Stabilization and strong oxidizing properties of Ag(ii) in a fluorine-free solvent

Połczyński, Piotr; Jurczakowski, Rafał; Grochala, Wojciech

doi:10.1039/c3cc43072c

Cited by 41 publications

(45 citation statements)

References 31 publications

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“…The most powerful ROS are hydroxyl radicals (OH • ) that can be formed from photogenerated h + and surface hydroxyl (on photocatalyst) or even water (hydroxide anions). Hydroxyl radicals have a strong redox potential vs. Normal Hydrogen Electrode (NHE) and they react non-selectively and rapidly with most organic substrates (Azenha et al 2013;Edge 2013;Gaya 2014;Hinojosa-Reyes et al 2015;Lazar et al 2012;Polczynski et al 2013;Teoh et al 2012;Wood 1988).…”

Section: Generalities and Principlesmentioning

confidence: 99%

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Monfort

Plesch

2018

Environ Sci Pollut Res

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The number of publications on photocatalytic bismuth vanadate-based materials is constantly increasing. Indeed, bismuth vanadate is gaining stronger interest in the photochemical community since it is a solar-driven photocatalyst. However, the efficiency of BiVO-based photocatalyst under sunlight is questionable: in most of the studies investigating the photodegradation of organic pollutants, only few works identify the by-products and evaluate the real efficiency of BiVO-based materials. This short review aims to (i) present briefly the principles of photocatalysis and define the photocatalytic efficiency and (ii) discuss the formation of reactive species involved in the photocatalytic degradation process of pollutants and thus the corresponding photodegradation mechanism could be determined. All these points are developed in a comprehensive discussion by focusing especially on pure, doped, and composite BiVO. Therefore, this review exhibits a critical overview on different BiVO-based photocatalytic systems with their real efficiency. This is a necessary knowledge for potential implementation of BiVO materials in environmental applications at larger scale than laboratory conditions.

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Section: Generalities and Principlesmentioning

confidence: 99%

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Monfort

Plesch

2018

Environ Sci Pollut Res

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“…•-) can react with a wide range of organic pollutants due to their high redox potential. And the redox potentials vs NHE and in standard conditions of HO • and SO 4 •is 2.7V and 2.6V respectively [12]. ) have a series of advantages, and attract many researches [13].…”

Section: Introductionmentioning

confidence: 99%

UVA-UVB activation of hydrogen peroxide and persulfate for advanced oxidation processes: Efficiency, mechanism and effect of various water constituents

Huang

Bianco

Brigante

et al. 2018

Journal of Hazardous Materials

102

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In the present work we investigate the activation efficiency of HO and SO using UVA and UVB radiation. Bisphenol-A (BPA) is used as model pollutants to estimate the oxidative process efficiency in simulated and real sewage treatment plant waters. Particular attention is paid to the BPA removal efficiency and to the radical mechanism involvement considering the effect of typical inorganic water constituents (carbonates and chloride ions) and organic matter. Despite a detrimental effect observed when carbonate ions are in solution using both hydrogen peroxide and persulafate, the presence of high chloride ions concentration was found to improve BPA removal using SO as radical precursor. This enhancement, investigated combining chemical kinetic model approach and laser flash photolysis experiments, is attributed to the formation of hydroxyl radical and chlorine radical species from sulfate radical. Different transformation products are identified by means of GC-MS and HPLC-MS analyses. Moreover, experiments using sewage treatment plant water (STPW) spiked with BPA are performed in order to assess the efficiency of oxidative processes in a simulated treatment systems activated using UVA + UVB radiations.

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“…AgSO 4 exhibits the largest absolute value of the magnetic superexchange constant among all transition‐metal sulfates, which renders it attractive from the viewpoint of spintronics . Moreover, the Ag II /Ag I redox pair has a standard redox potential of about +2 V versus the normal hydrogen electrode (NHE) (and a formal redox potential of +2.9 V vs. NHE in 30 % oleum solutions), which signals the possible use of AgSO 4 as an anodic material in high‐voltage batteries, similar to its more basic AgO analogue . Recently, some of us discovered a new interesting application of this potent one‐electron oxidizer: rapid AgSO 4 ‐induced generation of organic cation radicals may lead to facile C–H bond activation and the formation of C–C coupled species even at room temperature, during which Ag I HSO 4 is formed as a byproduct…”

Section: Introductionmentioning

confidence: 99%

Efficient Electrosynthesis of Ag^IISO₄: A Powerful Oxidizer and Narrow Band Gap Semiconductor

et al. 2016

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A novel and efficient method for the synthesis of antiferromagnetic silver(II) sulfate, Ag II SO 4 , on a 20 g scale on the basis of electrosynthesis at highly anodic potentials of Ag I HSO 4 solutions in 96 % sulfuric acid is reported. The product does not form at the electrode surface but rather precipitates from a saturated solution of Ag(HSO 4 ) 2 in H 2 SO 4 , and compact crystallites up to 250 μm in length are formed. The yield of electrolysis reaches 75 %. The remaining H 2 SO 4 that wets the crystals of AgSO 4 is rinsed off by using anhydrous HF to yield a [a] 5404The electrochemically prepared dry AgSO 4 was sealed inside FEP tubing and stored inside an argon-filled glove box ( Figure S1). All operations that necessitated sample loading into appropriate airtight containers were conducted inside a glove box. The obtained product was analyzed by SEM and TEM methods, X-ray powder diffraction, thermogravimetric analysis, vibrational spectroscopy, optical reflectance spectroscopy (near-IR-UV/Vis), and impedance spectroscopy (see the Supporting Information).

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Stabilization and strong oxidizing properties of Ag(ii) in a fluorine-free solvent

Abstract: Divalent silver is stabilized in concentrated sulphuric acid and oleums. The formal redox potential of the Ag(II)/Ag(I) redox pair is markedly dependent on the Hammett acidity function and it reaches +2.90 V vs. NHE in 33% oleum thus rivalling E° for the F2/2F(-) redox pair (+2.87 V).

Cited by 41 publications

References 31 publications

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

UVA-UVB activation of hydrogen peroxide and persulfate for advanced oxidation processes: Efficiency, mechanism and effect of various water constituents

Efficient Electrosynthesis of Ag^IISO₄: A Powerful Oxidizer and Narrow Band Gap Semiconductor

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Stabilization and strong oxidizing properties of Ag(ii) in a fluorine-free solvent

Abstract: Divalent silver is stabilized in concentrated sulphuric acid and oleums. The formal redox potential of the Ag(II)/Ag(I) redox pair is markedly dependent on the Hammett acidity function and it reaches +2.90 V vs. NHE in 33% oleum thus rivalling E° for the F2/2F(-) redox pair (+2.87 V).

Cited by 41 publications

References 31 publications

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

Bismuth vanadate-based semiconductor photocatalysts: a short critical review on the efficiency and the mechanism of photodegradation of organic pollutants

UVA-UVB activation of hydrogen peroxide and persulfate for advanced oxidation processes: Efficiency, mechanism and effect of various water constituents

Efficient Electrosynthesis of AgIISO4: A Powerful Oxidizer and Narrow Band Gap Semiconductor

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Efficient Electrosynthesis of Ag^IISO₄: A Powerful Oxidizer and Narrow Band Gap Semiconductor