Deleterious effect of homogeneous and heterogeneous near-neutral photo-Fenton system on Escherichia coli. Comparison with photo-catalytic action of TiO2 during cell envelope disruption

Ruales-Lonfat, Cristina; Benítez, Norberto; Sienkiewicz, Andrzej; Pulgarín, C.

doi:10.1016/j.apcatb.2014.05.001

Cited by 70 publications

(35 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Photo-Fenton systems involving solar light have been tested to oxidize azo-dyes [202][203][204][205], pharmaceuticals [206][207][208] and herbicides [209,210]. Also, biological contaminants, including viruses [211] and bacteria [212][213][214], can be eradicated using photo-Fenton systems.…”

Section: Photo-fentonmentioning

confidence: 99%

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Oszajca

Brindell

Orzeł

et al. 2016

Coordination Chemistry Reviews

View full text Add to dashboard Cite

Section: Photo-fentonmentioning

confidence: 99%

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Oszajca

Brindell

Orzeł

et al. 2016

Coordination Chemistry Reviews

View full text Add to dashboard Cite

“…[4] In natural waters, a part of the total iron content is composed of solid iron oxides. [5] Interesting bacterial inactivation rates have been obtained in the laboratory with iron oxides, [6] because of the capability of bacteria to solubilize Fe with the help of siderophores. [7] Siderophores produced by bacteria (enterobactin, aerobactin, and ferrichrome) can chelate iron to manage the Fe 3+ transport inside the cell for its delivery into the cell as Fe 2+ .…”

Section: Enhancement Of Solar Disinfection By Tio 2 Photocatalysismentioning

confidence: 99%

“…However, when Fe 2+,3+ salts are added to the water at neutral pH in the absence of organic complexes such as citrate, most of the iron rapidly precipitates as Fe 3+ (hydr) oxides under the oxidative action of O 2 and H 2 O 2 . [6] In the presence of solar light, Fe 3+ oxides (naturally present, or formed from added Fe salts) can act as i) Fe 3+ source for siderophores, ii) semiconductors able to generate ROS in presence of O 2 and under visible light [5,6] and iii) heterogeneous photocatalyst for photo-Fenton process when ( 1 O 2 ), and hydrogen peroxide (H 2 O 2 ). The first event, after absorption of radiation, is the generation of electron/hole pairs (reaction (5)) separated between the conductance band (CB) and valence band (VB).…”

Section: Enhancement Of Solar Bacteria Inactivation By Addition Of Phmentioning

confidence: 99%

Fe vs. TiO2 Photo-assisted Processes for Enhancing the Solar Inactivation of Bacteria in Water

Pulgarín¹

2015

Chimia

View full text Add to dashboard Cite

Batch solar water disinfection (SODIS) is a known, simple and low-cost water treatment technology. SODIS is based on the synergistic action of temperature increase and light-assisted generation of Reactive Oxygen Species (ROS) on bacteria. ROS are generated via the action of solar photons on i) Natural Organic Matter (NOM), ii) some mineral components of water (Fe oxides or Fe-organic complexes, nitrogen compounds) and iii) endogenous bacteria photosensitizers (e.g. cytochrome). SODIS has proven its effectiveness for remote settlements or urban slums in regions with high incident solar radiation. All of the internal and external simultaneous processes are often driven by photoactive Fe-species present in the cell, as well as in the natural water sources. In SODIS, a temperature of 50 °C is required and due to this temperature dependence, only 1-2 L can be treated at a time. As required exposure time strongly depends on irradiation intensity and temperature, some SODIS households could be overburdened, leading to inadequate treatment and probable bacterial re-growth. This is why TiO(2) photocatalysis and Fe photo-assisted systems (i.e. photo-Fenton reactants) have been considered to enhance the photo-catalytic processes already present in natural water sources when exposed to solar light. Both TiO(2) and Fe-photoassisted processes, when applied to water disinfection aim to improve the performance of solar bacteria inactivation systems by i) enhancing ROS production, ii) making the process independent from the rise in temperature and as a consequence iii) allowing the treatment of larger volumes than 1-2 L of water and iv) prevent bacterial (re)growth, sometimes observed after sole solar treatment.

show abstract

“…The iron (hydr)oxide could act as a semiconductor with a reduce band gap and 299 may be photo active under solar irradiation. Electrons and holes that are photo generated in 300 the iron oxide semiconductor lattice are scavenged by surface sites to produce HO • radicals 301and Fe 2+[53]. These mechanisms give rise to an indirect endogenous damage in the virus.…”

mentioning

confidence: 98%

Principal parameters affecting virus inactivation by the solar photo-Fenton process at neutral pH and μM concentrations of H2O2 and Fe2+/3+

Ortega-Gómez

Martín

Carratalà

et al. 2015

Applied Catalysis B: Environmental

Self Cite

View full text Add to dashboard Cite

Deleterious effect of homogeneous and heterogeneous near-neutral photo-Fenton system on Escherichia coli. Comparison with photo-catalytic action of TiO2 during cell envelope disruption

Cited by 70 publications

References 54 publications

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Mechanistic studies on versatile metal-assisted hydrogen peroxide activation processes for biomedical and environmental incentives

Fe vs. TiO2 Photo-assisted Processes for Enhancing the Solar Inactivation of Bacteria in Water

Principal parameters affecting virus inactivation by the solar photo-Fenton process at neutral pH and μM concentrations of H2O2 and Fe2+/3+

Contact Info

Product

Resources

About