Effects of humic substances on the decomposition of 2,4-dichlorophenol by ozone after extraction from water into acetic acid through activated carbon

Okawa, Kiyokazu; Nakano, Yoichi; Nishijima, Wataru; Okada, Minoru

doi:10.1016/j.chemosphere.2004.08.009

Cited by 15 publications

(8 citation statements)

References 22 publications

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“…Besides the traditional treatments of humic acids [5][6][7][8], studies of the degradation of HA have been carried out with advanced oxidation processes (AOPs) [9][10][11][12][13], among which the heterogeneous Fenton system has attracted great attention due to its formation of highly potent chemical species, • OH, for non-selective oxidation [14,15]. Zero valent iron has been widely used in different environmental treatment processes [16,17] and the direct electron transfer from Fe 0 to H 2 O 2 during a Fenton reaction is a very slow process at neutral pH [18].…”

Section: Introductionmentioning

confidence: 99%

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Nie

Zhou

et al. 2010

Journal of Hazardous Materials

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a b s t r a c tIron oxides coated on Fe 0 core-shell nanospheres (nIOCI) were synthesized through the reduction of ferrous sulfate aqueous solution by sodium borohydride at ambient atmosphere. The catalyst was highly effective for the degradation of humic acid (HA) in the presence of H 2 O 2 and UVA at neutral pH. Under deoxygenated conditions in the dark, the generation of hydroxyl radicals in aqueous nIOCI dispersion verified its galvanic cell-like performance, which enhanced the interfacial electron transfer and led to its higher reactivity. By the total organic carbon, the absorbance of UV 254 , FTIR, the molecular weight distribution and the chemical fractional character analysis, the degradation process of HA was shown to proceed by the disappearance of aromaticity, the increase of hydrophilic fraction and aromatic ring openings into CO 2 and small organic acid. The treated HA showed much lower reactivity toward chlorine and the disinfection byproduct (DBP) formation potential was also greatly reduced. Moreover, it was found that the DBP formation potential more depended on the structure of the intermediates of HA degradation than TOC removal.Crown

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Section: Introductionmentioning

confidence: 99%

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Nie

Zhou

et al. 2010

Journal of Hazardous Materials

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“…Although the direct reaction of organics with molecular ozone is effectively formed at low pH, the presence of ozone scavengers such as humic substances and carbon dioxide result in a low decomposition rate (Okawa et al 2004). Notable advantage for COD removal under pH 3.0 was not found.…”

Section: Influence Of Initial Phmentioning

confidence: 99%

Optimum Ozone Dosage of Preozonation and Characteristic Change of Refractory Organics in Landfill Leachate

Cui

Xiao

et al. 2014

Ozone: Science & Engineering

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Preozonation on landfill leachate was carried out. COD removal rate has an obvious inflection at ozone dosage 0.186 mg O3 /mg COD in ozonation process. Seven sets of identical O 3 -SBR combined process under different ozone dosages were studied. The results indicated that the best COD removal rate of synergetic effect is also at 0.186 mg O3 /mg COD . New organic substances produced after ozonation was confirmed by an excitation-emission matrix (EEM). Carbon dioxide production increased from 36.3 mg to 75.7 mg after ozonation, confirming that biodegradability of refractory organics in landfill leachate was enhanced. All the arguments indicated that the inflection point of COD removal by ozonation has a great significance for preozonation.

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“…TCE decomposition was enhanced by small addition of humic acid (less than 8 mg C L −1 ) for all solutions and then decreased with the increase in humic acid concentration. The higher humic acid concentration would work as an ozone scavenger [30,31].…”

Section: Tce Decomposition In the Presence Of Humic Acidmentioning

confidence: 99%

Ozonation of trichloroethylene in acetic acid solution with soluble and solid humic acid

Alcántara-Garduño¹,

Okuda²,

Nishijima³

et al. 2008

Journal of Hazardous Materials

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Effects of humic substances on the decomposition of 2,4-dichlorophenol by ozone after extraction from water into acetic acid through activated carbon

Cited by 15 publications

References 22 publications

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Degradation characteristics of humic acid over iron oxides/Fe0 core–shell nanoparticles with UVA/H2O2

Optimum Ozone Dosage of Preozonation and Characteristic Change of Refractory Organics in Landfill Leachate

Ozonation of trichloroethylene in acetic acid solution with soluble and solid humic acid

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