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Tzevelekidis P, Theodosiou M, Papadopoulou A, Sakellis E, Boukos N, Bikogiannakis AK, Kyriakou G, Efthimiadou EK, Mitsopoulou CA. Visible-light-activated antibacterial and antipollutant properties of biocompatible Cu-doped and Ag-decorated TiO 2 nanoparticles. Heliyon 2024; 10:e35634. [PMID: 39295985 PMCID: PMC11408793 DOI: 10.1016/j.heliyon.2024.e35634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 07/29/2024] [Accepted: 08/01/2024] [Indexed: 09/21/2024] Open
Abstract
Optical and photocatalytic restrictions of anatase TiO2 nanoparticles (Nps) limit their potential applications, as antipollutant and antibacterial agents for sanitary applications, to the UV spectral region. While modification with transition metals extends the absorption capacity to the visible light spectrum, often undermines the photocatalysts' biocompatibility due to toxic ion leaching. In this study, we synthesized Cu-doped and Ag-decorated TiO2 photocatalysts by employing solvothermal (ATiO2:Cu) and sol-gel synthetic procedures (BTiO2:Ag), respectively. We acquired TiO2 Nps modified with three percentages of either Cu or Ag content, to examine the potential differentiation of their structural, photocatalytic, and biological impact. Comprehensive structural characterization supports the prevailing anatase crystalline structure of bare and modified titania nanostructures, while morphological differences are demonstrated among the different samples. Optical response in the visible region of ATiO2:Cu Nps stems from band gap narrowing and lattice-defect generation, while plasmonic effects are at play for BTiO2:Ag Nps. Their photocatalytic potential under visible light irradiation, originated from low-energy LED lamps commonly found in indoor spaces, was verified after monitoring the successful enhancement of methylene blue (MB) degradation rate. Safety assessment on immortalized healthy human keratinocyte cell line (HaCaT) revealed their biocompatibility up to a certain concentration, while reactive oxygen species (ROS) production was intensified after light irradiation. The visible-light-induced photocatalytic-driven antibacterial activity was confirmed against both gram-positive Staphylococcus aureus and gram-negative Escherichia coli.
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Affiliation(s)
- Panagiotis Tzevelekidis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Zografou, Greece
| | - Maria Theodosiou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Zografou, Greece
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", Agia Paraskevi, 15341, Greece
| | - Athina Papadopoulou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Zografou, Greece
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", Agia Paraskevi, 15341, Greece
| | - Elias Sakellis
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", Agia Paraskevi, 15341, Greece
- Section of Condensed Matter Physics, Department of Physics, National and Kapodistrian University of Athens, Athens, 15784, Greece
| | - Nikos Boukos
- Institute of Nanoscience and Nanotechnology, National Center of Scientific Research "Demokritos", Agia Paraskevi, 15341, Greece
| | | | - Georgios Kyriakou
- Department of Chemical Engineering, University of Patras, Caratheodory 1, Patras, 26504, Greece
| | - Eleni K Efthimiadou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Zografou, Greece
| | - Christiana A Mitsopoulou
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, 15771, Zografou, Greece
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2
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Li D, Li Q, Zhou Y, Zhang Q, Ye Q, Yang R, Jiang D. Shaping and Doping Metal-Organic Framework-Derived TiO 2 to Steer the Selectivity of Photocatalytic CO 2 Reduction toward CH 4. Inorg Chem 2024; 63:15398-15408. [PMID: 39096309 DOI: 10.1021/acs.inorgchem.4c02407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2024]
Abstract
Steering selectivity in photocatalytic conversion of CO2, especially toward deep reduction products, is vital to energy and environmental goals yet remains a great challenge. In this work, we demonstrate a facet-dependent photocatalytic selective reduction of CO2 to CH4 in Cu-doped TiO2 catalysts exposed with different facets synthesized by a topological transformation from MIL-125 (Ti) precursors. The optimized round cake-like Cu/TiO2 photocatalyst mainly exposed with the (001) facet exhibited a high photocatalytic CO2 reduction performance with a CH4 yield of 40.36 μmol g-1 h-1 with a selectivity of 94.1%, which are significantly higher than those of TiO2 (001) (4.70 μmol g-1 h-1 and 52.6%, respectively), Cu/TiO2 (001 + 101) (18.95 μmol g-1 h-1 and 69.6%, respectively), and Cu/TiO2 (101) (14.73 μmol g-1 h-1 and 78.9%, respectively). The results of experimental and theoretical calculations demonstrate that the Cu doping dominating the promoted separation and migration efficiencies of photogenerated charges and the preferential adsorption on (001) facets synergistically contribute to the selective reduction of CO2 to CH4. This work highlights the significance of synergy between facet engineering and ion doping in the design of high-performance photocatalysts with respect to selective reduction of CO2 to multielectron products.
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Affiliation(s)
- Di Li
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Qin Li
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Yimeng Zhou
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhangjiang 212013, China
| | - Qiong Zhang
- Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Qianjin Ye
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhangjiang 212013, China
| | - Ran Yang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhangjiang 212013, China
| | - Deli Jiang
- School of Chemistry and Chemical Engineering, Jiangsu University, Zhangjiang 212013, China
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3
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Wang C, Mouchet SR, Deparis O, Li J, Paineau E, Dragoe D, Remita H, Ghazzal MN. TiO 2 Films with Macroscopic Chiral Nematic-Like Structure Stabilized by Copper Promoting Light-Harvesting Capability for Hydrogen Generation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2402211. [PMID: 38898765 DOI: 10.1002/smll.202402211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/18/2024] [Indexed: 06/21/2024]
Abstract
Cellulose nanocrystals (CNCs) have inspired the synthesis of various advanced nanomaterials, opening opportunities for different applications. However, a simple and robust approach for transferring the long-range chiral nematic nanostructures into TiO2 photocatalyst is still fancy. Herein, a successful fabrication of freestanding TiO2 films maintaining their macroscopic chiral nematic structures after removing the CNCs biotemplate is reported. It is demonstrated that including copper acetate in the sol avoids the epitaxial growth of the lamellar-like structure of TiO2 and stabilizes the chiral nematic structure instead. The experimental results and optical simulation demonstrate an enhancement at the blue and red edges of the Fabry-Pérot reflectance peak located in the visible range. This enhancement arises from the light scattering effect induced by the formation of the chiral nematic structure. The nanostructured films showed 5.3 times higher performance in the photocatalytic hydrogen generation, compared to lamellar TiO2, and benefited from the presence of copper species for charge carriers' separation. This work is therefore anticipated to provide a simple approach for the design of chiral nematic photocatalysts and also offers insights into the electron transfer mechanisms on TiO2/CuxO with variable oxidation states for photocatalytic hydrogen generation.
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Affiliation(s)
- Cong Wang
- Université Paris-Saclay, UMR 8000 CNRS, Institut de Chimie Physique, Orsay, 91405, France
| | - Sébastien R Mouchet
- Department of Physics, and Namur Institute of Structured Matter (NISM), University of Namur, Rue de Bruxelles 61, Namur, 5000, Belgium
- School of Physics, University of Exeter, Stocker Road, Exeter, EX4 4QL, UK
| | - Olivier Deparis
- Department of Physics, and Namur Institute of Structured Matter (NISM), University of Namur, Rue de Bruxelles 61, Namur, 5000, Belgium
| | - Jingwei Li
- Université Paris-Saclay, UMR 8000 CNRS, Institut de Chimie Physique, Orsay, 91405, France
- School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, China
| | - Erwan Paineau
- Université Paris-Saclay, UMR 8502 CNRS, Laboratoire de Physique du Solide, Orsay, 91405, France
| | - Diana Dragoe
- Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire d'Orsay, Orsay, 91405, France
| | - Hynd Remita
- Université Paris-Saclay, UMR 8000 CNRS, Institut de Chimie Physique, Orsay, 91405, France
| | - Mohamed Nawfal Ghazzal
- Université Paris-Saclay, UMR 8000 CNRS, Institut de Chimie Physique, Orsay, 91405, France
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4
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Lozano-Rosas R, Ramos-Garcia R, Salazar-Morales MF, Robles-Águila MJ, Spezzia-Mazzocco T. Evaluation of antifungal activity of visible light-activated doped TiO 2 nanoparticles. Photochem Photobiol Sci 2024; 23:823-837. [PMID: 38568410 DOI: 10.1007/s43630-024-00557-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2023] [Accepted: 03/04/2024] [Indexed: 06/11/2024]
Abstract
Titanium dioxide (TiO2) is a well-known material for its biomedical applications, among which its implementation as a photosensitizer in photodynamic therapy has attracted considerable interest due to its photocatalytic properties, biocompatibility, high chemical stability, and low toxicity. However, the photoactivation of TiO2 requires ultraviolet light, which may lead to cell mutation and consequently cancer. To address these challenges, recent research has focused on the incorporation of metal dopants into the TiO2 lattice to shift the band gap to lower energies by introducing allowed energy states within the band gap, thus ensuring the harnessing of visible light. This study presents the synthesis, characterization, and application of TiO2 nanoparticles (NPs) in their undoped, doped, and co-doped forms for antimicrobial photodynamic therapy (APDT) against Candida albicans. Blue light with a wavelength of 450 nm was used, with doses ranging from 20 to 60 J/cm2 and an NP concentration of 500 µg/ml. It was observed that doping TiO2 with Cu, Fe, Ag ions, and co-doping Cu:Fe into the TiO2 nanostructure enhanced the visible light photoactivity of TiO2 NPs. Experimental studies were done to investigate the effects of different ions doped into the TiO2 crystal lattice on their structural, optical, morphological, and chemical composition for APDT applications. In particular, Ag-doped TiO2 emerged as the best candidate, achieving 90-100% eradication of C. albicans.
