Improved performance and applicability of copper-iron bimetal by sulfidation for Cr(VI) removal

Qu, Min; Chen, Hui-Xia; Wang, Yuan; Wang, Xingrun; Tong, Xuejiao; Li, Shupeng; Xu, Hongbin

doi:10.1016/j.chemosphere.2021.130820

Cited by 13 publications

(2 citation statements)

References 47 publications

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“…We conducted Pearson correlation analysis to elucidate the interplay between physicochemical properties and Cr(VI) reaction rates ( k ). Given the limited number of samples, we supplemented the discussion on certain physicochemical properties with relevant references to ensure a more precise characterization of their relationships. – In Figure a, a positive correlation ( r = 0.8682) was observed between k and the water contact angle, indicating that the increased hydrophobicity of SAZVI reduced the occurrence of side reactions and enhanced the electron efficiency. Despite the water solubility of Cr(VI) ions, the large specific surface area of SAZVI facilitated their contact with the material, leading to accelerated removal of Cr(VI).…”

Section: Resultsmentioning

confidence: 99%

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Lin

Zhu

et al. 2023

Langmuir

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Amorphous zerovalent iron (AZVI) has gained considerable attention due to its remarkable reactivity, but there is limited research on sulfidated amorphous zerovalent iron (SAZVI) and the influence of different sulfur precursors on its reactivity remains unclear. In this study, SAZVI materials with an amorphous structure were synthesized using various sulfur precursors, resulting in significantly increased specific surface area and hydrophobicity compared to AZVI. The Cr(VI) removal efficiency of SAZVI-Na2S, which exhibited the most negative free corrosion potential (−0.82 V) and strongest electron transfer ability, was up to 8.5 times higher than that of AZVI. Correlation analysis revealed that the water contact angle (r = 0.87), free corrosion potential (r = −0.92), and surface Fe(II) proportion (r = 0.98) of the SAZVI samples played crucial roles in Cr(VI) removal. Furthermore, the enhanced elimination ability of SAZVI-Na2S was analyzed, primarily attributed to the adsorption of Cr(VI) by the FeS x shell, followed by the rapid release of internal electrons to reduce Cr(VI) to Cr(III). This process ultimately led to the precipitation of FeCr2O4 and Cr2S3 on the surface of SAZVI-Na2S, resulting in their removal from the water. This study provides insights into the influence of sulfur precursors on the reactivity of SAZVI and offers a new strategy for designing highly active AZVI for efficient Cr(VI) removal.

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Section: Resultsmentioning

confidence: 99%

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Lin

Zhu

et al. 2023

Langmuir

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“…Therefore, it is imperative to modify the nZVI to improve the performances of removing Cr(VI). Among the different modifying approaches, sul dation stands out because of the merits of inexpensive, environmental benign, and technologically simple 17 . S-nZVI, de ned as the nZVI after sul dation, are more suitable for Cr(VI) removal compared with nZVI because of:…”

Section: Introductionmentioning

confidence: 99%

Sulfidation of nano zero-valent iron (S-nZVI) for enhanced hexavalent chromium (Cr(VI)) removal performances

Feng

Wang

et al. 2022

Preprint

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Nano zero-valent iron (nZVI) and sulfidation modified nZVI (S-nZVI) were synthesized and employed for hexavalent chromium (Cr(VI)) removal in wastewater. Characterizations of products showed that the sulfidation process could significantly change the morphologies, and the degree of crystallinity was also enhanced. The effects of S/Fe ratio, pH value and reaction temperature were studied, the most appropriate parameter was considered of S/Fe ratio = 0.5, and removal efficiency could reach up to the 98% in the condition of pH = 2. The influences of anions (Cl−, NO3−, CO32−, and SO42−) and cations (Ca2+ and Mg2+) on the Cr(VI) removal efficiency were investigated and the mechanisms were discussed. The Cr(VI) removal efficiency of S-nZVI was obviously better than that of nZVI, mainly owing to the existence of FeS layers that could protect Fe0 cores and prompt electron transfer. The aging and cycling experiments showed that S-nZVI products could maintain its reactivity facing the corrosion of water, and showed satisfying cycling stability. Thus, the prepared S-nZVI was an effective and feasible agent for the remediation of Cr(VI)-contained wastewater.

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Removal of Aqueous Cr(VI) by Tea Stalk Biochar Supported Nanoscale Zero-Valent Iron: Performance and Mechanism

Mao

Tao

Zhang

et al. 2023

Water Air Soil Pollut

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Improved performance and applicability of copper-iron bimetal by sulfidation for Cr(VI) removal

Cited by 13 publications

References 47 publications

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Physicochemical Effects of Sulfur Precursors on Sulfidated Amorphous Zero-Valent Iron and Its Enhanced Mechanisms for Cr(VI) Removal

Sulfidation of nano zero-valent iron (S-nZVI) for enhanced hexavalent chromium (Cr(VI)) removal performances

Removal of Aqueous Cr(VI) by Tea Stalk Biochar Supported Nanoscale Zero-Valent Iron: Performance and Mechanism

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