Removal of nitrate from groundwater by nano-scale zero-valent iron injection pulses in continuous-flow packed soil columns

Gibert, Oriol; Abenza, Misael; Reig, Mònica; Vecino, Xanel; Sánchez, Damián; Arnaldos, Marina; Cortina, José Luis

doi:10.1016/j.scitotenv.2021.152300

Cited by 27 publications

(4 citation statements)

References 46 publications

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“…The EDS analysis of AZVI depicted in Figure S2 indicated that it comprised predominantly Fe (86.6%) and O (13.4%) elements, with Fe primarily located in the Fe 0 core and O in the outer oxide shell, in accordance with other reported crystalline ZVI. 37,38 The chemical composition of the iron oxide shell is strongly related to the synthetic method and generally includes FeO, magnetite, and hematite. 39 Considering this, we conducted XRD to analyze the phase composition of AZVI.…”

Section: ■ Experimental Sectionmentioning

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: ■ Experimental Sectionmentioning

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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“…In recent years, great attention has been paid to the nanoscale zero-valent iron (NZVI) due to its remarkable reactivity with a range of pollutants, including organic compounds, 1 nitrates, 2,3 and heavy metal ions. 4 However, the application of NZVI is limited by the disadvantages of easy passivation and poor selectivity.…”

Section: Introductionmentioning

confidence: 99%

Different sulfidized procedures and sulfur precursors alter the bacterial toxicity of sulfidized nanoscale zero-valent iron by affecting the physicochemical properties

Zhang,

Li,

Dong

et al. 2024

Environ. Sci.: Nano

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“…Chemical methods to remove NO 3 − and PO 4 3− are based on the reaction between a number of iron and aluminum salts with NO 3 − and PO 4 3− to form insoluble precipitates that are easily removed from water [10][11][12][13][14]. Other chemical techniques to remove NO 3 − are involved in the chemical reduction of NO 3 − by chemical reductants, especially hydrazine [15], sodium sulfite [16][17][18], zero-valent metal [19][20][21][22][23], and hydrogen [24,25]. Physical technologies have also been used, such as the adsorption of NO 3…”

Section: Introductionmentioning

confidence: 99%

Amine-Grafted Pomegranate Peels for the Simultaneous Removal of Nitrate and Phosphate Anions from Wastewater

Abbach,

Laghlimi,

Isaad

2023

Sustainability

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Pomegranate peel (PP), a by-product of agro-food consumption, has a low adsorption capacity for nitrate and phosphate ions in aqueous media, but its surface is very rich in alcohol functional groups. In this work, the surface of pomegranate peels was functionalized by chemo-grafting 3-(2-Aminoethylamino) propyl] trimethoxy silane (AEAPTES) using the availability of alcohol groups to increase the adsorption capacity of the resulting adsorbent (PP/AEAPTES) towards nitrate and phosphate ions. The prepared PP/AEAPTES adsorbent was analyzed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Zeta potential, and X-ray photoelectron spectrometry (XPS). Under experimental conditions, the adsorption capacity of PP/AEAPTES has been found to be 124.57 mg/g and 94.65 mg/g for NO3− and PO43−, respectively, at pH 6 over a wide temperature range, and adsorption is exothermic for NO3− and endothermic for PO43−, as well as spontaneous and physical in nature. The adsorptions of NO3− and PO43− were also correctly described by the Langmuir isotherm and followed the pseudo-second-order model. The ability of PP/AEAPTES to adsorb NO3− and PO43− ions under real conditions was evaluated, and efficient regeneration and repetitive use of PP/AEAPTES was successfully achieved up to 5 cycles.

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Removal of nitrate from groundwater by nano-scale zero-valent iron injection pulses in continuous-flow packed soil columns

Cited by 27 publications

References 46 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

Different sulfidized procedures and sulfur precursors alter the bacterial toxicity of sulfidized nanoscale zero-valent iron by affecting the physicochemical properties

Amine-Grafted Pomegranate Peels for the Simultaneous Removal of Nitrate and Phosphate Anions from Wastewater

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