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Affiliation(s)
- Ricardo Lozano-Rosas
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Departamento de Óptica, Luis Enrique Erro #1 Sta María Tonantzintla, 72840, Puebla, Mexico
| | - Rubén Ramos-Garcia
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Departamento de Óptica, Luis Enrique Erro #1 Sta María Tonantzintla, 72840, Puebla, Mexico
| | - Mayra F Salazar-Morales
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Departamento de Óptica, Luis Enrique Erro #1 Sta María Tonantzintla, 72840, Puebla, Mexico
| | - María Josefina Robles-Águila
- Centro de Investigación en Dispositivos Semiconductores, Benemérita Universidad Autónoma de Puebla, Instituto de Ciencias, Edificio 105 C, Boulevard 14 Sur y Av. San Claudio, Col. San Manuel, C. P. 72570, Puebla, Puebla, Mexico
| | - Teresita Spezzia-Mazzocco
- Instituto Nacional de Astrofísica, Óptica y Electrónica, Departamento de Óptica, Luis Enrique Erro #1 Sta María Tonantzintla, 72840, Puebla, Mexico.
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5
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Sahoo S, Surbhi K, Bhakta S, Das R, Sahoo PK. Influence of defects on the linear and nonlinear optical properties of Cu-doped rutile TiO 2 microflowers. Phys Chem Chem Phys 2024; 26:10191-10201. [PMID: 38497147 DOI: 10.1039/d3cp05693g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Defects and disorder work as controlling parameters to alter the electronic structure of nanostructures and significantly influence their electronic, magnetic, and nonlinear optical (NLO) properties. In this study, we found that defect engineering is an effective strategy for tailoring the linear and nonlinear optical properties of Cu-doped titanium oxide (TiO2) flower-shaped nanostructures. The concentration of chemical doping of Cu in the TiO2 lattice creates intermediate defect states that impact electronic bandgap reduction and tunable defect luminescence. The estimation of the bandgap from density functional theory calculation follows the same trend of bandgap narrowing with Cu doping. The XPS study reveals that oxygen defects are responsible for bandgap narrowing and quenching of the PL intensity. A single-beam Z-scan technique with open and closed aperture configurations using ultrashort pulses centered at 532 nm excitation wavelength was used to study the NLO measurements. The open aperture reveals saturable absorption, whereas the closed aperture shows self-focusing behavior. The nonlinear absorption coefficient and refractive index extracted from NLO measurements demonstrate the linear dependence on the defect concentration and bandgap. The effects of heterogeneous dopants and lattice disorder on the nonlinear absorption behavior of these nanostructures are discussed in comparison with the figure of merit, non-linear refractive index, and absorption coefficient. The tunable NLO properties achieved by controlling such dopant-induced defects boost the scope of these nanostructures as optical limiting, optical switching, and optical photodiode applications.
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Affiliation(s)
- Subhashree Sahoo
- School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni-752050, Odisha, India.
| | - Km Surbhi
- School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni-752050, Odisha, India.
| | - Sourav Bhakta
- School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni-752050, Odisha, India.
| | - Ritwick Das
- School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni-752050, Odisha, India.
| | - Pratap K Sahoo
- School of Physical Sciences, National Institute of Science Education and Research (NISER) Bhubaneswar, An OCC of Homi Bhabha National Institute, Jatni-752050, Odisha, India.
- Center for Interdisciplinary Sciences (CIS), NISER Bhubaneswar, HBNI, Jatni-752050, Odisha, India
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6
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Lee SH, Na KH, Kim JY, Yoon HS, Han H, Choi WY. Fabrication and Characterization of Electrospun Cu-Doped TiO 2 Nanofibers and Enhancement of Photocatalytic Performance Depending on Cu Content and Electron Beam Irradiation. Polymers (Basel) 2024; 16:694. [PMID: 38475377 DOI: 10.3390/polym16050694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/23/2024] [Indexed: 03/14/2024] Open
Abstract
Titanium dioxide (TiO₂) is a widely studied material with many attractive properties such as its photocatalytic features. However, its commercial use is limited due to issues such as deactivation in the visible spectrum caused by its wide bandgap and the short lifetime of photo-excited charge carriers. To overcome these challenges, various modifications could be considered. In this study, we investigated copper doping and electron beam treatment. As-spun TiO2 nanofibers were fabricated by electrospinning a TiO2 sol, which obtained viscosity through a polyvinylpyrrolidone (PVP) matrix. Cu-doped TiO2 nanofibers with varying dopant concentrations were synthesized by adding copper salts. Then, the as-spun nanofibers were calcined for crystallization. To evaluate photocatalytic performance, a photodegradation test of methylene blue aqueous solution was performed for 6 h. Methylene blue concentration was measured over time using UV-Vis spectroscopy. The results showed that Cu doping at an appropriate concentration and electron-beam irradiation showed improved photocatalytic efficiency compared to bare TiO2 nanofibers. When the molar ratio of Cu/Ti was 0.05%, photodegradation rate was highest, which was 10.39% higher than that of bare TiO2. As a result of additional electron-beam treatment of this sample, photocatalytic efficiency improved up to 8.93% compared to samples without electron-beam treatment.
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Affiliation(s)
- So-Hyeon Lee
- Department of Advanced Materials Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
| | - Kyeong-Han Na
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
- Research Institute for Dental Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
| | - Jae-Yoon Kim
- Department of Advanced Materials Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
| | - Han-Sol Yoon
- Department of Advanced Materials Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
| | - HyukSu Han
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Won-Youl Choi
- Department of Advanced Materials Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
- Smart Hydrogen Energy Center, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
- Research Institute for Dental Engineering, Gangneung-Wonju National University, 7 Jukheongil, Gangneung 25457, Republic of Korea
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7
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Eessaa AK, Elkady OA, El-Shamy AM. Powder metallurgy as a perfect technique for preparation of Cu-TiO 2 composite by identifying their microstructure and optical properties. Sci Rep 2023; 13:7034. [PMID: 37120645 PMCID: PMC10148873 DOI: 10.1038/s41598-023-33999-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 04/22/2023] [Indexed: 05/01/2023] Open
Abstract
Powder metallurgy (PM) is a technique that involves the manufacturing of metal powders and their consolidation into finished products or components. This process involves the mixing of metal powders with other materials such as ceramics or polymers, followed by the application of heat and pressure to produce a solid, dense material. The use of PM has several advantages over traditional manufacturing techniques, including the ability to create complex shapes and the production of materials with improved properties. Cu-TiO2 composite materials are of great interest due to their unique properties, such as high electrical conductivity, improved mechanical strength, and enhanced catalytic activity. The synthesis of Cu-TiO2 composites using the PM technique has been gaining popularity in recent years due to its simplicity, cost-effectiveness, and ability to produce materials with excellent homogeneity. The novelty of using the PM technique for the preparation of Cu-TiO2 composite lies in the fact that it enables the production of materials with controlled microstructures and optical properties. The microstructure of the composite can be fine-tuned by controlling the particle size and distribution of the starting powders, as well as the processing parameters such as temperature, pressure, and sintering time. The optical properties of the composite can also be tailored by adjusting the size and distribution of the TiO2 particles, which can be used to control the absorption and scattering of light. This makes Cu-TiO2 composites particularly useful for applications such as photocatalysis and solar energy conversion. In summary, the use of Powder Metallurgy for the preparation of Cu-TiO2 composite is a novel and effective technique for producing materials with controlled microstructures and optical properties. The unique properties of Cu-TiO2 composites make them attractive for a wide range of applications in various fields, including energy, catalysis, and electronics.
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Affiliation(s)
- Ashraf K Eessaa
- Nanotechnology central lab, Electronics Research Institute (ERI), Cairo, Egypt
| | - Omayma A Elkady
- Powder Technology Department, Center Metallurgical Research & Development Institute (CMRDI), Cairo, Egypt
| | - A M El-Shamy
- Physical Chemistry Department, Electrochemistry and Corrosion Lab., National Research Centre, El-Bohouth St. 33, Dokki, P. O. 12622, Giza, Egypt.
