Fe and Cu in humic acid extracts modify bacterial inactivation pathways during solar disinfection and photo-Fenton processes in water

Porras, Jazmín; Giannakis, Stefanos; Torres-Palma, Ricardo A.; Fernández, Jhon J.; Bensimon, M.; Pulgarín, C.

doi:10.1016/j.apcatb.2018.04.062

Cited by 46 publications

(12 citation statements)

References 53 publications

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“…Such variability in the effect exerted by starting DOC would account for the lack of statistical significance of this parameter. Moreover, it is remarkable the close-to-significant effect exerted by the initial DOC on the MS2 inactivation (p-value just slightly over 0.05); it probably suggests that ROS other than just hydroxyl and hydroperoxyl radicals, for instance those promoted by the presence of dissolved NOM under circumneutral pH and natural solar light irradiation (let's say, triplet states of the hydrophobic fraction in NOM) may be are playing a role in the viral inactivation, at least within the range of low levels of DOC featuring real surface waters and peroxide doses here evaluated, as recently reported for bacterial disinfection (Porras et al., 2018).…”

Section: Resultssupporting

confidence: 55%

“…However, in our case it seemingly suggest that NOM on the contrary favored inactivation. Some authors have recently reported that humic substances in water may contribute to inactivation of microorganisms in the presence of solar light acting as precursors of ROS such as superoxide (O 2 - ), singlet oxygen ( 1 O 2 ), and the hydroxyl radical (OH·) which are able to degrade organic compounds and biomolecules (Carratala et al., 2016; Porras et al., 2018). This could be a reasonable explanation for our results considering that all runs were performed under natural solar light irradiation.…”

Section: Resultsmentioning

confidence: 99%

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MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical optimization

Ordoñez-Ordoñez

Revelo-Romo

García-Mora

et al. 2019

Heliyon

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The optimization of the Catalytic Wet Peroxide Oxidation (CWPO) assisted by an Al/Fe-pillared clay (Al/Fe-PILC) was assessed in the inactivation of the MS2 coliphage in the presence of a synthetic surrogate of natural organic matter (NOM). The simultaneous effect of two experimental factors (i) H 2 O 2 dose - (H 2 O 2 ) d (3.00–25.50 % of the H 2 O 2 theoretically required for full mineralization) and (ii) catalyst concentration (0.33–2.60 g/L), and four non-controllable variables (covariates) (a) circumneutral pH (6.00–9.00), (b) temperature (5.00–25.0 °C), (c) synthetic NOM concentration (2.0–20.0 mg C/L) and (d) MS2 titer (10 4 , 10 5 and 10 6 PFU/mL) was investigated by Response Surface Methodology (RSM). Every response was modeled and maximized: (1) MS2 inactivation, (2) fraction of reacted H 2 O 2 , (3) decolourization and (4) NOM mineralization. Multi-response optimization via desirability function based on responses (1) to (3) achieved excellent fitting (0.94 out of 1.0) and following set of optimal experimental conditions: 0.33 g Al/Fe-PILC/L, 3.36 % (H 2 O 2 ) d (Fe active /H 2 O 2 ) = 0.46, giving rise to 92.9 % of MS2 inactivation and 100 % of reacted H 2 O 2 at pH 7.07, 25.0 +/- 0.1 °C, 16.06 mg C/L as starting NOM concentration, and MS2 titer of 10 6 PFU/mL after just 70 min of reaction.

