Hydrothermal modification of TiO2 nanotubes in water and alkali metal electrolytes (LiNO3, NaNO3, KNO3) – Direct evidence for photocatalytic activity enhancement

Wtulich, Mariusz; Szkoda, Mariusz; Gajowiec, Grzegorz; Jurak, Kacper; Trykowski, Grzegorz; Lisowska-Oleksiak, Anna

doi:10.1016/j.electacta.2022.140802

Cited by 6 publications

(3 citation statements)

References 75 publications

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“…The most commonly used electrolytes in the anodic production of fourth-generation oxide nanotubes are based on HCl [7,8], H2O2 [8,9] and their aqueous solutions, as well as mixtures of oxalic acid [10], formic acid [10], and sulfuric acid [11]. Fourth-generation oxide nanotubes are also obtained from aqueous solution of AgNO3 [12], SrNO3, NaNO3, and KNO3 [13]. The mechanism for obtaining oxide nanotubes from non-fluoride solutions is different than in the case of baths containing fluoride ions.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Oxide Nanotubes on Titanium Surface for Use in Controlled Drug Release Systems

Osak,

Skwarek,

Łukowiec

et al. 2024

Preprint

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Preventing or treating infections at implantation sites where the risk of bacterial contamination is high requires the development of intelligent drug delivery systems. In this work, honeycomb structures as a potential drug carrier were obtained for the first time in a fast, one-step anodization process of titanium grade 4, lasting only 60 seconds. Fourth generation oxide nanotube layers were obtained from an aqueous solution of 0.5% AgNO3 in the voltage range from 50 to 80 at 15(1) °C. The FE-SEM method showed the length of the oxide nanotubes from 1.02(2) µm at 50 V to 230(8) nm at 80 V. The EDS analysis revealed that during anodizing, silver particles are deposited on the Ti G4 up to 2.2(5) wt.%. Electrochemical measurements by open circuit potential and anodic polarization curves methods proved the improvement of in vitro corrosion resistance as a result of Ti G4 anodizing. Assessment of the anodized Ti G4 as gentamicin sulfate carrier carried out using ATR-FTIR and UV-VIS absorption spectroscopy revealed that the obtained oxide nanotube layers can be used for application of drugs directly to the tissue around the implant. This method of application allows full use of the therapeutic dose of the antibiotic used.

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Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Oxide Nanotubes on Titanium Surface for Use in Controlled Drug Release Systems

Osak,

Skwarek,

Łukowiec

et al. 2024

Preprint

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“…On the other hand, TiO 2 photocatalysts have some disadvantages, including a low specific surface area, a high recombination rate, and a high band gap energy value [24]. The surface of TiO 2 can be improved by modifying its morphology into the shape of nanorods [24,25], nanowires [26,27], and nanotubes [23,26,28,29]. Nanotube morphology is often used because it has a larger surface area and is more effective in photocatalysis than other morphologies [26].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, dyes can easily adhere to the catalyst surface; thus, the electrons readily achieve an excited state by photon absorption in the visible light spectrum range [31][32][33]. Synthetic metal-based dyes can be used as sensitizers, but they can decompose quickly in the working solution [28,29]. Therefore, natural dyes are interesting alternative sensitizers in the photodegradation of aqueous organic contaminants.…”

Section: Introductionmentioning

confidence: 99%

The Addition of Anthocyanin as a Sensitizer for TiO2 Nanotubes in a Combined Process of Electrocoagulation and Photocatalysis for Methylene Blue Removal

Kustiningsih,

Pujiastuti,

Sari

et al. 2023

Sustainability

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Photocatalysis with TiO2 semiconductors is one of several potential methods for removing Methylene Blue (MB) that is environmentally friendly, relatively cheap, and effective. The capability of TiO2 photocatalysts for degrading MB can be improved by modifying the morphology of TiO2 into nanotubes and adding anthocyanin sensitizers. The objective of this study was to investigate the effect of anthocyanin sensitizer addition for TiO2 nanotubes on MB removal using a combined process of electrocoagulation and photocatalysis. TiO2 nanotubes were prepared through an anodization method with a glycerol electrolyte containing NH4F of 0.5%w/v and water of 25%v/v. The cathode and anode used in the electrocoagulation process were 316 stainless steel and aluminum, respectively. The characteristics of the resulting TiO2 nanotubes were analyzed using SEM-EDX, UV–Vis DRS, and XRD analyses. The results showed that the electrocoagulation at a pH of 10 and a voltage of 50 volts resulted in an MB removal efficiency of 57.88%. In the photocatalysis process, sensitizer addition can increase the MB removal efficiency from 19.71% to 29.06%. Furthermore, a combined process of electrocoagulation and photocatalysis without and with sensitizer addition resulted in MB removal efficiencies of 59.66% and 64.30%, respectively.

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Mesoporous TiO2 and Fe-containing TiO2 prepared by solution combustion synthesis as catalysts for the photodegradation of paracetamol

Grifasi,

Deorsola,

Fino

et al. 2024

Environ Sci Pollut Res

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Water pollution due to emerging contaminants, e.g., pharmaceuticals, is one of the most frequently discussed issues. Among them, paracetamol received great attention due to its physico-chemical properties, persistence, and adverse environmental effects. Different techniques were employed for its degradation and, among them, photodegradation is considered one of the most suitable to pursue the aim. This work aimed to synthesize mesoporous TiO2, even with the presence of iron, through a one-pot method, with an enhanced ability to abate paracetamol. Precisely, pure and iron-containing (3.5 wt%) TiO2 were successfully obtained employing an uncommon procedure for this kind of material, mainly solution combustion synthesis (SCS). Moreover, a traditional hydrothermal method and a commercial Degussa P25 were also investigated for comparison purposes. The samples were characterized through N2-physisorption at − 196 °C, XRD, XPS, EDX, DR UV-Vis, and FESEM analysis. The catalytic activity was investigated for the abatement of 10 ppm of paracetamol, under UV irradiation in acidic conditions (pH = 3) and in the presence of H2O2. As a whole, the best-performing catalysts were those obtained through the SCS procedure, highlighting a complete removal of the organic pollutant after 1 h in the case of Fe/TiO2_SCS, thanks to its highly defective structure and the presence of metal Fe. To better investigate the performance of both pure and Fe-containing SCS samples, further oxidation tests were performed at pH = 7 and in the absence of H2O2. Noteworthy, in these conditions, the two samples exhibited different behaviors, highlighting different mechanisms depending on the presence or absence of iron in the structure. Finally, a kinetic study was conducted, demonstrating that a first order is suitable for its abatement. Graphical abstract

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Hydrothermal modification of TiO2 nanotubes in water and alkali metal electrolytes (LiNO3, NaNO3, KNO3) – Direct evidence for photocatalytic activity enhancement

Cited by 6 publications

References 75 publications

Preparation and Characterization of Oxide Nanotubes on Titanium Surface for Use in Controlled Drug Release Systems

Preparation and Characterization of Oxide Nanotubes on Titanium Surface for Use in Controlled Drug Release Systems

The Addition of Anthocyanin as a Sensitizer for TiO2 Nanotubes in a Combined Process of Electrocoagulation and Photocatalysis for Methylene Blue Removal

Mesoporous TiO2 and Fe-containing TiO2 prepared by solution combustion synthesis as catalysts for the photodegradation of paracetamol

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