Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Kapridaki, Chrysi; Xynidis, Nikolaos; Vazgiouraki, Eleftheria; Maravelaki-Kalaitzaki, P.

doi:10.3390/ma12111847

Cited by 21 publications

(13 citation statements)

References 39 publications

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“…There are two main ways to retard the electron-hole recombination in TiO 2 : (i) the generation of irregularities or surface defects, or (ii) the modification of TiO 2 with a metal, creating a Shottky barrier in the junction zone between the two materials that would limit the recombination process, by flowing electrons generated from the valence band of TiO 2 to the metal [ 12 ]. Noble metals such as Pt, Pd or Au [ 10 , 13 ] have been found to be particularly effective though there is a need to use some more cost-effective transition metals such as Fe, Cu or Ni [ 14 , 15 , 16 ]. This barrier can also be created by modifying TiO 2 with carbon nanostructures, such as nanotubes or graphene [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

et al. 2020

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Olive leaves (by-product from olive oil production in olive mills) were used as biotemplates to synthesize a titania-based artificial olive leaf (AOL). Scanning electron microscopy (SEM) images of AOL showed the successful replication of trichomes and internal structure channels present in olive leaves. The BET surface area of AOL was 52 m2·g−1. X-ray diffraction (XRD) and Raman spectra revealed that the resulting solid was in the predominantly-anatase crystalline form (7.5 nm average particle size). Moreover, the synthesis led to a red-shift in light absorption as compared to reference anatase (gap energies of 2.98 and 3.2 eV, respectively). The presence of surface defects (as evidenced by X-ray photoelectron spectroscopy, XPS, and electron paramagnetic resonance spectroscopy, EPR) and doping elements (e.g., 1% nitrogen, observed by elemental analysis and XPS) could account for that. AOL was preliminarily tested as a catalyst for hydrogen production through glycerol photoreforming and exhibited an activity 64% higher than reference material Evonik P25 under solar irradiation and 144% greater under ultraviolet radiation (UV).

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Section: Introductionmentioning

confidence: 99%

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

et al. 2020

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“…The charged ions get adsorbed into cell surface which causes the deterioration of the cell membrane resulting in the collapse of membrane potential and hence membrane becomes more permeable. The super oxide radicals formed by the combination of electron and oxygen molecules and H + ions result in the production of H 2 O 2 molecules, which can penetrate through the bacterial cell membrane with its disorganization and damage the protein, lipids and DNA and thus leading to the destruction of the bacteria 60,61 . Furthermore, the presence of PMMA results in better antibacterial activity which is inferred from the more inhibition percentage shown by TZP and TZPPF microspheres than TZPF microspheres.…”

Section: Resultsmentioning

confidence: 99%

Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Simon

George

Chandran³

et al. 2021

J of Applied Polymer Sci

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The applications of self‐cleaning coatings on large scale are limited due to their poor durability, remnants of hazardous by‐products and lack of biocompatibility. We propose to solve this problem by developing TiO2‐ZrO2 composite‐based self cleaning coatings. In order to achieve this task another important aspect was to select biocompatible polymers poly (methyl methacrylate) and pluronic F‐127 (PF‐127) as they can enhance the self‐cleaning capability of TiO2‐ZrO2 which itself is biocompatible and endowed with anti‐bacterial capability. The selection of a preparation technique that could produce coatings mimicking the nature has also been important and hence Electrospraying technique was selected as the processing method. The samples were then characterized using various techniques like field emission scanning electron microscopy, X‐ray diffraction, high resolution transmission electron microscopy, Brunauer–Emmett–Teller analysis, and so forth to fathom the interlink between observed properties and morphology. High quality superhydrophobic and superhydrophilic films have been generated and the surfaces were modulated by the addition of tri‐block co‐polymer which was found to provide swapping of superhydrophobic nature to superhydrophilic nature. The integration of superhydrophobic, superhydrophilic, photocatalytic and antibacterial properties in the prepared microsphere coatings is a unique achievement and may interest those in the quest for self‐cleaning materials for antibacterial coatings in mitigating surgical site infections, medical implants, coronary stent surfaces, and so forth.

