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Ismail AA, Al-Hajji L, Azad I, Al-Yaqoot A, Habibi N, Alseidi M, Ahmed S. Self-cleaning application of mesoporous ZnO, TiO2 and Fe2O3 films with the accommodation of silver nanoparticles for antibacterial activity. J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2022.104627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Trabelsi K, Abidi M, Hajjaji A, Tefdini R, Bessais B, Rtimi S. Photoelectrochemical properties and reactivity of supported titanium NTs for bacterial inactivation and organic pollutant removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:10733-10744. [PMID: 36083373 DOI: 10.1007/s11356-022-22923-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 09/03/2022] [Indexed: 06/15/2023]
Abstract
In this work, we report on the effect of anodization time on the morphology, optical, and photocatalytic properties of TiO2 nanotubes (NTs) allowing bacterial inactivation and two organic pollutant degradation under low-intensity solar-simulated light. Scanning electron microscopy (SEM) showed that the length of the TiO2 NTs increased from 2.8 to 25.8 μm as anodization time was increased from 15 to 300 min at 60 V, respectively. The X-ray diffraction (XRD) patterns showed that all samples crystallize in the anatase phase after annealing at 400 °C for 3 h. Samples anodized for 30 and 60 min exhibit low diffuse reflection at 400 nm, which was attributed to the disorder-induced exciton scattering at the molecular level. The intensity of the photoluminescence (PL) spectra was found to increase as the length of the NTs increases up to a maximum anodization time of 300 min, revealing the contribution of bulk excitonic states. A maximum photoelectric conversion efficiency of 0.55% was obtained at a potential of - 0.5 V vs. Ag/AgCl for TiO2 NTs anodized for 60 min. The optimized NTs (anodized for 60 min) showed a photocatalytic bacterial inactivation of a magnitude of 6 log within 360 min and a degradation of indole and methylene blue (MB) under low-intensity solar-simulated light (50 mW/cm2). The stability of the prepared catalyst was tested over several cycles.
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Affiliation(s)
- Khaled Trabelsi
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Mabrouk Abidi
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Anouar Hajjaji
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Rania Tefdini
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Brahim Bessais
- Laboratoire de Photovoltaïque, Centre de Recherches Et Des Technologies de L'Energie, Technopole de Borj-Cédria, BP 95, 2050, Hamm, Tunisia
| | - Sami Rtimi
- Laboratoire de Technologie des Poudres (LTP), Ecole Polytechnique Fédérale de Lausanne (EPFL), EPFL-STI-IMX-LTP, Station 12, CH-1015, Lausanne, Switzerland.
- Global Institute for Water, Environment and Health, 1210, Geneva, Switzerland.
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Abidi M, Abou Saoud W, Bouzaza A, Hajjaji A, Bessais B, Wolbert D, Assadi A, Rtimi S. Dynamics of VOCs degradation and bacterial inactivation at the interface of AgxO/Ag/TiO2 prepared by HiPIMS under indoor light. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Prakruthi K, Ujwal MP, Yashas SR, Mahesh B, Kumara Swamy N, Shivaraju HP. Recent advances in photocatalytic remediation of emerging organic pollutants using semiconducting metal oxides: an overview. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:4930-4957. [PMID: 34797548 DOI: 10.1007/s11356-021-17361-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/31/2021] [Indexed: 06/13/2023]
Abstract
Many untreated and partly treated wastewater from the home and commercial resources is being discharged into the aquatic environment these days, which contains numerous unknown and complex natural and inorganic compounds. These compounds tend to persist, initiating severe environmental problems, which affect human health. Conventionally, physicochemical treatment methods were adopted to remove such complex organic chemicals, but they suffer from critical limitations. Over time, photocatalysis, an advanced oxidation process, has gained its position for its efficient and fair performance against emerging organic pollutant decontamination. Typically, photocatalysis is a green technology to decompose organics under UV/visible light at ambient conditions. Semiconducting nanometal oxides have emerged as pioneering photocatalysts because of large active surface sites, flexible oxidation states, various morphologies, and easy preparation. The current review presents an overview of emerging organic pollutants and their effects, advanced oxidation processes, photocatalytic mechanism, types of photocatalysts, photocatalyst support materials, and methods for improving photodegradation efficiency on the degradation of complex emerging organic pollutants. In addition, the recent reports of metal-oxide-driven photocatalytic remediation of emerging organic pollutants are presented in brief. This review is anticipated to reach a broader scientific community to understand the first principles of photocatalysis and review the recent advancements in this field.
