Novel titanate nanotubes-cyanocobalamin materials: Synthesis and enhanced photocatalytic properties for pollutants removal

Silva, Tiago; Diniz, José Alves; Paixão, Louryval Coelho; Vieira, B.; Barrocas, B.; Nunes, Carla D.; Monteiro, Olinda C.

doi:10.1016/j.solidstatesciences.2016.11.008

Cited by 21 publications

(9 citation statements)

References 44 publications

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“…Both titanate and anatase phase TiO 2 materials onsets were in the UV region. The titanate bandgap of 3.16 eV was close to values in literature,[7a,8a,b] as was the 3.11 eV bandgap of the anatase phase (T). [8a,31a] The red‐shift from titanate to anatase phase fibers was expected, based on an earlier study.…”

Section: Resultssupporting

confidence: 85%

“…Titanates have been used for photocatalysis, and in particular, we note two studies on CO 2 photoreduction . Recent photocatalytic improvements routes using titanate—not limited to CO 2 photoreduction—include the formation of composite materials for improved charge separation[4b,5d,7] and the conversion to a mixed phase anatase/titanate material hydrothermally, while retaining the fiber morphology . Specifically, mixed phase TiO 2 can enhance charge separation and catalytic activity .…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

Crake

Christoforidis

Gregg

et al. 2019

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researchers need to identify efficient routes toward solar fuels production. Solar fuels refer to fuels produced by action of sunlight, particularly H 2 produced from water and C 1 or C 1+ energized molecules (i.e., CO, CH 4 , CH 3 OH) produced from CO 2 . [1] The latter reaction, i.e., CO 2 photo reduction, is the focus of this study. Photo catalysis represents one route toward CO 2 photo reduction. In that case, the design and manufacturing of a costeffective, sustainable, efficient, and robust photo catalyst is of paramount importance and remains a highly challenging task com bining aspects of materials science, photo chemistry, and reactor design engineering.The most widely researched photocata lysts for CO 2 reduction are semiconduc tors. Of which, TiO 2 has inspired intense research since the first demonstration in 1972, [2] owing to its high stability, low cost, and nontoxic nature. These studies have shown that the TiO 2 morphology (e.g., 1D structures), crystalline form (e.g., anatase, rutile, brookite, and titanate), and com position (e.g., heterojunction, heterostuc ture formation) all are critical factors for improved photocatalytic activity. [3] Another example of semicon ductor, considered as a derivative of titania, is titanate. Titanate materials are photocatalytically active, with a crystalline struc ture similar to anatase TiO 2 and a 1D morpho logy. Compared to conventional TiO 2 , they exhibit attractive properties for photoca talysis such as a high surface area, a welldefined morphology, an improved photogenerated charge separation, and a small bandgap. [4] Titanates have been used for photocatalysis, [5] and in particular, we note two studies on CO 2 photoreduction. [6] Recent photocatalytic improvements routes using titanate-not limited to CO 2 photoreduction-include the formation of composite mate rials for improved charge separation [4b,5d,7] and the conversion to a mixed phase anatase/titanate material hydrothermally, while retaining the fiber morphology. [8] Specifically, mixed phase TiO 2 can enhance charge separation and catalytic activity. [9] Despite these improvements, the photocatalytic activity of TiO 2 remains below acceptable levels for large scale deployment due to its large bandgap, rapid photogenerated charge recombination, and low CO 2 adsorption capacity. [10] Metal-organic frameworks (MOFs) have also recently been explored as photocatalysts for CO 2 reduction, with their CO 2 photoreduction to C 1 /C 1+ energized molecules is a key reaction of solar fuel technologies. Building heterojunctions can enhance photocatalysts performance, by facilitating charge transfer between two heterojunction phases. The material parameters that control this charge transfer remain unclear. Here, it is hypothesized that governing factors for CO 2 photoreduction in gas phase are: i) a large porosity to accumulate CO 2 molecules close to catalytic sites and ii) a high number of "points of contact" between the heterojunction components to enhance charge transfer. The former requirement ca...