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8
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Wang F, Yang S, Lu Q, Liu W, Sun P, Wang Q, Cao W. Colloidal Cu-doped TiO2 nanocrystals containing oxygen vacancies for highly-efficient photocatalytic degradation of benzene and antibacterial. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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9
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Preda S, Pandele-Cușu J, Petrescu SV, Ciobanu EM, Petcu G, Culiță DC, Apostol NG, Costescu RM, Raut I, Constantin M, Predoană L. Photocatalytic and Antibacterial Properties of Doped TiO2 Nanopowders Synthesized by Sol−Gel Method. Gels 2022; 8:gels8100673. [PMID: 36286174 PMCID: PMC9601293 DOI: 10.3390/gels8100673] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Revised: 10/15/2022] [Accepted: 10/15/2022] [Indexed: 11/16/2022] Open
Abstract
For environmental applications, nanosized TiO2-based materials are known as the most important photocatalyst and are intensively studied for their advantages such as their higher activity, lower price, and chemical and photoresist properties. Zn or Cu doped TiO2 nanoparticles with anatase crystalline structure were synthesized by sol−gel process. Titanium (IV) butoxide was used as a TiO2 precursor, with parental alcohol as a solvent, and a hydrolysing agent (ammonia-containing water) was added to obtain a solution with pH 10. The gels were characterized by TG/DTA analysis, SEM, and XPS. Based on TG/DTA results, the temperature of 500 °C was chosen for processing the powders in air. The structure of the samples thermally treated at 500 °C was analysed by XRD and the patterns show crystallization in a single phase of TiO2 (anatase). The surface of the samples and the oxidation states was investigated by XPS, confirming the presence of Ti, O, Zn and Cu. The antibacterial activity of the nanoparticle powder samples was verified using the gram−positive bacterium Staphylococcus aureus. The photocatalytic efficiency of the doped TiO2 nanopowders for degradation of methyl orange (MO) is here examined in order to evaluate the potential applications of these materials for environmental remediation.
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Affiliation(s)
- Silviu Preda
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Jeanina Pandele-Cușu
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Simona Viorica Petrescu
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Elena Mădălina Ciobanu
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Gabriela Petcu
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Daniela C. Culiță
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Nicoleta G. Apostol
- National Institute of Materials Physics, Atomiștilor 405A, 077125 Măgurele, Romania
| | - Ruxandra M. Costescu
- National Institute of Materials Physics, Atomiștilor 405A, 077125 Măgurele, Romania
| | - Iuliana Raut
- National Institute for Research & Development in Chemistry & Petrochemistry−ICECHIM, 202 Splaiul Independenței, 060021 Bucharest, Romania
| | - Mariana Constantin
- National Institute for Research & Development in Chemistry & Petrochemistry−ICECHIM, 202 Splaiul Independenței, 060021 Bucharest, Romania
- Faculty of Pharmacy, “Titu Maiorescu” University, 16 Gh. Sincai, 040441 Bucharest, Romania
| | - Luminița Predoană
- Institute of Physical Chemistry “Ilie Murgulescu” of the Romanian Academy, 202 Splaiul Independenței, 060021 Bucharest, Romania
- Correspondence: ; Tel.: +4-021-318-85-95
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10
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Kanoun MB, Alshoaibi A, Goumri-Said S. Hybrid Density Functional Investigation of Cu Doping Impact on the Electronic Structures and Optical Characteristics of TiO 2 for Improved Visible Light Absorption. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5645. [PMID: 36013781 PMCID: PMC9412576 DOI: 10.3390/ma15165645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 08/03/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
We report a theoretical investigation of the influence of Cu doping into TiO2 with various concentrations on crystal structure, stability, electronic structures and optical absorption coefficient using density functional theory via the hybrid formalism based on Heyd Scuseria Ernzerhof. Our findings show that oxygen-rich environments are better for fabricating Cu-doped materials and that the energy of formation for Cu doping at the Ti site is lower than for Cu doping at the O site under these environments. It is found that Cu doping introduces intermediate bands into TiO2, narrowing the band gap. Optical absorption curves show that the Cu-doped TiO2 can successfully harvest visible light. The presence of widely intermediate bands above the valence-band edge could explain the increase in the visible light absorption range. However, the intensity of visible light absorption rises with the increase in doping concentration.
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Affiliation(s)
- Mohammed Benali Kanoun
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Adil Alshoaibi
- Department of Physics, College of Science, King Faisal University, P.O. Box 400, Al-Ahsa 31982, Saudi Arabia
| | - Souraya Goumri-Said
- Physics Department, College of Science, Alfaisal University, P.O. Box 50927, Riyadh 11533, Saudi Arabia
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11
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Plasmon-Enhanced Efficiency of DSSC and Hybrid Nano Catalysis Applications. Top Catal 2022. [DOI: 10.1007/s11244-022-01678-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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12
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Fabrication and characterization of Ag- and Cu-doped TiO2 nanotubes (NTs) by in situ anodization method as an efficient photocatalyst. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05237-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Hamad H, Elsenety MM, Sadik W, El-Demerdash AG, Nashed A, Mostafa A, Elyamny S. The superior photocatalytic performance and DFT insights of S-scheme CuO@TiO 2 heterojunction composites for simultaneous degradation of organics. Sci Rep 2022; 12:2217. [PMID: 35140284 PMCID: PMC8828870 DOI: 10.1038/s41598-022-05981-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2021] [Accepted: 01/21/2022] [Indexed: 12/25/2022] Open
Abstract
The necessity to resolve the issue of rapid charge carrier recombination for boosting photocatalytic performance is a vigorous and challenging research field. To address this, the construction of a binary system of step-scheme (S-scheme) CuO@TiO2 heterostructure composite has been demonstrated through a facile solid-state route. The remarkably enhanced photocatalytic performance of CuO@TiO2, compared with single TiO2, which can consequence in the more efficient separation of photoinduced charge carriers, reduced the band gap of TiO2, improved the electrical transport performance, and improved the lifetimes, thus donating it with the much more powerful oxidation and reduction capability. A photocatalytic mechanism was proposed to explain the boosted photocatalytic performance of CuO@TiO2 on a complete analysis of physicochemical, DFT calculations, and electrochemical properties. In addition, this work focused on the investigation of the stability and recyclability of CuO@TiO2 in terms of efficiency and its physical origin using XRD, BET, and XPS. It is found that the removal efficiency diminishes 4.5% upon five recycling runs. The current study not only promoted our knowledge of the binary system of S-scheme CuO@TiO2 heterojunction composite photocatalyst but also shed new light on the design of heterostructure photocatalysts with high-performance and high stability.
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Affiliation(s)
- Hesham Hamad
- Fabrication Technology Research Department, Advanced Technology and New Materials Research Institute (ATNMRI), City of Scientific Research and Technological Applications (SRTA-City), New Borg El-Arab City, Alexandria, 21934, Egypt.
| | - Mohamed M Elsenety
- Department of Chemistry, Faculty of Science, Al-Azhar University, P.O. 11823, Nasr City, Cairo, Egypt
| | - Wagih Sadik
- Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria, Egypt
| | - Abdel-Ghaffar El-Demerdash
- Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria, Egypt
| | - Adel Nashed
- Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria, Egypt
| | - Amr Mostafa
- Materials Science Department, Institute of Graduate Studies and Research (IGSR), Alexandria University, Alexandria, Egypt
| | - Shaimaa Elyamny
- Electronic Materials Research Department, Advanced Technology and New Materials Research Institute, City of Scientific Research and Technological Applications (SRTA-City), P.O. Box 21934, New Borg El-Arab City, Alexandria, Egypt
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14
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Jia S, Pu G, Xiong W, Wang P, Gao J, Yuan C. Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c01012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shuaihui Jia
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Ge Pu
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Weicheng Xiong
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Pengcheng Wang
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Jie Gao
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
| | - Cong Yuan
- Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400044, P. R. China
- School of Energy and Power Engineering, Chongqing University, Chongqing 400044, P. R. China
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15
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Baron FA, Mikhlin YL, Molokeev MS, Rautskiy MV, Tarasov IA, Volochaev MN, Shanidze LV, Lukyanenko AV, Smolyarova TE, Konovalov SO, Zelenov FV, Tarasov AS, Volkov NV. Structural, Optical, and Electronic Properties of Cu-Doped TiN xO y Grown by Ammonothermal Atomic Layer Deposition. ACS APPLIED MATERIALS & INTERFACES 2021; 13:32531-32541. [PMID: 34181393 DOI: 10.1021/acsami.1c08036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Copper-doped titanium oxynitride (TiNxOy) thin films were grown by atomic layer deposition (ALD) using the TiCl4 precursor, NH3, and O2 at 420 °C. Forming gas was used to reduce the background oxygen concentration and to transfer the copper atoms in an ALD chamber prior to the growth initiation of Cu-doped TiNxOy. Such forming gas-mediated Cu-doping of TiNxOy films had a pronounced effect on their resistivity, which dropped from 484 ± 8 to 202 ± 4 μΩ cm, and also on the resistance temperature coefficient (TCR), which decreased from 1000 to 150 ppm °C-1. We explored physical mechanisms causing this reduction by performing comparative analysis of atomic force microscopy, X-ray photoemission spectroscopy, X-ray diffraction, optical spectra, low-temperature transport, and Hall measurement data for the samples grown with and without forming gas doping. The difference in the oxygen concentration between the films did not exceed 6%. Copper segregated to the TiNxOy surface where its concentration reached 0.72%, but its penetration depth was less than 10 nm. Pronounced effects of the copper doping by forming gas included the TiNxOy film crystallite average size decrease from 57-59 to 32-34 nm, considerably finer surface granularity, electron concentration increase from 2.2(3) × 1022 to 3.5(1) × 1022 cm-3, and the electron mobility improvement from 0.56(4) to 0.92(2) cm2 V-1 s-1. The DC resistivity versus temperature R(T) measurements from 4.2 to 300 K showed a Cu-induced phase transition from a disordered to semimetallic state. The resistivity of Cu-doped TiNxOy films decreased with the temperature increase at low temperatures and reached the minimum near T = 50 K revealing signatures of the quantum interference effects similar to 2D Cu thin films, and then, semimetallic behavior was observed at higher temperatures. In TiNxOy films grown without forming gas, the resistivity decreased with the temperature increase as R(T) = - 1.88T0.6 + 604 μΩ cm with no semimetallic behavior observed. The medium range resistivity and low TCR of Cu-doped TiNxOy make this material an attractive choice for improved matching resistors in RF analog circuits and Si complementary metal-oxide-semiconductor integrated circuits.
