Photocatalytic Degradation of Butanol in Aqueous Solutions by TiO2 Nanofibers

Pirilä, Minna; Lenkkeri, R.; Goldmann, Werner Marcelo; Kordás, Krisztián; Huuhtanen, Mika; Keiski, Riitta L.

doi:10.1007/s11244-013-0046-x

Cited by 8 publications

(4 citation statements)

References 25 publications

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“…While the electrons accumulated typically on the co-catalyst nanoparticles (Pt, Pd, Rh) are expected to interact with unsaturated and aromatic bonds in organic moieties, holes on the surface of TiO 2 are responsible for the initiation of oxidative processes that may result in C-C bond scission, dehydrogenation or alike [372,421,443]. In the presence of water (medium of reaction or surface adsorbed), moieties such as hydroxyl radicals, peroxides and superoxides form on the surface of illuminated titanias and titanates.…”

Section: Contaminant Degradationmentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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Titanates are salts of polytitanic acid that can be synthesized as nanostructures in a great variety concerning crystallinity, morphology, size, metal content and surface chemistry.Titanate nanotubes (open-ended hollow cylinders measuring up to 200 nm in length and 15 nm in outer diameter) and nanowires (solid, elongated rectangular blocks with length up to 1500 nm and 30-60 nm diameter) are the most widespread representatives of the titanate nanomaterial family. This review covers the properties and applications of these two materials from the surface science point of view. Dielectric, vibrational, electron and X-ray spectroscopic results are comprehensively discussed first, then surface modification methods including covalent functionalization, ion exchange and metal loading are covered. The versatile surface chemistry of onedimensional titanates renders them excellent candidates for heterogeneous catalytic, photocatalytic, photovoltaic and energy storage applications, therefore, these fields are also reviewed.

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Section: Contaminant Degradationmentioning

confidence: 99%

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Kukovecz

Kordás

Kiss

2016

Surface Science Reports

102

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“…16 Alcohols are very important as probes of reactive sites on metal oxides 4,[17][18][19][20] and models in the studies of photooxidation of organic contaminants. 21,22 More importantly, their chemical transformation is needed in the conversion of biomass derived chemicals. On rutile surfaces most of the alcohols adsorbs in a molecular form but a fraction dissociates via O-H bond cleavage.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of small mono- and poly-alcohols on rutile TiO2: a density functional theory study

Carchini

López

2014

Phys. Chem. Chem. Phys.

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We have studied by means of density functional theory including dispersion contributions, the interaction of small chain alcohols with up to four carbons and three hydroxyl groups on the TiO2(110) rutile surface with different reduction degrees. Adsorption takes place through an acid-base interaction that can lead to both molecular and dissociated species. The latter are energetically preferred. Bulk reduction does not apport significant change neither in the structure nor in the adsorption energies, because the electrons are delocalized to a great extent. If vacancies are present at the surface these are the best adsorption sites for primary and secondary monoalcohols. Tertiary or poly-alcohols prefer the Ticus channels, but the reasons for the site preference are different. In the case of bulky alcohols, steric hindrance is the main adsorption-controlling factor, while templating effects of the basic (oxygen) sites on the surface are the key parameters to understand the adsorption of poly-alcohols. Vicinal polyalcohols behave even in a more complex way, for that they prefer the vacancy position only when dissociated, otherwise they stay in the Ticus channel. Our results warn about the use of small surrogates to investigate the chemistry of large alcohols as the adsorption patterns are not only quantitatively but also qualitatively wrong.

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“…Titania and titanate nanostructures and their chemically doped and cocatalyst decorated derivatives have been extensively studied in degrading organic impurities being present water as well as on solid surfaces. While the electrons accumulated typically on the co-catalyst nanoparticles (Pt, Pd, Rh) are expected to interact with unsaturated and aromatic bonds in organic moieties, the holes on the surface of TiO 2 are responsible for the initiation of oxidative processes that may result in C-C bond scission, dehydrogenation and the like [55][56][57][58][59][60][61][62]. Recently, platinum catalysts supported on layered protonated titanate-derived titania nanoarrays were found to have a high activity in CO and NO oxidation as compared to Pt catalysts through wet-impregnation on the anatase TiO 2 [63].…”

Section: General Surwaymentioning

confidence: 99%

Rh-induced Support Transformation and Rh Incorporation in Titanate Structures and Their Influence on Catalytic Activity

et al. 2020

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Rh is one of the most effective metals in several technologically important heterogeneous catalytic reactions, like the hydrogenation of CO2, and CO, the CO+H2O reaction, and methane and ethanol transformations. Titania and titanates are among the most frequently studied supports for Rh nanoparticles. The present study demonstrates that the nature of the support has a marked influence on the specific activity. For comparison, the catalytic activity of TiO2 P25 is also presented. It is pointed out that a certain amount of Rh can be stabilized as cation (Rh+) in ion-exchange positions (i.e., in atomic scale distribution) of the titanate framework. This ionic form does not exists on TiO2. We pay distinguished attention not only to the electronic interaction between Rh metal and the titania/titanate support, but also to the Rh-induced phase transitions of one-dimensional titanate nanowires (TiONW) and nanotubes (TiONT). Support transformation phenomena can be observed in Rh-loaded titanates. Rh decorated nanowires transform into the TiO2(B) phase, whereas their pristine counterparts recrystallize into anatase. The formation of anatase is dominant during the thermal annealing process in both acid-treated and Rh-decorated nanotubes; Rh catalysis this transformation. We demonstrate that the phase transformations and the formation of Rh nanoclusters and incorporated Rh ions affect the conversion and the selectivity of the reactions. The following initial activity order was found in the CO2 + H2, CO + H2O and C2H5OH decomposition reactions: Rh/TiO2 (Degussa P25) ≥ Rh/TiONW > Rh/TiONT. On the other hand it is remarkable that the hydrogen selectivity in ethanol decomposition was two times higher on Rh/TiONW and Rh/TiO(NT) catalysts than on Rh/TiO2 due to the presence of Rh+ cations incorporated into the framework of the titanate structures.

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Photocatalytic Degradation of Butanol in Aqueous Solutions by TiO2 Nanofibers

Cited by 8 publications

References 25 publications

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Atomic scale characterization and surface chemistry of metal modified titanate nanotubes and nanowires

Adsorption of small mono- and poly-alcohols on rutile TiO2: a density functional theory study

Rh-induced Support Transformation and Rh Incorporation in Titanate Structures and Their Influence on Catalytic Activity

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