Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends

Malato, Sixto; Fernández‐Ibáñez, Pilar; Maldonado, Manuel I.; Blanco, J.; Gernjak, Wolfgang

doi:10.1016/j.cattod.2009.06.018

Cited by 2,586 publications

(1,507 citation statements)

References 285 publications

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“…These results are in contrast to those previously reported about photocatalytic disinfection of bacteria by semiconductors, such as TiO 2 -based photocatalysts 28 . In those photocatalysts, photogenerated reactive oxygen species (ROS) were believed to be the 'killers' of bacteria, where the cell wall of bacteria adsorbed onto semiconductors could be quickly damaged by ROS through photocatalytic oxidation reactions 29,30 . Because of the short lifetime of ROS, only those microorganisms with an immediate contact with semiconductors are threatened 31 .…”

Section: Discussionmentioning

confidence: 99%

Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Jin

et al. 2012

Nat Commun

132

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Section: Discussionmentioning

confidence: 99%

Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Jin

et al. 2012

Nat Commun

132

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“…This enhanced inactivation could be due to several different processes: (1) the diffusion of H 2 O 2 into the cell and (2) direct attack from H 2 O 2 to the cell membrane. The photolysis process of H 2 O 2 does not play a role in bacterial inactivation because photon absorption of H 2 O 2 is not significant at the wavelength used (l > 290 nm) and the quantum yield is low (Spuhler et al, 2010;Malato et al, 2009). On the other hand, when H 2 O 2 is present in the extracellular medium, its diffusion into the cell is possible since it is a stable and uncharged molecule.…”

Section: E Coli Inactivation In Milli-q Watermentioning

confidence: 99%

Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

et al. 2013

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Fe 2þ and 10 mg L À1 of H 2 O 2 , led to the fastest bacterial inactivation kinetics. Using H 2 O 2 / UV 254 high disinfection rates were obtained similar to those obtained with photo-Fenton under UV 254 light. In Milli-Q water, the rate of inactivation for Escherichia coli was higher than in Leman Lake water and seawater due to the lack of inorganic ions affecting negatively bacteria inactivation. The presence of bicarbonate showed scavenging of the OH radicals generated in the treatment of photo-Fenton and H 2 O 2 /UV 254 . Despite the negative effect of inorganic ions, especially HCO 3 -, the disinfection treatments with AOPs in lake water and seawater improved significantly the disinfection compared to light alone (simulated sunlight and UV 254 ). In the treatment of photo-Fenton with simulated sunlight, dissolved organic matter had a beneficial effect by increasing the rate of inactivation. This is associated with the formation of Fe 3þ -organo photosensitive complexes leading to the formation of ROS able to inactivate bacteria. This effect was not observed in the photo-

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“…Compound oxidation by means of HO  , which also occurs in the environment, may involve several reactions that take place in a non selective way: eletrophilic addition at unsaturated C-C bonds or in aromatic rings (HO  + R → HOR  ), electron transfer (HO  + R → R + + HO -), and hydrogen abstraction at C-H, N-H and O-H bonds (HO  + RH → R  + H 2 O). Additionally, organic radicals generated may react with atmospheric oxygen to form peroxy radicals that generate further oxidative transformations (R  + O 2 → RO 2  → CO 2 + products) that contribute to the complete mineralization of the organic matter (Legrini et al, 1993;Malato et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

Photolytic and photocatalytic transformation of methadone in aqueous solutions under solar irradiation: Kinetics, characterization of major intermediate products and toxicity evaluation

Postigo¹,

Sirtori²,

Oller³

et al. 2011

Water Research

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The present manuscript describes the transformation and mineralization of methadone (MET) in aqueous solutions (demineralized water (DW) and synthetic municipal wastewater effluent (SWeff)) by natural solar irradiation and two solar photocatalytic processes:heterogeneous photocatalysis with titanium dioxide (TiO 2 ) and homogeneous photocatalysis by photo-Fenton. Direct solar irradiation resulted in almost complete transformation of MET in the investigated matrices after 20 hours of normalized irradiation time. MET photocatalytic transformation required shorter illumination times in DW compared to SWeff. Only 16 and 36 minutes of solar illumination were required during photo-Fenton and photocatalysis with TiO 2 , respectively, to transform MET completely in SWeff. Mineralization of the dissolved organic carbon took place only during photocatalytic treatments. Kinetics parameters were calculated for processes comparison. Additionally, phototransformation intermediates generated during each treatment were investigated and characterized by means of ultra-performance liquid chromatography coupled to quadrupole-time of flight tandem mass spectrometry (UPLCQqTOF-MS/MS). The main MET phototransformation pathways were observed to be hydroxylation, and fragmentation and cyclisation. According to the Vibrio fischeri bioassay, the acute toxicity of the generated phototransformation products was not relevant, since the observed inhibition percentages of bacterial bioluminescence were always below 30% after 30 minutes of sample contact.

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Decontamination and disinfection of water by solar photocatalysis: Recent overview and trends

Cited by 2,586 publications

References 285 publications

Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Growth of non-phototrophic microorganisms using solar energy through mineral photocatalysis

Comparative effect of simulated solar light, UV, UV/H2O2 and photo-Fenton treatment (UV–Vis/H2O2/Fe2+,3+) in the Escherichia coli inactivation in artificial seawater

Photolytic and photocatalytic transformation of methadone in aqueous solutions under solar irradiation: Kinetics, characterization of major intermediate products and toxicity evaluation

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