Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

Gyulavári, Tamás; Veréb, Gábor; Pap, Zsolt; Dombi, András; Hernádi, Klára

doi:10.1016/j.cattod.2017.11.027

Cited by 9 publications

(8 citation statements)

References 77 publications

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“…Photocatalytic degradation curves of phenol are shown in Figure 3. The reasons for the observed photocatalytic activity order between the peroxo groupcontaining home-made Rutile-H2 and commercial Aldrich rutile, and the well-known commercial Aeroxide P25-which were used as references in this work-have already been described in detail in our previous publication [22]. As expected, sample TiO2_HS_Ac (containing predominantly anatase phase with no well-defined morphology) proved to be the least efficient under visible light irradiation.…”

Section: Photocatalytic Activitysupporting

confidence: 56%

Section: Textural Characterizationmentioning

confidence: 99%

“…Crystal phase distributions, average primary crystallite sizes, and specific surface areas (SSA) are presented in Table 1. Reference photocatalysts were characterized in detail in our previous publication [22]. As a function of CS template purification solvent, the crystal phases of our homemade titania were remarkably different: TiO 2 _HS_Ac contained predominantly anatase phase (79 wt%), whereas TiO 2 _HS_EtOH contained predominantly rutile phase (86 wt%).…”

Section: Textural Characterizationmentioning

confidence: 99%

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Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

et al. 2021

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Carbon spheres were applied as templates to synthesize titanium dioxide hollow spheres. The templates were purified with either ethanol or acetone, and the effects of this treatment on the properties of the resulting titania were investigated. The photocatalytic activity of the catalysts was measured via the decomposition of phenol model pollutant under visible light irradiation. It was found that the solvent used for the purification of the carbon spheres had a surprisingly large impact on the crystal phase composition, morphology, and photocatalytic activity. Using ethanol resulted in a predominantly rutile phase titanium dioxide with regular morphology and higher photocatalytic activity (r0,phenol = 3.9 × 10−9 M∙s−1) than that containing mainly anatase phase prepared using acetone (r0,phenol = 1.2 × 10−9 M∙s−1), surpassing the photocatalytic activity of all investigated references. Based on infrared spectroscopy measurements, it was found that the carbon sphere templates had different surface properties that could result in the appearance of carbonate species in the titania lattice. The presence or absence of these species was found to be the determining factor in the development of the titania’s properties.

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Section: Photocatalytic Activitysupporting

confidence: 56%

Section: Textural Characterizationmentioning

confidence: 99%

Section: Textural Characterizationmentioning

confidence: 99%

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Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

et al. 2021

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“…presenting an intense orange color in solution 58 . These, peroxo groups are also known to significantly enhance the visible light photo-excitation of TiO 2 [60][61][62][63] .…”

Section: Synthesismentioning

confidence: 99%

Synthesis of vacancy-rich titania particles suitable for the additive manufacturing of ceramics

Benavides-Guerrero

Gerlein

Trudeau

et al. 2022

Sci Rep

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In the last decades, titania (or TiO2) particles played a crucial role in the development of photo-catalysis and better environmentally-friendly energy-harvesting techniques. In this work, we engineer a new generation of TiO2 particles rich in oxygen vacancies using a modified sol–gel synthesis. By design, these vacancy-rich particles efficiently absorb visible light to allow carefully-controlled light-induced conversion to the anatase or rutile crystalline phases. FTIR and micro-Raman spectroscopy reveal the formation of oxygen vacancies during conversion and explain this unique laser-assisted crystallization mechanism. We achieve low-energy laser-assisted crystallization in ambient environment using a modified filament 3D printer equipped with a low-power laser printhead. Since the established high-temperature treatment necessary to convert to crystalline TiO2 is ill-suited to additive manufacturing platforms, this work removes a major fundamental hurdle and opens whole new vistas of possibilities towards the additive manufacturing of ceramics, including carefully-engineered crystalline TiO2 substrates with potential applications for new and better photo-catalysis, fuel cells and energy-harvesting technologies.

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“…Interestingly, the degree of crystallinity required to achieve high catalytic activities for different nanomaterials is unequal. [8][9] For example, for BaZrO 3 nanospheres, the ordered internal atom arrangement of crystals with high crystallinity facilitated the free transfer of electrons due to fewer grain boundaries. Thus, better charge separation could improve the activities of BaZrO 3 nanospheres constructed with higher crystallinity.…”

Section: Introductionmentioning

confidence: 99%

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

Zou

et al. 2022

ChemNanoMat

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Ceria nanoparticles were classified as nanozymes because they are able to mimic the activities of some natural enzymes such as superoxide dismutase (SOD), catalase, oxidase and photolyase under given conditions. These functions have driven studies to explore the factors that could promote ceria nanoparticle enzyme activities. Accordingly, factors including size, shape, exposed plane and surface coating that could modulate the enzymatic activities of ceria nanoparticles have been explored. In the present study, we investigated the relationship between ceria nanoparticle crystallinity and SOD-like activity. Two groups of ceria nanoparticles with sizes of several nanometers and tens of nanometers in each group were synthesized with different crystallinities. The ceria nanoparticle crystallinities were closely connected to their Ce 3 + /Ce 4 + ratio, where the lower crystallinity resulted in a higher Ce 3 + concentration and vice versa. The catalytic activity evaluation results indicated that the nanoparticles featuring lower crystallinity exhibited higher SOD-like activity even though the nanoparticles had a smaller specific surface area. The crystallinity-dominated SOD-like activity variation could be sensed by cells, as the nanoparticles featuring lower crystallinity could better protect the cells from paraquat-induced oxidative stress. Therefore, decreasing crystallinity could be an effective way to achieve highly active ceria nanoparticles for SOD-related biological applications.

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Associating low crystallinity with peroxo groups for enhanced visible light active photocatalysts

Cited by 9 publications

References 77 publications

Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

Unexpected Link between the Template Purification Solvent and the Structure of Titanium Dioxide Hollow Spheres

Synthesis of vacancy-rich titania particles suitable for the additive manufacturing of ceramics

Decreasing Crystallinity is Beneficial to the Superoxide Dismutase‐like Activity of Ceria Nanoparticles

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