Acid Catalysis in Reaction of Ozone with Chloride Ions

Леванов, А. В.; Kuskov, I. V.; Zosimov, A. V.; Antipenko, E. E.; Лунин, В. В.

doi:10.1023/b:kica.0000009047.90252.2d

Cited by 54 publications

(62 citation statements)

References 7 publications

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“…More recent works confirm the second order rate constant for this reaction as well as the catalytic effect of the H + . [31][32][33] Levanov et al 32,33 proposed the mechanism indicated by reactions B-D for this system. Siddiqui suggested that hypochlorite could react with ozone generating chloride and chlorite ions.…”

Section: Reaction Between Chloride Ion and Ozonementioning

confidence: 84%

“…Siddiqui suggested that hypochlorite could react with ozone generating chloride and chlorite ions. In addition, chlorite ion could also react with O 3 and produces chlorate ion by pathway shown in reactions E to G. 34 Levanov et al 32,33 suggested that Cl 2 formation and its release into a gas phase result from a rapidly established equilibrium. Unfortunately it is very difficult to identify chlorine gas in the presence of the ozone, especially at low reactants concentration used.…”

Section: Reaction Between Chloride Ion and Ozonementioning

confidence: 99%

See 1 more Smart Citation

Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Paprocki¹,

Santos²,

Hammerschitt³

et al. 2010

J. Braz. Chem. Soc.

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O objetivo deste estudo é determinar a cinética degradação do corante Acid Black 1 por ação oxidante do ozônio e avaliar a influência da contaminação de íons cloreto na degradação deste corante. Foram observadas cinéticas de pseudo-primeira ordem, tanto para a degradação das estruturas cromóforas (620 nm), quanto das aromáticas (321 nm). A completa remoção da coloração foi verificada em 25 min ([corante] 0 = 1,8 × 10 -5 mol L -1 ), enquanto que as estruturas aromáticas foram degradadas com menor velocidade. A presença de íon cloreto, principal impureza do reagente sólido, influencia significantemente a velocidade de ozonização (-42%), mesmo em baixa concentração (5,6 × 10 -4 mol L -1 ). O mecanismo mais provável para o efeito supressor do íon cloreto envolve a direta reação entre O 3 e Cl -gerando HOCl, dentre outros subprodutos. Apesar deste aspecto, a ozonização pode ser um processo de degradação competitivo para este corante.The aim of this study is to determine the kinetics of the Acid Black 1 dye by oxidizing action of ozone and to evaluate the influence of chloride ion contamination on the dye degradation. Pseudofirst order kinetics was observed for both decolorization (620 nm) and aromatic structure (321 nm) degradations. A complete color removal was verified in 25 min ([dye] 0 = 1.8 × 10 -5 mol L -1 ), while aromatic structures degraded at slower rates. The presence of chloride ion, the principal impurity of the solid dye reagents, influences significantly the ozonation rate (-42%), even at low chloride concentration (5.6 × 10 -4 mol L -1 ). The most probable mechanism for the chloride suppression effect involves a direct reaction between O 3 and Cl -generating HOCl, among other by-products. In despite of that, ozonation could be a competitive degradation process for this dye.

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Section: Reaction Between Chloride Ion and Ozonementioning

confidence: 84%

Section: Reaction Between Chloride Ion and Ozonementioning

confidence: 99%

Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Paprocki¹,

Santos²,

Hammerschitt³

et al. 2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…Although literature about the reaction between O 3 , NaCl, and silver is not available, it is known that O 3 can react with chloride ions in an aqueous solution to form Cl 2 , according to Reaction 1. 16 It is likely that the alkaline form of this reaction occurs in the humid environment where the concentration of H + is limited The rate of the reaction forming Cl 2 , Reaction 1 or 5, is dependent on the pH of the solution, the concentration of catalytic ions, 18 the temperature, 19 and the concentration of dissolved ozone. 20 The decomposition of aqueous ozone can generate some OH radicals, but they are not able to oxidize chloride ions unless the pH is very acidic.…”

Section: Discussionmentioning

confidence: 99%

Effects of Sodium Chloride Particles, Ozone, UV, and Relative Humidity on Atmospheric Corrosion of Silver

Liang

Allen²,

Frankel

et al. 2010

J. Electrochem. Soc.

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The corrosion of Ag contaminated with NaCl particles in gaseous environments containing humidity and ozone was investigated. In particular, the effects of relative humidity and UV light illumination were quantitatively analyzed using a coulometric reduction technique. The atmospheric corrosion of Ag was greatly accelerated in the presence of ozone and UV light. Unlike bare Ag ͑i.e., with no NaCl particles on the surface͒, Ag with NaCl exhibited fast corrosion even in the dark, with no UV in the presence of ozone. Samples exposed to different outdoor environments and samples exposed in a salt spray chamber were studied for comparison. Ag corroded at extremely low rates in a salt spray chamber partly because of the combined absence of light and oxidizing agents such as ozone. © 2010 The Electrochemical Society. ͓DOI: 10.1149/1.3310812͔ All rights reserved. Despite their widespread use, the results of accelerated atmospheric corrosion tests such as ASTM B117 often do not correlate well with field exposures.1 As shown below, silver is an example of this phenomenon as silver oxidizes readily during outdoor field exposure but is barely attacked in a salt spray chamber. Clearly, some controlling factors of the chemical and electrochemical reactions in the field exposures are not accurately reproduced in the salt spray chamber environment.Atmospheric corrosion of silver is affected by factors such as relative humidity ͑RH͒, 2-4 airborne pollutants, 5,6 and temperature. Traditional atmospheric corrosion studies of Ag have focused mainly on sulfidation 3,7-9 as silver reacts strongly with sulfurcontaining species. The absence of such species in the ASTM B117 test is one reason why silver is relatively inert in the salt spray environment. However, there has been little focus on the effects of chloride and photoassisted corrosion.In a previous paper, 10 the effects of ozone, UV radiation, and RH on the atmospheric corrosion of bare silver were studied. Atomic oxygen generated by the photolysis of ozone by UV radiation reacted quickly with bare silver to form silver oxide. However, 254 nm UV radiation or ozone alone did not cause any corrosion of Ag within the exposure period. The corrosion rate of bare silver was relatively independent of RH, and it was suggested that the initial chemisorption of atomic oxygen or OH radical under wet conditions is relatively unaffected by RH. The effects of chloride on these reactions are not known. Furthermore, the atmospheric corrosion rate of metals in the field is typically dependent on RH as a result of the interactions of water with salts on the surface. 11Sea-salt aerosols can play a critical role in the atmospheric corrosion process. Cole et al. described marine aerosol formation, chemistry, reaction with atmospheric gases, transport, deposition onto surfaces, and reaction with surface oxides.12 The small size of sea-salt aerosols allows them to be carried away by the wind to places far away from the sea.13 These aerosols are created by physical processes such as the bursting of air...

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“…However, concentration of Cl − ions increases in water with a low pH value, when the acidic water is made from a mixture of the hydrochloric acid in water. The negatively charged chlorine ions also initiate the ozone dissociation in water [16]. But the ozone dissociation by the chlorine ions is considerably less than that due to OH ions, which are the dominant factor of the ozone dissociation in water.…”

Section: Discussionmentioning

confidence: 99%