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Affiliation(s)
- Filipp A Baron
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
| | - Yurii L Mikhlin
- Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
| | - Maxim S Molokeev
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
- Siberian Federal University, Krasnoyarsk 660041, Russia
| | - Mikhail V Rautskiy
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
| | - Ivan A Tarasov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
| | - Mikhail N Volochaev
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
- Reshetnev Siberian State University of Science and Technology, Krasnoyarsk 660037, Russia
| | - Lev V Shanidze
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
| | - Anna V Lukyanenko
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
- Siberian Federal University, Krasnoyarsk 660041, Russia
| | - Tatiana E Smolyarova
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
- Siberian Federal University, Krasnoyarsk 660041, Russia
| | - Stepan O Konovalov
- Reshetnev Siberian State University of Science and Technology, Krasnoyarsk 660037, Russia
| | - Fyodor V Zelenov
- Reshetnev Siberian State University of Science and Technology, Krasnoyarsk 660037, Russia
| | - Anton S Tarasov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
- Siberian Federal University, Krasnoyarsk 660041, Russia
| | - Nikita V Volkov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
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16
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Cheng C, Fang WH, Long R, Prezhdo OV. Water Splitting with a Single-Atom Cu/TiO 2 Photocatalyst: Atomistic Origin of High Efficiency and Proposed Enhancement by Spin Selection. JACS AU 2021; 1:550-559. [PMID: 34467318 PMCID: PMC8395698 DOI: 10.1021/jacsau.1c00004] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Indexed: 05/26/2023]
Abstract
Anatase TiO2 is an intensely investigated photocatalytic material due to its abundance and chemical stability. However, it suffers from weak light harvesting and low photocatalytic efficiency. Experiments show that light absorption and photocatalytic properties can be enhanced simultaneously by TiO2 doping with well-dispersed Cu atoms, forming a single-atom catalyst (Cu/TiO2) that can be used for solar water splitting and other applications. By performing ab initio nonadiabatic molecular dynamics simulations, we demonstrate that Cu/TiO2 is inactive before light irradiation due to rapid electron-hole recombination via both shallow and deep traps. Surprisingly, the shallow trap is more detrimental to the Cu/TiO2 performance than the deep trap because it couples better to free carriers. After light irradiation, leading to electron transfer and Cu/TiO2 protonation, the shallow trap is eliminated, and a local distortion around the Cu atom stabilizes the deep trap state on the Cu d-orbital, decoupling it from free charges and giving rise to high photocatalytic hydrogen generation activity. We further demonstrate that the photocatalytic performance of Cu/TiO2 can be enhanced by spin selection, achievable experimentally via optical intersite spin transfer or chiral semiconductor coating. Both H adsorption and spin selection enhance charge carrier lifetimes by an order of magnitude. The spin selection mechanism does not require formation of the H species, which necessitates concurrent sources of electrons and protons and which is intrinsically unstable because water splitting involves frequent proton shuffling. Our results rationalize the experimental observations at the atomistic level, provide mechanistic insights into operation of single atom photocatalysis, and demonstrate that spin selection can be used to develop advanced and efficient systems for solar energy conversion.
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Affiliation(s)
- Cheng Cheng
- College
of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry
of Ministry of Education, Beijing Normal
University, Beijing 100875, P.R. China
| | - Wei-Hai Fang
- College
of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry
of Ministry of Education, Beijing Normal
University, Beijing 100875, P.R. China
| | - Run Long
- College
of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry
of Ministry of Education, Beijing Normal
University, Beijing 100875, P.R. China
| | - Oleg V. Prezhdo
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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17
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Kakil SA, Abdullah HY, Abdullah TG, Manini N. Subsurface depth dependence of nitrogen doping in TiO 2anatase: a DFT study. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:205703. [PMID: 33242842 DOI: 10.1088/1361-648x/abce41] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 11/26/2020] [Indexed: 06/11/2023]
Abstract
We report first-principles calculations of the structure and electronic structure of nitrogen-doped TiO2anatase as a function of the dopant depth below the (101) surface. Specifically we evaluate the depth dependence of the formation energy for a few positions of the N impurity, considering for both substitutional and interstitial sites. We find a significant advantage of interstitial over substitutional positions, and a mild dependence of this formation energy on depth. The lengths of the bonds surrounding the impurity also evolve smoothly with depth. Regarding the electronic structure, we report the main features of the intragap impurity states and the hole-related spin magnetization density surrounding the N impurity.
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Affiliation(s)
- Shaida Anwer Kakil
- Department of Physics, College of Science Salahaddin University, 44001 Erbil, Iraq
- Research Center, Salahaddin University, 44001 Erbil, Iraq
| | - Hewa Y Abdullah
- Research Center, Salahaddin University, 44001 Erbil, Iraq
- Physics Education Department, Faculty of Education, Tishk International University, 44001 Erbil, Iraq
| | - Tahseen G Abdullah
- Department of Physics, College of Science Salahaddin University, 44001 Erbil, Iraq
| | - Nicola Manini
- Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, 20133 Milano, Italy
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18
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Cu+ based active sites of different oxides supported Pd-Cu catalysts and electrolytic in-situ H2 evolution for high-efficiency nitrate reduction reaction. J Catal 2020. [DOI: 10.1016/j.jcat.2020.10.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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19
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Marine Antibiofouling Properties of TiO2 and Ti-Cu-O Films Deposited by Aerosol-Assisted Chemical Vapor Deposition. COATINGS 2020. [DOI: 10.3390/coatings10080779] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The actual interest in developing light-induced catalytic coatings to act as an antibiofouling alternative has recently prompted interest in the incorporation of Cu into TiO2 films, working as a visible light sensitizer catalyst. TiO2 and new Ti-Cu-O films with Cu contents ranging between 16% and 75% Cu/(Cu + Ti) are deposited by aerosol-assisted metalorganic chemical vapor deposition at a substrate temperature of 550 °C. The films are composed of TiO2 anatase phase, mixed with Cu2O when including Cu in the composition. Pure TiO2 films’ morphologies are characterized by the formation of microflower-like structures with nanometric petals, which induce a high specific surface. These features are not present in Ti-Cu-O films. A UV-Visible study revealed that the optical band gap energy decreases with increasing Cu content. Interestingly, Ti-Cu-O films presented a highly photo-catalytic activity in the orange-G degradation. Marine biofouling field tests in Lorient’s Harbor in France and in vitro tests were carried out in order to evaluate the antifouling performance of the films, revealing that topography and chemical composition can act differently on different species. Field tests revealed that TiO2 microflowers reduced the fouling coverage. Besides, Ti-Cu-O films with 16 at.% Cu presented lower fouling coverage than films containing 58 at.% Cu. In vitro tests using two diatoms (P. tricornutum and N. perminuta) showed that the spaces between microflowers play a significant role in the adhesion of diatoms: microalgae adhere less when spaces are bigger than their cells, compared to when spaces are of the same size as cells. Films containing Cu did not alter N. perminuta growth nor adhesion, while they affected P. tricornutum by lowering its growth rate and adhesion without noticeable toxicity. Indeed, Cu-Ti-O is a very promising non-toxic fouling release film for marine and industrial applications.
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20
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21
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Belekbir S, El Azzouzi M, El Hamidi A, Rodríguez-Lorenzo L, Santaballa JA, Canle M. Improved Photocatalyzed Degradation of Phenol, as a Model Pollutant, over Metal-Impregnated Nanosized TiO 2. NANOMATERIALS 2020; 10:nano10050996. [PMID: 32455949 PMCID: PMC7279559 DOI: 10.3390/nano10050996] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/10/2020] [Accepted: 05/18/2020] [Indexed: 11/28/2022]
Abstract
Photocatalyzed degradation of phenol in aqueous solution over surface impregnated TiO2 (M = Cu, Cr, V) under UV-Vis (366 nm) and UV (254 nm) irradiation is described. Nanosized photocatalyts were prepared from TiO2-P25 by wet impregnation, and characterized by X-ray diffraction, X-ray fluorescence, transmission electron microscopy, UV-Vis diffuse reflectance spectroscopy, Raman spectroscopy, and adsorption studies. No oxide phases of the metal dopants were found, although their presence in the TiO2-P25 lattice induces tensile strain in Cu-impregnated TiO2-P25, whereas compressive strain in Cr- and V-impregnated TiO2-P25. Experimental evidences support chemical and mechanical stability of the photocatalysts. Type IV N2 adsorption–desorption isotherms, with a small H3 loop near the maximum relative pressure were observed. Metal surface impregnated photocatalysts are mesoporous with a similar surface roughness, and a narrow pore distribution around ca. 25 Å. They were chemically stable, showing no metal lixiviation. Their photocatalytic activity was followed by UV-Vis spectroscopy and HPLC–UV. A first order kinetic model appropriately fitted the experimental data. The fastest phenol degradation was obtained with M (0.1%)/TiO2-P25, the reactivity order being Cu > V >> Cr > TiO2-P25 under 366 nm irradiation, while TiO2-P25 > Cu > V > Cr, when using 254 nm radiation. TOC removal under 366 nm irradiation for 300 min showed almost quantitative mineralization for all tested materials, while 254 nm irradiation for 60 min led to maximal TOC removal (ca. 30%). Photoproducts and intermediate photoproducts were identified by HPLC–MS, and appropriate reaction pathways are proposed. The energy efficiency of the process was analysed, showing UV lamps are superior to UVA lamps, and that the efficiency of the surface impregnated catalyst varies in the order Cu > V > Cr.
