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Bakardjieva S, Mares J, Koci E, Tolasz J, Fajgar R, Ryukhtin V, Klementova M, Michna Š, Bibova H, Holmestad R, Titorenkova R, Caplovicova M. Effect of Multiply Twinned Ag (0) Nanoparticles on Photocatalytic Properties of TiO 2 Nanosheets and TiO 2 Nanostructured Thin Films. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:750. [PMID: 35269238 PMCID: PMC8911912 DOI: 10.3390/nano12050750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/10/2022] [Accepted: 02/17/2022] [Indexed: 11/17/2022]
Abstract
Ag-decorated TiO2 nanostructured materials are promising photocatalysts. We used non-standard cryo-lyophilization and ArF laser ablation methods to produce TiO2 nanosheets and TiO2 nanostructured thin films decorated with Ag nanoparticles. Both methods have a common advantage in that they provide a single multiply twinned Ag(0) characterized by {111} twin boundaries. Advanced microscopy techniques and electron diffraction patterns revealed the formation of multiply twinned Ag(0) structures at elevated temperatures (500 °C and 800 °C). The photocatalytic activity was demonstrated by the efficient degradation of 4-chlorophenol and Total Organic Carbon removal using Ag-TiO2 nanosheets, because the multiply twinned Ag(0) served as an immobilized photocatalytically active center. Ag-TiO2 nanostructured thin films decorated with multiply twinned Ag(0) achieved improved photoelectrochemical water splitting due to the additional induction of a plasmonic effect. The photocatalytic properties of TiO2 nanosheets and TiO2 nanostructured thin films were correlated with the presence of defect-twinned structures formed from Ag(0) nanoparticles with a narrow size distribution, tuned to between 10 and 20 nm. This work opens up new possibilities for understanding the defects generated in Ag-TiO2 nanostructured materials and paves the way for connecting their morphology with their photocatalytic activity.
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Affiliation(s)
- Snejana Bakardjieva
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-Rez, Czech Republic; (J.M.); (E.K.); (J.T.)
- Faculty of Mechanical Engineering, JE Purkyně University, Pasteurova 1, 400 96 Ústí nad Labem, Czech Republic;
| | - Jakub Mares
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-Rez, Czech Republic; (J.M.); (E.K.); (J.T.)
- Faculty of Mechanical Engineering, JE Purkyně University, Pasteurova 1, 400 96 Ústí nad Labem, Czech Republic;
| | - Eva Koci
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-Rez, Czech Republic; (J.M.); (E.K.); (J.T.)
| | - Jakub Tolasz
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, 250 68 Husinec-Rez, Czech Republic; (J.M.); (E.K.); (J.T.)
| | - Radek Fajgar
- Institute of Chemical Process and Fundamentals of the Czech Academy of Sciences, Rozvojova 2/135, 165 02 Prague, Czech Republic;
| | - Vasyl Ryukhtin
- Nuclear Physics Institute of Czech Academy of Sciences, 250 68 Husinec-Rez, Czech Republic;
| | - Mariana Klementova
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic;
| | - Štefan Michna
- Faculty of Mechanical Engineering, JE Purkyně University, Pasteurova 1, 400 96 Ústí nad Labem, Czech Republic;
| | - Hana Bibova
- J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, Dolejskova 2155/3, 182 23 Prague, Czech Republic;
| | - Randi Holmestad
- Department of Physics, Norwegian University of Science and Technology (NTNU), NO 7491 Trondheim, Norway;
| | - Rositsa Titorenkova
- Institute of mineralogy and crystallography, Bulgarian Academy of Sciences, 107, Acad. G. Bonchev Str., 1113 Sofia, Bulgaria;
| | - Maria Caplovicova
- STU Centre for Nanodiagnostics, University Science Park Bratislava Centre, Slovak University of Technology, Vazovova 5, 811 07 Bratislava, Slovakia;
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Zhou Y, Feng S, Yuan X, Shao C, Zheng W, Wu W, Duan C, Zeng S. Nitrogen–fluorine-codoped TiO2/Zn based MOF binary composites for efficient removal of bisphenol A under visible light. Aust J Chem 2022. [DOI: 10.1071/ch21188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Mafa PJ, Mamba BB, Kuvarega AT. Construction of hierarchical BiPW12O40/BiOI p–n heterojunction with enhanced visible light activity for degradation of endocrine disrupting Bisphenol A. Sep Purif Technol 2020. [DOI: 10.1016/j.seppur.2020.117349] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bakardjieva S, Mares J, Fajgar R, Zenou VY, Maleckova M, Chatzisymeon E, Bibova H, Jirkovsky J. The relationship between microstructure and photocatalytic behavior in lanthanum-modified 2D TiO 2 nanosheets upon annealing of a freeze-cast precursor. RSC Adv 2019; 9:22988-23003. [PMID: 35514506 PMCID: PMC9067125 DOI: 10.1039/c9ra03940f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 07/13/2019] [Indexed: 11/21/2022] Open
Abstract
Titanium dioxide modified with 3 wt% La was prepared via a green freeze-casting method, and its photocatalytic activity was tested in terms of its ability to degrade 4-chlorophenol (4-CP) and remove total organic carbon (TOC). Under annealing conditions, the freeze-cast precursor was transformed into an La-modified anatase with a well-defined 2D TiO2 nanosheet morphology. Rietveld refinement of the X-ray diffraction patterns confirmed the substitutional nature of the La cation that induced local structural variations and involved subtle ion displacement in the TiO2 lattice due to the ionic size effect. Despite nearly identical tetragonal structures, replacement of Ti with La alters the photocatalytic activity through a reduction in band gap energies and an increase in charge carrier mobility. Material annealed at 650 °C exhibited the highest photocatalytic performance and achieved efficient TOC removal. Upon annealing at 800 °C, nanoscale lanthanum-enriched regions were generated due to the diffusive migration of La cations and phase transition from anatase to rutile. The La3+ cation, acting as a structural promoter, supported 2D TiO2 growth with well controlled crystallite size, surface area and porosity. La3+ could be regarded as a potential electronic promoter that can reduce the band gap of 2D TiO2 nanosheets and can provide a signature of the electron transfer and carrier charge separation. Both methods, kinetics of degradation of 4-CP and TOC, provided similar results, revealing that the photocatalytic activity under UV light irradiation increased in the order 950C < 500 °C < 800 °C < 650 °C < TiO2-P25.
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Affiliation(s)
- Snejana Bakardjieva
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68 Husinec-Řež Czech Republic
| | - Jakub Mares
- Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68 Husinec-Řež Czech Republic
| | - Radek Fajgar
- Institute of Chemical Process and Fundamentals of the Czech Academy of Sciences Rozvojova 2/135 165 02 Prague Czech Republic
| | - Victor Y Zenou
- Nuclear Research Center-Negev, Department of Material Engineering 841 90 Beer Sheva Israel
| | - Michaela Maleckova
- Charles University, Faculty of Science Hlavova 2030/8 128 42 Prague Czech Republic
| | - Efthalia Chatzisymeon
- School of Engineering, Institute for Infrastructure and Environment, The University of Edinburgh Edinburgh EH9 3JL UK
| | - Hana Bibova
- J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Dolejskova 2155/3 182 23 Prague Czech Republic
| | - Jaromir Jirkovsky
- J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences Dolejskova 2155/3 182 23 Prague Czech Republic
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