Activation of persulfate with vanadium species for PCBs degradation: A mechanistic study

Fang, Guodong; Wu, Wenhui; Liu, Cun; Dionysiou, Dionysios D.; Deng, Yamei; Zhou, Dongmei

doi:10.1016/j.apcatb.2016.09.006

Cited by 183 publications

(40 citation statements)

References 59 publications

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“…Although increased oxidant concentrations will expectedly generate more radicals, i.e., SO 4 • − and OH•, this may be counterbalanced by a stronger competitive adsorption between SMX and SPS for the biochar's active sites. Furthermore, radicals in excess may suffer partial scavenging and be converted to less reactive species, such as S 2 O 8 • − and O 2 [39].…”

Section: Adsorption Capacitymentioning

confidence: 99%

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

et al. 2019

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Biochars from spent olive stones were tested for the degradation of sulfamethoxazole (SMX) in water matrices. Batch degradation experiments were performed using sodium persulfate (SPS) as the source of radicals in the range 250–1500 mg/L, with biochar as the SPS activator in the range 100–300 mg/L and SMX as the model micro-pollutant in the range 250–2000 μg/L. Ultrapure water (UPW), bottled water (BW), and secondary treated wastewater (WW) were employed as the water matrix. Removal of SMX by adsorption only was moderate and favored at acidic conditions, while SPS alone did not practically oxidize SMX. At these conditions, biochar was capable of activating SPS and, consequently, of degrading SMX, with the pseudo-first order rate increasing with increasing biochar and oxidant concentration and decreasing SMX concentration. Experiments in BW or UPW spiked with various anions showed little or no effect on degradation. Similar experiments in WW resulted in a rate reduction of about 30%, and this was attributed to the competitive consumption of reactive radicals by non-target water constituents. Experiments with methanol and t-butanol at excessive concentrations resulted in partial but generally not complete inhibition of degradation; this indicates that, besides the liquid bulk, reactions may also occur close to or on the biochar surface.

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Section: Adsorption Capacitymentioning

confidence: 99%

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

et al. 2019

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“…The concentration of SPS was chosen to be 1000 mg/L, because higher concentrations had no significant positive effect on the degradation of SMX, while lower concentrations of SPS resulted in lower degradation. Although increased oxidant concentrations will expectedly generate more radicals, these radicals in excess may suffer from partial scavenging and be converted to less reactive species [30]. In addition, higher concentrations of SPS will increase the sulfate ions on the water matrix, which is not desirable.…”

Section: Catalytic Activitymentioning

confidence: 99%

The Influence of Preparation Method on the Physicochemical Characteristics and Catalytic Activity of Co/TiO2 Catalysts

Vakros

2020

Catalysts

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Two Co/TiO2 catalysts with 7% CoO/g loading were prepared using equilibrium deposition filtration and the dry impregnation method. The two catalysts were characterized with various physicochemical techniques and tested for the degradation of sulfamethaxazole (SMX) using sodium persulfate (SPS) as the oxidant. It was found that the two catalysts exhibit different physicochemical characteristics. The equilibrium deposition filtration (EDF) catalyst had a higher dispersion of cobalt phase, more easily reduced Co(III) species, and a higher ratio of Co(III)/Co(II) species. The interactions between Co-deposited species and the titania surface were monitored with diffuse reflectance spectroscopy in all the preparation steps, and it was found that they increased during drying and calcination, while EDF favored the formation of surface species with strong interactions with the support. Finally, the EDF catalyst was more active for the degradation of sulfamethaxazole due to its better physicochemical characteristics.

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“…Persulfate salts have attracted considerable attention in recent years as an in-situ oxidizing agent [23–26]. The persulfate ion has a reduction potential of 2.1 V (E O S 2 O 8 2− |SO 4 2− ] vs. NHE) and generates sulfate free radicals with a higher reduction potential of 2.4 V (E O SO 4 •- |SO 2− ] vs. NHE).…”

Section: Introductionmentioning

confidence: 99%

“…The persulfate ion has a reduction potential of 2.1 V (E O S 2 O 8 2− |SO 4 2− ] vs. NHE) and generates sulfate free radicals with a higher reduction potential of 2.4 V (E O SO 4 •- |SO 2− ] vs. NHE). Different modes of activation, such as UV light, heat, and transition metals have been investigated for decomposition of persulfate [23, 27]. Thermal fission of –O-O- linkage in the persulfate to generate sulfate free radicals is slow at a lower temperature.…”

Section: Introductionmentioning

confidence: 99%

Naphthenic acids removal from high TDS produced water by persulfate mediated iron oxide functionalized catalytic membrane, and by nanofiltration

Aher

Papp

Colburn

et al. 2017

Chemical Engineering Journal

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Oil industries generate large amounts of produced water containing organic contaminants, such as naphthenic acids (NA) and very high concentrations of inorganic salts. Recovery of potable water from produced water can be highly energy intensive is some cases due to its high salt concentration, and safe discharge is more suitable. Here, we explored catalytic properties of iron oxide (FexOy nanoparticles) functionalized membranes in oxidizing NA from water containing high concentrations of total dissolved solids (TDS) using persulfate as an oxidizing agent. Catalytic decomposition of persulfate by FexOy functionalized membranes followed pseudo-first order kinetics with an apparent activation energy of 18 Kcal/mol. FexOy functionalized membranes were capable of lowering the NA concentrations to less than discharge limits of 10 ppm at 40 °C. Oxidation state of iron during reaction was quantified. Membrane performance was investigated for extended period of time. A coupled process of advanced oxidation catalyzed by membrane and nanofiltration was also evaluated. Commercially available nanofiltration membranes were found capable of retaining NA from water containing high concentrations of dissolved salts. Commercial NF membranes, Dow NF270 (Dow), and NF8 (Nanostone) had NA rejection of 79% and 82%, respectively. Retentate for the nanofiltration was further treated with advanced oxidation catalyzed by FexOy functionalized membrane for removal of NA.

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Activation of persulfate with vanadium species for PCBs degradation: A mechanistic study

Cited by 183 publications

References 59 publications

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

Activation of Persulfate by Biochars from Valorized Olive Stones for the Degradation of Sulfamethoxazole

The Influence of Preparation Method on the Physicochemical Characteristics and Catalytic Activity of Co/TiO2 Catalysts

Naphthenic acids removal from high TDS produced water by persulfate mediated iron oxide functionalized catalytic membrane, and by nanofiltration

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