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Affiliation(s)
- S. Belekbir
- Laboratoire de Physico-Chimie des Matériaux et Nanomateriaux, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, Rabat BP 1014, Morocco; (S.B.); (M.E.A.); (A.E.H.)
| | - M. El Azzouzi
- Laboratoire de Physico-Chimie des Matériaux et Nanomateriaux, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, Rabat BP 1014, Morocco; (S.B.); (M.E.A.); (A.E.H.)
| | - A. El Hamidi
- Laboratoire de Physico-Chimie des Matériaux et Nanomateriaux, Faculté des Sciences, Université Mohammed V, Avenue Ibn Battouta, Rabat BP 1014, Morocco; (S.B.); (M.E.A.); (A.E.H.)
| | | | - J. Arturo Santaballa
- Grupo React!, Departamento de Química, Facultade de Ciencias & CICA, Universidade da Coruña, E-15071 A Coruña, Spain;
| | - M. Canle
- Grupo React!, Departamento de Química, Facultade de Ciencias & CICA, Universidade da Coruña, E-15071 A Coruña, Spain;
- Correspondence:
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22
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Relaxation dynamics of photoexcitations in TiO2 and its composites with Au/carbon nanotube (graphene). CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.105970] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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23
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Dispersion of Defects in TiO2 Semiconductor: Oxygen Vacancies in the Bulk and Surface of Rutile and Anatase. Catalysts 2020. [DOI: 10.3390/catal10040397] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Oxygen deficiency (O-vacancy) contributes to the photoefficiency of TiO2 semiconductors by generating electron rich active sites. In this paper, the dispersion of O-vacancies in both bulk and surface of anatase and rutile phases was computationally investigated. The results showed that the O-vacancies dispersed in single- and double-cluster forms in the anatase and rutile phases, respectively, in both bulk and surface. The distribution of the O-vacancies was (roughly) homogeneous in anatase, and heterogenous in rutile bulk. The O-vacancy formation energy, width of defect band, and charge distribution indicated the overlap of the defect states in the rutile phase and thus eased the formation of clusters. Removal of the first and the second oxygen atoms from the rutile surface took less energy than the anatase one, which resulted in a higher deficiency concentration on the rutile surface. However, these deficiencies formed one active site per unit cell of rutile. On the other hand, the first O-vacancy formed on the surface and the second one formed in the subsurface of anatase (per unit cell). Supported by previous studies, we argue that this distribution of O-vacancies in anatase (surface and subsurface) could potentially create more active sites on its surface.
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24
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Alotaibi A, Williamson BAD, Sathasivam S, Kafizas A, Alqahtani M, Sotelo-Vazquez C, Buckeridge J, Wu J, Nair SP, Scanlon DO, Parkin IP. Enhanced Photocatalytic and Antibacterial Ability of Cu-Doped Anatase TiO 2 Thin Films: Theory and Experiment. ACS APPLIED MATERIALS & INTERFACES 2020; 12:15348-15361. [PMID: 32109038 PMCID: PMC7146757 DOI: 10.1021/acsami.9b22056] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2019] [Accepted: 02/28/2020] [Indexed: 05/12/2023]
Abstract
Multifunctional thin films which can display both photocatalytic and antibacterial activity are of great interest industrially. Here, for the first time, we have used aerosol-assisted chemical vapor deposition to deposit highly photoactive thin films of Cu-doped anatase TiO2 on glass substrates. The films displayed much enhanced photocatalytic activity relative to pure anatase and showed excellent antibacterial (vs Staphylococcus aureus and Escherichia coli) ability. Using a combination of transient absorption spectroscopy, photoluminescence measurements, and hybrid density functional theory calculations, we have gained nanoscopic insights into the improved properties of the Cu-doped TiO2 films. Our analysis has highlighted that the interactions between substitutional and interstitial Cu in the anatase lattice can explain the extended exciton lifetimes observed in the doped samples and the enhanced UV photoactivities observed.
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Affiliation(s)
- Abdullah
M. Alotaibi
- Materials
Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- The
National Centre for Building and Construction Technology, King Abdulaziz City for Science and Technology (KACST), Riyadh 11442-6086, Saudi Arabia
| | - Benjamin A. D. Williamson
- Department
of Chemistry, Christopher Ingold Building, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Thomas
Young Centre, University College London, Gower Street, London WC1E 6BT, U.K.
| | - Sanjayan Sathasivam
- Materials
Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| | - Andreas Kafizas
- Grantham Institute,
Imperial College
London, Exhibition Road, London SW7 2AZ, U.K.
| | - Mahdi Alqahtani
- Electronic
& Electrical Engineering, University
College London, Torrington
Place, London WC1E 7JE, U.K.
- Materials
Science Research Institute, King Abdulaziz
City for Science and Technology (KACST), Riyadh 11442-6086, Saudi Arabia
| | - Carlos Sotelo-Vazquez
- Materials
Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| | - John Buckeridge
- School
of Engineering, London South Bank University, 103 Borough Road, London SE1 0AA, U.K.
| | - Jiang Wu
- Electronic
& Electrical Engineering, University
College London, Torrington
Place, London WC1E 7JE, U.K.
- University
of Electronic Science and Technology of China, North Jianshe Road, Chengdu 610054, China
| | - Sean P. Nair
- Department
of Microbial Diseases, UCL Eastman Dental
Institute, 256 Gray’s
Inn Road, London WC1X 8LD, U.K.
| | - David O. Scanlon
- Department
of Chemistry, Christopher Ingold Building, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- Thomas
Young Centre, University College London, Gower Street, London WC1E 6BT, U.K.
- Diamond Light Source Ltd., Diamond House, Harwell Science and
Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K.
| | - Ivan P. Parkin
- Materials
Chemistry Centre, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
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25
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Fang Y, Chi X, Li L, Yang J, Liu S, Lu X, Xiao W, Wang L, Luo Z, Yang W, Hu S, Xiong J, Hoang S, Deng H, Liu F, Zhang L, Gao P, Ding J, Guo Y. Elucidating the Nature of the Cu(I) Active Site in CuO/TiO 2 for Excellent Low-Temperature CO Oxidation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:7091-7101. [PMID: 31931575 DOI: 10.1021/acsami.9b18264] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Stabilized Cu+ species have been widely considered as catalytic active sites in composite copper catalysts for catalytic reactions with industrial importance. However, few examples comprehensively explicated the origin of stabilized Cu+ in a low-cost and widely investigated CuO/TiO2 system. In this study, mass producible CuO/TiO2 catalysts with interface-stabilized Cu+ were prepared, which showed excellent low-temperature CO oxidation activity. A thorough characterization and theoretical calculations proved that the strong charge-transfer effect and Ti-O-Cu hybridization in Ti-doped CuO(111) at the CuO/TiO2 interface contributed to the formation and stabilization of Cu+ species. The CO molecule adsorbed on Cu+ and reacted directly with Ti doping-promoted active lattice oxygen via a Mars-van Krevelen mechanism, leading to the enhanced low-temperature activity.
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Affiliation(s)
- Yarong Fang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Xiao Chi
- Singapore Synchrotron Light Source National University of Singapore , 5 Research Link , 117603 , Singapore
| | - Li Li
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Ji Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Shoujie Liu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Xingxu Lu
- Department of Chemical, Materials and Biomolecular Engineering, Institute of Materials Science , University of Connecticut , Storrs , Connecticut 06269-3136 , United States
| | - Wen Xiao
- Department of Materials Science and Engineering , National University of Singapore , 117575 , Singapore
| | - Liming Wang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, Institute of High Energy Physics Department of Materials Science and Engineering , Chinese Academy of Sciences , Beijing 100049 , China
| | - Zhu Luo
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Weiwei Yang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Siyu Hu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Juxia Xiong
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Son Hoang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Hongtao Deng
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Fudong Liu
- Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center , University of Central Florida , Orlando , Florida 32816 , United States
| | - Lizhi Zhang
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
| | - Puxian Gao
- Department of Chemical, Materials and Biomolecular Engineering, Institute of Materials Science , University of Connecticut , Storrs , Connecticut 06269-3136 , United States
| | - Jun Ding
- Department of Materials Science and Engineering , National University of Singapore , 117575 , Singapore
| | - Yanbing Guo
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Institute of Environmental and Applied Chemistry, College of Chemistry , Central China Normal University , Wuhan 430079 , P. R. China
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Guo Y, Xue Y, Li X, Li C, Song H, Niu Y, Liu H, Mai X, Zhang J, Guo Z. Effects of Transition Metal Substituents on Interfacial and Electronic Structure of CH 3NH 3PbI 3/TiO 2 Interface: A First-Principles Comparative Study. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E966. [PMID: 31266249 PMCID: PMC6669479 DOI: 10.3390/nano9070966] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 06/28/2019] [Indexed: 01/25/2023]
Abstract
To evaluate the influence of transition metal substituents on the characteristics of CH3NH3PbI3/TiO2, we investigated the geometrical and electronic properties of transition metal-substituted CH3NH3PbI3/TiO2 by first-principles calculations. The results suggested that the substitution of Ti4+ at the five-fold coordinated (Ti5c) sites by transition metals is energetically favored. The substituted interface has enhanced visible light sensitivity and photoelectrocatalytic activity by reducing the transition energies. The transition metal substitution can effectively tune the band gap of the interface, which significantly improves the photo-reactivity. The substituted systems are expected to be more efficient in separating the photo-generated electrons-holes and active in the visible spectrum.
