Effect of iron salt counter ion in dose–response curves for inactivation of Fusarium solani in water through solar driven Fenton-like processes

Aurioles-López, Verónica; Polo-López, María Inmaculada; Fernández‐Ibáñez, Pilar; López‐Malo, Aurelio; Bandala, Erick R.

doi:10.1016/j.pce.2015.10.006

Cited by 14 publications

(1 citation statement)

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“…AOPs have been tested for their ability to inactivate several different pathogens (Bandala et al, 2011a,c). In particular, Fenton and Fenton-like processes have been identified as effective alternatives for inactivating highly resistant microorganisms (Aurioles et al, 2015;Bandala et al, 2011b;Bandala et al, 2012). Bacillus subtilis spores are highly resistant to a wide variety of stressing conditions-such as toxic chemicals, high pressure and temperature, UV, and ionizing radiation-which make them useful test microorganisms for photocatalytic disinfection processes (Bandala and Raichle, 2013) and a conservative water-disinfection model (Bandala et al, 2011b;Guisar et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic inactivation of highly resistant microorganisms in water: A kinetic approach

Huesca-Espitia

Aurioles-López

Ramirez

et al. 2017

Journal of Photochemistry and Photobiology A: Chemistry

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The mechanism for the photocatalytic inactivation of highly resistant microorganisms (i.e., Bacillus subtilis spores) in water was studied using a kinetic approach. This required characterizing the basic processes that occur within the photoreactor. The radiative intensity that entered the photocatalytic system was estimated using the ferrioxalate actinometrical process, the amount of hydroxyl radical produced under a specific photo-assisted Fenton reaction was measured, and a kinetic model to predict the hydroxyl radical generation was proposed to fit the experimental values. These results were then used to suggest new assessment related to the spore inactivation mechanism under controlled photo Fenton reaction conditions. The kinetic model was found to fit the experimental data fairly well (r 2 >0.99) and hydroxyl radical generation was determined to significantly affect the inactivation process. It was determined that a specific amount of hydroxyl radical is required to overwhelm the self-repairing mechanisms of the cell and cause cell death. The amount of hydroxyl radicals generated was found to be a function of radiative intensity and reagent concentration, as previously reported. The proposed relationship between the amount of hydroxyl radical and the inactivation process was supported by adding chloride ions to acting as radical scavengers. It was observed that even the lowest chloride ion concentration was capable of producing a significant delay in the inactivation process by scavenging hydroxyl radicals and generating low reactive species at the pH conditions tested.

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