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Section: Resultssupporting

confidence: 55%

Section: Resultsmentioning

confidence: 99%

MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical optimization

Ordoñez-Ordoñez

Revelo-Romo

García-Mora

et al. 2019

Heliyon

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“…498). The master plate and stock solution were prepared according to previous research reported by our laboratory [24,25]. The bacterial concentration of the samples was measured in Colony Forming Units (CFU/mL) and was determined by plating on a non-selective cultivation media, namely, Plate Count Agar (PCA).…”

Section: Photocatalytic Antibacterial Activity On Bi2wo6 and Light Somentioning

confidence: 99%

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Karbasi

Karimzadeh

Raeissi

et al. 2020

Water

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This study addresses the visible light-induced bacterial inactivation kinetics over a Bi2WO6 synthesized catalyst. The systematic investigation was undertaken with Bi2WO6 prepared by the complexation of Bi with acetic acid (carboxylate) leading to a flower-like morphology. The characterization of the as-prepared Bi2WO6 was carried out by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area (SSA), and photoluminescence (PL). Under low intensity solar light (<48 mW/cm2), complete bacterial inactivation was achieved within two hours in the presence of the flower-like Bi2WO6, while under visible light, the synthesized catalyst performed better than commercial TiO2. The in situ interfacial charge transfer and local pH changes between Bi2WO6 and bacteria were monitored during the bacterial inactivation. Furthermore, the reactive oxygen species (ROS) were identified during Escherichia coli inactivation mediated by appropriate scavengers. The ROS tests alongside the morphological characteristics allowed the proposition of the mechanism for bacterial inactivation. Finally, recycling of the catalyst confirmed the stable nature of the catalyst presented in this study.

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“…In previous studies, the organic reductants, such as hydroxylamine, ascorbate and thioglycolic acid, was used to improve the reduction process of Fe III back to Fe II . And quinones and humic acid could also be used as redox mediators which create an intermediate electron‐shuttling cycle between Fe III and H 2 O 2 (electron donor). However, the precise control of these organic reagents in real time may be difficult.…”

Section: Introductionmentioning

confidence: 99%

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

Liu

Fan

Liu

et al. 2019

Applied Organom Chemis

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Excessive consumption of Fe (II) and massive generation of sludge containing Fe (III) from classic Fenton process remains a major obstacle for its poor recycling of Fe (III) to Fe (II). Therefore, the MHACF‐MIL‐101(Cr) system, by introducing H2, Pd0 and MIL‐101(Cr) into Fenton reaction system, was developed at normal temperature and pressure. In this system, the reduction of FeIII back to FeII by solid catalyst Pd/MIL‐101(Cr) for the storage and activation of H2, was accelerated significantly by above 10‐fold and 5‐fold controlled with the H2‐MIL‐101(Cr) system and H2‐Pd0 system, respectively. However, the concentration of Fe (II) generated by the reduction of Fe (III) could not be detected with the only input of H2 and without the addition of MOFs material. In addition, the apparent consumption of Fe (II) in MHACF‐MIL‐101(Cr) system was half of that in classical Fenton system, while more Fe (II) might be reused infinitely in fact. Accordingly, only trace amount of Fe (II) vs H2O2 concentration was needed and hydroxyl radicals through the detection of para‐hydroxybenzoic acid (p‐HBA) as the oxidative product of benzoic acid (BA) by·OH could be continuously generated for the effective degradation of 4‐chlorophenol(4‐CP). The effects of initial pH, concentration of 4‐CP, dosage of Fe2+, H2O2 and Pd/MIL‐101(Cr) catalyst, Pd content and H2 flow were investigated, combined with systematic controlled experiments. Moreover, the robustness and morphology change of Pd/MIL‐101(Cr) were thoroughly analyzed. This study enables better understanding of the H2‐mediated Fenton reaction enhanced by Pd/MIL‐101(Cr) and thus, will shed new light on how to accelerate Fe (III)/Fe (II) redox cycle and develop more efficient Fenton system.

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Fe and Cu in humic acid extracts modify bacterial inactivation pathways during solar disinfection and photo-Fenton processes in water

Cited by 46 publications

References 53 publications

MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical optimization

MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical optimization

Insights into the Photocatalytic Bacterial Inactivation by Flower-Like Bi2WO6 under Solar or Visible Light, Through in Situ Monitoring and Determination of Reactive Oxygen Species (ROS)

Elimination of 4‐chlorophenol in aqueous solution by the Novel Pd/MIL‐101(Cr)‐Hydrogen‐Accelerated catalytic fenton system

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