Transition Metal-Catalyzed Oxidation of Sulfur(IV) Oxides. Atmospheric-Relevant Processes and Mechanisms

Brandt, C.; Eldik, Rudi van

doi:10.1021/cr00033a006

Cited by 561 publications

(485 citation statements)

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“…The interference of HA and PMS on the measurement could be ignored at the experimental concentration (Chen et al, 2011;Zou et al, 2013). However, due to the obvious absorption of SMX and its degradation products at 300 nm, methanol was used to consume the reactive radicals (i.e., SO4 (2) (Brandt and Van Eldik, 1995) and the slow transformation from Fe(III) to Fe(II).…”

Section: Role Of Ha In Ha/fe(ii)/pms Processmentioning

confidence: 99%

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Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Liu

Han

et al. 2017

Journal of Hazardous Materials

168

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Fenton or Fenton-like processes have been regarded as feasible methods to degrade a wide variety of contaminants by generating reactive species, but the efficiency is highly affected by the slow transformation from Fe(III) to Fe(II) as well as pH. This study proposed a method by adding hydroxylamine (HA) to the Fe(II)/HSO5 -(Fe(II)/PMS) process to accelerate the degradation of contaminants, selecting a broad-spectrum sulfonamide antibiotic -

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Section: Role Of Ha In Ha/fe(ii)/pms Processmentioning

confidence: 99%

“…•-) could be generated during the catalyst-mediated decomposition of PMS (Brandt and Van Eldik, 1995;Maruthamuthu and Neta, 1977;Zou et al, 2013). Among these radicals, SO4…”

Section: Role Of Reactive Radicals In Ha/fe(ii)/pms Processmentioning

confidence: 99%

Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Liu

Han

et al. 2017

Journal of Hazardous Materials

168

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“…This is not always possible, especially when the concentration of S(IV) is too small (10 -8 -10 -6 mol L -1 ). [36][37][38][39][40] This redox cycling process of metal ion is of interest in atmospheric process, 3,41,42 treatment of gaseous effluents to assist pollution control systems development [43][44][45] and in the DNA and RNA damage by the sulfur oxy radicals. [46][47][48] The synergistic effect due to the combination of two transition metal ion (in the 2+ oxidation state) in an autocatalytic process, with the initiator being the metal ion at trace level in the 3+ oxidation state, followed by a redox cycling, is fascinating and very complex to be fully understood.…”

Section: Discussionmentioning

confidence: 99%

Further studies on the synergistic effect of Ni(II) and Co(II) ions on the sulfite induced autoxidation of Cu(II) penta and hexaglycine complexes

Carvalho¹,

Alipázaga²,

Moreno³

et al. 2007

J. Braz. Chem. Soc.

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A reação de autoxidação dos complexos de Cu(II)/penta e hexaglicina em pH=9 é muito lenta, apresentando um período longo de indução (aproximadamente 4 horas). A presença de S(IV) praticamente não altera a velocidade desta reação. A adição de pequenas quantidades de Ni(II) ou Co(II) aumenta significativamente a velocidade da reação e a eficiência da formação de Cu(III), diminuindo o período de indução para menos de 0,5 s. A constante de velocidade observada para a formação de Cu(III) também depende da concentração de S(IV). A discussão do mecanismo é baseada nas informações disponíveis na literatura e envolve uma cadeia de reações com formação de radicais e um ciclo de oxirredução dos íons metálicos complexados.The autoxidation of Cu(II)/penta and hexaglycine complexes at pH = 9 is very slow showing a large induction period (about 4 h). The presence of S(IV) practically does not affect the rate of this reaction. Addition of small amounts of Ni(II) or Co(II) increases significantly the reaction rate and the effectiveness of Cu(III) formation, the induction period becomes as short as 0.5 s. The observed rate constant for Cu(III) formation also depends on the S(IV) concentration. The mechanism is discussed based on the available literature information and involves a radical chain and redox cycling of the metal ion complexes.

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“…The catalytic activity of transition metal ions in the S(IV) oxidation process has been studied by various researchers (Brandt and van Eldik 1995). Despite the lack of a consensus about which metals are more active catalyzers in this type of reaction, Fe(III) and Mn(II) ions appear to be the strongest candidates, followed by others such as Cu(II), Co(II) and Ni(II) (Martin 1984, Brandt andvan Eldik 1995).…”

Section: Reactions In the Presence Of No 2 And Metal Ionsmentioning

confidence: 99%

“…Despite the lack of a consensus about which metals are more active catalyzers in this type of reaction, Fe(III) and Mn(II) ions appear to be the strongest candidates, followed by others such as Cu(II), Co(II) and Ni(II) (Martin 1984, Brandt andvan Eldik 1995). Studies conducted by Brandt and Elding (1998) and Martins et al (1999) also revealed the catalytic activity of Cr(VI) ions in this type of reaction.…”

Section: Reactions In the Presence Of No 2 And Metal Ionsmentioning

confidence: 99%

Influence of NO2 and metal ions on oxidation of aqueous-phase S(IV) in atmospheric concentrations

Martins

Alves

Carvalho

et al. 2008

An. Acad. Bras. Ciênc.

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An investigation was made of the influence of atmospheric concentrations (15 or 130 ppbv) of NO 2 on the aqueous-phase oxidation rate of S(IV) in the presence and absence of Fe(III), Mn(II) and Cr(VI) metal ions under controlled experimental conditions (pH, T, concentration of reactants, etc.). The reaction rate in the presence of the NO 2 flow was slower than the reaction rate using only clean air with an initial S(IV) concentration of 10 −4 mol/L. NO 2 appears to react with S(IV), producing a kind of inhibitor that slows down the reaction. Conversely, tenfold lower concentrations of S(IV) ([S(IV)] • = 10 −5 mol/L) caused a faster reaction in the presence of NO 2 than the reaction using purified air. Under these conditions, therefore, the equilibrium shifts to sulfate formation. With the addition of Fe(III), Mn(II) or Cr(VI) in the presence of a NO 2 flow, the reaction occurred faster under all the conditions in which S(IV) oxidation was investigated.

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Transition Metal-Catalyzed Oxidation of Sulfur(IV) Oxides. Atmospheric-Relevant Processes and Mechanisms

Cited by 561 publications

References 0 publications

Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Efficient degradation of sulfamethoxazole by the Fe(II)/HSO5− process enhanced by hydroxylamine: Efficiency and mechanism

Further studies on the synergistic effect of Ni(II) and Co(II) ions on the sulfite induced autoxidation of Cu(II) penta and hexaglycine complexes

Influence of NO2 and metal ions on oxidation of aqueous-phase S(IV) in atmospheric concentrations

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