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Affiliation(s)
- Yao Guo
- Department of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, Henan 455000, China.
- Department of Mathematics and Physics, Anyang Institute of Technology, Anyang, Henan 455000, China.
| | - Yuanbin Xue
- Department of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, Henan 455000, China
| | - Xianchang Li
- Department of Mathematics and Physics, Anyang Institute of Technology, Anyang, Henan 455000, China
| | - Chengbo Li
- Department of Mathematics and Physics, Anyang Institute of Technology, Anyang, Henan 455000, China
| | - Haixiang Song
- Department of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, Henan 455000, China
| | - Yongsheng Niu
- Department of Chemical and Environmental Engineering, Anyang Institute of Technology, Anyang, Henan 455000, China.
| | - Hu Liu
- Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA
- Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education;National Engineering Research Center for Advanced Polymer Processing Technology, ZhengzhouUniversity, Zhengzhou, Henan 450002, China
| | - Xianmin Mai
- School of Urban Planning and Architecture, Southwest Minzu University, Chengdu, Sichuan 610041, China
| | - Jiaoxia Zhang
- School of Material Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu 212003, China
| | - Zhanhu Guo
- Integrated Composites Laboratory (ICL), Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996, USA.
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Katal R, Kholghi Eshkalak S, Masudy-Panah S, Kosari M, Saeedikhani M, Zarinejad M, Ramakrishna S. Evaluation of Solar-Driven Photocatalytic Activity of Thermal Treated TiO₂ under Various Atmospheres. NANOMATERIALS 2019; 9:nano9020163. [PMID: 30699943 PMCID: PMC6409930 DOI: 10.3390/nano9020163] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/23/2019] [Accepted: 01/25/2019] [Indexed: 12/02/2022]
Abstract
In this report, the photocatalytic activity of P25 has been explored and the influence of thermal treatment under various atmospheres (air, vacuum and hydrogen) were discussed. The samples’ characteristics were disclosed by means of various instruments including X-ray diffraction (XRD), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and UV–vis. This study also accentuates various states of the oxygen vacancy density formed inside the samples as well as the colour turning observed in treated P25 under various atmospheres. Produced coloured TiO2 samples were then exploited for their photocatalytic capability concerning photodegradation of methylene blue (MB) using air mass (AM) 1.5 G solar light irradiation. Our findings revealed that exceptional photocatalytic activity of P25 is related to the thermal treatment. Neither oxygen vacancy formation nor photocatalytic activity enhancement was observed in the air-treated sample. H2-treated samples have shown better photoactivity which even could be further improved by optimizing treatment conditions to achieve the advantages of the positive role of oxygen vacancy (O-vacancy at higher concentration than optimum acts as electron trapping sites). The chemical structure and stability of the samples were also studied. There was no sign of deteriorating of O2-vacancies inside the samples after 6 months. High stability of thermal treated samples in terms of both long and short-term time intervals is another significant feature of the produced photocatalyst.
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Affiliation(s)
- Reza Katal
- Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore.
| | - Saeideh Kholghi Eshkalak
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117575, Singapore.
| | - Saeid Masudy-Panah
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 119260, Singapore.
| | - Mohammadreza Kosari
- Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Singapore 119260, Singapore.
| | - Mohsen Saeedikhani
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117583, Singapore.
| | - Mehrdad Zarinejad
- Singapore Institute of Manufacturing Technology (SIMTech), A*STAR (Agency for Science, Technology and Research), Singapore 138634, Singapore.
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117575, Singapore.
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Kashale AA, Dwivedi PK, Sathe BR, Shelke MV, Chang JY, Ghule AV. Biomass-Mediated Synthesis of Cu-Doped TiO 2 Nanoparticles for Improved-Performance Lithium-Ion Batteries. ACS OMEGA 2018; 3:13676-13684. [PMID: 30411047 PMCID: PMC6217651 DOI: 10.1021/acsomega.8b01903] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Accepted: 10/09/2018] [Indexed: 06/08/2023]
Abstract
Pure TiO2 and Cu-doped TiO2 nanoparticles are synthesized by the biomediated green approach using the Bengal gram bean extract. The extract containing biomolecules acts as capping agent, which helps to control the size of nanoparticles and inhibit the agglomeration of particles. Copper is doped in TiO2 to enhance the electronic conductivity of TiO2 and its electrochemical performance. The Cu-doped TiO2 nanoparticle-based anode shows high specific capacitance, good cycling stability, and rate capability performance for its envisaged application in lithium-ion battery. Among pure TiO2, 3% Cu-doped TiO2, and 7% Cu-doped TiO2 anode, the latter shows the highest capacity of 250 mAh g-1 (97.6% capacity retention) after 100 cycles and more than 99% of coulombic efficiency at 0.5 A g-1 current density. The improved electrochemical performance in the 7% Cu-doped TiO2 is attributed to the synergetic effect between copper and titania. The results reveal that Cu-doped TiO2 nanoparticles might be contributing to the enhanced electronic conductivity, providing an efficient pathway for fast electron transfer.
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Affiliation(s)
- Anil A. Kashale
- Department
of Nanotechnology and Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
- Department of Chemistry, Shivaji University, Kolhapur 416004, Maharashtra, India
| | - Pravin K. Dwivedi
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory (CSIR-NCL), Pune 411008, Maharashtra, India
| | - Bhaskar R. Sathe
- Department
of Nanotechnology and Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
| | - Manjusha V. Shelke
- Physical
and Materials Chemistry Division, CSIR-National
Chemical Laboratory (CSIR-NCL), Pune 411008, Maharashtra, India
| | - Jia-Yaw Chang
- Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan
| | - Anil V. Ghule
- Department
of Nanotechnology and Department of Chemistry, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad 431004, Maharashtra, India
- Department of Chemistry, Shivaji University, Kolhapur 416004, Maharashtra, India
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Cu-Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app8112067] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Surface contamination by microbes is a major public health concern. A damp environment is one of potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO2) can effectively curb this growing threat. Metal-doped titania in anatase phase has been proven as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu)-doped TiO2 (Cu-TiO2) was evaluated against Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO2 was carried out via sol-gel technique. Cu-TiO2 further calcined at various temperatures (in the range of 500–700 °C) to evaluate the thermal stability of TiO2 anatase phase. The physico-chemical properties of the samples were characterized through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV–visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO2 was maintained well, up to 650 °C, by the Cu dopant. UV–vis results suggested that the visible light absorption property of Cu-TiO2 was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasize the introduction of Cu+ and Cu2+ ions by replacing Ti4+ ions in the TiO2 lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9999%) was attained in 30 min of visible light irradiation by Cu-TiO2.
