Preparation and evaluation of celite decorated iron nanoparticles for the sequestration performance of hexavalent chromium from aqueous solution

Cheng, Xiankui; Chen, Junjie; Li, Hui; Sheng, Guodong

doi:10.1007/s11356-023-26896-4

Cited by 11 publications

(1 citation statement)

References 73 publications

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“…For example, nZVI@GT/DE nanocomposite showed an excellent Cr(VI) immobilization capacity in paddy soil which was seven times higher than that (13.5 mg g −1 ) of the existing nZVI/celestite (columnar porous structure) composite synthesized by NaBH 4 reductant in water at neutral pH (Table S4). 46 Notably, nZVI@GT/DE could immobilize more Cr(VI) in soil compared to that achieved by nZVI@GT/Mont (45.73 mg g −1 ). 8 This confirmed the superior capabilities for Cr(VI) adsorption and reduction by the green-synthesized nZVI@ GT/DE with the porous columnar structure compared to nZVI@GT/Mont with the sandwich structure.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

Mechanistic Insights into Increased Reduction and Removal of Cr(VI) by Clay-Mediated nZVI during Their Cotransport in Soil–Water Systems

Ye,

Liu,

et al. 2024

ACS EST Water

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The efficiency and stability of in situ remediation of Cr(VI) contamination in underground water and soil are still challenging. In this study, a green tea (GT) synthesized nanozerovalent iron (nZVI) nanocomposite supported by diatomite (DE) (nZVI@GT/DE) via tea polyphenols was designed. The synergetic effect of DE support and tea polyphenols wrapping increased the Fe(II) component in nZVI@GT/DE and its transportability. Compared to nZVI@GT/Mont (supported by Mont with sandwich structure), nZVI@GT/DE exhibited a notably higher capacity (>100 mg g −1 ) for immobilizing Cr(VI) and a more pronounced ability to release iron ions in solution (corrosion parameter: K ≈ 1.046). This was attributed to the combined effect of the unwrapping process of tea polyphenols coverage and the distinctive columnar porous structure of DE, which increased the exposure of α-Fe 0 core for enhanced Cr(VI) reduction during their cotransport in the water-saturated soil system. X-ray absorption fine structure and X-ray photoelectron spectroscopy analyses confirmed that nZVI@GT/DE released more Fe(II) ions to reduce Cr(VI) to bidentate binuclear Cr(OH) 3 (vs FeOCr 2 O 3 ) complexes. This study unraveled the molecular mechanism and highlighted the Cr speciation transformation and physiochemical property changes of nZVI@GT/DE during their cotransporting when applied in situ remediation in complex subsurface of Cr(VI)-contaminated groundwater and soil system.

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Section: ■ Results and Discussionmentioning

confidence: 95%