Single-step fabrication of highly stable amorphous TiO2 nanotubes arrays (am-TNTA) for stimulating gas-phase photoreduction of CO2 to methane

Santos, Janaína S.; Fereidooni, Mohammad; Márquez, Victor; Arumugam, Malathi; Tahir, Muhammad Nawaz; Praserthdam, Supareak; Praserthdam, Piyasan

doi:10.1016/j.chemosphere.2021.133170

Cited by 27 publications

(7 citation statements)

References 69 publications

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“…The O 2 ‐TPD profiles for TiO x catalysts are represented in Figure 4(a), which includes three typical desorption peaks [72–78] . The O 2 ‐species, which are physically adsorbed, are responsible for the first peak (α) at about 110 °C.…”

Section: Resultsmentioning

confidence: 99%

“…The O 2 ‐species, which are physically adsorbed, are responsible for the first peak (α) at about 110 °C. The second peak (denoted as β) whose center of peak shifted in the region of 410 °C and 440 °C was associated with oxygen defects and was considered as chemical adsorption oxygen (O − ) [72,73,75,78] . Whereas the γ peak, which appeared at temperatures higher than 600 °C, was caused by O 2− from the lattice.…”

Section: Resultsmentioning

confidence: 99%

“…The O 2 -TPD profiles for TiO x catalysts are represented in Figure 4(a), which includes three typical desorption peaks. [72][73][74][75][76][77][78] The O 2 -species, which are physically adsorbed, are responsible for the first peak (α) at about 110 °C. The second peak (denoted as β) whose center of peak shifted in the region of 410 °C and 440 °C was associated with oxygen defects and was considered as chemical adsorption oxygen (O À ).…”

Section: Introductionmentioning

confidence: 99%

“…The second peak (denoted as β) whose center of peak shifted in the region of 410 °C and 440 °C was associated with oxygen defects and was considered as chemical adsorption oxygen (O À ). [72,73,75,78] Whereas the γ peak, which appeared at temperatures higher than 600 °C, was caused by O 2À from the lattice. The O 2 desorption peaks for Bl-TiO x minor shift clearly to lower temperatures compared to the O 2 -TPD peaks of other TiO x FLPs catalysts (Figure 4(a)), which could suggest that the activation of surface-adsorbed oxygen was promoted.…”

Section: Introductionmentioning

confidence: 99%

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The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

Yazdanpanah,

Fereidooni,

Márquez

et al. 2023

ChemSusChem

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Recently, interest in converting bio‐derived fatty acid methyl esters (FAMEs) into added‐value products has significantly increased. The selectivity of ketonization reaction in the conversion of the FAMEs has significantly hampered the efficiency of this process. Herein, we prepared catalysts with different levels of oxygen vacancies while the crystal phase remained unchanged. The catalyst with the highest level of oxygen vacancy exhibited the maximum selectivity. The density functional theory (DFT) simulation showed an increase in interatomic distances leading to the formation of frustrated Lewis pairs (FLPs) upon the creation of oxygen vacancies. The surface measurements, type and density of acid sites of the catalysts, showed that the Lewis acid sites enhanced the selectivity for ketone production; while Bronsted acid sites increased the formation of by‐products. Moreover, the ketone formation rate was directly proportional to acid density. The findings of this research provide a different approach for catalyst design, based on defects engineering and their effect on the surface activity, which could be used for enhancing the catalytic performance of novel metal oxides.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

Yazdanpanah,

Fereidooni,

Márquez

et al. 2023

ChemSusChem

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“…TNTs are Molecules 2022, 27, 3881 2 of 18 one-dimensional hollow structures. Preparation methods mainly include template synthesis [10], anodic oxidation [11], and hydrothermal synthesis [12]. Two different TiO 2 structures can produce reactive oxygen species to induce oxidative stress and destroy the cell walls of bacteria, thus exerting antibacterial activity and having strong mechanical properties in stomatology [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Applications of Titanium Dioxide Nanostructure in Stomatology

Liu

Chen

et al. 2022

Molecules

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Breakthroughs in the field of nanotechnology, especially in nanochemistry and nanofabrication technologies, have been attracting much attention, and various nanomaterials have recently been developed for biomedical applications. Among these nanomaterials, nanoscale titanium dioxide (nano-TiO2) has been widely valued in stomatology due to the fact of its excellent biocompatibility, antibacterial activity, and photocatalytic activity as well as its potential use for applications such as dental implant surface modification, tissue engineering and regenerative medicine, drug delivery carrier, dental material additives, and oral tumor diagnosis and treatment. However, the biosafety of nano-TiO2 is controversial and has become a key constraint in the development of nano-TiO2 applications in stomatology. Therefore, in this review, we summarize recent research regarding the applications of nano-TiO2 in stomatology, with an emphasis on its performance characteristics in different fields, and evaluations of the biological security of nano-TiO2 applications. In addition, we discuss the challenges, prospects, and future research directions regarding applications of nano-TiO2 in stomatology that are significant and worthy of further exploration.

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COF‐5/CoAl‐LDH Nanocomposite Heterojunction for Enhanced Visible‐Light‐Driven CO₂ Reduction

Zhou

Chen

et al. 2022

ChemSusChem

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Photocatalytic conversion of CO 2 into value-added chemical fuels is an attractive route to mitigate global warming and the energy crisis. Reasonable design of optical properties and electronic behavior of the photocatalyst are essential to improve their catalytic activity. Herein, the 1D/2D heterojunction by direct in-situ synthesis of the covalent organic framework (COF)-5 colloid on the surface of CoAl layered double hydroxide (LDH) was used as the prospective photocatalyst for CO 2 reduction. COF-5/CoAl-LDH nanocomposite achieved 265.4 μmol g À 1 of CO with 94.6 % selectivity over CH 4 evolution in 5 h under visible light irradiation, which was 4.8 and 2.3 times higher than those of COF-5 colloid and CoAl-LDH, respectively. The enhanced catalytic activity was derived from the increased visible-light activity and the construction of type II-2 heterojunction, which greatly optimized visible light harvesting and accelerated the efficient separation of the photoinduced holes and electrons. This work paves the way for rational design of heterojunction catalysts in photocatalytic CO 2 reduction.

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Single-step fabrication of highly stable amorphous TiO2 nanotubes arrays (am-TNTA) for stimulating gas-phase photoreduction of CO2 to methane

Cited by 27 publications

References 69 publications

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

Applications of Titanium Dioxide Nanostructure in Stomatology

COF‐5/CoAl‐LDH Nanocomposite Heterojunction for Enhanced Visible‐Light‐Driven CO₂ Reduction

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Single-step fabrication of highly stable amorphous TiO2 nanotubes arrays (am-TNTA) for stimulating gas-phase photoreduction of CO2 to methane

Cited by 27 publications

References 69 publications

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiOx Catalysts

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiOx Catalysts

Applications of Titanium Dioxide Nanostructure in Stomatology

COF‐5/CoAl‐LDH Nanocomposite Heterojunction for Enhanced Visible‐Light‐Driven CO2 Reduction

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The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

The Underlying Catalytic Role of Oxygen Vacancies in Fatty Acid Methyl Esters Ketonization over TiO_x Catalysts

COF‐5/CoAl‐LDH Nanocomposite Heterojunction for Enhanced Visible‐Light‐Driven CO₂ Reduction