A comprehensive review on the use of second generation TiO2 photocatalysts: Microorganism inactivation

Demirel, Ceyda Senem Uyguner; Birben, Nazmiye Cemre; Bekbölet, Miray

doi:10.1016/j.chemosphere.2018.07.121

Cited by 98 publications

(59 citation statements)

References 250 publications

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“…Disinfection practices still deserve interest for the development of novel photocatalysts with the use of different experimental systems: TiO 2 coating/doping with various metal nanoparticles (NP S ), e.g., Zn, Cu, Pt, Ag, Cd, Mo and Co, and type of irradiation, e.g., visible light [ 15 , 16 ]. The most popular photocatalytic compound for textile applications among other semi-conductor metal oxides is TiO 2 , due to its high stability, high photocatalytic activity and non-toxicity [ 2 , 8 ].…”

Section: Introductionmentioning

confidence: 99%

“…Photocatalysis proceeds via redox reactions generally by predominating oxidative reaction pathways. Besides the degradation of diverse organic and inorganic compounds, mainly dyes, toxic substances and volatile organic compounds (VOCs), an important aspect is microorganism inactivation by photocatalysis [ 16 , 25 ]. Recently, studies on photocatalytic activity have been intensively conducted on a wide spectrum of microorganisms, including many species of viruses (e.g., MS2 phage, RNA bacteriophage and phil164), bacteria (e.g., Escherichia coli , Staphylococcus aureus , Bacillus subtilis , total coliforms, Salmonella sp.…”

Section: Introductionmentioning

confidence: 99%

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Cotton Terry Textiles with Photo- and Bio-Activity in a Model Study and Real Conditions

et al. 2020

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The aim of the study was to assess the photocatalytic (decompose staining particles, K/S values, the color differences, CIE L*a*b* color) and antimicrobial properties of textiles modified with TiO2 and ZnO nanoparticles (NPs) confirmed by X-ray diffraction, dynamic light scattering, SEM-EDX) in visible light conditions. The antimicrobial effectiveness of modified textiles under model conditions has been reported against 5 microorganisms: Staphylococcus aureus, Escherichia coli, Bacillus subtilis, Candida albicans, Aspergillus niger (AATCC Test Method 100-2004). In real conditions in bathrooms, significant biostatic activity was shown on the surface of the modified towels. The number of microorganisms decreased by 1–5 log to the level of 0–5 CFU/cm2 in the case of bacteria: Enterobacteriaceae, Enterococcus, the coli group and E. coli, Pseudomonas. Statistically significant reduction of the total number of bacteria and fungi (by 1 log), and the concentration of gases (NO2, CO2, CO) in the air of bathrooms was determined. The removal or reduction of volatile organic compounds (VOCs) concentration (SPME-GC-MS analysis) in the air above the modified towels has also been determined. It was found that the lighting type (natural, artificial), time (1.5 and 7 h/day), air humidity (RH = 36–67%) and light intensity (81–167 lux) are important for the efficiency of photocatalysis. Textile materials modified with TiO2 and ZnO NPs can be used as self-cleaning towels. They can also help purify air from microorganisms, VOCs and undesirable gases.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cotton Terry Textiles with Photo- and Bio-Activity in a Model Study and Real Conditions

et al. 2020

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“…Over the past decade, research has been focused on the removal of PhACs, ARG, ARB, and other recalcitrant organic compounds by various emerging technologies, such as photocatalytic degradation, photolysis, anodic oxidation, Fenton’s processes, treatment using nanoparticles, etc. [19] , [24] , [62] , [163] , [164] , [165] , [166] . These systems have been highly efficient in removing HWW specific contaminants and can be up-scaled for in-situ treatment of hospital effluents.…”

Section: Emerging Technologies For Removal Of Phacs and Various Pathomentioning

confidence: 99%

“…(2013) using different photocatalyst in presence of UV irradiation [176] , [177] . The properties of photocatalysts to simultaneously degrade PhACs and oxidize microorganisms make the process a lucrative option that can be up-scaled for HWW management [164] .…”

Section: Emerging Technologies For Removal Of Phacs and Various Pathomentioning

confidence: 99%

A review on hospital wastewater treatment: A special emphasis on occurrence and removal of pharmaceutically active compounds, resistant microorganisms, and SARS-CoV-2

Majumder

Gupta

Ghosal

et al. 2021

Journal of Environmental Chemical Engineering

184

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“…TiO 2 is a semiconductor employed in disinfection processes. [3][4][5][6][7][8][9] The disinfection mechanism involves the production of reactive oxygen species (ROS), under UV light, through oxidation and reduction reactions by holes (h + ) and electrons (e À ) in the valence and conduction bands of TiO 2 , respectively. The main ROS produced are superoxide radical anion (O 2 c À ), singlet oxygen ( 1 O 2 ), hydroxyl radical ($OH) and hydrogen peroxide (H 2 O 2 ).…”

Section: Introductionmentioning

confidence: 99%

Goethite–titania composite: disinfection mechanism under UV and visible light

et al. 2019

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Goethite-titania (a-FeOOH-TiO 2 ) composites were prepared by co-precipitation and mechanical milling.The structural, morphological and optical properties of as-synthesized composites were characterized by X-ray powder diffraction, scanning electron microscopy and UV-Vis diffuse reflectance spectroscopy, respectively. a-FeOOH-TiO 2 composites and TiO 2 -P25, as reference, were evaluated as photocatalysts for the disinfection of Escherichia coli under UV or visible light in a stirred tank reactor. a-FeOOH-TiO 2 exhibited better photocatalytic activity in the visible region than TiO 2 -P25. The mechanical activation increased the absorption in the visible range of TiO 2 -P25 and the photocatalytic activity of a-FeOOH-TiO 2 . In the experiments with UV light and a-FeOOH-TiO 2 , mechanically activated, a 5.4 log-reduction of bacteria was achieved after 240 min of treatment. Using visible light the a-FeOOH-TiO 2 and the TiO 2 -P25 showed a 3.1 and a 0.7 log-reductions at 240 min, respectively. The disinfection mechanism was studied by ROS detection and scavenger experiments, demonstrating that the main ROS produced in the disinfection process were superoxide radical anion, singlet oxygen and hydroxyl radical.

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A comprehensive review on the use of second generation TiO2 photocatalysts: Microorganism inactivation

Cited by 98 publications

References 250 publications

Cotton Terry Textiles with Photo- and Bio-Activity in a Model Study and Real Conditions

Cotton Terry Textiles with Photo- and Bio-Activity in a Model Study and Real Conditions

A review on hospital wastewater treatment: A special emphasis on occurrence and removal of pharmaceutically active compounds, resistant microorganisms, and SARS-CoV-2

Goethite–titania composite: disinfection mechanism under UV and visible light

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