Redox Transformation of Adducts from Cycloaddition of Diazoacetic Ester to β-Arylacryloyloxiranes.

S. G. Mikhalenok; N. M. Kuz'menok; A. M. Zvonok

doi:10.1002/chin.200633132

Redox Transformation of Adducts from Cycloaddition of Diazoacetic Ester to β-Arylacryloyloxiranes.

ChemInform ◽

10.1002/chin.200633132 ◽

2006 ◽

Vol 37 (33) ◽

Author(s):

S. G. Mikhalenok ◽

N. M. Kuz'menok ◽

A. M. Zvonok

Keyword(s):

Redox Transformation ◽

Diazoacetic Ester

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Redox Transformation of Adducts from Cycloaddition of Diazoacetic Ester to β-Arylacryloyloxiranes

Chemistry of Heterocyclic Compounds ◽

10.1007/s10593-005-0264-7 ◽

2005 ◽

Vol 41 (8) ◽

pp. 977-986 ◽

Cited By ~ 3

Author(s):

S. G. Mikhalenok ◽

N. M. Kuz'menok ◽

A. M. Zvonok

Keyword(s):

Redox Transformation ◽

Diazoacetic Ester

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Redox transformation of structural iron in nontronite induced by quinones under anoxic conditions

The Science of The Total Environment ◽

10.1016/j.scitotenv.2021.149637 ◽

2021 ◽

pp. 149637

Author(s):

Na Zhang ◽

Man Tong ◽

Songhu Yuan

Keyword(s):

Redox Transformation ◽

Anoxic Conditions ◽

Structural Iron

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Arsenate and Arsenite Removal by Zerovalent Iron: Kinetics, Redox Transformation, and Implications for in Situ Groundwater Remediation

Environmental Science & Technology ◽

10.1021/es001607i ◽

2001 ◽

Vol 35 (7) ◽

pp. 1487-1492 ◽

Cited By ~ 293

Author(s):

Chunming Su ◽

Robert W. Puls

Keyword(s):

Groundwater Remediation ◽

Zerovalent Iron ◽

Redox Transformation ◽

Iron Kinetics ◽

Arsenite Removal

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Sorption mechanisms of antibiotic sulfamethazine (SMT) on magnetite-coated biochar: pH-dependence and redox transformation

Chemosphere ◽

10.1016/j.chemosphere.2020.128805 ◽

2020 ◽

pp. 128805 ◽

Cited By ~ 1

Author(s):

Shanshan Bai ◽

Shishu Zhu ◽

Chao Jin ◽

Zhiqiang Sun ◽

Li Wang ◽

...

Keyword(s):

Ph Dependence ◽

Redox Transformation ◽

Sorption Mechanisms

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Electrochemical, Spectroscopic, and Computational Investigations on Redox Reactions of Selenium Species on Galena Surfaces

Minerals ◽

10.3390/min9070437 ◽

2019 ◽

Vol 9 (7) ◽

pp. 437 ◽

Cited By ~ 1

Author(s):

Peter Cook ◽

YoungJae Kim ◽

Ke Yuan ◽

Maria C. Marcano ◽

Udo Becker

Keyword(s):

Photoelectron Spectroscopy ◽

Redox Reactions ◽

Redox Potentials ◽

Free Energies ◽

Cathodic Peak ◽

Redox Transformation ◽

Hydrogen Electrode ◽

Midpoint Potential ◽

Ph Conditions ◽

Cv Measurements

Despite previous studies investigating selenium (Se) redox reactions in the presence of semiconducting minerals, Se redox reactions mediated by galena (PbS) are poorly understood. In this study, the redox chemistry of Se on galena is investigated over a range of environmentally relevant Eh and pH conditions (+0.3 to −0.6 V vs. standard hydrogen electrode, SHE; pH 4.6) using a combination of electrochemical, spectroscopic, and computational approaches. Cyclic voltammetry (CV) measurements reveal one anodic/cathodic peak pair at a midpoint potential of +30 mV (vs. SHE) that represents reduction and oxidation between HSeO3− and H2Se/HSe−. Two peak pairs with midpoint potentials of −400 and −520 mV represent the redox transformation from Se(0) to HSe− and H2Se species, respectively. The changes in Gibbs free energies of adsorption of Se species on galena surfaces as a function of Se oxidation state were modeled using quantum-mechanical calculations and the resulting electrochemical peak shifts are (−0.17 eV for HSeO3−/H2Se, −0.07 eV for HSeO3−/HSe−, 0.15 eV for Se(0)/HSe−, and −0.15 eV for Se(0)/H2Se). These shifts explain deviation between Nernstian equilibrium redox potentials and observed midpoint potentials. X-ray photoelectron spectroscopy (XPS) analysis reveals the formation of Se(0) potentials below −100 mV and Se(0) and Se(−II) species at potentials below −400 mV.

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