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Chauhan A, Agnihotri S, Vasundhara M. Enhanced solar light-driven photocatalysis of norfloxacin using Fe-doped TiO 2: RSM optimization, DFT simulations, and toxicity study. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:47991-48013. [PMID: 39017867 DOI: 10.1007/s11356-024-34080-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2024] [Accepted: 06/18/2024] [Indexed: 07/18/2024]
Abstract
This study investigates the photocatalytic degradation of norfloxacin (NFX) utilizing Fe-doped TiO2 nanocomposite under natural sunlight. TiO2-based photocatalysts were synthesized using chemical precipitation varying Fe-dopant concentration and characterized in detail. Theoretical modelling, centred on density functional theory (DFT), elucidated that Fe ions within the TiO2 lattice are effectively confined, thereby narrowing the wide band gap of TiO2. The findings strongly support that Fe3+ ions augmented the photocatalytic activity of TiO2 by facilitating an intermediate interfacial route for electron and hole transfer, particularly up to an optimal dopant concentration of 1.5 M%. Subsequently, a three-level Box-Behnken design (BBD) was developed to determine the initial pH, optimal catalyst concentration, and drug dosage. High-performance liquid chromatography-mass spectrometry (HPLC-MS) was employed to identify reaction intermediates, thereby establishing a potential degradation pathway. Notably, sustained recyclability was achieved, with 82% degradation efficiency maintained over five cycles. Additionally, the toxicity of degradation intermediates was evaluated through bacterial and phytotoxicity tests, affirming the environmental safety of treated water. In vitro toxicity of the nanomaterial was also examined, emphasizing its environmental implications. Scavenger experiments revealed that hole and hydroxyl radicals were the primary active species in Fe-TiO2-based photocatalysis. Furthermore, the antibacterial potential of the synthesized catalyst was assessed using Escherichia coli and Staphylococcus aureus to observe their respective antibacterial responses.
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Affiliation(s)
- Anjali Chauhan
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala, 147004, Punjab, India
| | - Shekhar Agnihotri
- Department of Agriculture and Environmental Sciences, National Institute of Food Technology Entrepreneurship and Management, Kundli, Sonepat, Haryana, 131028, India.
- Centre for Advanced Translational Research in Food Nano-Biotechnology (CATR-FNB), National Institute of Food Technology Entrepreneurship and Management, Kundli, Sonepat, Haryana, 131028, India.
| | - Mondem Vasundhara
- Department of Biotechnology, Thapar Institute of Engineering and Technology, Bhadson Road, Patiala, 147004, Punjab, India
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Basavegowda N, Baek KH. Combination Strategies of Different Antimicrobials: An Efficient and Alternative Tool for Pathogen Inactivation. Biomedicines 2022; 10:2219. [PMID: 36140320 PMCID: PMC9496525 DOI: 10.3390/biomedicines10092219] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/02/2022] [Accepted: 09/04/2022] [Indexed: 11/16/2022] Open
Abstract
Despite the discovery and development of an array of antimicrobial agents, multidrug resistance poses a major threat to public health and progressively increases mortality. Recently, several studies have focused on developing promising solutions to overcome these problems. This has led to the development of effective alternative methods of controlling antibiotic-resistant pathogens. The use of antimicrobial agents in combination can produce synergistic effects if each drug invades a different target or signaling pathway with a different mechanism of action. Therefore, drug combinations can achieve a higher probability and selectivity of therapeutic responses than single drugs. In this systematic review, we discuss the combined effects of different antimicrobial agents, such as plant extracts, essential oils, and nanomaterials. Furthermore, we review their synergistic interactions and antimicrobial activities with the mechanism of action, toxicity, and future directions of different antimicrobial agents in combination. Upon combination at an optimum synergistic ratio, two or more drugs can have a significantly enhanced therapeutic effect at lower concentrations. Hence, using drug combinations could be a new, simple, and effective alternative to solve the problem of antibiotic resistance and reduce susceptibility.
