Effect of bicarbonate on aging and reactivity of nanoscale zerovalent iron (nZVI) toward uranium removal

Ye, Hua; Wang, Wei; Xiaoyue, Huang; Gu, Tianhang; Ding, Dexin; Ling, Lan; Zhang, Wei‐xian

doi:10.1016/j.chemosphere.2018.03.041

Cited by 48 publications

(17 citation statements)

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“…纳米零价铁在无氧 Se(IV)溶液中腐蚀后, 颗粒被氧化仅有少量颗粒保持球状, 腐蚀产物生成大量致密且具有光滑表面的针状 Se(0)颗粒和球状 Se(0)颗粒(图 6f, g) [34] . Se(IV)溶液 pH 值对纳米零价铁表面化学和晶相结构有一定影响 [35] [26,32,33,35] M: [26,32,33,35] Peaks are [41] . [45] .…”

Section: 纳米零价铁表面化学和晶相结构unclassified

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Surface Chemistry and Phase Transformation of Nanoscale Zero-Valent Iron (nZVI) in Aquatic Media

Liu¹,

Gu²,

Wang³

et al. 2019

Acta Chim. Sinica

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The unique "core-shell" structure endows nanoscale zero-valent iron (nZVI) rich aquatic surface chemistry properties. Transformation of surface chemistry and crystal phase of nZVI affect its reactivity and environmental transport and fate. Recent advances on the surface chemistry and phase transformation of nZVI in aqueous media are highlighted in this paper focusing on a basic theory of nZVI for pollution control and environmental application. Surface chemistry and phase of both fresh and reacted nZVI are presented. The structure, composition and properties of nanoparticles are determined not only by reaction time but also by environmental conditions. Specifically, the influences of dissolved oxygen, hydraulic conditions (static and stirring), types and concentrations of heavy metals (U(VI), Cr(VI), Se(IV)) and anions (HPO − and 3 HCO − ) are investigated. In addition, the effect of surface modification with polyelectrolytes, including anionic polyacrylamide (APAM) and carboxymethylcellulose sodium (CMC), on microstructure, morphology and composition of nanoparticles in aqueous phase was discussed. Results demonstrate that environmental conditions have significant impacts on particles structure, composition and properties, consequently on nZVI performance for pollutant removal. After corrosion under different aqueous conditions, the core-shell structured nZVI are distorted and the metallic iron core is transformed into different iron oxides/hydroxides, such as γ-Fe 2 O 3 , Fe 3 O 4 and γ-FeOOH. These iron (hydr)oxides exhibit different surface complexation and affinity proprieties, thus eventually affecting the pollutant removal performance and the environmental fate of reaction products. More research on the effect of dynamic structure transformation by different types of pollutants, and a reaction model between the surface chemistry/phase transformation and removal performance are needed to deepen our understanding on nZVI surface chemistry, and develop more effective technologies of environmental applications. Keywords nanoscale zero-valent iron; aquatic media; surface chemistry; crystal phase; transformation 1 引言铁的标准氧化还原电位为-0.44 V, 零价铁材料 (Zero-Valent Iron, ZVI)因其强还原能力、良好的电化学和配位化学特性 [1～4] , 在环境修复领域被广泛应用. 纳米零价铁(nanoscale Zero-Valent Iron, nZVI)不但具有零

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Section: 纳米零价铁表面化学和晶相结构unclassified

“…Figure 7 (a) XRD patterns of nZVI corroded anaerobically in different anions (10 mmol/L) for 30 d; (b) TEM images of nZVI corroded anaerobically in 3 HCO − solution[41] .…”

mentioning

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Surface Chemistry and Phase Transformation of Nanoscale Zero-Valent Iron (nZVI) in Aquatic Media

Liu¹,

Gu²,

Wang³

et al. 2019

Acta Chim. Sinica

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“…The presence of contaminants such as toxic heavy metal ions and pharmaceutical contaminants in these water sources can be catastrophic to health [8]- [11]. Water contamination stems from various factors, including naturally occurring chemicals such as arsenic [12], radon, and uranium [13], besides agricultural practices such as fertilizers and pesticides [14]. Contamination problems are exacerbated by human related-activities such as industrial activities, manufacturing processes, sewer overflows, or wastewater discharges [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphene Oxide Synthesis Method on The Adsorption Performance of Pharmaceutical Contaminants

Idham¹,

Falyouna²,

Eljamal³

2021

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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Graphene oxide (GO) has drawn broad recognition as a novel adsorbent for various contaminants due to the unique physicochemical characteristics shown. This research investigated the effect of several graphene oxide synthesis methods on Ciprofloxacin (CIP), Diclofenac (DCF), and Tetracycline (TC) removal in water and optimized the methods experimentally. Material characterizations such as transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS) were employed to investigate the surface morphology of GO. A batch test has been done to study the adsorption kinetics. GO synthesis techniques are crucial and have varying impacts on pharmaceutical contaminants removal. The optimized GO synthesis method showed the most reliable CIP removal performance, where 64% of CIP was effectively adsorbed within 10 minutes. The production of high-quality GO for CIP and DCF removal does not rely on sodium nitrate (NaNO3) or phosphoric acid (H3PO4) catalysts. The GO produced without catalysts eliminated 94.3% of DCF within 10 minutes.

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“…In particular, adsorption takes advantages of the rapid and highly efficient treatment of uranium by developing adsorbent materials with programmable functionalization [7]. Until now, much attention has been paid to the development of nanostructured adsorbents for higher adsorption efficiency [8,9]. One of the most promising directions is the fabrication of composite materials which combine the functionality of individual components into one [10,11].…”

Section: Introductionmentioning

confidence: 99%

Facile Preparation of Graphene Oxide-MIL-101(Fe) Composite for the Efficient Capture of Uranium

2018

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Graphene oxide (GO)-MIL-101(Fe) (Fe-based metal-organic frameworks (MOFs) with Fe(III) as the metal anode and 2-aminobenzene-1,4-dicarboxylic acid as a ligand) sandwich composites are designed and fabricated through a facile in situ growth method. By modulating the addition amount of GO nanosheets, composites containing MIL-101(Fe) octahedrons with a tunable dimension and density are achieved. The optimized ratio between individual components is determined through adsorption experiments. Adsorption isotherms reveal an enhanced adsorption efficiency and improved adsorption capacity of GO15-MIL-101(Fe) (GO dosage is 15 mg) in comparison with raw MIL-101(Fe) nanocrystals. Experimental evidence indicates that the removal of U(VI) by the composite is based on inner-sphere surface complexation and electrostatic interaction. The improved adsorption performance originates from the optimized synergistic effects of GO and MIL-101(Fe) octahedrons. In summary, this work offers a facile synthetic method to achieve cost-effective composites towards the U(VI) capture. It also lays the foundation for the design of novel adsorbents with the full play of component’s functionality.

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Effect of bicarbonate on aging and reactivity of nanoscale zerovalent iron (nZVI) toward uranium removal

Cited by 48 publications

References 58 publications

Surface Chemistry and Phase Transformation of Nanoscale Zero-Valent Iron (nZVI) in Aquatic Media

Surface Chemistry and Phase Transformation of Nanoscale Zero-Valent Iron (nZVI) in Aquatic Media

Effect of Graphene Oxide Synthesis Method on The Adsorption Performance of Pharmaceutical Contaminants

Facile Preparation of Graphene Oxide-MIL-101(Fe) Composite for the Efficient Capture of Uranium

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