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Affiliation(s)
- Komargoud Prakruthi
- Department of Environmental Engineering, JSS Science and Technology University, Mysuru , 570006, India
| | | | - Shivamurthy Ravindra Yashas
- Department of Environmental Science, Faculty of Natural Science, JSS Academy of Higher Education and Research, Mysuru, 570015, India
| | - Basavaraju Mahesh
- Department of Chemistry, JSS Academy of Technical Education, Dr. Vishnuvardhan Road, Bengaluru, 560060, India
| | - Ningappa Kumara Swamy
- Department of Chemistry, JSS Science and Technology University, Mysuru, 570006, India.
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Chakhtouna H, Benzeid H, Zari N, Qaiss AEK, Bouhfid R. Recent progress on Ag/TiO 2 photocatalysts: photocatalytic and bactericidal behaviors. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:44638-44666. [PMID: 34212334 PMCID: PMC8249049 DOI: 10.1007/s11356-021-14996-y] [Citation(s) in RCA: 81] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 06/15/2021] [Indexed: 05/23/2023]
Abstract
For many decades, titanium dioxide (TiO2) semiconductor has been extensively applied in several environmental applications due to its higher photocatalytic performances toward different organic pollutants, pharmaceutical compounds, and bacteria. However, its shortfall response to visible light, and the expeditious recombination rate of the photogenerated electron-hole pairs, hampers its utilization. Doping TiO2 semiconductor with silver nanoparticles is a sound strategy to (1) extend its photocatalytic activity to visible light, (2) prevent the electron/holes pairs recombination due to the formation of the Schottky barrier at the interfaces with TiO2 that act as an electron-trapping center, and (3) enhance its bactericide performances. This review focuses on the recent progress on silver-doped titanium dioxide (Ag/TiO2)-based photocatalysts. It addresses a wide range of Ag/TiO2 synthesis techniques, their physicochemical properties and discusses thoroughly the important role of silver (Ag) nanoparticles in enhancing the removal capacity and antibacterial performances of the Ag/TiO2 photocatalysts.
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Affiliation(s)
- Hanane Chakhtouna
- Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Composites and Nanocomposites Center, Rabat Design Center, Rue Mohamed El Jazouli, Madinat El Irfane, 10100, Rabat, Morocco
- Laboratory of Analytical Chemistry and Bromatology, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Hanane Benzeid
- Laboratory of Analytical Chemistry and Bromatology, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco
| | - Nadia Zari
- Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Composites and Nanocomposites Center, Rabat Design Center, Rue Mohamed El Jazouli, Madinat El Irfane, 10100, Rabat, Morocco
| | - Abou El Kacem Qaiss
- Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Composites and Nanocomposites Center, Rabat Design Center, Rue Mohamed El Jazouli, Madinat El Irfane, 10100, Rabat, Morocco
| | - Rachid Bouhfid
- Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Composites and Nanocomposites Center, Rabat Design Center, Rue Mohamed El Jazouli, Madinat El Irfane, 10100, Rabat, Morocco.
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Update on Interfacial Charge Transfer (IFTC) Processes on Films Inactivating Viruses/Bacteria under Visible Light: Mechanistic Considerations and Critical Issues. Catalysts 2021. [DOI: 10.3390/catal11020201] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
This review presents an update describing binary and ternary semiconductors involving interfacial charge transfer (IFCT) in composites made up by TiO2, CuO, Ag2O and Fe2O3 used in microbial disinfection (bacteria and viruses). The disinfection mechanism, kinetics and generation of reactive oxygen species (ROS) in solution under solar/visible light are discussed. The surface properties of the photocatalysts and their active catalytic sites are described in detail. Pathogenic biofilm inactivation by photocatalytic thin films is addressed since biofilms are the most dangerous agents of spreading pathogens into the environment.