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Affiliation(s)
| | - Kwang-Hyun Baek
- Department of Biotechnology, Yeungnam University, Gyeongsan 38451, Korea
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Kodithuwakku P, Jayasundara D, Munaweera I, Jayasinghe R, Thoradeniya T, Weerasekera M, Ajayan PM, Kottegoda N. A Review on Recent Developments in Structural Modification of TiO2 For Food Packaging Applications. PROG SOLID STATE CH 2022. [DOI: 10.1016/j.progsolidstchem.2022.100369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Mavengere S, Kim JS. Photoreactivity improvement of TiO2/Sr4All4O25:Eu,Dy heterojunction photocatalyst by Fe doping and annealing in N2–H2 mixed gas. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-022-02542-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Compositional-dependent enhanced physicochemical and photovoltaic studies of nanocrystalline Ti1-xFexO2-δ photoelectrodes co-sensitized with CdS QDs-N719 dye. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05135-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Jafari AJ, Moslemzadeh M, Esrafili A, Kalantary RR. Synthesis of new composite based on TiO 2 immobilized in glass fibers for photo-catalytic degradation of chlorobenzene in aqueous solutions. ENVIRONMENTAL RESEARCH 2022; 204:112018. [PMID: 34536370 DOI: 10.1016/j.envres.2021.112018] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 08/26/2021] [Accepted: 09/03/2021] [Indexed: 06/13/2023]
Abstract
In this study photo-catalytic degradation of chlorobenzene from aqueous solutions using CQD decorated Fe-doped TiO2 immobilized in Glass Fibers (GF) was investigated. Characteristics of the synthesized photo-catalyst were determined by EF-SEM, EDX, BET, XRD, FTIR, and DRS analysis. Additionally, DRS analysis demonstrated adding CQD to the TiO2-Fe reduced its band gap energy from 2.96 eV to 2.91eV, while that was 3.10 eV for undoped TiO2. Among that three photo-catalysts, GF/CQD(4.5 wt%) decorated Fe-TiO2 composite had performance nearly 100.0%, when pH was 5 and low concentration of chlorobenzene. In addition, GF/CQD(4.5 wt%) decorated Fe-TiO2 composite show it could be well applied for five times and with a little reduction on the performance. Also, no detectable Fe found to be released from the composite. Minimum inhibitory concentration (MIC) for E. coli bacteria was 12.2 mg L-1 of chlorobenzene residual. Our findings show the catalyst was successful for chlorobenzene removal in the wastewater effluent. In conclusion, present hybrid composite could successfully and safely remove chlorobenzene from synthetic aqueous solution.
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Affiliation(s)
- Ahmad Jonidi Jafari
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, 1449614535, Iran; Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, 1449614535, Iran
| | - Mehrdad Moslemzadeh
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, 1449614535, Iran.
| | - Ali Esrafili
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, 1449614535, Iran
| | - Roshanak Rezaei Kalantary
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, 1449614535, Iran
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7
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Gomes SIL, Amorim MJB, Pokhrel S, Mädler L, Fasano M, Chiavazzo E, Asinari P, Jänes J, Tämm K, Burk J, Scott-Fordsmand JJ. Machine learning and materials modelling interpretation of in vivo toxicological response to TiO 2 nanoparticles library (UV and non-UV exposure). NANOSCALE 2021; 13:14666-14678. [PMID: 34533558 DOI: 10.1039/d1nr03231c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Assessing the risks of nanomaterials/nanoparticles (NMs/NPs) under various environmental conditions requires a more systematic approach, including the comparison of effects across many NMs with identified different but related characters/descriptors. Hence, there is an urgent need to provide coherent (eco)toxicological datasets containing comprehensive toxicity information relating to a diverse spectra of NPs characters. These datasets are test benches for developing holistic methodologies with broader applicability. In the present study we assessed the effects of a custom design Fe-doped TiO2 NPs library, using the soil invertebrate Enchytraeus crypticus (Oligochaeta), via a 5-day pulse via aqueous exposure followed by a 21-days recovery period in soil (survival, reproduction assessment). Obviously, when testing TiO2, realistic conditions should include UV exposure. The 11 Fe-TiO2 library contains NPs of size range between 5-27 nm with varying %Fe (enabling the photoactivation of TiO2 at energy wavelengths in the visible-light range). The NPs were each described by 122 descriptors, being a mixture of measured and atomistic model descriptors. The data were explored using single and univariate statistical methods, combined with machine learning and multiscale modelling techniques. An iterative pruning process was adopted for identifying automatically the most significant descriptors. TiO2 NPs toxicity decreased when combined with UV. Notably, the short-term water exposure induced lasting biological responses even after longer-term recovery in clean exposure. The correspondence with Fe-content correlated with the band-gap hence the reduction of UV oxidative stress. The inclusion of both measured and modelled materials data benefitted the explanation of the results, when combined with machine learning.
