Mechanism of photocatalytic disinfection using titania-graphene composites under UV and visible irradiation

Cruz-Ortiz, Brenda R.; Hamilton, Jeremy; Pablos, Cristina; Jiménez, Lourdes Díaz; Cortés-Hernández, Dora A.; Sharma, Preetam K.; Castro-Alférez, María; Fernández‐Ibáñez, Pilar; Dunlop, P.S.M.; Byrne, John

doi:10.1016/j.cej.2017.01.094

Cited by 126 publications

(55 citation statements)

References 29 publications

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“…• O 2 − and subsequently generate • OH for the reduction pathway [32,33]. The high photocatalytic bacteriostatic action was attributable to the oxidation of E. coli by…”

Section: Photocatalytic Bacterialmentioning

confidence: 99%

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Rojviroon

Sirivithayapakorn

2018

International Journal of Photoenergy

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This experimental research comparatively investigates the Escherichia coli (E. coli) bacterial inactivation of the TiO 2 photocatalytic thin films fabricated by the sol-gel dip-coating (SG) and low-temperature spray-coating (SP) techniques, with low-intensity (12 μW·cm . Moreover, the essential physical characteristics of the SG-TiO 2 and SP-TiO 2 photocatalytic thin films were determined prior to the experimental bacterial inactivation. The findings showed that both photocatalytic thin films possessed the ideal physical characteristics, especially the SP-TiO 2 thin film. In addition, the viable cell counts, the cell morphology, and the bioluminescence-based adenosine triphosphate (ATP) indicated that both SG-TiO 2 and SP-TiO 2 thin films under UVA could effectively inhibit the proliferation of the E. coli cells in both NB and 0.85% NaCl.

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“…• O 2 − and subsequently generate • OH for the reduction pathway [32,33]. The high photocatalytic bacteriostatic action was attributable to the oxidation of E. coli by…”

Section: Photocatalytic Bacterialmentioning

confidence: 99%

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Rojviroon

Sirivithayapakorn

2018

International Journal of Photoenergy

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“…Cruz‐Ortiz et al investigated the mechanism of inactivation of E. coli using rGO/P25 composites under UV‐visible irradiation. They not only showed that the rGO/P25 composites achieved higher photocatalytic disinfection rates than the bare TiO 2 , but also found that the main ROS produced under UV‐visible irradiation were hydroxyl radical, hydrogen peroxide and singlet oxygen, which were detected in higher amounts in the case of the composite material, whereas the superoxide radical anion was not detected . ROS are known to induce spore death by causing some type of damage to the spores' external layers, principally the inner membrane .…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites

Berberidou

Kyzas

Paspaltsis

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Recombination of photogenerated carriers in titanium dioxide (TiO2)‐mediated semiconducting photocatalysis is considered to be the principal obstacle in its unlimited exploitation in practical applications. Hybridization of TiO2 with graphene‐based materials appears to be a highly promising alternative. In this context, reduced graphene oxide (rGO)/TiO2 composites were prepared using a simple ultrasonically assisted route under mild reaction conditions. RESULTS The as‐prepared composites were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), energy‐dispersive X‐ray spectrometry (EDS), Fourier‐transform infrared spectroscopy (FTIR) and nitrogen adsorption–desorption isotherms. Photocatalytic efficiencies of the as‐prepared composites were evaluated employing the pesticide clopyralid as a model pollutant. Initial degradation and mineralization rates obtained in the presence of the as‐prepared composites were, in all cases, higher than the one obtained in the presence of the bare TiO2, with 5% rGO/TiO2 achieving the highest r0 and rDOC values. The as‐prepared composites also were evaluated based on their potential to inactivate bacterial endospores of the Bacillus stearothermophilus species, well‐known for their extraordinary resistance to most inactivation processes. Prevalence of 5% rGO/TiO2 in the inactivation of B. stearothermophilus among all as‐prepared materials was evident, accomplished within 120 min of UV‐A illumination. Real‐time PCR experiments enabled the detection of genomic DNA released during photocatalytic oxidation, in the presence of 5% rGO/TiO2 and UV‐A, suggesting lysis of the outer and inner spore coat caused by the generated ROS. CONCLUSIONS These findings demonstrate the potential of rGO, a low‐cost, nontoxic material to serve as a reliable alternative in the enhancement of TiO2 photocatalytic efficiency in water processing applications. © 2019 Society of Chemical Industry

