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Tinoco Navarro LK, Jaroslav C. Enhancing Photocatalytic Properties of TiO 2 Photocatalyst and Heterojunctions: A Comprehensive Review of the Impact of Biphasic Systems in Aerogels and Xerogels Synthesis, Methods, and Mechanisms for Environmental Applications. Gels 2023; 9:976. [PMID: 38131962 PMCID: PMC10742597 DOI: 10.3390/gels9120976] [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: 10/20/2023] [Revised: 11/30/2023] [Accepted: 12/03/2023] [Indexed: 12/23/2023] Open
Abstract
This review provides a detailed exploration of titanium dioxide (TiO2) photocatalysts, emphasizing structural phases, heterophase junctions, and their impact on efficiency. Key points include diverse synthesis methods, with a focus on the sol-gel route and variants like low-temperature hydrothermal synthesis (LTHT). The review delves into the influence of acid-base donors on gelation, dissects crucial drying techniques for TiO2 aerogel or xerogel catalysts, and meticulously examines mechanisms underlying photocatalytic activity. It highlights the role of physicochemical properties in charge diffusion, carrier recombination, and the impact of scavengers in photo-oxidation/reduction. Additionally, TiO2 doping techniques and heterostructures and their potential for enhancing efficiency are briefly discussed, all within the context of environmental applications.
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Affiliation(s)
- Lizeth Katherine Tinoco Navarro
- CEITEC-Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 612 00 Brno, Czech Republic;
| | - Cihlar Jaroslav
- CEITEC-Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, 612 00 Brno, Czech Republic;
- Institute of Materials Science and Engineering, Brno University of Technology, Technicka 2, 616 69 Brno, Czech Republic
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2
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Arkas M, Giannakopoulos K, Favvas EP, Papageorgiou S, Theodorakopoulos GV, Giannoulatou A, Vardavoulias M, Giannakoudakis DA, Triantafyllidis KS, Georgiou E, Pashalidis I. Comparative Study of the U(VI) Adsorption by Hybrid Silica-Hyperbranched Poly(ethylene imine) Nanoparticles and Xerogels. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13111794. [PMID: 37299697 DOI: 10.3390/nano13111794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 05/26/2023] [Accepted: 05/29/2023] [Indexed: 06/12/2023]
Abstract
Two different silica conformations (xerogels and nanoparticles), both formed by the mediation of dendritic poly (ethylene imine), were tested at low pHs for problematic uranyl cation sorption. The effect of crucial factors, i.e., temperature, electrostatic forces, adsorbent composition, accessibility of the pollutant to the dendritic cavities, and MW of the organic matrix, was investigated to determine the optimum formulation for water purification under these conditions. This was attained with the aid of UV-visible and FTIR spectroscopy, dynamic light scattering (DLS), ζ-potential, liquid nitrogen (LN2) porosimetry, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Results highlighted that both adsorbents have extraordinary sorption capacities. Xerogels are cost-effective since they approximate the performance of nanoparticles with much less organic content. Both adsorbents could be used in the form of dispersions. The xerogels, though, are more practicable materials since they may penetrate the pores of a metal or ceramic solid substrate in the form of a precursor gel-forming solution, producing composite purification devices.
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Affiliation(s)
- Michael Arkas
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | - Konstantinos Giannakopoulos
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | - Evangelos P Favvas
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | - Sergios Papageorgiou
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | - George V Theodorakopoulos
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | - Artemis Giannoulatou
- National Centre for Scientific Research "Demokritos", Institute of Nanoscience and Nanotechnology, 15310 Athens, Greece
| | | | | | | | - Efthalia Georgiou
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
| | - Ioannis Pashalidis
- Department of Chemistry, University of Cyprus, P.O. Box 20537, 1678 Nicosia, Cyprus
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Bakare FF, Chou YJ, Huang YH, Tesfay AH, Moriga T, Shih SJ. Correlation of Morphology and In-Vitro Degradation Behavior of Spray Pyrolyzed Bioactive Glasses. MATERIALS 2019; 12:ma12223703. [PMID: 31717605 PMCID: PMC6888571 DOI: 10.3390/ma12223703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/04/2019] [Accepted: 11/04/2019] [Indexed: 01/12/2023]
Abstract
Bioactive glass (BG) is considered to be one of the most remarkable materials in the field of bone tissue regeneration due to its superior bioactivity. In this study, both un-treated and polyethylene glycols (PEG)-treated BG particles were prepared using a spray pyrolysis process to study the correlation between particle morphology and degradation behavior. The phase compositions, surface morphologies, inner structures, and specific surface areas of all BG specimens were examined by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen adsorption/desorption, respectively. Simulated body fluid (SBF) immersion evaluated the assessments of bioactivity and degradation behavior. The results demonstrate three particle morphologies of solid, porous, and hollow factors. The correlation between porosity, bioactivity, and degradation behavior was discussed.
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Affiliation(s)
- Fetene Fufa Bakare
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; (F.F.B.); (Y.-H.H.); (A.H.T.)
| | - Yu-Jen Chou
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan;
| | - Yu-Hsuan Huang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; (F.F.B.); (Y.-H.H.); (A.H.T.)
| | - Abadi Hadush Tesfay
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; (F.F.B.); (Y.-H.H.); (A.H.T.)
| | - Toshihiro Moriga
- Department of Chemical Science and Technology, Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minami-Josanjima, Tokushima 770-8506, Japan;
| | - Shao-Ju Shih
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan; (F.F.B.); (Y.-H.H.); (A.H.T.)