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Affiliation(s)
- Susana I L Gomes
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Mónica J B Amorim
- Department of Biology & CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Suman Pokhrel
- Department of Production Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
- Leibniz Institute for Materials Engineering IWT, Badgasteiner Str. 3, 28359 Bremen, Germany
| | - Lutz Mädler
- Department of Production Engineering, University of Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
- Leibniz Institute for Materials Engineering IWT, Badgasteiner Str. 3, 28359 Bremen, Germany
| | - Matteo Fasano
- Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
| | - Eliodoro Chiavazzo
- Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
| | - Pietro Asinari
- Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino 10129, Italy
- INRIM, Istituto Nazionale di Ricerca Metrologica, Strada delle Cacce 91, Torino 10135, Italy
| | - Jaak Jänes
- Department of Chemistry, University of Tartu, Ravila 14a, Tartu 50411, Estonia
| | - Kaido Tämm
- Department of Chemistry, University of Tartu, Ravila 14a, Tartu 50411, Estonia
| | - Jaanus Burk
- Department of Chemistry, University of Tartu, Ravila 14a, Tartu 50411, Estonia
| | - Janeck J Scott-Fordsmand
- Department of Bioscience, Aarhus University, Vejlsovej 25, PO BOX 314, DK-8600 Silkeborg, Denmark
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Jafari AJ, Kalantary RR, Esrafili A, Moslemzadeh M. Photo-catalytic degradation of bisphenol-a from aqueous solutions using GF/Fe-TiO 2-CQD hybrid composite. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2021; 19:837-849. [PMID: 34150276 PMCID: PMC8172741 DOI: 10.1007/s40201-021-00651-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Accepted: 03/15/2021] [Indexed: 05/13/2023]
Abstract
In this photocatalytic study, removal of bisphenol-A from aqueous solution was studied using the GF/Fe-TiO2-CQD composite. Due to its health and environmental effects, this compound should be disposed of sources that are mainly industrial wastewater. The phis-chemical properties of the composite were determined by traditional analyzes of EF-SEM, EDX, BET, XRD, FTIR and DRS. In this study, different ratios of CQD in the composite (1.5, 4.5 and 7.5 wt%), pH, and bisphenol-A concentration as variable parameters were investigated. All analyzes, EF-SEM, EDX, BET, XRD, FTIR, show that the GF/Fe-TiO2-CQD composite is well coated on glass fibers (GF) and all the elements in the catalyst are present. On the other hand, DRS analysis showed that CQD reduces the band gap of Fe-TiO2 from 2.96 eV to 2.91 eV, it was 3.10 eV for TiO2. Among different catalysts, GF/Fe-TiO2-CQD4.5wt% has the best performance. The results showed that for GF/Fe-TiO2-CQD4.5wt%, optimum for the process was at pH = 6 in low concentration of bisphenol-A. The first order model for the photocatalytic degradation process were well studied. In addition, GF/Fe-TiO2-CQD4.5wt% showed that it can be used many times with a minimal reduction in performance. As a result, the GF/Fe-TiO2-CQD4.5wt% composite can successfully remove bisphenol-A form in synthetic aqueous solution. However, it is necessary to further studies to applied that for real water source in water and wastewater treatment plants.
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Affiliation(s)
- Ahmad Jonidi Jafari
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, 1449614535 Iran
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, 1449614535 Iran
| | - Roshanak Rezaei Kalantary
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, 1449614535 Iran
| | - Ali Esrafili
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, 1449614535 Iran
| | - Mehrdad Moslemzadeh
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, 1449614535 Iran
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Khan MS, Shah JA, Riaz N, Butt TA, Khan AJ, Khalifa W, Gasmi HH, Latifee ER, Arshad M, Al-Naghi AAA, Ul-Hamid A, Arshad M, Bilal M. Synthesis and Characterization of Fe-TiO 2 Nanomaterial: Performance Evaluation for RB5 Decolorization and In Vitro Antibacterial Studies. NANOMATERIALS 2021; 11:nano11020436. [PMID: 33572142 PMCID: PMC7915575 DOI: 10.3390/nano11020436] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 02/01/2021] [Accepted: 02/03/2021] [Indexed: 12/04/2022]
Abstract
A photocatalytic system for decolorization of double azo reactive black 5 (RB5) dye and water disinfection of E. coli was developed. Sol gel method was employed for the synthesis of Fe-TiO2 photocatalysts and were characterized using thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS) and Brunauer–Emmett–Teller (BET) analysis. Results showed that photocatalytic efficiency was greatly influenced by 0.1 weight percent iron loading and 300 °C calcination temperature. The optimized reaction parameters were found to be the ambient temperature, working solution pH 6.2 and 1 mg g−1 dose to completely decolorize RB5. The isotherm studies showed that RB5 adsorption by Fe-TiO2 followed the Langmuir isotherm with maximum adsorption capacity of 42.7 mg g−1 and Kads 0.0079 L mg−1. Under illumination, the modified photocatalytic material had higher decolorization efficiency as compared to unmodified photocatalyst. Kinetic studies of the modified material under visible light irradiation indicated the reaction followed the pseudo-first-order kinetics. The illumination reaction followed the Langmuir-Hinshelwood (L-H) model as the rate of dye decolorization increased with an incremental increase in dye concentration. The L-H constant Kc was 1.5542 mg L–1∙h–1 while Kads was found 0.1317 L mg–1. The best photocatalyst showed prominent percent reduction of E. coli in 120 min. Finally, 0.1Fe-TiO2-300 could be an efficient photocatalyst and can provide a composite solution for RB5 decolorization and bacterial strain inhibition.
