x (OH)3 in redox-dynamics and organic-rich environments, which is critical for evaluating the long-term stability of Cr remediation sites.

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“…The calcium hydroxide modified mangosteen peel especially exhibited highly selective adsorption for Cr(VI) over other metal ions, such as Pb(II), Fe(III), Zn(II), Cd(II) and Cr(III), and the cost-effective and ecofriendly functionalization process made it useful as a green adsorbent [ 162 ]. To remove Cr(VI) from groundwater, Fe-modified BC (FeBC) was used as permeable reactive barriers (PRBs) [ 163 ]. The long-period (563 days) tests confirmed its excellent performance in terms of Cr(VI) removal with a relatively low cost.…”

Section: Cr Removal: the Developed Adsorbentsmentioning

confidence: 99%

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

et al. 2023

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Emerging chromium (Cr) species have attracted increasing concern. A majority of Cr species, especially hexavalent chromium (Cr(VI)), could lead to lethal effects on human beings, animals, and aquatic lives even at low concentrations. One of the conventional water-treatment methodologies, adsorption, could remove these toxic Cr species efficiently. Additionally, adsorption possesses many advantages, such as being cost-saving, easy to implement, highly efficient and facile to design. Previous research has shown that the application of different adsorbents, such as carbon nanotubes (carbon nanotubes (CNTs) and graphene oxide (GO) and its derivatives), activated carbons (ACs), biochars (BCs), metal-based composites, polymers and others, is being used for Cr species removal from contaminated water and wastewater. The research progress and application of adsorption for Cr removal in recent years are reviewed, the mechanisms of adsorption are also discussed and the development trend of Cr treatment by adsorption is proposed.

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Iron-modified biochar-based bilayer permeable reactive barrier for Cr(VI) removal

Cited by 34 publications

References 44 publications

Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

NOM-Induced Dissolution of Cr_xFe_1–x(OH)₃ Precipitates and Formation of Cr(III)-NOM-Fe Colloids under Oxic and Anoxic Conditions

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

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Iron-modified biochar-based bilayer permeable reactive barrier for Cr(VI) removal

Cited by 34 publications

References 44 publications

Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

Antimony Isotope Fractionation Revealed from EXAFS during Adsorption on Fe (Oxyhydr)oxides

NOM-Induced Dissolution of CrxFe1–x(OH)3 Precipitates and Formation of Cr(III)-NOM-Fe Colloids under Oxic and Anoxic Conditions

Removal of Chromium Species by Adsorption: Fundamental Principles, Newly Developed Adsorbents and Future Perspectives

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Product

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NOM-Induced Dissolution of Cr_xFe_1–x(OH)₃ Precipitates and Formation of Cr(III)-NOM-Fe Colloids under Oxic and Anoxic Conditions