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Reyes-Pérez F, Gallardo JJ, Aguilar T, Alcántara R, Fernández-Lorenzo C, Navas J. Visible-Light-Enhanced Photocatalytic Activity of Totally Inorganic Halide-Based Perovskite. ChemistrySelect 2018. [DOI: 10.1002/slct.201801564] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fran Reyes-Pérez
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
| | - Juan Jesús Gallardo
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
| | - Teresa Aguilar
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
| | - Rodrigo Alcántara
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
| | - Concha Fernández-Lorenzo
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
| | - Javier Navas
- Departamento de Química Física; Facultad de Ciencias; Universidad de Cádiz; E-11510 Puerto Real (Cádiz) Spain
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31
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Sankova N, Semeykina V, Selishchev D, Glazneva T, Parkhomchuk E, Larichev Y, Uvarov N. Influence of Tetraalkylammonium Compounds on Photocatalytic and Physical Properties of TiO2. Catal Letters 2018. [DOI: 10.1007/s10562-018-2455-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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32
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Saha M, Ghosh S, Paul S, Dalal B, De SK. Nb‐Dopant‐Induced Tuning of Optical and Electrical Property of Anatase TiO
2
Nanocrystals. ChemistrySelect 2018. [DOI: 10.1002/slct.201800434] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Manas Saha
- Department of Materials ScienceIndian Association for the Cultivation of Science 2 A & 2B Raja S C Mullick Road, Jadavpur Kolkata – 700032 INDIA
| | - Sirshendu Ghosh
- Department of Materials ScienceIndian Association for the Cultivation of Science 2 A & 2B Raja S C Mullick Road, Jadavpur Kolkata – 700032 INDIA
| | - Sumana Paul
- Department of Materials ScienceIndian Association for the Cultivation of Science 2 A & 2B Raja S C Mullick Road, Jadavpur Kolkata – 700032 INDIA
| | - Biswajit Dalal
- Department of Materials ScienceIndian Association for the Cultivation of Science 2 A & 2B Raja S C Mullick Road, Jadavpur Kolkata – 700032 INDIA
| | - Subodh K. De
- Department of Materials ScienceIndian Association for the Cultivation of Science 2 A & 2B Raja S C Mullick Road, Jadavpur Kolkata – 700032 INDIA
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Aruna devi R, Kavitha B, Rajarajan M, Suganthi A. An eco-friendly highly stable and efficient Ni-C-S codoped wurtzite ZnO nanoplate: a smart photocatalyst for the quick removal of food dye under solar light irradiation. SEP SCI TECHNOL 2018. [DOI: 10.1080/01496395.2018.1447582] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- R Aruna devi
- P.G. & Research Department of Chemistry, C.P.A. College, Bodinayakanur, Tamil Nadu, India
| | - B Kavitha
- P.G. & Research Department of Chemistry, C.P.A. College, Bodinayakanur, Tamil Nadu, India
| | - M Rajarajan
- Directorate of Distance Education, Madurai Kamaraj University, Madurai, Tamilnadu, India
| | - A Suganthi
- Mother Teresa Women’s University, Kodaikanal, Tamilnadu, India
- PG & Research Department of Chemistry, Thiagarajar College, Madurai, Tamil Nadu, India
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Hasan MM, Allam NK. Unbiased spontaneous solar hydrogen production using stable TiO2–CuO composite nanofiber photocatalysts. RSC Adv 2018; 8:37219-37228. [PMID: 35557814 PMCID: PMC9089283 DOI: 10.1039/c8ra06763e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 10/29/2018] [Indexed: 12/01/2022] Open
Abstract
We report on the optimization of electrospun TiO2–CuO composite nanofibers as low-cost and stable photocatalysts for visible-light photocatalytic water splitting. The effect of different annealing atmospheres on the crystal structure of the fabricated nanofibers was investigated and correlated to the photocatalytic activity of the material. The presence of CuO resulted in narrowing the bandgap of TiO2 and shifting the absorption edge into the visible region of the light spectrum. The effect of incorporating CuO within TiO2 nanofibers on the crystal structure and composition was also investigated using X-ray diffraction (XRD), electron paramagnetic resonance (EPR), and X-ray photoelectron spectroscopy (XPS) techniques. The fabricated TiO2–CuO composite nanofibers showed 117% enhancement in the amount of hydrogen evolved during the photocatalytic water splitting process compared to pure TiO2. This enhancement was related to the created shallow defect states that facilitate charge transfer from TiO2 to CuO and distinct characteristics of the composite nanofibers, such as the high surface area and directional charge transfer. The study showed that Cu is a promising alternative to noble metals as a catalyst in photocatalytic water splitting, with the advantage of being an Earth abundant element and a relatively cheap material. We report on the optimization of electrospun TiO2–CuO composite nanofibers as low-cost and stable photocatalysts for visible-light photocatalytic water splitting.![]()
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Affiliation(s)
- Menna M. Hasan
- Energy Materials Laboratory
- School of Sciences and Engineering
- The American University in Cairo
- 11835 New Cairo
- Egypt
| | - Nageh K. Allam
- Energy Materials Laboratory
- School of Sciences and Engineering
- The American University in Cairo
- 11835 New Cairo
- Egypt
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35
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Chaudhary D, Singh S, Vankar V, Khare N. ZnO nanoparticles decorated multi-walled carbon nanotubes for enhanced photocatalytic and photoelectrochemical water splitting. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2017.10.018] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Abstract
Abstract
This study presents the incorporation of Al and Ni cations onto the surface of TiO2 nanoparticles used as photoelectrode in dye sensitized solar cells (DSSCs). The incorporation of these cations was performed using the chemical bath deposition (CBD) technique. This process was applied up to three times to evaluate the semiconductors’ properties with respect to the amount of Al and Ni. The M(Al,Ni)-TiO2-based semiconductors were widely characterized using techniques such as X-ray fluorescence, X-ray diffraction, Raman spectroscopy, UV-Vis spectroscopy and X-ray photoelectron spectroscopy. The presence of (hydr)oxide species of Al(III) and Ni(II) was confirmed and anatase was the predominant crystalline phase obtained. Moreover, for both elements, a decrease in the band gap energy was observed, this being more pronounced after the incorporation of Ni. Furthermore, the use of the M(Al,Ni)-TiO2-based semiconductors as photoelectrodes in DSSCs led to an increase in the open-circuit voltage of up to 22% and 10% for the incorporation of Al and Ni, respectively. This increase can be reasonably explained by the negative shift of the flat band potential of the photoelectrodes. EIS measurements were performed to study the electron transport kinetics in the photoelectrode and the internal resistance in the DSSCs to understand the photocurrent density values obtained.
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37
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Fan J, Menéndez E, Guerrero M, Quintana A, Weschke E, Pellicer E, Sort J. Unraveling the Origin of Magnetism in Mesoporous Cu-Doped SnO₂ Magnetic Semiconductors. NANOMATERIALS 2017; 7:nano7110348. [PMID: 29068367 PMCID: PMC5707565 DOI: 10.3390/nano7110348] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Revised: 10/11/2017] [Accepted: 10/20/2017] [Indexed: 11/22/2022]
Abstract
The origin of magnetism in wide-gap semiconductors doped with non-ferromagnetic 3d transition metals still remains intriguing. In this article, insights in the magnetic properties of ordered mesoporous Cu-doped SnO2 powders, prepared by hard-templating, have been unraveled. Whereas, both oxygen vacancies and Fe-based impurity phases could be a plausible explanation for the observed room temperature ferromagnetism, the low temperature magnetism is mainly and unambiguously arising from the nanoscale nature of the formed antiferromagnetic CuO, which results in a net magnetization that is reminiscent of ferromagnetic behavior. This is ascribed to uncompensated spins and shape-mediated spin canting effects. The reduced blocking temperature, which resides between 30 and 5 K, and traces of vertical shifts in the hysteresis loops confirm size effects in CuO. The mesoporous nature of the system with a large surface-to-volume ratio likely promotes the occurrence of uncompensated spins, spin canting, and spin frustration, offering new prospects in the use of magnetic semiconductors for energy-efficient spintronics.
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Affiliation(s)
- Junpeng Fan
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
| | - Enric Menéndez
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
| | - Miguel Guerrero
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
| | - Alberto Quintana
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
| | - Eugen Weschke
- Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, 12489 Berlin, Germany.
| | - Eva Pellicer
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
| | - Jordi Sort
- Departament de Física, UniversitatAutònoma de Barcelona, E-08193 Cerdanyola del Vallès, Spain.
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Pg. Lluís Companys 23, 08010 Barcelona, Spain.
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38
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Arora P, Fermah A, Rajput JK, Singh H, Badhan J. Efficient solar light-driven degradation of Congo red with novel Cu-loaded Fe 3O 4@TiO 2 nanoparticles. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:19546-19560. [PMID: 28681294 DOI: 10.1007/s11356-017-9571-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Accepted: 06/15/2017] [Indexed: 06/07/2023]
Abstract
In this work, Cu-loaded Fe3O4@TiO2 core shell nanoparticles were prepared in a single pot by coating of TiO2 on Fe3O4 nanoparticles followed by Cu loading. X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), thermogravimetric analysis (TGA), Brunauer-Emmett- Teller (BET), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), and valence band X-ray photoelectron spectroscopy (VB XPS) techniques were used for characterization of as prepared nanoparticles. Synergism between copper and titania was evaluated by studying the solar light-driven photodegradation of Congo red dye solution in the presence of Fe3O4@TiO2 nanoparticles on one side and Cu-loaded Fe3O4@TiO2 nanoparticles on the other side. The latter performed better than the former catalyst, indicating the enhanced activity of copper-loaded catalyst. Further photodegradation was studied by three means, i.e., under ultraviolet (UV), refluxing, and solar radiations. Cu-loaded Fe3O4@TiO2 enhanced the degradation efficiency of Congo red dye. Thus, Cu act possibly by reducing the band gap of TiO2 and widening the optical response of semiconductor, as a result of which solar light could be used to carry out photocatalysis. Graphical abstract Photodegradation of congo red over Cu-loaded Fe3O4@TiO2 nanoparticles.
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Affiliation(s)
- Priya Arora
- Department of Chemistry, Dr. B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India.
| | - Alisha Fermah
- Department of Chemistry, Dr. B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India
| | - Jaspreet Kaur Rajput
- Department of Chemistry, Dr. B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India
| | - Harminder Singh
- Department of Chemistry, Dr. B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India
| | - Jigyasa Badhan
- Department of Chemistry, Dr. B R Ambedkar National Institute of Technology, Jalandhar, Punjab, 144011, India
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40
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de Los Santos DM, Chahid S, Alcántara R, Navas J, Aguilar T, Gallardo JJ, Gómez-Villarejo R, Carrillo-Berdugo I, Fernández-Lorenzo C. MoS 2/Cu/TiO 2 nanoparticles: synthesis, characterization and effect on photocatalytic decomposition of methylene blue in water under visible light. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 2017:184-193. [PMID: 29698233 DOI: 10.2166/wst.2018.101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photodegradation processes are of great interest in a range of applications, one of which is the photodecomposition of pollutants. For this reason, analysing nanoparticles that improve the efficiency of these processes under solar radiation are very necessary. Thus, in this study, TiO2 was doped with Mo and Cu using low-temperature hydrolysis as the method of synthesis. Pure TiO2 and x%MoS2/Cu/TiO2 nanoparticles were prepared, where x is the theoretical quantity of MoS2 added (0.0%, 1.0%, 5.5%, 10.0%), setting the nominal quantity of Cu at 0.5 wt.%. The samples obtained were characterized by X-ray diffraction, Raman spectroscopy, X-ray electron spectroscopy and UV-Vis spectroscopy in diffuse reflectance mode. The results suggest that the TiO2 structure was doped with the Mo6+ and Cu2+ ions in the position of the Ti4+. The x%MoS2/Cu/TiO2 samples presented lower band gap energy values and greater optical absorption in the visible region than the pure TiO2 sample. Lastly, the photocatalytic activity of the samples was assessed by means of the photodegradation of methylene blue under visible light. The results show that when the quantity of Mo in the co-doped samples increased (x%MoS2/Cu/TiO2) there were significant increases of up to 93% in the photocatalytic activity.