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Affiliation(s)
- Muhammad Saqib Khan
- Department of Environmental Sciences, Abbottabad Campus, COMSATS University Islamabad, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.), (A.J.K.)
| | - Jehanzeb Ali Shah
- Department of Environmental Sciences, Abbottabad Campus, COMSATS University Islamabad, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.), (A.J.K.)
| | - Nadia Riaz
- Department of Environmental Sciences, Abbottabad Campus, COMSATS University Islamabad, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.), (A.J.K.)
| | - Tayyab Ashfaq Butt
- Department of Civil Engineering, University of Hail, Hail 55476, Saudi Arabia; (T.A.B.); (W.K.); (H.H.G.); (E.R.L.); (A.A.A.A.-N.)
| | - Asim Jahangir Khan
- Department of Environmental Sciences, Abbottabad Campus, COMSATS University Islamabad, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.), (A.J.K.)
| | - Walid Khalifa
- Department of Civil Engineering, University of Hail, Hail 55476, Saudi Arabia; (T.A.B.); (W.K.); (H.H.G.); (E.R.L.); (A.A.A.A.-N.)
| | - Hatem Hassin Gasmi
- Department of Civil Engineering, University of Hail, Hail 55476, Saudi Arabia; (T.A.B.); (W.K.); (H.H.G.); (E.R.L.); (A.A.A.A.-N.)
| | - Enamur Rahim Latifee
- Department of Civil Engineering, University of Hail, Hail 55476, Saudi Arabia; (T.A.B.); (W.K.); (H.H.G.); (E.R.L.); (A.A.A.A.-N.)
| | - Muhammad Arshad
- National Center for Physics, Nanosciences and Technology Department, Quaid-i-Azam University Islamabad Campus, Islamabad 44000, Pakistan;
| | - Ahmed Abdullah Alawi Al-Naghi
- Department of Civil Engineering, University of Hail, Hail 55476, Saudi Arabia; (T.A.B.); (W.K.); (H.H.G.); (E.R.L.); (A.A.A.A.-N.)
| | - Anwar Ul-Hamid
- Centre for Engineering Research, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia;
| | - Muhammad Arshad
- Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Islamabad 44000, Pakistan
- Correspondence: (M.A.); (M.B.)
| | - Muhammad Bilal
- Department of Environmental Sciences, Abbottabad Campus, COMSATS University Islamabad, Abbottabad 22060, Pakistan; (M.S.K.); (J.A.S.); (N.R.), (A.J.K.)
- Correspondence: (M.A.); (M.B.)
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Albukhaty S, Al-Bayati L, Al-Karagoly H, Al-Musawi S. Preparation and characterization of titanium dioxide nanoparticles and in vitro investigation of their cytotoxicity and antibacterial activity against Staphylococcus aureus and Escherichia coli. Anim Biotechnol 2020; 33:864-870. [PMID: 33251937 DOI: 10.1080/10495398.2020.1842751] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are photo-active metallic nanoparticles becoming promising agents in modern biomedical applications. Herein, a novel process for the synthesis of TiO2 NPs with high stability was developed by a sol-gel process and to investigate their cytotoxicity and antibacterial activity. Numerous experiments have been performed to confirm the morphologies, compositions, and physicochemical properties of prepared TiO2 NPs, such as field emission scanning electron microscopy, dynamic light scattering, Zeta potential, Fourier transform infrared spectroscopy and X-ray diffraction. MTT assay was applied to assess the cytotoxicity of the prepared nanoparticles. The results indicate that the synthesized nanoparticles' diameter is about 68 nm and contains the anatase phase, in the range of 2θ from 25 to 80 °C. The hydrodynamic radius of nanoparticles is about 140.4 nm, and the zeta potential of nanoparticles is about -44.6 mV. The MTT results have not shown any toxicity; the antibacterial inhibitory effect of TiO2 NPs at 200 mg/mL concentrations exhibited superior antibacterial activity at 15.9 ± 0.1, 14.0 ± 0.1 against Staphylococcus aureus and Escherichia coli, respectively. In conclusion, colloidal solutions with high stability were successfully synthesized, contributing to decreased dimensions and increased antibacterial properties.
