Contrasting the performance of photo-Fenton at neutral pH in the presence of different organic iron-complexes using hydrogen peroxide or persulfate as oxidants for naproxen degradation and removal of antimicrobial activity

Silva, Gizele D.; Marson, Eduardo O.; Batista, Letícia Leandro; Ueira-Vieira, Carlos; Starling, Maria Clara V.M.; Trovó, Alam G.

doi:10.1016/j.psep.2021.01.005

Cited by 24 publications

(23 citation statements)

References 34 publications

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“…In addition, to elucidate the type of radicals responsible for the photodegradation, the photo-Fenton experiments were performed with each of the dye solutions spiked with 50 µL tert-butanol (99.8%, Scharlau), which is an efficient quencher of hydroxyl (HO•) or sulphate (SO 4 • 2− •) radicals [25].…”

Section: Methodsmentioning

confidence: 99%

“…Using an iron-rich support, such as stainless steel, could mitigate the issue of ZVI surface passivation, but the use of stainless steel in photo-Fenton processes is not as widely researched compared to the use of ZVI particles [22,23]. Using persulfate ions to degrade oxidant sulfate radicals for the degradation of the two model dyes in the presence of stainless steel as ZVI at pH values close to 7 has been identified as a gap in the literature [24,25]. pH values close to neutral while generating a lower amount of iron ions in the presence of oxidant species could ensure the reuse and prolonged maintenance of the mechanical properties of the substrate.…”

Section: Introductionmentioning

confidence: 99%

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Austenitic Stainless Steel as a Catalyst Material for Photo-Fenton Degradation of Organic Dyes

et al. 2022

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In this paper, a typical austenitic stainless steel was used as a catalyst in the visible photo-Fenton degradation process of two model dyes, methylene blue and methylorange, in the presence of hydrogen peroxide and potassium persulfate as free radical-generating species. The concentration intervals for both peroxide and persulfate were in the range of 333–1667 μg/L. Very high photodecoloration efficiencies have been achieved using peroxide (>93%), while moderate ones have been achieved using persulfate (>75%) at a pH value of 6.5. For methylene blue, the maximum mineralization yield of 74.5% was achieved using 1665 μg/L of hydrogen peroxide, while methylorange was better mineralized using 999 μg/L of persulfate. The photodegradation of the dye occurred in two distinct steps, which were successfully modeled by the Langmuir–Hinshelwood pseudo-first-order kinetic model. Reaction rate constants k between 0.1 and 4.05 h−1 were observed, comparable to those presented in the reference literature at lower pH values and higher concentrations of total iron from the aqueous media.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Austenitic Stainless Steel as a Catalyst Material for Photo-Fenton Degradation of Organic Dyes

et al. 2022

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“…•− minimizes the parallel reactions with radical scavengers [33]. Even so, in the UVC-LED/Fe 3+ -NTA/S 2 O 8 2− system, complete inactivation of E. coli and more than 80% IMD removal was achieved, requiring slightly more time and a higher UVC dose for IMD removal (Table 1).…”

Section: Simultaneous E Coli Inactivation and Imd Removal By Uvc-led Mediated By Thementioning

confidence: 99%

Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes

Cuevas

Jiménez

Alonso

et al. 2021

Water

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This work presents the comparison of four advanced oxidation processes driven by UVC-LED radiation (278 nm—2 W/m2) for simultaneous bacteria inactivation (Escherichia coli—106 CFU/mL) and microcontaminant removal (imidacloprid—50 µg/L) in simulated wastewater secondary effluent. To this end, the activation of H2O2 and S2O82− as precursors of HO• and SO4•−, respectively, by UVC-LED and UVC-LED/Fe3+–NTA (ferric nitrilotriacetate at 0.1 mM) has been studied at different oxidant concentrations. For the purpose of comparison, conventional chlorination was used as the baseline along with bacterial regrowth 24 h after treatment. Disinfection was achieved within the first 30 min in all of the processes, mainly due to the bactericidal effect of UVC-LED radiation. UVC-LED/H2O2 did not substantially affect imidacloprid removal due to the low HO• generation by UVC irradiation at 278 nm, while more than 80% imidacloprid removal was achieved by the UVC-LED/S2O82−, UVC-LED/Fe3+–NTA/S2O82−, and UVC-LED/Fe3+–NTA/H2O2 processes. The most efficient concentration of both oxidants for the simultaneous disinfection and microcontaminant removal was 1.47 mM. Chlorination was the most effective treatment for bacterial inactivation without imidacloprid removal. These findings are relevant for scaling up UVC-LED photoreactors for tertiary wastewater treatment aimed at removing bacteria and microcontaminants.

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“…Pese a que su reactividad con los radicales hidroxilo es menor que la del complejo Fe(III)-EDDS, el complejo Fe(III)-NTA es capaz de degradar contaminantes en menores tiempos de tratamiento bajo las mismas condiciones y una radiación aplicada de 200 a 530 nm (Zhang et al, 2016). La estabilidad del complejo metal-NTA es menor que la del metal-EDTA (Bucheli-Witschel & Egli, 2001), pero su alta biodegradabilidad y su baja toxicidad en el medio ambiente (Silva et al, 2021) lo convierten en una opción más respetuosa con el mismo. La Figura 1.2.2.3.4.1.3-3 muestra las diferentes especies de Fe(III)-NTA en función del pH.…”

Section: áCido Etilendiaminotetraacético (Edta)unclassified

“…El Fe está en forma de Fe(III) di-oxalato férrico hasta valores de pH de 4, por encima de este valor de pH se forman Fe(OH)3. El oxalato ha sido el ligando más utilizado para la degradación de compuestos orgánicos mediante proceso foto-Fenton, debido a su alta fotosensibilidad y a su alto rendimiento cuántico (Փ=1.24 a 300 nm y pH 2.0) (Silva et al, 2021). Aunque el oxalato es biodegradable y presenta baja toxicidad, el principal problema que presenta este complejo es la elevada relación molar necesaria para que se formen complejos estables, ya que es un complejante débil, lo que supone una adición demasiado alta de COT al sistema convirtiéndolo en un contaminante potencial.…”

Section: Oxalatounclassified

Empleo de sustancias tipo húmicas obtenidas a partir de diferentes residuos orgánicos en la eliminación de contaminantes emergentes

Negueroles¹

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Contrasting the performance of photo-Fenton at neutral pH in the presence of different organic iron-complexes using hydrogen peroxide or persulfate as oxidants for naproxen degradation and removal of antimicrobial activity

Cited by 24 publications

References 34 publications

Austenitic Stainless Steel as a Catalyst Material for Photo-Fenton Degradation of Organic Dyes

Austenitic Stainless Steel as a Catalyst Material for Photo-Fenton Degradation of Organic Dyes

Simultaneous Disinfection and Organic Microcontaminant Removal by UVC-LED-Driven Advanced Oxidation Processes

Empleo de sustancias tipo húmicas obtenidas a partir de diferentes residuos orgánicos en la eliminación de contaminantes emergentes

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