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Affiliation(s)
- Desireé M de Los Santos
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Sara Chahid
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Rodrigo Alcántara
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Javier Navas
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Teresa Aguilar
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Juan Jesús Gallardo
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Roberto Gómez-Villarejo
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Iván Carrillo-Berdugo
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
| | - Concha Fernández-Lorenzo
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain E-mail:
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41
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Xu Y, Gong Y, Ren H, Liu W, Niu L, Li C, Liu X. In situ structural modification of graphitic carbon nitride by alkali halides and influence on photocatalytic activity. RSC Adv 2017. [DOI: 10.1039/c7ra05555b] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Introducing alkali halides during thermal condensation of melamine disturbs periodic ordering in the basal plane, reduces the band gap, and facilitates charge carrier transfer and separation, and thus enhances the photocatalytic performance of g-C3N4.
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Affiliation(s)
- Yan Xu
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Yinyan Gong
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Hui Ren
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Wenbo Liu
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Lengyuan Niu
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Can Li
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
| | - Xinjuan Liu
- Center for Coordination Bond Metrology and Engineering
- College of Materials Science and Engineering
- China Jiliang University
- Hangzhou
- China
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42
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Photocatalytic Reduction of CO2 with Water into Methanol and Ethanol Using Graphene Derivative–TiO2 Composites: Effect of pH and Copper(I) Oxide. Top Catal 2016. [DOI: 10.1007/s11244-016-0655-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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43
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Zhang Y, Meng Y, Zhu K, Qiu H, Ju Y, Gao Y, Du F, Zou B, Chen G, Wei Y. Copper-Doped Titanium Dioxide Bronze Nanowires with Superior High Rate Capability for Lithium Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2016; 8:7957-7965. [PMID: 26963224 DOI: 10.1021/acsami.5b10766] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Pristine and Cu-doped TiO2-B nanowires are synthesized by the microwave assisted hydrothermal method. The doped oxide exhibits a highly porous structure with a specific surface area of 160.7 m(2) g(-1). As evidenced by X-ray photoelectron spectroscopy and X-ray energy dispersive spectroscopy, around 2.0 atom % Cu(2+) cations are introduced into TiO2-B, which leads to not only a slightly expanded lattice network but also, more importantly, a modified electronic structure. The band gap of TiO2-B is reduced from 2.94 to 2.55 eV, resulting in enhanced electronic conductivity. Cyclic voltammetry and electrochemical impedance spectroscopy reveal improved electrochemical kinetic properties of TiO2-B due to the Cu doping. The doped nanowires show a specific capacity of 186.8 mAh g(-1) at the 10 C rate with a capacity retention of 64.3% after 2000 cycles. Remarkably, our material exhibits a specific capacity of 150 mAh g(-1) at the 60 C rate, substantiating its superior high rate capability for rechargeable lithium batteries.
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Affiliation(s)
- Yongquan Zhang
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
- College of Applied Science, Harbin University of Science and Technology , Harbin 150080, P. R. China
| | - Yuan Meng
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Kai Zhu
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Hailong Qiu
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Yanming Ju
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Yu Gao
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Fei Du
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
| | - Bo Zou
- State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, P. R. China
| | - Gang Chen
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
- State Key Laboratory of Superhard Materials, Jilin University , Changchun 130012, P. R. China
| | - Yingjin Wei
- Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University , Changchun 130012, P. R. China
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44
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Gallardo JJ, Navas J, Zorrilla D, Alcántara R, Valor D, Sánchez-Coronilla A, Hernández NC, Fernández-Lorenzo C, Martín-Calleja J. A Study of Overheating of Thermostatically Controlled TiO 2Thin Films by Using Raman Spectroscopy. Chemphyschem 2015; 16:3949-58. [DOI: 10.1002/cphc.201500933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Juan Jesús Gallardo
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | - Javier Navas
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | - David Zorrilla
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | - Rodrigo Alcántara
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | - Diego Valor
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | | | - Norge Cruz Hernández
- Departamento de Física Aplicada I; Escuela Técnica Superior de Ingeniería Informática, av. Reina Mercedes; Universidad de Sevilla; 41012 Sevilla Spain
| | - Concha Fernández-Lorenzo
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
| | - Joaquín Martín-Calleja
- Departamento de Química Física, Facultad de Ciencias; Universidad de Cádiz; 11510 Puerto Real, Cádiz Spain
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45
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Navas J, Sánchez-Coronilla A, Gallardo JJ, Martín EI, Hernández NC, Alcántara R, Fernández-Lorenzo C, Martín-Calleja J. Revealing the role of Pb2+ in the stability of organic–inorganic hybrid perovskite CH3NH3Pb1−xCdxI3: an experimental and theoretical study. Phys Chem Chem Phys 2015; 17:23886-96. [DOI: 10.1039/c5cp04009d] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experimental and theoretical analysis revealing the role of Pb2+ in the stability of organic–inorganic hybrid perovskites.
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Affiliation(s)
- Javier Navas
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- Cádiz
- Spain
| | | | - Juan Jesús Gallardo
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- Cádiz
- Spain
| | - Elisa I. Martín
- Departamento de Ingeniería Química
- Facultad de Química
- Universidad de Sevilla
- E-41012 Sevilla
- Spain
| | - Norge C. Hernández
- Departamento de Física Aplicada I
- Escuela Técnica Superior de Ingeniería Informática
- Universidad de Sevilla
- E-41012 Sevilla
- Spain
| | - Rodrigo Alcántara
- Departamento de Química Física
- Facultad de Ciencias
- Universidad de Cádiz
- Cádiz
- Spain
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46
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Spadavecchia F, Ceotto M, Presti LL, Aieta C, Biraghi I, Meroni D, Ardizzone S, Cappelletti G. Second Generation Nitrogen Doped Titania Nanoparticles: A Comprehensive Electronic and Microstructural Picture. CHINESE J CHEM 2014. [DOI: 10.1002/cjoc.201400502] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Navas J, Sánchez-Coronilla A, Aguilar T, De los Santos DM, Hernández NC, Alcántara R, Fernández-Lorenzo C, Martín-Calleja J. Thermo-selective Tm(x)Ti(1-x)O(2-x/2) nanoparticles: from Tm-doped anatase TiO2 to a rutile/pyrochlore Tm2Ti2O7 mixture. An experimental and theoretical study with a photocatalytic application. NANOSCALE 2014; 6:12740-12757. [PMID: 25219888 DOI: 10.1039/c4nr03715d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
This is an experimental and theoretical study of thulium doped TiO2 nanoparticles. From an experimental perspective, a method was used to synthesize thulium-doped TiO2 nanoparticles in which Tm(3+) replaces Ti(4+) in the lattice, which to our knowledge has neither been reported nor studied theoretically so far. Different proportions of anatase and rutile phases were obtained at different annealing temperatures, and XRD and Raman spectroscopy also revealed the presence of a pyrochlore phase (Tm2Ti2O7) at 1173 K. Thus, the structure of the Tm-doped nanoparticles was thermally-controlled. Furthermore, XPS showed the presence of Tm(3+) in the samples synthesized, which produces oxygen vacancies to maintain the local neutrality in the lattice. The presence of Tm(3+) in the samples led to changes in the UV-Vis absorption spectra, so they showed photoluminescence properties and new states in the band gap, which produce a new lower energy electronic transition than the main TiO2 one. Periodic DFT calculations were performed to understand the experimentally produced structures. The production of oxygen vacancies was analysed and the changes generated in the structure were fully detailed. The DOS and PDOS analyses confirmed the experimental results obtained using UV-Vis spectroscopy, and showed that the new electronic states in the band gap are due to interactions of the f state of Tm and the p state of O. Likewise, the charge study and the ELF analysis indicate that when Tm is introduced into the TiO2 structure, the Ti-O bond around the oxygen vacancy is strengthened. Finally, an example of a photocatalytic application was developed to show the high efficiency of the samples due to the heterojunction in the interfaces of the phases in the samples, which improved the charge separation and the good charge carrier mobility due to the presence of the pyrochlore phase, as was also shown theoretically.
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Affiliation(s)
- Javier Navas
- Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, E-11510 Puerto Real (Cádiz), Spain.
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48
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Valero JM, Obregón S, Colón G. Active Site Considerations on the Photocatalytic H2 Evolution Performance of Cu-Doped TiO2 Obtained by Different Doping Methods. ACS Catal 2014. [DOI: 10.1021/cs500865y] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Juan M. Valero
- Instituto de Ciencia de Materiales
de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Américo
Vespucio s/n, 41092 Sevilla, Spain
| | - Sergio Obregón
- Instituto de Ciencia de Materiales
de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Américo
Vespucio s/n, 41092 Sevilla, Spain
| | - Gerardo Colón
- Instituto de Ciencia de Materiales
de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Américo
Vespucio s/n, 41092 Sevilla, Spain
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