Mechanistic insights into sulfate and phosphate-mediated hexavalent chromium removal by tea polyphenols wrapped nano-zero-valent iron

Du, Changsheng; Xu, Nan; Yao, Zihan; Xu, Bin; Gao, Yang; Peng, Lei; Gu, Baohua; Zhao, Jiating

doi:10.1016/j.scitotenv.2022.157996

Cited by 20 publications

(3 citation statements)

References 67 publications

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“…Additionally, tea polyphenols can improve the stability of nZVI without promoting the reduction of Cr(VI). 47 To clarify the release of Fe(II) from specific clays (DE and Mont) supported by nZVI@GT/Clays during transport, the corrosion kinetics of Fe 0 in nZVI@GT/DE (and nZVI@GT/ Mont for comparison) were investigated. Both materials released soluble Fe(II) within 30 min at low pH due to the corrosion by H + and O 2 (Figure 2i).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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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: 99%

“…This observation is supported by the EDS analysis of the effluent particles, which exhibited higher signals of Fe, K, Cl, and other elements (Figure h vs k), likely due to the interactions between nZVI@GT/DE and soil. Additionally, tea polyphenols can improve the stability of nZVI without promoting the reduction of Cr(VI) …”

Section: Resultsmentioning

confidence: 99%

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 green synthesis approach in developing zero-valent iron nanoparticles was an important process for the treatment of brominated organic compounds, pesticides, azo dyes, alkaline-earth metals, malachite green, nitrate, monochlorobenzene, antibiotics, and conversion of some metals like chromium, cobalt, and copper [112, [247][248][249][250][251][252][253][254][255]. The aqueous solution of rose apple (Syzygium jambos (L.) Alston) leaf extract synthesized zerovalent iron nanoparticles eliminated to hexavalent chromium metal.…”

Section: Green Synthesis Of Iron (Fe) Nanoparticles and Their Applica...mentioning

confidence: 99%

Applications of Green Synthesized Metal Nanoparticles — a Review

Vijayaram

Razafindralambo

Sun

et al. 2023

Biol Trace Elem Res

148

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Green nanotechnology is an emerging field of science that focuses on the production of nanoparticles by living cells through biological pathways. This topic plays an extremely imperative responsibility in various fields, including pharmaceuticals, nuclear energy, fuel and energy, electronics, and bioengineering. Biological processes by green synthesis tools are more suitable to develop nanoparticles ranging from 1 to 100 nm compared to other related methods, owing to their safety, ecofriendliness, non-toxicity, and cost-effectiveness. In particular, the metal nanoparticles are synthesized by top-down and bottom-up approaches through various techniques like physical, chemical, and biological methods. Their characterization is very vital and the confirmation of nanoparticle traits is done by various instrumentation analyses such as UV-Vis spectrophotometry (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), atomic force microscopy (AFM), annular dark-field imaging (HAADF), and intracranial pressure (ICP). In this review, we provide especially information on green synthesized metal nanoparticles, which are helpful to improve biomedical and environmental applications. In particular, the methods and conditions of plant-based synthesis, characterization techniques, and applications of green silver, gold, iron, selenium, and copper nanoparticles are overviewed.

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