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“…The composite thin film showed an improvement in bactericidal activity under solar light compared with bare TiO 2 film. Besides graphene‐TiO 2 film, TiO 2 particles were also anchored on graphene layers via various strategies, like in situ deposition, ultrasonication‐assisted deposition and photocatalytic reduction . For example, Cruz‐Ortiz et al .…”

Section: Graphene‐based Nanocomposites For Photocatalytic Disinfectionmentioning

confidence: 99%

“…(a) Mechanism of photocatalytic generation of RSs on TiO 2 ‐rGO under UV and visible irradiation, and in the presence of chloride; copyright (2017) Elsevier; (b) schematic presentation of self‐assembly of TiO 2 and graphene at the two‐phase interface; copyright (2010) John Wiley and Sons; (c) FESEM images of SGO‐ZnO‐Ag composites, and schematic illustration of the charge transfer route; copyright (2010) Elsevier.…”

Section: Graphene‐based Nanocomposites For Photocatalytic Disinfectionmentioning

confidence: 99%

“…Besides graphene-TiO 2 film, TiO 2 particles were also anchored on graphene layers via various strategies, like in situ deposition, 45 ultrasonication-assisted deposition 46 and photocatalytic reduction. 47 For example, Cruz-Ortiz et al 47 combined commercial TiO 2 nanoparticles, P25, with graphene via UV reduction and studied the photocatalytic mechanism of the P25-rGO composite under both UV and visible light. They found the dominant RSs conducting disinfection under UV-visible light was H 2 O 2 , while only singlet oxygen was detected under visible light irradiation.…”

Section: D-based Photocatalysts For Water Disinfectionmentioning

confidence: 99%

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Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

Liu

Zeng

et al. 2018

J of Chemical Tech & Biotech

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Photocatalysis has received ever‐growing attention as a promising alternative to traditional water treatment technologies for waterborne biohazard inactivation. Due to unique optical, electronic, physicochemical properties and feasibility of functional architecture assembly, two‐dimensional (2D) nanomaterials have become important in developing novel photocatalysts. This review summarizes the recent progress in configuring nanostructures with 2D materials as building blocks for photocatalytic water disinfection. In this review, five categories of 2D nanomaterials, that is, graphene, graphitic carbon nitride, 2D metal oxides and metallates, metal oxyhalides and transition metal dichalcogenides, for photocatalytic pathogen inactivation are introduced. First, the synthesis process, nanostructure engineering and disinfection performance of 2D‐based photocatalysts are reviewed in categories. In the following section, the bacteria destruction mechanism based on the generation and roles of reactive species (RSs) is presented. Moreover, the effects of the chemical characteristics of the water matrix on photocatalytic bactericidal performance are discussed. Finally, the challenges regarding the development and application of 2D‐based photocatalysts for highly efficient water sterilization are highlighted. © 2018 Society of Chemical Industry

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Mechanism of photocatalytic disinfection using titania-graphene composites under UV and visible irradiation

Cited by 126 publications

References 29 publications

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites

Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

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Mechanism of photocatalytic disinfection using titania-graphene composites under UV and visible irradiation

Cited by 126 publications

References 29 publications

E. coli Bacteriostatic Action Using TiO2 Photocatalytic Reactions

E. coli Bacteriostatic Action Using TiO2 Photocatalytic Reactions

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO2 composites

Two‐dimensional nanomaterials for photocatalytic water disinfection: recent progress and future challenges

Contact Info

Product

Resources

About

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

E. coli Bacteriostatic Action Using TiO₂ Photocatalytic Reactions

Photocatalytic disinfection and purification of water employing reduced graphene oxide/TiO₂ composites