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Affiliation(s)
- Salim Albukhaty
- Department of Basic Sciences, University of Misan, Maysan, Iraq
| | - L Al-Bayati
- Department of Microbiology, Faculty of Medicine, University of Wassit, Wassit, Iraq
| | - H Al-Karagoly
- Department of Internal and Preventive Medicine, Veterinary Medicine College, University of Al-Qadisiyah, Diwaniyah, Iraq
| | - S Al-Musawi
- Sharafaldin Al-Musawi, Faculty of Biotechnology, Al Qasim Green University, Babylon, Iraq
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11
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Photocatalytic Reactivity of Carbon–Nitrogen–Sulfur-Doped TiO2 Upconversion Phosphor Composites. Catalysts 2020. [DOI: 10.3390/catal10101188] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Sol–gel synthesized N-doped and carbon–nitrogen–sulfur (CNS)-doped TiO2 solutions were deposited on upconversion phosphor using a dip coating method. Scanning electron microscopy (SEM) imaging showed that there was a change in the morphology of TiO2 coated on NaYF4:Yb,Er from spherical to nanorods caused by additional urea and thiourea doping reagents. Fourier transform infrared (FTIR) spectroscopy further verified the existence of nitrate–hyponitrite, carboxylate, and SO42− because of the doping effect. NaYF4:Yb,Er composites coated with N- and CNS-doped TiO2 exhibited a slight shift of UV-Vis spectra towards the visible light region. Photodecomposition of methylene blue (MB) was evaluated under 254 nm germicidal lamps and a 300 W Xe lamp with UV/Vis cut off filters. The photodegradation of toluene was evaluated on TiO2/NaYF4:Yb,Er and CNS-doped TiO2/NaYF4:Yb,Er samples under UV light illumination. The photocatalytic reactivity with CNS-doped TiO2/NaYF4:Yb,Er surpassed that of the undoped TiO2/NaYF4:Yb,Er for the MB solution and toluene. Photocatalytic activity is increased by CNS doping of TiO2, which improves light sensitization as a result of band gap narrowing due to impurity sites.
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12
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Jonidi Jafari A, Moslemzadeh M. Synthesis of Fe-Doped TiO2 for Photocatalytic Processes under UV-Visible Light: Effect of Preparation Methods on Crystal Size—A Systematic Review Study. COMMENT INORG CHEM 2020. [DOI: 10.1080/02603594.2020.1821674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Ahmad Jonidi Jafari
- Research Center for Environmental Health Technology, Iran University of Medical Sciences, Tehran, Iran
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
| | - Mehrdad Moslemzadeh
- Department of Environmental Health Engineering, School of Public Health, Iran University of Medical Sciences, Tehran, Iran
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13
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Nickel-Graphene Nanoplatelet Deposited on Carbon Fiber as Binder-Free Electrode for Electrochemical Supercapacitor Application. Polymers (Basel) 2020; 12:polym12081666. [PMID: 32727000 PMCID: PMC7463841 DOI: 10.3390/polym12081666] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/22/2020] [Accepted: 07/22/2020] [Indexed: 12/03/2022] Open
Abstract
A binder-free process for the electrode preparation for supercapacitor application was suggested by drop casting graphene nanoplatelets on a carbon fiber (GnP@CF) followed by electrodeposition of Ni nanoparticles (NPs). The microstructure of the electrode showed that Ni was homogeneously distributed over the surface of the GnP@CF. XRD analysis confirmed the cubic structure of metallic Ni NPs. The Ni-GnP@CF electrode showed excellent pseudocapacitive behavior in alkaline solution by exhibiting a specific capacitance of 480 F/g at 1.0 A/g, while it was 375 F/g for Ni@CF. The low value of series resistance of Ni-GnP@CF (1 Ω) was attributed to the high capacitance. The enhanced capacitance of the electrode could be correlated to the highly nanoporous structure of the composite material, synergetic effect of the electrical double layer charge-storage properties of graphene, and the pseudocapacitive nature of Ni NPs.
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14
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Anti-bacterial activity of inorganic nanomaterials and their antimicrobial peptide conjugates against resistant and non-resistant pathogens. Int J Pharm 2020; 586:119531. [PMID: 32540348 DOI: 10.1016/j.ijpharm.2020.119531] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2019] [Revised: 06/04/2020] [Accepted: 06/06/2020] [Indexed: 12/20/2022]
Abstract
This review details the antimicrobial applications of inorganic nanomaterials of mostly metallic form, and the augmentation of activity by surface conjugation of peptide ligands. The review is subdivided into three main sections, of which the first describes the antimicrobial activity of inorganic nanomaterials against gram-positive, gram-negative and multidrug-resistant bacterial strains. The second section highlights the range of antimicrobial peptides and the drug resistance strategies employed by bacterial species to counter lethality. The final part discusses the role of antimicrobial peptide-decorated inorganic nanomaterials in the fight against bacterial strains that show resistance. General strategies for the preparation of antimicrobial peptides and their conjugation to nanomaterials are discussed, emphasizing the use of elemental and metallic oxide nanomaterials. Importantly, the permeation of antimicrobial peptides through the bacterial membrane is shown to aid the delivery of nanomaterials into bacterial cells. By judicious use of targeting ligands, the nanomaterial becomes able to differentiate between bacterial and mammalian cells and, thus, reduce side effects. Moreover, peptide conjugation to the surface of a nanomaterial will alter surface chemistry in ways that lead to reduction in toxicity and improvements in biocompatibility.
