Shape‐Dependent Acidity and Photocatalytic Activity of Nb<sub>2</sub>O<sub>5</sub> Nanocrystals with an Active TT (001) Surface

Zhao, Yun; Eley, Clive; Hu, Jing; Foord, John S.; Ye, Lin; He, Heyong; Tsang, Shik Chi Edman

doi:10.1002/anie.201108580

Cited by 177 publications

(103 citation statements)

References 19 publications

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“…65 The second scavenger, DMSO, can react quickly with • OH, forming a stable adduct, thus making the DMSO excess in MB solution capture all • OH radicals produced during the photocatalytic process. 51 As shown in Fig. 7a, the use of DMSO in excess considerably decreased the photodegradation rate from 70 40% to 25% after 3 h exposure (the rate constant underwent a decrease of 45%).…”

Section: Evaluation Of Photocatalytic Propertiesmentioning

confidence: 77%

“…On the other 40 hand, if • OH radicals play the major role on the photodegradation process, the reaction rate should be decreased in presence of excess DMSO. 18,33,51 As can be seen in Fig. 7a, the excess of KBrO 3 in MB solution caused a great increase in the photodegradation rate, from around 45 40 % to 48 % after 3 h of exposure to visible-light (the rate constant underwent an increase of 25 %).…”

Section: Evaluation Of Photocatalytic Propertiesmentioning

confidence: 84%

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Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

et al. 2015

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This paper reports the synthesis of monoclinic bismuth vanadate (BiVO 4 ) by the oxidant peroxide method with crystallization under hydrothermal conditions, and its catalytic performance on the photodegradation of pollutants under visible-light. The as-synthesized BiVO 4 materials were characterized by means of XRD, EDX, Raman spectroscopy, UV-Vis DRS and FEG-SEM. The hydrothermal treatment above 80 °C 10 was required to obtain pure monoclinic BiVO 4 phase by releasing V 5+ ions from vanadium peroxo complexes. With the increase in hydrothermal reaction temperature, the particle size decreased. All BiVO 4 samples presented large size and shape distribution and band gap of approximately 2.40 eV. The as-prepared BiVO 4 catalysts showed high photoactivity for decomposition of model pollutants, methylene blue and rhodamine B dyes, under exposure to visible-light. The photodegradation mechanism was 15 evaluated by adding scavengers, DMSO and KBrO 3 , which were used to probe • OH radical and conduction band (CB) electrons, respectively. It was observed that photodegradation of MB and RhB dyes is caused by the action of • OH radicals, and that BiVO 4 CB electrons do not have reduction potential sufficiently high to reduce dissolved oxygen to O 2 -• . It was proven that the indirect mechanism, i.e. • OH radical formation, plays the major role on the BiVO 4 -assisted photodegradation process. 20

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Section: Evaluation Of Photocatalytic Propertiesmentioning

confidence: 77%

Section: Evaluation Of Photocatalytic Propertiesmentioning

confidence: 84%

Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

et al. 2015

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“…14 F À was normally used to attack the niobium metal or niobium oxide precursor to form the uoride containing intermediate compounds (NH 4 ) 2 NbOF 5 . 46,47 Under hydrothermal condition, the (NH 4 ) 2 NbOF 5 may transfer to more stable NH 4 -NbOF 4 by releasing one NH 4 F molecule. The addition of (NH 4 ) 2 SO 4 can adjust the pH value on the Nb metal surface and further promote crystallization on the surface of Nb foil.…”

Section: Resultsmentioning

confidence: 99%

A hierarchical Nb₂O₅@NiFe-MMO rod array, fabricated and used as a structured photocatalyst

et al. 2019

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“…On the other hand, if • OH radicals or direct degradation mechanism, i.e. pollutants directly attacked by VB holes, play a major role in the photodegradation process, the reaction rate should be decreased in the presence of DMSO or SO), respectively (37,55,56). Figure 9 shows the effect of different scavengers in MB photodegradation catalyzed by SAM1 and SAM3 samples.…”

Section: Resultsmentioning

confidence: 99%

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles

Silva

Lopes

Mendonça

et al. 2016

Photochem & Photobiology

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Strontium titanate nanoparticles have attracted much attention due to their physical and chemical properties, especially as photocatalysts under ultraviolet irradiation. In this paper, we analyze the effect of heating rate during the crystallization process of SrTiO3 nanoparticles in the degradation of organic pollutants. The relationship between structural, morphological and photocatalytic properties of the SrTiO3 nanoparticles was investigated using different techniques. Transmission electron microscopy and N2 adsorption results show that particle size and surface properties are tuned by the heating rate of the SrTiO3 crystallization process. The SrTiO3 nanoparticles showed good photoactivity for the degradation of methylene blue, rhodamine B and methyl orange dyes, driven by a nonselective process. The SrTiO3 sample with the largest particle size exhibited higher photoactivity per unit area, independent of the molecule to be degraded. The results pointed out that the photodegradation of methylene blue dye catalyzed by SrTiO3 is caused by the action of valence band holes (direct pathway), and the indirect mechanism has a negligible effect, i.e. degradation by O2 (-•) and (•) OH radicals attack.

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Shape‐Dependent Acidity and Photocatalytic Activity of Nb₂O₅ Nanocrystals with an Active TT (001) Surface

Cited by 177 publications

References 19 publications

Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

A hierarchical Nb₂O₅@NiFe-MMO rod array, fabricated and used as a structured photocatalyst

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles

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Shape‐Dependent Acidity and Photocatalytic Activity of Nb2O5 Nanocrystals with an Active TT (001) Surface

Cited by 177 publications

References 19 publications

Synthesis of BiVO4via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

Synthesis of BiVO4via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

A hierarchical Nb2O5@NiFe-MMO rod array, fabricated and used as a structured photocatalyst

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO3 Nanoparticles

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Product

Resources

About

Shape‐Dependent Acidity and Photocatalytic Activity of Nb₂O₅ Nanocrystals with an Active TT (001) Surface

Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

Synthesis of BiVO₄via oxidant peroxo-method: insights into the photocatalytic performance and degradation mechanism of pollutants

A hierarchical Nb₂O₅@NiFe-MMO rod array, fabricated and used as a structured photocatalyst

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO₃ Nanoparticles