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Bouabibsa I, Alhussein A, Lamri S, Sanchette F, Rtimi S. Biological responses at the interface of Ti-doped diamond-like carbon surfaces for indoor environment application. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:31120-31129. [PMID: 32474782 DOI: 10.1007/s11356-020-09376-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Accepted: 05/19/2020] [Indexed: 06/11/2023]
Abstract
Diamond-like carbon (DLC) and titanium-doped DLC coatings were prepared by hybrid PECVD/direct current magnetron sputtering (DCMS). In this study, we show that the operating conditions of titanium-doped DLC coatings used for implants in surgical devices significantly modify their surface properties and consequently their interaction with cells. The coatings showed uniform distribution on the substrate and their biocompatibility was tested by way of rat calvaria osteoblasts. Doping DLC with Ti changed the roughness and wettability of the film interface. The autoclaving of the samples led to the surface oxidation and the formation of TiO2 on the top-most layers of Ti-doped DLC. This was quantitatively assessed by X-ray photoelectron spectroscopy (XPS) and revealed the presence of Ti3+ and Ti4+ species in redox reactions during their interactions with cells. By XPS analysis, the oxidative carbonaceous species C=O and O=C-C were detected during the bacterial inactivation. Reactive oxygen species (ROS) were identified on the sputtered samples and the ⦁OH radical was identified as the most important oxidative radical intermediate leading to bacterial disinfection. The position of the intra-gap of the oxidized C species is suggested within the TiO2 bandgap.
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Affiliation(s)
- Imane Bouabibsa
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Akram Alhussein
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France.
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France.
| | - Salim Lamri
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Frederic Sanchette
- ICD-LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
- Nogent International Center for CVD Innovation, LRC CEA-ICD LASMIS, Antenne de Nogent, Pôle Technologique Sud Champagne, Université de Technologie de Troyes, 52800, Nogent, France
| | - Sami Rtimi
- EPFL-SB-SB-GPAO, Ecole Polytechnique Fédérale de Lausanne, Station 6, 1015, Lausanne, Switzerland
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Architectured Cu–TNTZ Bilayered Coatings Showing Bacterial Inactivation under Indoor Light and Controllable Copper Release: Effect of the Microstructure on Copper Diffusion. COATINGS 2020. [DOI: 10.3390/coatings10060574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A Ti–23Nb–0.7Ta–2Zr–1.2O alloy (at %), called “gum metal”, was deposited by direct-current magnetron sputtering (DCMS) on an under layer of copper. By varying the working pressure during the deposition, columnar TNTZ (Ti–Nb–Ta–Zr) nanoarchitectures were obtained. At low working pressures, the upper layer was dense with a coarse surface (Ra = 12 nm) with a maximum height of 163 nm; however, the other samples prepared at high working pressures showed columnar architectures with voids and an average roughness of 4 nm. The prepared coatings were characterized using atomic force microscopy (AFM) for surface topography, energy dispersive X-ray spectroscopy (EDX) for atomic mapping, scanning electron microscopy (SEM) for cross-section imaging, contact angle measurements for hydrophilic/hydrophobic balance of the prepared surfaces, and X-ray diffraction (XRD) for the crystallographic structures of the prepared coatings. The morphology and the density of the prepared coatings were seen to influence the hydrophilic properties of the surface. The antibacterial activity of the prepared coatings was tested in the dark and under low-intensity indoor light. Bacterial inactivation was seen to happen in the dark from samples presenting columnar nanoarchitectures. This was attributed to the diffusion of copper ions from the under layer. To verify the copper release from the prepared samples, an inductively coupled plasma mass spectrometer (ICP-MS) was used. Additionally, the atomic depth profiling of the elements was carried out by X-ray photoelectron spectroscopy (XPS) for the as-prepared samples and for the samples used for bacterial inactivation. The low amount of copper in the bulk of the TNTZ upper layer justifies its diffusion to the surface. Recycling of the antibacterial activity was also investigated and revealed a stable activity over cycles.