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“…reported photocatalytic organic degradation for TiO 2 with different Fe contents. [ 49 ] When the Fe content was above 0.2 wt%, the rate of photodegradation produced by the Fe‐TiO 2 samples was slower than pristine TiO 2 . The Fe (0.1 wt%) doped TiO 2 had the best photocatalytic performance, due to the structural oxygen deficiency in the TiO 2 lattice.…”

Section: Modifying Strategies To Enhance the Photocatalytic Activity mentioning

confidence: 99%

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

Jeon

Kweon

Jang

et al. 2020

Advanced Sustainable Systems

102

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charge separation and intrinsic efficiency, which are limited by the material's wide bandgap (≈3 eV). To overcome these issues, countless studies have focused on modifying the properties of TiO 2 , such as controlling its crystal structures, morphologies, vacancies, and doping. Existing natural TiO 2 polymorphs, the anatase and rutile phases, are generally considered representative photocatalytic materials. However, brookite has not been actively studied because in the past it has been difficult to synthesize. Anatase is known to more efficiently separate photoexcited charge carriers than rutile, but its thermodynamic stability has the reverse tendency. [14,15] While studying the different properties of various TiO 2 crystal structures, morphology-dependent characteristics have also been investigated, including efficient charge carrier dynamics, which include longer charge carrier diffusion length than the particle size to separate charges suppressing charge recombination. In addition to these high-crystalline-controlled studies, defect engineering approaches have also been vigorously investigated, to extend the material's light absorption range from the ultraviolet (UV) region to visible light. The general method used to enhance photocatalytic performance has been to introduce defects into TiO 2 structures, by chemical and physical doping, and induce vacancies in titanium (Ti) or oxygen (O) positions. These defect engineering strategies create new energy states, which act as charge trapping sites or narrowing bandgap to extend light absorption region. The formation of new energy states and defect sites is dependent on synthesis methods and conditions, indicating that predicting property and mechanism of synthesized TiO 2 materials is difficult before testing catalytic reactions. This uncertainty is one of the main problems to design new high-performance catalysts. Up to now, numerous researches have been reported to enhance photocatalytic activities and to reveal the mechanism. Even though it has not been confirmed the mechanism and activity for all situations, we can get insight for comprehensive understanding to predict and to design new catalysts. This work reviews modifying strategies of TiO 2 materials to enhance their photocatalytic activity with categorizing in the several systems. First, the basic principles of photocatalytic reactions on TiO 2 are described. Second, the characteristics of surface modification with other elements and doped systems in the lattice of photocatalysts are discussed. Finally, multicomponent heterostructure systems and current photocatalyst To address energy and environmental problems, innumerable titanium dioxide (TiO 2)-based photocatalysts have been reported over the last four decades. TiO 2 has attracted immense interest because it is low-cost, abundant, and photoresponsive. Sunlight-driven fuel production is one of the ideal photocatalytic approaches in terms of economics and the environment. However, performance issues with TiO 2 photocatalysts remain, including insuffici...

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Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Cited by 21 publications

References 39 publications

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Enhancing the Photocatalytic Activity of TiO₂ Catalysts

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Characterization of Photoactive Fe-TiO2 Lime Coatings for Building Protection: The Role of Iron Content

Cited by 21 publications

References 39 publications

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Olive Leaves as Biotemplates for Enhanced Solar-Light Harvesting by a Titania-Based Solid

Robust polymer incorporated TiO2‐ZrO2 microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Enhancing the Photocatalytic Activity of TiO2 Catalysts

Contact Info

Product

Resources

About

Robust polymer incorporated TiO₂‐ZrO₂ microsphere coatings by electrospraying technique with excellent and durable self cleaning, antibacterial and photocatalytic functionalities

Enhancing the Photocatalytic Activity of TiO₂ Catalysts