Thermally activated peroxydisulfate in the presence of additives: A clean method for the degradation of pollutants

Mora, Verónica C.; Rosso, Janina A.; Roux, G.; Mártire, Daniel O.; González, Mónica C.

doi:10.1016/j.chemosphere.2009.02.038

Cited by 91 publications

(48 citation statements)

References 22 publications

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“…1. It is in agreement with the results reported by Mora et al who studied the degradation of trichloroacetic acid by the thermal activation of PS in the presence of sodium formate, and concluded that the decay of trichloroacetic acid and initial formation of Cl -followed zero order rate kinetics [17]. The addition of FA to the solution can change the oxidative capacity of the reactive mixture into a reductive one, since CO -2 $ can transfer an electron rapidly to quinones, nitro and nitroso compounds, pyridinium and viologen ions, porphyrins, oxygen, and many other organic and inorganic compounds [21].…”

Section: Resultssupporting

confidence: 92%

“…(11) is 2.8 [28], therefore CT degradations at the initial pH 6 and 9 were higher than those at pH 3 and unadjusted pH groups. Mora et al also found that trichloroacetic acid degraded faster in pH 6-7 than pH 3-4 in the thermally activated PS system in the presence of formate [17].…”

Section: Effect Of Initial Solution Ph On Ct Degradation Performancementioning

confidence: 93%

“…Thermally activated PS system has been demonstrated to effectively degrade the toxic trichloroethane and trichloroethylene [4,16], and the addition of formate to the thermally activated PS system has been successfully applied to degrade trichloroacetic acid [17]. To our best knowledge, the performance of perchlorinated hydrocarbons reduction in the thermally activated PS system in the presence of formic acid (FA) has never been studied, and it is expected that thermally activated PS system in the presence of FA may generate more reductive radicals that can degrade CT efficiently.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Miao

et al. 2015

Front. Environ. Sci. Eng.

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The thermally activated persulfate (PS) degradation of carbon tetrachloride (CT) in the presence of formic acid (FA) was investigated. The results indicated that CT degradation followed a zero order kinetic model, and CO -2 $ was responsible for the degradation of CT confirmed by radical scavenger tests. CT degradation rate increased with increasing PS or FA dosage, and the initial CT had no effect on CT degradation rate. However, the initial solution pH had effect on the degradation of CT, and the best CT degradation occurred at initial pH 6. Clhad a negative effect on CT degradation, and high concentration of Cl -displayed much strong inhibition. Ten mmol$L -1 HCO -3 promoted CT degradation, while 100 mmol$L -1 NO -3 inhibited the degradation of CT, but SO 2 -4 promoted CT degradation in the presence of FA. The measured Cl -concentration released into solution along with CT degradation was 75.8% of the total theoretical dechlorination yield, but no chlorinated intermediates were detected. The split of C-Cl was proposed as the possible reaction pathways in CT degradation. In conclusion, this study strongly demonstrated that the thermally activated PS system in the presence of FA is a promising technique in in situ chemical oxidation (ISCO) remediation for CT contaminated site.

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Section: Resultssupporting

confidence: 92%

Section: Effect Of Initial Solution Ph On Ct Degradation Performancementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Miao

et al. 2015

Front. Environ. Sci. Eng.

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“…SO 4 Á-can be produced from activation of persulfate (PS) salts by different methods, such as heat (Eq. 1) (Johnson et al 2008;Mora et al 2009), transition metals (Eq. 2) (Anipsitakis and Dionysiou 2004;Tan et al 2012a, b), ultraviolet light (Eq.…”

Section: Introductionmentioning

confidence: 99%

Zero-valent iron/persulfate(Fe0/PS) oxidation acetaminophen in water

Deng

Shao

Gao

et al. 2013

Int. J. Environ. Sci. Technol.

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“…The sulfate radical is said to have a higher oxidative potential than other reactive species such as the oxygen radical and ozone and peroxodisulfate ions [10][11][12][13][14]. Many researchers have already carried out studies on the decomposition of various organic and halogenated compounds by sulfate radicals generated from S 2 O 8 2-using various activation methods [15][16][17][18][19][20][21][22]. For example, Huang et al [17] investigated the degradation of 59 volatile organic compounds (VOCs) with thermally activated sodium persulfate at temperatures of 293-313 K. They reported that halogenated alkanes had a relatively high resistance to persulfate oxidation, and that the degradation rate increased with temperature and oxidant concentration.…”

Section: Introductionmentioning

confidence: 99%

Enhanced decomposition of (4-chloro-2-methylphenoxy) acetic acid by combined ultrasonic and oxidative treatment

Kubota

Hayashi

Matsuda

et al. 2012

J Mater Cycles Waste Manag

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Combined ultrasonic (US) irradiation and sodium peroxodisulfate (Na 2 S 2 O 8 ) treatment has been investigated for promotion of both decomposition of (4-chloro-2-methylphenoxy) acetic acid (MCPA) and mineralization of organic residues. This treatment is expected to accelerate both reactions, because the US cavitation effect promotes the production of radicals, such as SO 4 -Á and OHÁ, by the decomposition of Na 2 S 2 O 8 and water. In this study, decomposition experiments were performed on 100 ppm MCPA aqueous solutions in a sonoreactor at reaction temperatures of 298-333 K with US irradiation alone, Na 2 S 2 O 8 treatment alone, and the combination of US and Na 2 S 2 O 8 treatment. It was found that the combined treatment achieved a higher MCPA decomposition rate and total organic carbon (TOC) removal ratio than either treatment alone. The decomposition ratios of both MCPA and TOC increased with reaction temperature, and especially steep increases were observed at 333 K due to a significant promotion of thermal decomposition of Na 2 S 2 O 8 . The production of radical species was also promoted by the combined treatment. These results suggest that the higher MCPA decomposition rate and TOC removal ratio are due to the increased formation of sulfate and hydroxyl radicals via thermal and US decomposition of Na 2 S 2 O 8 .

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Thermally activated peroxydisulfate in the presence of additives: A clean method for the degradation of pollutants

Cited by 91 publications

References 22 publications

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

Zero-valent iron/persulfate(Fe0/PS) oxidation acetaminophen in water

Enhanced decomposition of (4-chloro-2-methylphenoxy) acetic acid by combined ultrasonic and oxidative treatment

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