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Rtimi S, Konstantinidis S, Britun N, Nadtochenko V, Khmel I, Kiwi J. New Evidence for Ag-Sputtered Materials Inactivating Bacteria by Surface Contact without the Release of Ag Ions: End of a Long Controversy? ACS APPLIED MATERIALS & INTERFACES 2020; 12:4998-5007. [PMID: 31895531 DOI: 10.1021/acsami.9b15859] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The study provides new evidence for Ag-coated polyester (PES) mediating Escherichia coli inactivation by way of genetically engineered E. coli (without porins, from now denoted porinless bacteria). This allows the quantification of the bactericidal kinetics induced by the Ag surface without the intervention of Ag ions. Bacterial inactivation mediated by Ag-PES was seen to be completed within 60 min. The samples were prepared by high-power impulse magnetron sputtering (HiPIMS) at different sputter powers. In anaerobic media, this process required 120 min. The amounts of ions (Ar+, Ag+, and Ag2+) generated during the deposition by direct current magnetron sputtering (DCMS) and HiPIMS were determined by mass spectrometry. The thickness of the Ag films sputtered on PES by DCMS (0.28 A) during 100 s was found to be 340 nm. Thicknesses of 250, 230, and 200 nm were found when sputtering with HiPIMS was tuned at 8, 17, and 30 A, respectively. By scanning transmission electron microscopy (STEM-HAADF), the atomic distribution of Ag and oxygen was detected. By X-ray photoelectron spectroscopy (XPS), a shift in the Ag oxidation state was observed within the bacterial inactivation period. This reveals redox catalysis within the time required for the total bacterial inactivation due to the interaction between the bacterial suspension and Ag-PES. Surface properties of the Ag-coated PES samples were additionally investigated by X-ray diffraction (XRD). The formation of Ag plasmon was detected by diffuse reflectance spectroscopy (DRS) and was a function of the applied sputtering energy. The indoor sunlight irradiation dose required to induce an accelerated bacterial inactivation was found to be 5-10 mW/cm2.
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Affiliation(s)
- Sami Rtimi
- Ecole Polytechnique Fédérale de Lausanne, EPFL-STI-LTP , Station 12 , CH-1015 Lausanne , Switzerland
| | - Stephanos Konstantinidis
- Chimie des Interactions Plasma-Surface , Université de Mons , Place du Parc 23 , 7000 Mons , Belgium
| | - Nikolay Britun
- Chimie des Interactions Plasma-Surface , Université de Mons , Place du Parc 23 , 7000 Mons , Belgium
| | - Victor Nadtochenko
- N. Semenov Federal Research Center Chemical Physics , Russian Academy of Sciences , Kosygin Street 4 , Moscow 119991 , Russia
| | - Inessa Khmel
- Institute of Molecular Genetics , Russian Academy of Sciences , Kurchatov sq.2 , Moscow 123182 , Russia
| | - John Kiwi
- Ecole Polytechnique Fédérale de Lausanne EPFL-GPAO , Bat GC, Station 6 , CH-1015 Lausanne , Switzerland
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Graf A, Finkel J, Chauvet AAP, Rtimi S. Deciphering the Mechanisms of Bacterial Inactivation on HiPIMS Sputtered Cu xO-FeO x-PET Surfaces: From Light Absorption to Catalytic Bacterial Death. ACS APPLIED MATERIALS & INTERFACES 2019; 11:45319-45329. [PMID: 31696713 DOI: 10.1021/acsami.9b17380] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The production of nontoxic, affordable, and efficient antibacterial surfaces is key to the well-being of our societies. In this aim, antibacterial thin films have been prepared using earth-abundant metals deposited using high-power impulse magnetron sputtering (HiPIMS). The sputtered FeOx, CuxO, and mixed CuxO-FeOx films exhibited fast bacterial inactivation properties under exposure to indoor light (340-720 nm) showing total bacterial inactivation within 180, 120, and 60 min, respectively. The photocatalytic mechanisms of these films were investigated, from the absorption of photons up to the bacteria's fate, by means of ultrafast transient spectroscopy, flow cytometry, and malondialdehyde (MDA) quantification justifying the cell wall disruption. The primary driving force leading to bacterial inactivation was found to be the oxidative stress at the interface between the sputtered thin films and the microorganism. This was justified by using engineered porinless bacteria disabling the possible ion diffusion leading to internal bacterial inactivation. Such stress is a direct consequence of the photogenerated electron-hole pairs at the interface of the sputtered layers. By diffuse reflectance spectroscopy, we found that both FeOx and CuxO present a band gap of ∼2.9 eV (>425 nm), while the mixed CuxO-FeOx thin film has a band gap below 2.3 eV (>540 nm). The structure and atomic composition of the films were characterized by energy-dispersive X-ray, X-ray photoelectron, and optical spectroscopy. While the composition and metal oxidation states are distinct in all three films, the difference in photocatalytic efficiency can, at first sight, be explained as the direct consequence of their absorbance and the unique interaction between Fe and Cu oxides in the composite film.
