Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Guerra-Rodríguez, Sonia; Rodríguez, Encarnación; Singh, Devendrá; Rodríguez-Chueca, Jorge

doi:10.3390/w10121828

Cited by 239 publications

(104 citation statements)

References 130 publications

(190 reference statements)

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“…•− ) [41]. The sulfate radical contains significant oxidation potential (E 0 = 2.6 V) in addition to being selective in reactions with organic compounds via electron transfer [42], whereas • OH is non-selective and reacts with various compounds [43][44][45]. Activated persulfate is applied extensively for environmental remediation because the produced radicals react easily with the organic compounds by complete or partial mineralization [46].…”

Section: Introductionmentioning

confidence: 99%

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

2019

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Thermally activated persulfate (TAP) was applied for the degradation of Acid Blue 92 (AB92) dye in its aqueous solution. The effects of pH (3-11), temperature (298-333 K), contact time (15-75 min), sodium persulfate (SPS) concentration (0.05-0.5 mM) and initial AB92 concentration (50-400 mg/L) on the degradation of AB92 using TAP were examined. The initial and residual AB92 concentrations were determined spectrophotometrically at the wavelength of 260 nm and the dye mineralization was examined via the total organic carbon analysis. In addition, the chemical oxygen demand was also measured. The activation energy (E a) of AB92 degradation was calculated as 17.38 kJ mol −1 based on the Arrhenius equation. Maximum degradation efficiency of 86.47% was reached after 75 min of treatment at a pH of 5, AB92 concentration of 200 mg/L, SPS concentration of 0.5 mM and temperature of 333 K. The degradation efficiency declined with the addition of different sodium chloride concentrations and organic radical scavengers. AB92 degradation was reduced from 86.5 to 74%, 65, and 59.1% using ethylenediaminetetraacetic acid, tert-butanol, and ethanol, respectively. A kinetic model was also developed to estimate the pseudo-first-order constants as a function of the main operational parameters (initial dye concentration and TAP concentration). Decolorization rate constants (k) of 0.0009, 0.001, 0.0012, 0.0014, and 0.0018 min −1 were obtained at 303, 308, 313, 328, and 333 K, respectively, using the Langmuir-Hinshelwood kinetic model. The results obtained indicate that the TAP degradation process has great potential for the reduction of azo dyes in aqueous environments.

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Section: Introductionmentioning

confidence: 99%

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

2019

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“…Advanced oxidation processes (AOPs) are promising alternatives for in-situ degradation of organic pollutants [12][13][14]. Persulfate (PS) activation has more advantages because of higher redox potential (E 0 = 2.01 V), stability in subsurface environment, and cost-efficiency [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Persulfate Activation with Pyrite and Zero-Valent Iron for Phthalate Acid Ester Degradation

Imran

Tong

et al. 2020

Water

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Phthalic acid esters (PAEs) are often detected in remediated groundwater using appropriate oxidant materials by in situ groundwater treatment. The study compares zero-valent iron–persulfate with a pyrite–persulfate system to degrade three PAEs—di(2-ethylhexyl) phthalate (DEHP), dibutyl phthalate (DBP), and dimethyl phthalate (DMP). Column experiments were conducted, and rapid oxidation occurred in a pyrite–persulfate system due to sulfate radical generation. DMP concentration was found at about 60.0% and 53.0% with zero-valent iron (ZVI) and pyrite activation of persulfate, respectively. DBP concentration was measured as 25.0–17.2% and 23.2–16.0% using ZVI–persulfate and pyrite–persulfate systems, respectively. However, DEHP was not detected. The total organic carbon concentration lagged behind the Ʃ3 PAEs. Persulfate consumption with ZVI activation was half of the consumption with pyrite activation. Both systems showed a steady release of iron ions. Overall, the oxidation–reduction potential was higher with pyrite activation. The surface morphologies of ZVI and pyrite were investigated using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), and XPS. Intensive corrosion occurs on the pyrite surface, whereas the ZVI surface is covered by a netting of iron oxides. The pyrite surface showed more oxidation and less passivation in comparison with ZVI, which results in more availability of Fe 2 + for persulfate activation. The pyrite–persulfate system is relatively preferred for rapid PAE degradation for contamination.

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“…Persulfate (PS) oxidant has recently been recognized as an essential substitute for hydrogen peroxide (HP) in Fenton processes for the effective removal of pollutants [18,19]. PS can be decomposed to produce sulfate radicals (SO •− 4 ) via an activation process that can efficiently remove pollutants from wastewater [20].…”

Section: Introductionmentioning

confidence: 99%

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

Pervez

Telegin

Cai

et al. 2019

Water

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In this study, a Fenton-activated persulfate (Fe 2+ /PS) system was introduced for the efficient degradation of Mordant Blue 9 (MB 9) as a textile dye in an aqueous solution. Results showed that the degradation of MB 9 was markedly influenced by operational parameters, such as initial pH, PS concentration, Fe 2+ concentration, and initial dye concentration. Optimal reaction conditions were then determined. Inorganic anions, such as Cl − and HCO 3 − , enhanced the degradation efficiency of MB 9 under optimal conditions. Addition of HCO 3 − reduced the degradation performance of MB 9, whereas the addition of Cl − increased the degradation percentage of MB 9. In addition, quenching experiments were conducted using methanol and tert-butyl alcohol as scavengers, and methanol was identified as an effective scavenger. Thus, the degradation of MB 9 was attributed to SO •− 4 and • OH radicals. The degradation and mineralization efficiency of MB 9 was significantly reduced using the conventional Fenton process i.e., Fe 2+ / hydrogen peroxide (HP) because of the formation of a Fe complex during degradation. Meanwhile, the Fe 2+ /persulfate (PS) system improved the degradation and mineralization performance.

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Assessment of Sulfate Radical-Based Advanced Oxidation Processes for Water and Wastewater Treatment: A Review

Cited by 239 publications

References 130 publications

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

The application of thermally activated persulfate for degradation of Acid Blue 92 in aqueous solution

Effects of Persulfate Activation with Pyrite and Zero-Valent Iron for Phthalate Acid Ester Degradation

Efficient Degradation of Mordant Blue 9 Using the Fenton-Activated Persulfate System

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