Roles of different intermediate active species in the mineralization reactions of phenolic pollutants under a UV-A/C photo-Fenton process

Monteagudo, J.M.; Durán, A.; Martín, I. San; Carnicer, A.

doi:10.1016/j.apcatb.2011.05.034

Cited by 22 publications

(25 citation statements)

References 16 publications

(24 reference statements)

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“…In order to identify the reactive oxygen species generated during the reaction, probe tests were conducted in accordance with TCE degradation procedure except TCE was instead of by NB (hydroxyl radical, Å OH) [11,34], AN ( Å OH and Å SO 4 À ) [11,34] or CT (superoxide radical anions, O 2 ÀÅ ) [35], which was recommended by Ahmad et al [15] To further evaluate the contribution of the reactive oxygen species to TCE degradation, the radical scavengers TBA ( Å OH scavenger, but not Å SO 4 À ), IPA ( Å OH and Å SO 4 À scavenger) [11] and BQ (O 2 ÀÅ scavenger) [36] had been applied in the experiments.…”

Section: Methodsmentioning

confidence: 99%

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Degradation of trichloroethylene in aqueous solution by persulfate activated with citric acid chelated ferrous ion

et al. 2014

Chemical Engineering Journal

158

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Section: Methodsmentioning

confidence: 99%

“…Meanwhile, 1,4-benzoquinone (BQ) is a scavenger of O 2 ÀÅ through rapid electron transfer to generate benzoquinone radicals according to Eq. (9) [36]:…”

Section: Scavenger Tests In Ps/fe(ii)/ca/tce Systemmentioning

confidence: 99%

Degradation of trichloroethylene in aqueous solution by persulfate activated with citric acid chelated ferrous ion

et al. 2014

Chemical Engineering Journal

158

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“…Owing to the high rate constants with •OH (k = 1.9 × 10 9 M −1 s −1 ) and •SO 4 − radicals (k = 8.2 × 10 7 M −1 s −1 ), IPA was chosen as the scavenger for both •OH and •SO 4 − radicals. In addition, BQ was selected as the scavenger of O 2 − • radical with its rapid electron transfer to generate benzoquinone radical …”

Section: Resultsmentioning

confidence: 99%

“…In addition, BQ was selected as the scavenger of O 2 − • radical with its rapid electron transfer to generate benzoquinone radical. 49 Based on the properties of the scavengers, •OH and O 2 − • radicals generated in the + PS/Fe(II)/HA system could be identified with the addition of excess TBA (250 mmol L −1 ) and BQ (25 mmol L −1 ), respectively; while •SO 4 − radical could also be determined by comparing the difference between PCE removal efficiency with the introduction of excess IPA (250 mmol L −1 ) and TBA (250 mmol L −1 ). Figure 4 reveals the suppressive effects on PCE degradation of the addition of •OH radical scavenger TBA, the combined •OH and •SO 4 − radicals scavenger IPA, and O 2 − • radical quencher BQ in the + PS/Fe(II)/HA system.…”

Section: Wileyonlinelibrarycom/jctbmentioning

confidence: 99%

Accelerated degradation of tetrachloroethylene by Fe(II) activated persulfate process with hydroxylamine for enhancing Fe(II) regeneration

et al. 2015

J. Chem. Technol. Biotechnol.

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BACKGROUND The addition of hydroxylamine (HA) could significantly moderate the accumulation of Fe(III) and accelerate the transformation from Fe(III) to Fe(II) and therefore improve the generation of the reactive oxygen species for tetrachloroethylene (PCE) contaminated groundwater remediation in Fe(II)‐activated persulfate (PS) systems. RESULTS Results indicated that PCE could be completely degraded within 30 min in a PS/Fe(II)/HA system with PS/Fe(II)/HA/PCE molar ratio 30:4:20:1 at an initial PCE concentration of 0.15 mmol L−1. A wider effective pH range and a much higher PCE degradation efficiency was achieved with the addition of HA, and optimal PCE removal was observed at an initial solution pH of 3.0, whereas a proper HA dosage was needed in practical applications since too low or too high HA concentrations adversely affected PCE removal. Moreover, radical scavenger experiments and probe compound tests clearly demonstrated that the primary reactive oxygen species generated in the PS/Fe(II)/HA process were •OH, •SO4− and O2−• radicals. Study of the PCE degradation mechanism confirmed that PCE could be completely dechlorinated and that no volatile organic intermediate chlorinated products were detected in the PS/Fe(II)/HA system. CONCLUSION This study provided a novel technique relying on a PS/Fe(II)/HA process for fast remediation of PCE‐contaminated groundwater. © 2015 Society of Chemical Industry

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“…Although Activated persulfate oxidation processes (PS-AOPs) have received a growing attention to treat a wide range of contaminants in water [7,8]. In these processes, persulfate anion (S2O8 2-) is usually activated by thermal [9], alkaline [10], UVC [11] or transition metal [12][13][14] to form sulfate radical (SO4 -), which has high oxidation-reduction potential (SO4 •-/ SO4 2-, E o = 2.6-3.2 V vs NHE). One of the most common activators of persulfate (PS) includes Fe under different forms, e.g.…”

Section: Introductionmentioning

confidence: 99%

Activation of persulfate by irradiated laterite for removal of fluoroquinolones in multi-component systems

Kamagaté

Assadi

Koné

et al. 2018

Journal of Hazardous Materials

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Although several emerging contaminants (e.g. fluoro(quinolones) (FQs)) have been simultaneously detected in environmental systems, there is very limited information on their elimination from contaminated waters in multi-component systems. In this study, removal of three FQs including flumequine (FLU), ciprofloxacin (CIP) and norfloxacin (NOR) were investigated in single and mixture systems, using natural laterite soil and persulfate (PS) under UVA irradiation. Both sorption and oxidation reactions contribute to the removal of FQs from aqueous phase, whereas quenching experiments showed that SO is mainly responsible for the FQs oxidation. The kinetic rate constants can be ranked as follows: CIP > NOR > FLU, regardless of whether the compound was alone or in mixture. The higher degradation rate constant of CIP relative to those of NOR and FLU could be explained by the high reactivity of SO radical with cyclopropane-ring containing compounds. Fall in oxidation performance was observed in synthetic wastewater, probably due to sulfate radical scavenging by wastewater components. However, degradation rate constants of CIP in wastewater remains unchanged in mixture systems as compared to single ones. This environmentally friendly remediation technology may appear as a promising way for the removal of fluoroquinolone antibiotics from multi-contaminated waters.

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Roles of different intermediate active species in the mineralization reactions of phenolic pollutants under a UV-A/C photo-Fenton process

Cited by 22 publications

References 16 publications

Degradation of trichloroethylene in aqueous solution by persulfate activated with citric acid chelated ferrous ion

Degradation of trichloroethylene in aqueous solution by persulfate activated with citric acid chelated ferrous ion

Accelerated degradation of tetrachloroethylene by Fe(II) activated persulfate process with hydroxylamine for enhancing Fe(II) regeneration

Activation of persulfate by irradiated laterite for removal of fluoroquinolones in multi-component systems

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