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Affiliation(s)
- Arthur Graf
- Department of Chemistry , The University of Sheffield , Dainton Building, C94, S10 2TN Sheffield , U.K
| | - Jake Finkel
- Department of Chemistry , The University of Sheffield , Dainton Building, C94, S10 2TN Sheffield , U.K
| | - Adrien A P Chauvet
- Department of Chemistry , The University of Sheffield , Dainton Building, C94, S10 2TN Sheffield , U.K
| | - Sami Rtimi
- EPFL-STI-IMX-LTP, Station 12 , Ecole Polytechnique Fédérale de Lausanne , 1015 Lausanne , Switzerland
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Tsendzughul NT, Ogwu AA. Physicochemical Aspects of the Mechanisms of Rapid Antimicrobial Contact-Killing by Sputtered Silver Oxide Thin Films under Visible Light. ACS OMEGA 2019; 4:16847-16859. [PMID: 31646231 PMCID: PMC6796911 DOI: 10.1021/acsomega.9b01856] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 09/12/2019] [Indexed: 06/10/2023]
Abstract
The morphology and band gap of silver oxide thin films have been tuned by radio frequency reactive magnetron sputtering to deposit transparent, visible-light-activated photocatalytic biomaterials with excellent antimicrobial properties. X-ray diffraction, Raman spectroscopy, and X-ray photoelectron spectroscopy using the Ag 3d5/2 and Ag 3d3/2 binding energy peaks have been used to study the chemical composition of the films, and the deposition of two antimicrobial phases of silver oxide, namely, Ag2O and Ag4O4 was confirmed. The optical band gaps of the films were determined by optical spectroscopy and are in the range 2.3 eV (539.6 nm) to 3.2 eV (387.8 nm). Strong transmission of up to 80% was observed in the visible region around 650-750 nm. Silver ion release on the surfaces of the films was monitored using atomic absorption spectroscopy, and sustained silver ion release in both water and saline solution for 24 h was confirmed. Nanocrystallites of sizes between 2.45 and 31.30 nm were observed on the surfaces. The films were challenged with two Gram-positive bacteria (Staphylococcus aureus and Staphylococcus epidermidis) and two Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa) during antimicrobial activity tests using killing curve analysis with 100% contact killing recorded in 25 and 5 min, respectively. The mechanism of antimicrobial efficacy is suggested to be due to silver ion release, small crystallites, and the ease of ligand replacement in the silver oxide stoichiometry, their exchange and interactions of ligands in the microbe's biological systems. Our current finding opens the door to furthering the development of visible-light-activated antimicrobial surfaces.
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Affiliation(s)
- Nathaniel T. Tsendzughul
- School
of Computing, Engineering and Physical Sciences, University of the West of Scotland, High Street, Paisley Campus, PA1 2BE Scotland, U.K.
| | - Abraham A. Ogwu
- East
Kazakhstan State Technical University, Ust-Kamenogorsk 070004, Republic of Kazakhstan
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Achouri F, BenSaid M, Bousselmi L, Corbel S, Schneider R, Ghrabi A. Comparative study of Gram-negative bacteria response to solar photocatalytic inactivation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:18961-18970. [PMID: 29862482 DOI: 10.1007/s11356-018-2435-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 05/28/2018] [Indexed: 06/08/2023]
Abstract
Solar photocatalytic inactivation of Gram-negative bacteria with immobilized TiO2-P25 in a fixed-bed reactor was modeled with simplified kinetic equations. The kinetic parameters are the following: the photocatalytic inactivation coefficient (kd,QUV), the initial bacterial reduction rate (A) in the contact with the disinfecting agent, and the threshold level of damage (n) were determined to report the effect of QUV/TiO2-P25 on bacterial cultivability and viability and to compare the response of bacterial strains to photocatalytic treatment. In addition, the integration of the reactivation coefficient (Cr) in the photocatalytic inactivation equation allowed evaluating the ability of bacterial reactivation after photocatalytic stress. Results showed different responses of the bacteria strains to photocatalytic stress and the ability of certain bacterial strains such as Escherichia coli ATCC25922 and Pseudomonas aeruginosa ATCC4114 to resuscitate after photocatalytic treatment.
