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

Magioglou, Elena; Frontistis, Zacharias; Vakros, John; Manariotis, Ioannis D.; Mantzavinos, Dionissios

doi:10.3390/catal9050419

Cited by 63 publications

(27 citation statements)

References 44 publications

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“…4. The rational for this set of experiments has to do with the fact that SPS activation to generate extra sulfate and hydroxyl radicals can be implemented by both the carbocatalyst containing iron and cobalt [28][29][30][31] and the action of ultrasound [32]. Indeed, the catalyst seems to activate SPS, thus enhancing MP removal during the silent run; this is consistent with previous findings of our group concerning the removal of bisphenol A by the CX/CoFe-SPS system [20].…”

Section: → + H O H• Ho•supporting

confidence: 85%

Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel

Zanias

Frontistis

Vakros

et al. 2020

Ultrasonics Sonochemistry

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The degradation of methylparaben (MP) through 20 kHz ultrasound coupled with a bimetallic Co-Fe carbon xerogel (CX/CoFe) was investigated in this work. Experiments were performed at actual power densities of 25 and 52 W/L, catalyst loadings of 12.5 and 25 mg/L, MP concentrations between 1 and 4.2 mg/L and initial pH values between 3 and 10 in ultrapure water (UPW). Matrix effects were studied in bottled water (BW) and secondary treated wastewater (WW), as well as in UPW spiked with bicarbonate, chloride or humic acid. The pseudo-first order kinetics of MP degradation increase with power and catalyst loading and decrease with MP concentration and matrix complexity; moreover, the reaction is also favored at near-neutral conditions and in the presence of dissolved oxygen. The contribution of the catalyst is synergistic to the sonochemical degradation of MP and the extent of synergy is quantified to be > 45%. This effect was ascribed to the ability of CX/CoFe to catalyze the dissociation of hydrogen peroxide, formed through water sonolysis, to hydroxyl radicals. Experiments in UPW spiked with an excess of tert-butanol (radical scavenger), sodium dodecyl sulfate or sodium acetate (surfactants) led to substantially decreased rates (i.e. by about 8 times), thus implying that the liquid bulk and the gas-liquid interface are major reaction sites. The stability of CX/CoFe was shown by performing reusability cycles employing magnetic separation of the catalyst after the treatment stage. It was found that the CX/CoFe catalyst can be reused in up to four successive cycles without noteworthy variation of the overall performance of the sonocatalytic process.

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Section: → + H O H• Ho•supporting

confidence: 85%

Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel

Zanias

Frontistis

Vakros

et al. 2020

Ultrasonics Sonochemistry

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“…In order to obtain an insight into the efficacy of the present system towards SMX degradation, Table 1 summarizes the main characteristics of other heterogeneously activated persulfate systems employed for SMX degradation. Magioglou et al [6], who studied the degradation of 0.5 mg/L SMX by biochar-activated persulfate, reported significantly longer time periods for complete SMX degradation than those reported in Figure 3. Alexopoulou et al [14] used Cu 3 P as a heterogeneous persulfate activator.…”

Section: Sps Activationmentioning

confidence: 71%

“…A subcategory of AOPs attracting great scientific interest includes the formation of sulfate radicals (SO •− 4 ) as the main oxidative species, known as sulfate radical-based AOPs (SR-AOPs) [5,6]. The SO •− radicals, probably contribute to effective water decontamination in many systems.…”

Section: Introductionmentioning

confidence: 99%

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

et al. 2020

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In recent years, the presence of pharmaceutically active compounds (PhACs) in surface waters and wastewaters has b the effectiveness of conventional water treatment methods. Towards this direction, advanced oxidation processes (AOPs) for the complete elimination of micro pollutants in waters have become an emerging area of research. The present study reports the heterogeneous activation of sodium persulfate (SPS) by LaNiO3 (LNO) perovskite oxide for the degradation of sulfamethoxazole (SMX), an antibiotic agent. LNO was prepared according to a combustion method, and its physicochemical characteristics were identified by means of XRD, BET, TEM, and SEM/EDS. SMX degradation results showed the great efficiency of LNO for SPS activation. Increasing LNO and SPS dosage up to 250 mg/L enhanced the SMX degradation. In contrast, increasing SMX concentration resulted in longer time periods for its degradation. Considering the pH effect, SMX removal was obstructed under basic conditions, while the efficiency was enhanced at near-neutral conditions. The present system’s activity was also tested for piroxicam (PIR) and methylparaben (MeP) degradation, showing promising results. Unfortunately, experiments conducted in real water matrices such as bottled water (BW) and wastewater (WW), showed that SMX removal was limited to less than 25% in both cases. The hindering effects were mainly attributed to bicarbonate ions and organic matter present in aqueous media. The results obtained using suitable radical scavengers revealed the contribution of both hydroxyl and sulfate radicals in degradation reactions. Finally, LNO exhibited good stability under consecutive experimental runs.

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“…An SMX solution was prepared (150 or 250 µg/L) in ultrapure water (UPW), and the appropriate amounts of SPS (1000 mg/L) and the Co/TiO 2 catalyst (100 mg/L) were added to start the reaction under magnetic stirring and ambient temperature. Samples were periodically withdrawn from the vessel and analyzed by high-performance liquid chromatography (HPLC) using an Alliance HPLC system equipped with a photodiode array detector (Waters 2996), More details about the catalytic experiments and SMX analysis can be found in [37].…”

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

Cited by 63 publications

References 44 publications

Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel

Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel

Lanthanum Nickel Oxide: An Effective Heterogeneous Activator of Sodium Persulfate for Antibiotics Elimination

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

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