Nitrate reduction by green rusts modified with trace metals

Choi, Jeong‐Yun; Batchelor, Bill; Won, Chan-Hee; Chung, Jinwook

doi:10.1016/j.chemosphere.2011.11.035

Cited by 37 publications

(27 citation statements)

References 22 publications

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“…The capacity of Fe to reduce nitrates in the presence of hydrogen has also been examined using monometallic catalysts supported on Fe-based supports. For instance, monometallic Pd catalysts with pillared clays as a support [77] or green rusts modified with trace metals (Pt, Cu, Zn) [78,79], which enhance the reaction rate of nitrate reduction, showed satisfactory activity, but high ammonium production was observed. Zero valent iron (ZVI) systems are the most representative catalysts containing iron studied in the literature so far.…”

Section: Monometallic Catalystmentioning

confidence: 99%

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Martínez

Ortiz

Ortíz

2017

Applied Catalysis B: Environmental

425

280

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates.

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Section: Monometallic Catalystmentioning

confidence: 99%

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Martínez

Ortiz

Ortíz

2017

Applied Catalysis B: Environmental

425

280

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“…GR can be described through the formula [Fe II (1- x ) Fe III x (OH) 2 ] x + [( x / n ) A n ( mx / n )H 2 O] x , where A represents anions such as chloride, carbonate [23] or sulfate [24,25]. In GR, positively charged brucite-like layers of edge-sharing octahedrally coordinated Fe(II) and Fe(III) hydroxide units are intercalated with anionic species and water molecules [21,26]. Due to the presence of Fe(II) on the surface, GR exhibits a reducing potential that can be conveniently used to reduce oxidized contaminants such as nitrate [27], chromate [28] and arsenic anions [29,30].…”

Section: Introductionmentioning

confidence: 99%

Kinetics and mechanism of selenate and selenite removal in solution by green rust-sulfate

et al. 2019

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This work investigated the removal of selenite and selenate from water by green rust (GR) sulfate. Selenite was immobilized by simple adsorption onto GR at pH 8, and by adsorption–reduction at pH 9. Selenate was immobilized by adsorption–reduction to selenite and zero valent selenium (Se 0 ) at both pH 8 and 9. In the process, GR oxidized to a mixture of goethite (FeOOH) and magnetite (Fe 3 O 4 ). The kinetics of selenite and selenate sorption at the GR–water interface was described through a pseudo-second-order model. X-ray absorption spectroscopy data enabled to elucidate the concentration profiles of Se and Fe species in the solid phase and allowed to distinguish two removal mechanisms, namely adsorption and reduction. Selenite and selenate were reduced by GR through homogeneous solid-phase reaction upon adsorption and by heterogeneous reaction at the solid–liquid interface. The selenite reduced through heterogeneous reduction with GR was adsorbed onto GR but not reduced further. The redox reaction between GR and selenite/selenate was kinetically described through an irreversible second-order bimolecular reaction model based on XAFS concentration profiles. Although the redox reaction became faster at pH 9, simple adsorption was always the fastest removal mechanism.

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“…Human excretion, agricultural activities and the industries producing fertilizer, meat and food, milk, and detergents are the main sources of nitrogenous wastes. The ground water nitrate (NO 3 ) concentration has increased globally [1,2]. Nitrate is transformed into nitrite in the digestive system of humans, which causes the condition known as methemoglobinemia, also called Blue Baby Syndrome [3].…”

Section: Introductionmentioning

confidence: 99%

Comparative modelling and molecular docking of nitrate reductase from Bacillus weihenstephanensis (DS45)

Seenivasagan

Kasimani

Rajakumar

et al. 2016

Journal of Taibah University for Science

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Nitrate reductase catalyses the oxidation of NAD(P)H and the reduction of nitrate to nitrite. NR serves as a central point for the integration of metabolic pathways by governing the flux of reduced nitrogen through several regulatory mechanisms in plants, algae and fungi. Bacteria express nitrate reductases that convert nitrate to nitrite, but mammals lack these specific enzymes. The microbial nitrate reductase reduces toxic compounds to nontoxic compounds with the help of NAD(P)H. In the present study, our results revealed that Bacillus weihenstephanensis expresses a nitrate reductase enzyme, which was made to generate the 3D structure of the enzyme. Six different modelling servers, namely Phyre2, RaptorX, M4T Server, HHpred, SWISS MODEL and Mod Web, were used for comparative modelling of the structure. The model was validated with standard parameters (PROCHECK and Verify 3D). This study will be useful in the functional characterization of the nitrate reductase enzyme and its docking with nitrate molecules, as well as for use with autodocking.

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Nitrate reduction by green rusts modified with trace metals

Cited by 37 publications

References 22 publications

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

State-of-the-art and perspectives of the catalytic and electrocatalytic reduction of aqueous nitrates

Kinetics and mechanism of selenate and selenite removal in solution by green rust-sulfate

Comparative modelling and molecular docking of nitrate reductase from Bacillus weihenstephanensis (DS45)

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