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Boron-Doped TiO2-CNT Nanocomposites with Improved Photocatalytic Efficiency toward Photodegradation of Toluene Gas and Photo-Inactivation of Escherichia coli. Catalysts 2020. [DOI: 10.3390/catal10060632] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
An in-situ sol-gel method was used for the synthesis of boron-doped TiO2-CNT nanocomposites with varied boron concentrations from 1 to 4 mol%. The synthesized nanocomposites were characterized by various techniques, namely XRD, UV-DRS, TEM, PL, and XPS; all results show that 3 mol% B-TiO2-CNT nanocomposites have superior properties to pure TiO2, 3B-TiO2 nanoparticles, and other nanocomposites. TEM images clearly show the B-TiO2 nanoparticles decorated on the CNT surface. Photo-luminescence studies confirm that boron doping of up to 3 mol% in TiO2-CNT nanocomposites reduces the electron-hole pair recombination rate. The photocatalytic performance of the B-TiO2-CNT nanocomposites was tested against the photodegradation of toluene gas and the photocatalytic inactivation of E. coli in the presence of UV and visible light respectively. B-TiO2-CNT (3 mol%) nanocomposites show the highest photocatalytic activity.
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Zeng G, Zhang Q, Liu Y, Zhang S, Guo J. Preparation of TiO 2 and Fe-TiO 2 with an Impinging Stream-Rotating Packed Bed by the Precipitation Method for the Photodegradation of Gaseous Toluene. NANOMATERIALS 2019; 9:nano9081173. [PMID: 31426360 PMCID: PMC6724096 DOI: 10.3390/nano9081173] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2019] [Revised: 08/13/2019] [Accepted: 08/14/2019] [Indexed: 12/18/2022]
Abstract
Nano-TiO2 has always been one of the most important topics in the research of photocatalysts due to its special activity and stability. However, it has always been difficult to obtain nano-TiO2 with high dispersion, a small particle size and high photocatalytic activity. In this paper, nano-TiO2 powder was prepared by combining the high-gravity technique and direct precipitation method in an impinging stream-rotating packed bed (IS-RPB) reactor followed by Fe3+ in-situ doping. TiOSO4 and NH3·H2O solutions were cut into very small liquid microelements by high-speed rotating packing, and the mass transfer and microscopic mixing of the nucleation and growth processes of nano-TiO2 were strengthened in IS-RPB, which was beneficial to the continuous production of high quality nano-TiO2. Pure TiO2 and iron-doped nano-TiO2 (Fe-TiO2) were obtained in IS-RPB and were investigated by means of X-ray diffraction (XRD), Raman, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS) and Brunauer-Emmett-Teller (BET) analysis, which found that pure TiO2 had a particle size of about 12.5 nm, good dispersibility and a complete anatase crystal at the rotating speed of packing of 800 rpm and calcination temperature of 500 °C. The addition of Fe3+ did not change the crystalline structure of TiO2. Iron was highly dispersed in TiO2 without the detection of aggregates and was found to exist in a positive trivalent form by XPS. With the increase of iron doping, the photoresponse range of TiO2 to visible light was broadened from 3.06 eV to 2.26 eV. The degradation efficiency of gaseous toluene by Fe-TiO2 under ultraviolet light was higher than that of pure TiO2 and commercial P25 due to Fe3+ effectively suppressing the recombination of TiO2 electrons and holes; the highest efficiency produced by 1.0% Fe-TiO2 was 95.7%.