- Correspondence:
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Hong BJ, Hsiao CW, Bakare FF, Sun JT, Shih SJ. Effect of Acetic Acid Concentration on Pore Structure for Mesoporous Bioactive Glass during Spray Pyrolysis. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E963. [PMID: 29882821 PMCID: PMC6025285 DOI: 10.3390/ma11060963] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 05/25/2018] [Accepted: 06/03/2018] [Indexed: 11/25/2022]
Abstract
Mesoporous bioactive glass (MBG) is considered as one of the most important materials in the field of bone implants and drug carriers, owing to its superior bioactivity. In previous studies, tri-block surfactants (e.g., F127 and P123) were commonly used as pore-forming agents. However, the use of surfactants may cause serious problems such as micelle aggregation and carbon contamination and thus decrease bioactivity. Therefore, in this study, we demonstrated the synthesis of MBG using acetic acid (HAc) as a pore-forming agent to overcome the disadvantages caused by surfactants. Both untreated and HAc-treated BG powders were synthesized using spray pyrolysis and various characterizations were carried out. The results show that a mesoporous structure was successfully formed and the highest specific surface area of ~230 m²/g with improved bioactivity was reported.
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Affiliation(s)
- Bo-Jiang Hong
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Chih-Wei Hsiao
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Fufa Fetene Bakare
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Jung-Ting Sun
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
| | - Shao-Ju Shih
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan.
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Rebelo QHF, Ferreira CS, Santos PL, Bonacin JA, Passos RR, Pocrifka LA, Paula MMS. Synthesis and characterization of a nanocomposite NiO/SiO 2 from a sustainable source of SiO 2. PARTICULATE SCIENCE AND TECHNOLOGY 2018. [DOI: 10.1080/02726351.2018.1455781] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Querem H. F. Rebelo
- LEEN - Laboratory of Electrochemistry and Energy, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil
| | - Carlos S. Ferreira
- LEEN - Laboratory of Electrochemistry and Energy, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil
| | - Pamyla L. Santos
- LNANOMOL – Institute of Chemistry, University of Campinas – UNICAMP, Campinas, São Paulo, Brazil
| | - Juliano A. Bonacin
- LNANOMOL – Institute of Chemistry, University of Campinas – UNICAMP, Campinas, São Paulo, Brazil
| | - Raimundo R. Passos
- LEEN - Laboratory of Electrochemistry and Energy, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil
| | - Leandro A. Pocrifka
- LEEN - Laboratory of Electrochemistry and Energy, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil
| | - Marcos M. S. Paula
- LEEN - Laboratory of Electrochemistry and Energy, Department of Chemistry, Federal University of Amazonas, Manaus, Amazonas, Brazil
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Adsorption of acetaldehyde at room temperature in a continuous system using silica synthesized by the sol-gel method. KOREAN J CHEM ENG 2017. [DOI: 10.1007/s11814-017-0170-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hellstern HL, Mamakhel A, Bremholm M, Iversen BB. Core–shell nanoparticles by silica coating of metal oxides in a dual-stage hydrothermal flow reactor. Chem Commun (Camb) 2016; 52:3434-7. [DOI: 10.1039/c5cc09743f] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A green, fast, high-throughput, continuous-flow hydrothermal synthesis method is explored for preparation of silica coated nanoparticles with narrow size distribution.
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Affiliation(s)
- H. L. Hellstern
- Center for Materials Crystallography
- Department of Chemistry and iNANO
- Aarhus University
- Aarhus C
- Denmark
| | - A. Mamakhel
- Center for Materials Crystallography
- Department of Chemistry and iNANO
- Aarhus University
- Aarhus C
- Denmark
| | - M. Bremholm
- Center for Materials Crystallography
- Department of Chemistry and iNANO
- Aarhus University
- Aarhus C
- Denmark
| | - B. B. Iversen
- Center for Materials Crystallography
- Department of Chemistry and iNANO
- Aarhus University
- Aarhus C
- Denmark
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Besnard R, Cambedouzou J, Arrachart G, Diat O, Pellet-Rostaing S. Self-assembly of condensable "bola-amphiphiles" in water/tetraethoxysilane mixtures for the elaboration of mesostructured hybrid materials. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10368-10375. [PMID: 23879565 DOI: 10.1021/la401885t] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The self-assembly of condensable amphiphile molecules in water is an attractive approach for the synthesis of mesostructured hybrid materials. In this article, we focus on aminoundecyltriethoxysilane (AUT), a condensable "bola-amphiphile", i.e., an amphiphilic molecule possessing two polar heads on both sides of an aliphatic chain. In the present case, one side is a condensable triethoxysilane, and the other side is an amino group. We report on the self-assembly of AUT in mixtures of water and tetraethoxysilane (TEOS). In situ small-angle X-ray scattering (SAXS) measurements allowed us to follow the evolution of the structure from the liquid state up to the solid material formed upon catalytic polycondensation. Depending on the medium composition, hexagonal or lamellar structures can be observed in the final material. These observations allowed us to propose a model for the self-assembly of AUT in water/TEOS mixtures that we were able to validate by simulations of the SAXS profiles. By taking advantage of the modularity of such a system, it proves possible to prepare in a simple way various structured hybrid materials possessing a high number of available organic functions without using sacrificial surfactant molecules.
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Affiliation(s)
- R Besnard
- Institut de Chimie Séparative de Marcoule, UMR 5257 CEA/CNRS/UM2/ENSCM, BP17171, F-30207 Bagnols-sur-Cèze, France
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