Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

Pasquale, Ilaria De; Porto, Chiara Lo; Dell’Edera, Massimo; Petronella, Francesca; Agostiano, Angela; Curri, Maria Lucia; Comparelli, Roberto

doi:10.3390/catal10121382

Cited by 52 publications

(31 citation statements)

References 179 publications

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“…The role of oxidative stress in titanium dioxide-induced antimicrobial activity was confirmed by several previously published reports [24,25,41,53,54]. The promote photo-oxidation and photo-reduction processes, which can lead to ROS generation, were also observed for TOCs systems [14,18,55]. The formation of such radicals as oxide (O − ), superoxide (O 2 − ) or hydroxyl (•OH), and non-radicals, e.g., hydrogen peroxide (H 2 O 2 ) or hydroxyl (OH − ) ions, has been confirmed [14,56].…”

Section: Discussionsupporting

confidence: 65%

The Composites of PCL and Tetranuclear Titanium(IV)-oxo Complexes as Materials Exhibiting the Photocatalytic and the Antimicrobial Activity

Kubiak

Radtke

Topolski

et al. 2021

IJMS

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Excessive misuse of antibiotics and antimicrobials has led to a spread of microorganisms resistant to most currently used agents. The resulting global threats has driven the search for new materials with optimal antimicrobial activity and their application in various areas of our lives. In our research, we focused on the formation of composite materials produced by the dispersion of titanium(IV)-oxo complexes (TOCs) in poly(ε-caprolactone) (PCL) matrix, which exhibit optimal antimicrobial activity. TOCs, of the general formula [Ti4O2(OiBu)10(O2CR')2] (R' = PhNH2 (1), C13H9 (2)) were synthesized as a result of the direct reaction of titanium(IV) isobutoxide and 4-aminobenzoic acid or 9-fluorenecarboxylic acid. The microcrystalline powders of (1) and (2), whose structures were confirmed by infrared (IR) and Raman spectroscopy, were dispersed in PCL matrixes. In this way, the composites PCL + nTOCs (n = 5 and 20 wt.%) were produced. The structure and physicochemical properties were determined on the basis of Raman microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), electron paramagnetic resonance spectroscopy (EPR), and UV–Vis diffuse reflectance spectroscopy (DRS). The degree of TOCs distribution in the polymer matrix was monitored by scanning electron microscopy (SEM). The addition of TOCs micro grains into the PCL matrix only slightly changed the thermal and mechanical properties of the composite compared to the pure PCL. Among the investigated PCL + TOCs systems, promising antibacterial properties were confirmed for samples of PCL + n(2) (n = 5, 20 wt.%) composites, which simultaneously revealed the best photocatalytic activity in the visible range.

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Section: Discussionsupporting

confidence: 65%

The Composites of PCL and Tetranuclear Titanium(IV)-oxo Complexes as Materials Exhibiting the Photocatalytic and the Antimicrobial Activity

Kubiak

Radtke

Topolski

et al. 2021

IJMS

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“…For example, Ag nanoparticles have the ability to kill a great variety of Gram-positive and Gram-negative bacteria [ 9 ]; also, titanium dioxide (TiO 2 ) particles have been widely investigated due to their antimicrobial property caused by photocatalysis. When this latter occurred, under light, it generates enough energy for the production of reactive oxygen species (ROS), which possess great potential in damaging microbial cells [ 10 , 11 ]. Another inorganic filler used as an alternative antimicrobial agent is the barium titanate (BT).…”

Section: Introductionmentioning

confidence: 99%

Bacteriostatic Behavior of PLA-BaTiO3 Composite Fibers Synthesized by Centrifugal Spinning and Subjected to Aging Test

Boschetto

Doan

et al. 2021

Molecules

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The present work investigated the effect of Polylactic acid (PLA) fibers produced by centrifugal spinning with incorporated BaTiO3 particles to improve their bacteriostatic behavior. The PLA matrix and three composites, presenting three different amounts of fillers, were subjected to UV/O3 treatment monitoring the possible modifications that occurred over time. The morphological and physical properties of the surfaces were characterized by different microscopic techniques, contact angle, and surface potential measurements. Subsequently, the samples were tested in vitro with human dermal fibroblasts (HDF) to verify the cytotoxicity of the substrates. No significant differences between the PLA matrix and composites emerged; the high hydrophobicity of the fibers, derived by the polymer structure, represented an obstacle limiting the fibroblast attachment. Samples underwent bacterial exposure (Staphylococcus epidermidis) for 12 and 24 h. Increasing the concentration of BT, the number of living bacteria and their distribution decreased in comparison with the PLA matrix suggesting an effect of the inorganic filler, which generates a neutralization effect leading to reactive oxygen species (ROS) generation and subsequently to bacterial damages. These results suggest that the barium titanate (BT) fillers clearly improve the antibacterial properties of PLA fibers after aging tests made before bacterial exposure, representing a potential candidate in the creation of composites for medical applications.

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“…A large number of nanomaterials and composites have been reported to provide decontamination functions [ 15 ]. Among them, nano-TiO 2 has attracted special attention based on its high surface-to-volume ratio and excellent photocatalytic behavior [ 16 ]. Upon illumination, nano-TiO 2 absorbs high-energy photons to excite electrons to the conduction band, which induces generation of reactive oxygen species (ROS), such as HO•, O 2 − •, etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a composite coating film via vapor induced phase separation for air purification and real-time bacteria photocatalytic inactivation

Zhong

Xiong

2021

Progress in Organic Coatings

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Infectious diseases resulted from transmitting of bacteria or virus like COVID-19 via air-borne droplets have brought severe threat to human beings worldwide. Cutting the spreading paths to obtain clean air is one of the promising strategies to prevent people from such dangerous diseases. In this work, we have employed a strategy of spray coating in combination with vapor induced phase separation to prepare a composite coating film to fulfill that purpose. A stable mixture suspension containing micelles of block copolymer of poly(styrene- block -butadiene- block -styrene) and TiO 2 nanoparticles was sprayed onto stainless steel mesh to evaporate solvent in non-solvent vapor atmospheres. A water vapor atmosphere and an ethanol vapor atmosphere were in turn employed to improve the mechanical strength of the obtained coating film. The porous microstructure, the porosity, and the superhydrophobicity of the coating film were carefully characterized and analyzed. The air pressure-drop of the coating film was determined to be lower than 100 Pa, indicating a high air permeability. Moreover, a foggy air containing E. coli was pressed through the coating film via a home-made apparatus to simulate the air purification system, where E. coli contained air-borne droplets were intercepted by the film matrix in a physical manner, and the bacteria was photocatalytically inactivated at the meantime. A filtration efficiency of 99.7% and a 99.6% efficiency of real-time photocatalytic inactivation of E. coli demonstrate the promising potential of the coating film.

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Photocatalytic TiO2-Based Nanostructured Materials for Microbial Inactivation

Cited by 52 publications

References 179 publications

The Composites of PCL and Tetranuclear Titanium(IV)-oxo Complexes as Materials Exhibiting the Photocatalytic and the Antimicrobial Activity

The Composites of PCL and Tetranuclear Titanium(IV)-oxo Complexes as Materials Exhibiting the Photocatalytic and the Antimicrobial Activity

Bacteriostatic Behavior of PLA-BaTiO3 Composite Fibers Synthesized by Centrifugal Spinning and Subjected to Aging Test

Preparation of a composite coating film via vapor induced phase separation for air purification and real-time bacteria photocatalytic inactivation

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