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

Crake

Christoforidis

Gregg

et al. 2019

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“…This semiconductor has been used for nanopowders, nanorods, nanotubes, and in nanocomposites. It is worth mentioning that having the photocatalyst supported on a suitable surface avoids any subsequent separation process in the reaction system [5]. TiO 2 is a semiconductor that absorbs electromagnetic radiation in the UV region (e.g., <387 nm for the anatase phase), is amphoteric, and chemically stable [6].…”

Section: Introductionmentioning

confidence: 99%

Au-Ag/TiO2 Thin Films Preparation by Laser Ablation and Sputtering Plasmas for Its Potential Use as Photoanodes in Electrochemical Advanced Oxidation Processes (EAOP)

et al. 2021

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Titanium dioxide (TiO2) is widely used, studied, and synthesized using different methodologies. By a modification of the material, it can be applied to wastewater treatment. A combined sputtering-laser ablation setup was used to deposit TiO2 thin films modified, individually and simultaneously, with gold (Au) and silver (Ag). To investigate the effect of the metal incorporation in titanium and its impact on the photocatalytic activity, with dye discoloration as a pollutant compound model, the deposited films were characterized by UV–Vis, photoluminescence, and Raman spectroscopies, as well as by parallel beam X-ray diffraction. The results showed that films with different Au and Ag loads, and an 18 nm average crystallite size, were obtained. These metals have an essential effect on the deposited film’s compositional, structural, and optical properties, directly reflected in its photocatalytic activity. The photocatalytic test results using UV-Vis showed that, after 1 h of applying a 4.8 V electric voltage, a discoloration of up to 80% of malachite green (MG) was achieved, using ultraviolet (UV) light.

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“…Generally, the broad peak present around 3,214–3,600 cm −1 and the low-intensity peak at 1,630 cm −1 are attributed to the stretching vibration of interlayer water molecules and surface OH groups, respectively. In the case of TNTs, the band below 1,200 cm −1 is attributed to Ti-O-Ti vibration and the peak around 490 cm −1 can be interpreted as the crystal lattice vibration of TiO 6 octahedra ( Silva et al, 2017 ). The new absorption peaks in the frequency range of 2,800–2,960 cm −1 in the TNTs-NHSO 3 H catalyst are ascribed to the C-H vibration of the aminopropyl segment ( Pontón et al, 2014 ).…”

Section: Resultsmentioning

confidence: 99%

Titania Nanotubes-Bonded Sulfamic Acid as an Efficient Heterogeneous Catalyst for the Synthesis of n-Butyl Levulinate

et al. 2022

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The titania nanotubes-bonded sulfamic acid (TNTs-NHSO3H) catalyst was designed and successfully fabricated by the post-synthesis modification method. The as-prepared catalyst was characterized by a variety of characterization techniques, including Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) analysis, and thermogravimetry-differential thermal gravimetry (TG-DTG). The crystal structure of the TNTs still maintained during the modification process. Although the BET surface area was decreased, the amount of Brønsted acid sites can be efficiently fabricated on the TNTs. The catalytic activity of TNTs-NHSO3H was examined for the synthesis of n-butyl levulinate (BL) from levulinic acid (LA) and furfuryl alcohol (FA). A relatively high selectivity (99.6%) at 99.3% LA conversion was achieved for esterification of levulinic acid owing to the strong Brønsted acidity sites. And also, the TNTs-NHSO3H catalyst exhibited a higher reactivity for alcoholysis of FA and the yield of BL reached 90.4% with 100% FA conversion was obtained under the mild conditions.

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Novel titanate nanotubes-cyanocobalamin materials: Synthesis and enhanced photocatalytic properties for pollutants removal

Cited by 21 publications

References 44 publications

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

Au-Ag/TiO2 Thin Films Preparation by Laser Ablation and Sputtering Plasmas for Its Potential Use as Photoanodes in Electrochemical Advanced Oxidation Processes (EAOP)

Titania Nanotubes-Bonded Sulfamic Acid as an Efficient Heterogeneous Catalyst for the Synthesis of n-Butyl Levulinate

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Novel titanate nanotubes-cyanocobalamin materials: Synthesis and enhanced photocatalytic properties for pollutants removal

Cited by 21 publications

References 44 publications

The Effect of Materials Architecture in TiO2/MOF Composites on CO2 Photoreduction and Charge Transfer

The Effect of Materials Architecture in TiO2/MOF Composites on CO2 Photoreduction and Charge Transfer

Au-Ag/TiO2 Thin Films Preparation by Laser Ablation and Sputtering Plasmas for Its Potential Use as Photoanodes in Electrochemical Advanced Oxidation Processes (EAOP)

Titania Nanotubes-Bonded Sulfamic Acid as an Efficient Heterogeneous Catalyst for the Synthesis of n-Butyl Levulinate

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The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer

The Effect of Materials Architecture in TiO₂/MOF Composites on CO₂ Photoreduction and Charge Transfer