Enhanced photocatalytic activity of octahedral anatase particles prepared by hydrothermal reaction

Wei, Zhishun; Kowalska, Ewa; Wang, K.; Colbeau‐Justin, Christophe; Ohtani, Bunsho

doi:10.1016/j.cattod.2016.04.028

Cited by 14 publications

(12 citation statements)

References 32 publications

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“…In addition, methanol (or another hole scavenger) is added to the titania suspension to hinder the recombination of electrons with holes. However, we have recently found that photodeposition of platinum in the initial presence of oxygen results in the formation of finer Pt NPs that are more uniformly dispersed on the titania support than that performed under anaerobic conditions [60]. In the present study, both kinds of photodeposition were used, i.e., under anaerobic conditions (15-min Ar pre-bubbling) and under aerobic conditions (15-min O 2 pre-bubbling), to investigate their influence on the properties and photocatalytic activities of metal-modified OAPs.…”

Section: Resultsmentioning

confidence: 96%

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Wei

Endo

Wang

et al. 2017

Chemical Engineering Journal

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Section: Resultsmentioning

confidence: 96%

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Wei

Endo

Wang

et al. 2017

Chemical Engineering Journal

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“…For example, photodeposition of Pt and Au is very fast with often undetectable induction periods (almost linear evolution of hydrogen from the beginning of irradiation). 50,57,58,63,64 However, for less noble metals, a longer irradiation time is necessary to reduce respective cations and to form NPs, e.g., 8 min for Cu and 45 min for Ag (during deposition on OAPs). 65 Cu is known for its stronger than Ag activity for methanol dehydrogenation due to its larger work function [ 50,65 The difference between the metal work function and the electron affinity of titania (3.41 to 4.5 eV) [68][69][70][71] is decisive for generation of a Schottky barrier (the electronic potential barrier formed at the metal-semiconductor heterojunction), i.e., the greater the difference between the electron affinity of titania and the work function of metal is, the higher is the Schottky barrier.…”

Section: Preparation Of Mono-and Bimetal-modified Dapmentioning

confidence: 99%

Silver- and copper-modified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst

et al. 2016

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Silverand coppermodified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst,"Abstract. Decahedral anatase particles (DAPs) with eight equivalent (101) facets and two (001) facets were prepared by the gas-phase process. Monometallic and bimetallic photocatalysts were prepared by photodeposition of silver and copper on DAP. It was found that the method of metal deposition (sequential/simultaneous) is crucial for resultant properties and thus for photocatalytic performance. The fastest hydrogen evolution during metal deposition was observed for copper deposited on premodified DAP with silver (DAP/Ag/Cu), probably due to partial coverage of silver with fine clusters of Cu and thus facilitation of proton adsorption and reduction on well-dispersed Cu nanoclusters. Although DAP/Ag/Cu exhibited the fastest rate of hydrogen evolution, single-modified DAP with silver exhibited the best performance for oxidative decomposition of organic compounds under vis irradiation. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…This poor crystallization can cause recombination of photo‐generated electrons and holes (Lv, Yu, Deng, Li, & Li, ), leading to a decrease in MO photocatalytic degradation. In addition, the high proportion of the anatase phase for TiO 2 calcined at 250°C and 300°C enhances photocatalytic degradation (Allen, Mahdjoub, Vishnyakov, Kelly, & Kriek, ; Wei, Kowalska, Wang, Colbeau‐Justin, & Ohtani, ). The performance of TiO 2 calcined at 300°C was similar to that calcined at 250°C because both samples comprised 100% anatase phase.…”

Section: Resultsmentioning

confidence: 99%

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

Adnan

Phattarapattamawong

2019

Water Environment Research

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This work aimed to enhance the photocatalytic degradation of methyl orange (MO) by crystallinity transformation of titanium dioxide (TiO2). In addition, the kinetic degradation of MO was determined. To transform its crystallinity, TiO2 was synthesized using a sol–gel method and calcined at between 200°C to 600°C. Calcination at a temperature of 250°C resulted in TiO2 that showed the best performance, corresponding to MO removal of 87% ± 7%. MO removal by TiO2 calcined between 250°C to 400°C was higher than for commercial TiO2 powder (Sigma‐aldrich) (62% ± 4%). TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO, while the specific surface area and surface roughness seemed to play a minor role. The photocatalytic degradation of MO was NaCl‐independent, while the photocatalytic activity increased with decreased pH. Reused TiO2 showed similar photocatalytic degradation of MO compared with pristine TiO2, at 84 ± 2%. The oxidation kinetics of TiO2 calcined at 250°C were fitted to the Langmuir–Hinshelwood model (R2 = 0.9134). The kr and Ks values were 0.027 mg L−1 min−1 and 0.621 L/mg, respectively. Crystallinity transformation was a major factor in the enhancement of photocatalytic degradation of MO. Practitioner points Photocatalytic activity of TiO2 depends on calcination temperature, pH, and a number of UVC lamps. TiO2 with a small crystallite size and high anatase fraction enhanced the photocatalytic degradation of MO.

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Enhanced photocatalytic activity of octahedral anatase particles prepared by hydrothermal reaction

Cited by 14 publications

References 32 publications

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Noble metal-modified octahedral anatase titania particles with enhanced activity for decomposition of chemical and microbiological pollutants

Silver- and copper-modified decahedral anatase titania particles as visible light-responsive plasmonic photocatalyst

Enhancing photocatalytic degradation of methyl orange by crystallinity transformation of titanium dioxide: A kinetic study

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