Photo-Fenton disinfection at near neutral pH: Process, parameter optimization and recent advances

O’Dowd, Kris; Pillai, Suresh C.

doi:10.1016/j.jece.2020.104063

Cited by 81 publications

(46 citation statements)

References 302 publications

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“…Photo-Fenton reaction is proved to be a promising method for the removal of bacterial and fungal pathogens from wastewater ( O’Dowd and Pillai, 2020 , García-Fernández et al, 2012 ). Also, there are successful reports on the removal of MS2 coliphage (bacteriophage having similar properties to that of human enteric viruses) from wastewater through photo-Fenton treatment ( Nieto-Juarez et al, 2010 , Ortega-Gómez et al, 2015 ).…”

Section: Prospects and Future Directionsmentioning

confidence: 99%

“…However, the heterogeneous photo-Fenton reaction can perform the water treatment at around neutral pH ( Soon and Hameed, 2011 ). So advanced methods, or materials are warranted for performing the reaction at circum-neutral pH ( O’Dowd and Pillai, 2020 ). Therefore, the development of low cost, efficient, visible-light responsive materials for performing the Fenton reaction at around neutral pH is an active area of research in AOPs ( Lv et al, 2010 , Hou et al, 2013 ).…”

Section: Introduction To Photo-fenton Chemistrymentioning

confidence: 99%

“…In the current review, various advanced materials developed for Fenton and photo-Fenton processes are discussed. The readers are redirected to other reviews for a detailed understanding of the reactor design, usage of chelates etc ( O’Dowd and Pillai, 2020 , Ganiyu et al, 2018 , Wang et al, 2016 , Babuponnusami and Muthukumar, 2014 , Clarizia et al, 2017 ) .…”

Section: Introduction To Photo-fenton Chemistrymentioning

confidence: 99%

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Heterogeneous Fenton catalysts: A review of recent advances

Thomas

Dionysiou

Pillai

2021

Journal of Hazardous Materials

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453

162

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Heterogeneous Fenton catalysts are emerging as excellent systems for applications related to water purification. In this review, recent trends in the synthesis and application of heterogeneous Fenton catalysts for the abatement of organic pollutants and disinfection of microorganisms are discussed. It is noted that as the complexity of cell wall increases, the resistance level towards various disinfectants increases and it requires either harsh conditions or longer exposure time for the complete disinfection. In case of viruses, enveloped viruses ( e.g. SARS-CoV-2) are found to be more susceptible to disinfectants than the non-enveloped viruses. The introduction of plasmonic systems with the Fenton catalysts broaden the visible light absorption efficiency of the hybrid material, and incorporation of semiconductor material improves the rate of regeneration of Fe(II) from Fe(III). A special emphasis is given to the use of Fenton catalysts for antibacterial applications. Composite materials of magnetite and ferrites remain a champion in this area because of their easy separation and reuse, owing to their magnetic properties. Iron minerals supported on clay materials, perovskites, carbon materials, zeolites and metal-organic frameworks (MOFs) dramatically increase the catalytic degradation rate of contaminants by providing high surface area, good mechanical stability, and improved electron transfer. Moreover, insights to the zero-valent iron and its capacity to remove a wide range of organic pollutants, heavy metals and bacterial contamination are also discussed. Real world applications and the role of natural organic matter are summarised. Parameter optimisation (e.g. light source, dosage of catalyst, concentration of H 2 O 2 etc. ), sustainable models for the reusability or recyclability of the catalyst and the theoretical understanding and mechanistic aspects of the photo-Fenton process are also explained. Additionally, this review summarises the opportunities and future directions of research in the heterogeneous Fenton catalysis.

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Section: Prospects and Future Directionsmentioning

confidence: 99%

Section: Introduction To Photo-fenton Chemistrymentioning

confidence: 99%

Section: Introduction To Photo-fenton Chemistrymentioning

confidence: 99%

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Heterogeneous Fenton catalysts: A review of recent advances

Thomas

Dionysiou

Pillai

2021

Journal of Hazardous Materials

Self Cite

453

162

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“…In the presence of Fe (III) ions, the so-called Fenton reaction occurs. 41 This reaction produces reactive hydroxyl radicals (OH • ) that can damage the nucleic acids DNA and RNA. 42 Unsaturated fatty acids are susceptible to hydroxyl radical activity, as lipid peroxidation and further formation of free radicals may occur, resulting in loss of cell wall stability and stiffening of cell membranes, eventually leading to cell lysis.…”

Section: Compounds With Disinfectant Properties Compounds With Oxidizmentioning

confidence: 99%

“…42 Unsaturated fatty acids are susceptible to hydroxyl radical activity, as lipid peroxidation and further formation of free radicals may occur, resulting in loss of cell wall stability and stiffening of cell membranes, eventually leading to cell lysis. 41,43 H 2 O 2 used in endodontics in the form of a 3% solution exhibits a bactericidal effect by dissolving organic tissue, but does not damage the periapical tissues of teeth. 11,44 Chlorine Compounds…”

Section: Compounds With Disinfectant Properties Compounds With Oxidizmentioning

confidence: 99%

Disinfectants Used in Stomatology and SARS-CoV-2 Infection

et al. 2021

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Effective disinfection is a basic procedure in medical facilities, including those conducting dental surgeries, where treatments for tissue discontinuity are also performed, as it is an important element of infection prevention. Disinfectants used in dentistry and dental and maxillofacial surgery include both inorganic (hydrogen peroxide, sodium chlorite-hypochlorite) and organic compounds (ethanol, isopropanol, peracetic acid, chlorhexidine, eugenol). Various mechanisms of action of disinfectants have been reported, which include destruction of the structure of bacterial and fungal cell membranes; damage of nucleic acids; denaturation of proteins, which in turn causes inhibition of enzyme activity; loss of cell membrane integrity; and decomposition of cell components. This article discusses the most important examples of substances used as disinfectants in dentistry and presents the mechanisms of their action with particular focus on severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The search was conducted in ScienceDirect, PubMed, and Scopus databases. The interest of scientists in the use of disinfectants in dental practice is constantly growing, which results in the increasing number of publications on disinfection, sterilization, and asepsis. Many disinfectants often possess several of the abovementioned mechanisms of action. In addition, disinfectant preparations used in dental practice either contain one compound or are frequently a mixture of active compounds, which increases their range and effectiveness of antimicrobial action. Currently available information on disinfectants that can be used to prevent SARS-CoV-2 infection in dental practices was summarized.

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