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Affiliation(s)
- Faouzi Achouri
- Centre de Recherches et des Technologies des Eaux (CERTE), Laboratoire Eaux Usees et environnement, P.O. Box 273, 8020, Soliman, Tunis, Tunisia.
- Université de Lorraine, Laboratoire Reactions et Genie des Procedes (LRGP), UMR7274, CNRS, 18 rue Grandville, BP20451, 54001, Nancy Cedex, France.
- Faculté des Sciences de Bizerte, Université de Carthage, Jarzouna, 7021, Bizerte, Tunisia.
| | - Myriam BenSaid
- Centre de Recherches et des Technologies des Eaux (CERTE), Laboratoire Eaux Usees et environnement, P.O. Box 273, 8020, Soliman, Tunis, Tunisia
| | - Latifa Bousselmi
- Centre de Recherches et des Technologies des Eaux (CERTE), Laboratoire Eaux Usees et environnement, P.O. Box 273, 8020, Soliman, Tunis, Tunisia
| | - Serge Corbel
- Université de Lorraine, Laboratoire Reactions et Genie des Procedes (LRGP), UMR7274, CNRS, 18 rue Grandville, BP20451, 54001, Nancy Cedex, France
| | - Raphaël Schneider
- Université de Lorraine, Laboratoire Reactions et Genie des Procedes (LRGP), UMR7274, CNRS, 18 rue Grandville, BP20451, 54001, Nancy Cedex, France
| | - Ahmed Ghrabi
- Centre de Recherches et des Technologies des Eaux (CERTE), Laboratoire Eaux Usees et environnement, P.O. Box 273, 8020, Soliman, Tunis, Tunisia
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Photocatalytic Performance of Cu xO/TiO₂ Deposited by HiPIMS on Polyester under Visible Light LEDs: Oxidants, Ions Effect, and Reactive Oxygen Species Investigation. MATERIALS 2019; 12:ma12030412. [PMID: 30699939 PMCID: PMC6385099 DOI: 10.3390/ma12030412] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 01/18/2019] [Accepted: 01/22/2019] [Indexed: 01/21/2023]
Abstract
In the present study, we propose a new photocatalytic interface prepared by high-power impulse magnetron sputtering (HiPIMS), and investigated for the degradation of Reactive Green 12 (RG12) as target contaminant under visible light light-emitting diodes (LEDs) illumination. The CuxO/TiO₂ nanoparticulate photocatalyst was sequentially sputtered on polyester (PES). The photocatalyst formulation was optimized by investigating the effect of different parameters such as the sputtering time of CuxO, the applied current, and the deposition mode (direct current magnetron sputtering, DCMS or HiPIMS). The results showed that the fastest RG12 degradation was obtained on CuxO/TiO₂ sample prepared at 40 A in HiPIMS mode. The better discoloration efficiency of 53.4% within 360 min was found in 4 mg/L of RG12 initial concentration and 0.05% Cuwt/PESwt as determined by X-ray fluorescence. All the prepared samples contained a TiO₂ under-layer with 0.02% Tiwt/PESwt. By transmission electron microscopy (TEM), both layers were seen uniformly distributed on the PES fibers. The effect of the surface area to volume (dye volume) ratio (SA/V) on the photocatalytic efficiency was also investigated for the discoloration of 4 mg/L RG12. The effect of the presence of different chemicals (scavengers, oxidant or mineral pollution or salts) in the photocatalytic medium was studied. The optimization of the amount of added hydrogen peroxide (H₂O₂) and potassium persulfate (K₂S₂O₈) was also investigated in detail. Both, H₂O₂ and K₂S₂O₈ drastically affected the discoloration efficiency up to 7 and 6 times in reaction rate constants, respectively. Nevertheless, the presence of Cu (metallic nanoparticles) and NaCl salt inhibited the reaction rate of RG12 discoloration by about 4 and 2 times, respectively. Moreover, the systematic study of reactive oxygen species' (ROS) contribution was also explored with the help of iso-propanol, methanol, and potassium dichromate as •OH radicals, holes (h⁺), and superoxide ion-scavengers, respectively. Scavenging results showed that O₂- played a primary role in RG12 removal; however, •OH radicals' and photo-generated holes' (h⁺) contributions were minimal. The CuxO/TiO₂ photocatalyst was found to have a good reusability and stability up to 21 cycles. Ions' release was quantified by means of inductively coupled plasma mass spectrometry (ICP-MS) showing low Cu-ions' release.
