Active oxygen species generated during chlorination and ozonation

Utsumi, Hideo; Hakoda, M.; Shimbara, Satoko; Nagaoka, Hiroaki; Chung, Youn-Son; Hamada, Akira

doi:10.2166/wst.1994.0451

Cited by 46 publications

(28 citation statements)

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“…6(a), the spectrum was composed of quartet lines having peak height ratio of 1:2:2:1. The ESR parameters coincided with those of typical DMPO-OH adduct [16], and the result confirmed that the quartet signal is DMPO-OH adduct.…”

Section: Esr Analysissupporting

confidence: 70%

Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid

Xiao

Liu

Zhao

et al. 2008

Journal of Molecular Catalysis A: Chemical

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a b s t r a c tManganese catalytic ozonation of 2,4-dinitrotoluene (DNT) in the presence of oxalic acid was studied. The addition of manganese ion (Mn 2+ ) or oxalic acid alone in ozonation process did not enhance DNT degradation, but the addition of Mn 2+ coupled with oxalic acid accelerated degradation of DNT. The DNT degradation efficiency was influenced by carbonate in the catalytic ozonation process. Kinetics study showed that Mn 2+ catalytic ozonation significantly promoted the decomposition of ozone. Experimental results of electron spin resonance (ESR) demonstrated that addition of Mn 2+ and oxalic acid produced much hydroxyl radicals in catalytic ozonation system than that in single ozonation system. These results suggested that catalytic ozonation followed hydroxyl radical-type mechanism. Mn 2+ promoted decomposition of ozone to produce hydroxyl radical and it was oxidized into manganese oxide. Manganese oxide was reduced into Mn 2+ by oxalic acid, which is the key step of catalytic process. Based on above results, a cycle catalytic mechanism of Mn 2+ was proposed. Intermediates were determined by HPLC and GC-MS, and they mainly included aromatic organics and aliphatic carboxylic acids.

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Section: Esr Analysissupporting

confidence: 70%

Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid

Xiao

Liu

Zhao

et al. 2008

Journal of Molecular Catalysis A: Chemical

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“…The spectrum was composed of quartet lines having peak height ratio of 1:2:2:1. The ESR parameters coincided with those of typical DMPO-OH adduct (Utsumi et al, 1994). The signal strength of DMPO-OH adduct represents the amount of Å OH radical to some extent during ozonation.…”

Section: Generation Of Hydroxyl Radicalssupporting

confidence: 63%

Effect of manganese ion on the mineralization of 2,4-dichlorophenol by ozone

et al. 2008

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a b s t r a c tMineralization of 2,4-dichlorophenol (DCP) was studied by ozone with Mn 2+ as an ozonation catalyst.Laboratory scale semi-batch ozonation experiments were conducted at room temperature. The results showed that trace amount of Mn 2+ accelerated the mineralization of DCP. Total organic carbon removal rate was independent on Mn 2+ dosage at its range of 0.1-0.5 mg L À1 . Dissolved ozone concentration in the solution remained low level in the catalytic ozonation process, which indicated that Mn 2+ catalyzed decomposition of ozone. DCP mineralization was inhibited in catalytic ozonation by the addition of carbonate. Electron spin resonance/spin-trapping technique was used to determine hydroxyl radicals, and the results showed that larger amounts of hydroxyl radicals were produced in catalytic ozonation system than those of single ozonation. Intermediates mainly including aliphatic carboxylic acids were determined qualitatively and semi-quantitatively by GC-MS. And, a general pathway for mineralization of DCP was proposed.

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“…In terms of applications to semiconductor manufacturing, ozonized water cleaning systems are strongly desired as they provide enhanced removal rates for organic contaminants. In addition, the challenge to the amorphous carbon like damage layer created by ion-implant doses greater than 5E14/cm 2 is significantly important to introduce the ozone cleaning method in the semiconductor manufacturing processes [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Microbubbles on Ozonized Water for Photoresist Removal

Takahashi

Horibe

Matsuura

et al. 2015

J. Photopol. Sci. Technol.

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The existence of microbubbles in ozonized water has been shown to significantly enhance the photoresist removal rate due to an elevated dissolved ozone concentration and a direct effect of the microbubbles relating to the radical generation. Additionally, the ozone microbubble solution was able to effectively remove a high-dose ion-implanted photoresist, which is extremely resistant to removal by ozonized water and other wet chemicals because of its amorphous carbon-like layer, or "crust". Electron spin resonance experiments were also performed without the influence of serious metal contamination and indicated the presence of hydroxyl radicals, which are thought to be formed by interaction of ozone with hydroxide ions adsorbed at the gas-water interface upon collapse of the microbubbles.

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Active oxygen species generated during chlorination and ozonation

Cited by 46 publications

References 0 publications

Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid

Enhanced degradation of 2,4-dinitrotoluene by ozonation in the presence of manganese(II) and oxalic acid

Effect of manganese ion on the mineralization of 2,4-dichlorophenol by ozone

Effect of Microbubbles on Ozonized Water for Photoresist Removal

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