Acetaminophen removal using green synthesized iron nanoparticles with a fresh water microalga, Planktochlorella nurekis

Kumar, C.S. Praveen; Sylas, V. P.; Cyril, Neethu; Ambily, V; Sunila, C T; Sreekanth, N P; Rayaroth, Manoj P.

doi:10.1016/j.nanoso.2021.100700

Cited by 9 publications

(2 citation statements)

References 51 publications

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“…As illustrated in Figure S8a–c, the Langmuir model demonstrated a superior fit to the adsorption of Cr(VI) by SAZVI when compared to that of the Freundlich model. The fitting coefficients, ranging from 0.93 to 0.96 for various SAZVI samples, suggested that the adsorption occurred uniformly within the adsorbent and resulted in the formation of a monolayer of Cr(VI) on the surface of SAZVI . The amount of Cr(VI) adsorbed by SAZVIs initially increased with an increase in the concentration of the adsorbent, followed by reaching equilibrium within a specific range.…”

Section: Resultsmentioning

confidence: 95%

“…The fitting coefficients, ranging from 0.93 to 0.96 for various SAZVI samples, suggested that the adsorption occurred uniformly within the adsorbent and resulted in the formation of a monolayer of Cr(VI) on the surface of SAZVI. 62 The amount of Cr(VI) adsorbed by SAZVIs initially increased with an increase in the concentration of the adsorbent, followed by reaching equilibrium within a specific range. Additionally, the maximum Langmuir adsorption capacities of SAZVI-Na 2 S, SAZVI-Na 2 S 2 O 4 , and SAZVI-K 2 S 6 for Cr(VI) were found to be 123.86, 61.52, and 76.43 mg/g (Table S5), respectively.…”

Section: ■ Experimental Sectionmentioning

confidence: 98%

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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: 95%

Section: ■ Experimental Sectionmentioning

confidence: 98%