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Jang YJ, Jung YE, Kim GW, Lee CY, Park YD. Metal–organic frameworks in a blended polythiophene hybrid film with surface-mediated vertical phase separation for the fabrication of a humidity sensor. RSC Adv 2019; 9:529-535. [PMID: 35521569 PMCID: PMC9059327 DOI: 10.1039/c8ra09201j] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2018] [Accepted: 12/19/2018] [Indexed: 11/21/2022] Open
Abstract
HKUST-1 blended P3HT film dramatically improved the electrical signal variations in an OTFT-based humidity sensor due to the superior gas capture properties and the porosity of the HKUST-1.
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Affiliation(s)
- Young Jin Jang
- Department of Energy and Chemical Engineering
- Incheon National University
- Incheon 22012
- Republic of Korea
| | - Yoo Eil Jung
- Department of Energy and Chemical Engineering
- Incheon National University
- Incheon 22012
- Republic of Korea
| | - Gun Woo Kim
- Department of Energy and Chemical Engineering
- Incheon National University
- Incheon 22012
- Republic of Korea
| | - Chang Yeon Lee
- Department of Energy and Chemical Engineering
- Incheon National University
- Incheon 22012
- Republic of Korea
| | - Yeong Don Park
- Department of Energy and Chemical Engineering
- Incheon National University
- Incheon 22012
- Republic of Korea
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Mechanisms of the Antibacterial Effects of TiO2–FeOx under Solar or Visible Light: Schottky Barriers versus Surface Plasmon Resonance. COATINGS 2018. [DOI: 10.3390/coatings8110391] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This study reports the significant mechanistic difference between binary-oxide antibacterial films with the same composition but different microstructures. Binary TiO2-FeOx films were found to present a faster bacterial inactivation kinetics under visible light irradiation than each single oxide acting independently. The interaction between the film active surface species and the bacteria within the disinfection period was followed by X-ray photoelectron spectroscopy (XPS) and provided the evidence for a redox catalysis taking place during the bacterial inactivation time. The optical and surface properties of the films were evaluated by appropriate surface analytical methods. A differential mechanism is suggested for each specific microstructure inducing bacterial inactivation. The surface FeOx plasmon resonance transferred electrons into the conduction band of TiO2 because of the Schottky barrier after Fermi level equilibration of the two components. An electric field at the interface between TiO2 and FeOx, favors the separation of the photo-generated charges leading to a faster bacterial inactivation by TiO2–FeOx compared to the bacterial inactivation kinetics by each of the single oxides.