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Affiliation(s)
- Guangping Zeng
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
| | - Qiaoling Zhang
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China.
| | - Youzhi Liu
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
| | - Shaochuang Zhang
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
| | - Jing Guo
- Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering, North University of China, Taiyuan 030051, China
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Kim MH, Lee SG, Kim KS, Heo YJ, Oh JE, Jeong SJ. Environmental disinfection with photocatalyst as an adjunctive measure to control transmission of methicillin-resistant Staphylococcus aureus: a prospective cohort study in a high-incidence setting. BMC Infect Dis 2018; 18:610. [PMID: 30509196 PMCID: PMC6276245 DOI: 10.1186/s12879-018-3555-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 11/26/2018] [Indexed: 11/10/2022] Open
Abstract
Background Environmental disinfection with continuously antimicrobial surfaces could offer superior control of surface bioburden. We sought to decide the efficacy of photocatalyst antimicrobial coating in reducing methicillin-resistant Staphylococcus aureus (MRSA) acquisition in high incidence setting. Methods We performed prospective cohort study involving patients hospitalized in medical intensive care unit. A titanium dioxide-based photocatalyst was coated on high touch surfaces and walls. Five months of pre-intervention data were compared with five months of post-intervention data. The incidence rates of multidrug-resistant organism acquisition and the rates of hospital-acquired blood stream infection, pneumonia, urinary tract infection, and Clostridium difficile–associated diseases were compared using Cox proportional hazards regression analysis. Results In total, 621 patients were included. There was significant decrease in MRSA acquisition rate after photocatalyst coating (hazard ratio, 0.37; 95% confidence interval, 0.14–0.99; p = 0.04). However, clinical identification of vancomycin-resistant Enterococcus spp. and multidrug-resistant Acinetobacter baumannii did not decrease significantly. The hazard of contracting hospital-acquired pneumonia during the intervention period compared to baseline period was 0.46 (95% confidence interval, 0.23–0.94; p = 0.03). Conclusions In conclusion, MRSA rate was significantly reduced after photocatalyst coating. We provide evidence that photocatalyst disinfection can be an adjunctive measure to control MRSA acquisition in high-incidence settings. Trial registration ISRCTN Registry (ISRCTN31972004). Registered retrospectively on November 19, 2018. Electronic supplementary material The online version of this article (10.1186/s12879-018-3555-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Min Hyung Kim
- Department of Internal Medicine, Bundang Jesaeng Hospital, 180-2Seohyeon-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-774, South Korea
| | - Seong Gyu Lee
- Department of Laboratory Medicine, Bundang Jesaeng Hospital, 180-2Seohyeon-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-774, South Korea
| | - Ki Sook Kim
- Department of Infection Control Office, Bundang Jesaeng Hospital, 180-2Seohyeon-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-774, South Korea
| | - Yoon Ji Heo
- Department of Infection Control Office, Bundang Jesaeng Hospital, 180-2Seohyeon-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-774, South Korea
| | - Ji Eun Oh
- Department of Nursing, Bundang Jesaeng Hospital, 180-2Seohyeon-ro, Bundang-gu, Seongnam-si, Gyeonggi-do, 463-774, South Korea
| | - Su Jin Jeong
- Department of Internal Medicine and AIDS Research Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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Govindan K, Angelin A, Rangarajan M. Critical evaluation of mechanism responsible for biomass abatement during electrochemical coagulation (EC) process: A critical review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 227:335-353. [PMID: 30199730 DOI: 10.1016/j.jenvman.2018.08.100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 08/15/2018] [Accepted: 08/26/2018] [Indexed: 06/08/2023]
Abstract
This is a first review paper that delineates fundamental disinfection mechanism undergoes during the simple electrochemical coagulation (EC) process. The elucidation of detailed mechanistic phenomenon of EC process involved would help to enhance the disinfection efficiency. In this context, the biomass (bacteria, virus and algae) abatement mechanism by EC is critically reviewed and rationalized based on the experimental demonstration performed from the recent decade. Whereas, the effect of most significant abiotic operating parameters, dissolved contents and bacteria cell wall composition on biomass reduction are explored in detail. From these analyses, physical removal and chemical inactivation routes are identified for bacteria abatement mechanism during the EC process using sacrificial electrodes. Which includes (i) enmeshment of microbial contaminants by EC flocs, (ii) sweeping flocculation is preferentially for destabilization of negatively charged biomass, and (iii) inactivation/attenuation of micro-organism cell walls by electrochemically induced reactive oxygen species (ROS) or direct interaction of electric field. Perhaps, the overall abatement mechanism attributes due to the aforementioned phenomenon endures independently and/or synergistically during the EC process. Nonetheless, to obtain better understanding of virus and algae abatement mechanism, we require more experimental investigation on algae and virus removal. Eventually, more intensive research efforts on biomass attenuation by EC are most important to reinforce this claim.