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Milošević I, Rtimi S, Jayaprakash A, van Driel B, Greenwood B, Aimable A, Senna M, Bowen P. Synthesis and characterization of fluorinated anatase nanoparticles and subsequent N-doping for efficient visible light activated photocatalysis. Colloids Surf B Biointerfaces 2018; 171:445-450. [DOI: 10.1016/j.colsurfb.2018.07.035] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Revised: 06/22/2018] [Accepted: 07/16/2018] [Indexed: 10/28/2022]
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17
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Hajjaji A, Elabidi M, Trabelsi K, Assadi A, Bessais B, Rtimi S. Bacterial adhesion and inactivation on Ag decorated TiO2-nanotubes under visible light: Effect of the nanotubes geometry on the photocatalytic activity. Colloids Surf B Biointerfaces 2018; 170:92-98. [DOI: 10.1016/j.colsurfb.2018.06.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 06/02/2018] [Accepted: 06/04/2018] [Indexed: 10/14/2022]
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18
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Rtimi S, Kiwi J, Karimi A, Sanjinés R. Innovative Ti 1- xNb xN-Ag Films Inducing Bacterial Disinfection by Visible Light/Thermal Treatment. ACS APPLIED MATERIALS & INTERFACES 2018; 10:12021-12030. [PMID: 29601181 DOI: 10.1021/acsami.7b19225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study presents innovative Ti1- xNb xN-Ag films obtained by a suitable combination of low-energy and high-energy sputtering leading to bacterial inactivation. The bacterial inactivation kinetics by the TiNbN layers was drastically enhanced by the addition of 6-7% Ag and proceeded to completion within 3 h after the film autoclaving. By X-ray photoelectron spectroscopy (XPS), the samples after autoclaving presented in their upper layers TiO2, Nb2O5 and Ag2O with a surface composition of Ti0.81Nb0.19N0.99Ag0.068. Surface potential/pH changes in the Ti1- xNb xN-Ag films were monitored during bacterial inactivation. Surface redox processes during the bacterial inactivation were detected by XPS. The diffusion of Ag in the Ti1- xNb xN-Ag films was followed at 50 and 70 °C pointing. The beneficial thermal treatment points out to the bifunctional bacterial inactivation properties of these films and their potential application in healthcare facilities. Interfacial charge transfer (IFCT) under light irradiation between Ag2O, Nb2O5 and TiO2 is suggested consistent with the data found during the course of this study. The TiO2/Nb2O5 lattice mechanism is discussed in the framework of the Verwey's controlled valence model. The surface properties of the Ti1- xNb xN-Ag films were investigated by X-ray diffraction, atomic force microscopy, and scanning electron microscopy.
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Affiliation(s)
- Sami Rtimi
- EPFL-SB-ISIC-GPAO , Ecole Polytechnique Fédérale de Lausanne , Station 6, CH-1015 Lausanne , Switzerland
- EPFL-STI-IMX-LTP , Ecole Polytechnique Fédérale de Lausanne , Station 12, CH-1015 Lausanne , Switzerland
| | - John Kiwi
- EPFL-SB-ISIC-GPAO , Ecole Polytechnique Fédérale de Lausanne , Station 6, CH-1015 Lausanne , Switzerland
| | - Ayat Karimi
- EPFL-SB-IPHY-LPMC , Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne , Switzerland
| | - Rosendo Sanjinés
- EPFL-SB-IPHY-LPMC , Ecole Polytechnique Fédérale de Lausanne , Station 3, CH-1015 Lausanne , Switzerland
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Photocatalytic performance of TiO 2 impregnated polyester for the degradation of Reactive Green 12: Implications of the surface pretreatment and the microstructure. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.07.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Rtimi S, Giannakis S, Pulgarin C. Self-Sterilizing Sputtered Films for Applications in Hospital Facilities. Molecules 2017; 22:E1074. [PMID: 28657579 PMCID: PMC6152303 DOI: 10.3390/molecules22071074] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 05/23/2017] [Indexed: 12/02/2022] Open
Abstract
This review addresses the preparation of antibacterial 2D textile and thin polymer films and 3D surfaces like catheters for applications in hospital and health care facilities. The sputtering of films applying different levels of energy led to the deposition of metal/oxide/composite/films showing differentiated antibacterial kinetics and surface microstructure. The optimization of the film composition in regards to the antibacterial active component was carried out in each case to attain the fastest antibacterial kinetics, since this is essential when designing films avoiding biofilm formation (under light and in the dark). The antimicrobial performance of these sputtered films on Staphylococcus aureus (MRSA) and Escherichia coli (E. coli) were tested. A protecting effect of TiO₂ was found for the release of Cu by the TiO₂-Cu films compared to films sputtered by Cu only. The Cu-released during bacterial inactivation by TiO₂-Cu was observed to be much lower compared to the films sputtered only by Cu. The FeOx-TiO₂-PE films induced E. coli inactivation under solar or under visible light with a similar inactivation kinetics, confirming the predominant role of FeOx in these composite films. By up-to-date surface science techniques were used to characterize the surface properties of the sputtered films. A mechanism of bacteria inactivation is suggested for each particular film consistent with the experimental results found and compared with the literature.
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Affiliation(s)
- Sami Rtimi
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Stefanos Giannakis
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
| | - Cesar Pulgarin
- Group of Advanced Oxidation Processes, Swiss Federal Institute of Technology, EPFL-SB-ISIC-GPAO, Station 6, CH-1015 Lausanne, Switzerland.
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