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Affiliation(s)
- Kadarkarai Govindan
- Center of Excellence in Advanced Materials and Green Technologies, Department of Chemical Engineering and Material Science, Amrita School of Engineering Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University, Coimbatore, Tamil Nadu, 641 112, India.
| | - Arumugam Angelin
- Department of Biotechnology, Karunya Institute of Technology and Sciences, Coimbatore, 641 114, Tamil Nadu, India
| | - Murali Rangarajan
- Center of Excellence in Advanced Materials and Green Technologies, Department of Chemical Engineering and Material Science, Amrita School of Engineering Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University, Coimbatore, Tamil Nadu, 641 112, India
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19
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Abstract
TiO2 photocatalysts are limited to ultraviolet light photo-activation, however, by coupling with NaYF4:(Yb,Er) they can utilize visible light activation, but with low efficiencies. In order to enhance visible light photo-activity, CuO nanoparticles were coupled with NaYF4:(Yb,Er) by mechanical ball-milling and coated with TiO2-sol. The coupling of CuO nanoparticles with NaYF4:(Yb,Er)/TiO2 caused the formation of a NaYF4:(Yb,Er)-CuO/TiO2 composite capable of visible absorption with a remarkably reduced band gap of ~2.5 eV. The NaYF4:(Yb,Er)-CuO/TiO2 composite in H2O2 showed the most efficient methylene blue (MB) degradation efficiency of more than 99.5% after exposure to visible light.
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20
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Li S, Zhao S, Qiang S, Chen G, Chen Y, Chen Y. A novel zein/poly (propylene carbonate)/nano-TiO2 composite films with enhanced photocatalytic and antibacterial activity. Process Biochem 2018. [DOI: 10.1016/j.procbio.2018.03.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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21
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Wen J, Li Q, Li H, Chen M, Hu S, Cheng H. Nano-TiO2 Imparts Amidoximated Wool Fibers with Good Antibacterial Activity and Adsorption Capacity for Uranium(VI) Recovery. Ind Eng Chem Res 2018. [DOI: 10.1021/acs.iecr.7b04380] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Jun Wen
- Institute
of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
| | - Qiaoyu Li
- Institute
of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
- Key
Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
| | - Hao Li
- Institute
of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
| | - Min Chen
- Key
Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
- National
Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China
| | - Sheng Hu
- Institute
of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
| | - Haiming Cheng
- Key
Laboratory of Leather Chemistry and Engineering of Ministry of Education, Sichuan University, Chengdu 610065, China
- National
Engineering Laboratory for Clean Technology of Leather Manufacture, Sichuan University, Chengdu 610065, China
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Koli VB, Dhodamani AG, Delekar SD, Pawar SH. In situ sol-gel synthesis of anatase TiO 2 -MWCNTs nanocomposites and their photocatalytic applications. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.10.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Koli VB, Delekar SD, Pawar SH. Photoinactivation of bacteria by using Fe-doped TiO 2-MWCNTs nanocomposites. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2016; 27:177. [PMID: 27752971 DOI: 10.1007/s10856-016-5788-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Accepted: 10/02/2016] [Indexed: 06/06/2023]
Abstract
In this study, nanocomposites of Fe-doped TiO2 with multi-walled carbon nanotubes (0.1- 0.5 wt. %) were prepared by using sol-gel method. The structural and morphological analysis were carried out with using X-ray diffraction pattern and transmission electron microscopy, which confirm the presence of pure anatase phase and particle sizes in the range 15-20 nm. X-ray photoelectron spectroscopy was used to determine the surface compositions of the nanocomposites. UV-vis diffuse reflectance spectra confirm redshift in the optical absorption edge of nanocomposites with increasing amount of multi-walled carbon nanotubes. Nanocomposites show photoinactivation against gram-positive Bacillus subtilis as well as gram-negative Pseudomonas aeruginosa. Fe-TiO2-multi-walled carbon nanotubes (0.5 wt. %) nanocomposites show higher photoinactivation capability as compared with other nanocomposites. The photoluminescence study reveals that the Fe-TiO2-multi-walled carbon nanotubes nanocomposites are capable to generate higher rate of reactive oxygen species species than that of other nanocomposites. Our experimental results demonstrated that the Fe-TiO2-multi-walled carbon nanotubes nanocomposites act as efficient antibacterial agents against a wide range of microorganisms to prevent and control the persistence and spreading of bacterial infections.
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Affiliation(s)
- Valmiki B Koli
- Center for Interdisciplinary Research, D.Y. Patil University, Kolhapur, 416 006, India
| | - Sagar D Delekar
- Center for Interdisciplinary Research, D.Y. Patil University, Kolhapur, 416 006, India.
- Department of Chemistry, Shivaji University, Kolhapur, 416 004, India.
| | - Shivaji H Pawar
- Center for Interdisciplinary Research, D.Y. Patil University, Kolhapur, 416 006, India.
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Yadav HM, Kim JS, Pawar SH. Developments in photocatalytic antibacterial activity of nano TiO2: A review. KOREAN J CHEM ENG 2016. [DOI: 10.1007/s11814-016-0118-2] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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