Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Janczarek, Marcin; Kowalska, Ewa; Ohtani, Bunsho

doi:10.1016/j.cej.2016.01.008

Cited by 50 publications

(44 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The photocatalytic performance of Cu2O@TiO2 polyhedra was different with that of pure Cu2O polyhedra without TiO2 shells, which could be attributed to the different driving forces for the charge carrier separation [105]. It is well known that controlled morphology by application of exposed facets (faceted semiconductors) significantly enhances photocatalytic performance, due to excellent crystallinity and low content of defects, e.g., octahedral and decahedral anatase particles [103,104]. Therefore, it is not surprising that similar concept was applied for copper oxide-titania heterojunction systems.…”

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

“…After shutting off the irradiation, these trapped electrons could be gradually released from TiO 2 to react with O 2 producing reactive radicals, which imparted the photocatalytic memory effect to Cu 2 O-NS/TiO 2 -NI photocatalyst ( Figure 15) [102]. It is well known that controlled morphology by application of exposed facets (faceted semiconductors) significantly enhances photocatalytic performance, due to excellent crystallinity and low content of defects, e.g., octahedral and decahedral anatase particles [103,104]. Therefore, it is not surprising that similar concept was applied for copper oxide-titania heterojunction systems.…”

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

See 1 more Smart Citation

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

2017

Self Cite

View full text Add to dashboard Cite

Modification of titania with copper is a promising way to enhance the photocatalytic performance of TiO 2 . The enhancement means the significant retardation of charge carriers' recombination ratio and the introduction of visible light activity. This review focuses on two main ways of performance enhancement by copper species-i.e., originated from plasmonic properties of zero-valent copper (plasmonic photocatalysis) and heterojunctions between semiconductors (titania and copper oxides). The photocatalytic performance of copper-modified titania is discussed for oxidative reaction systems due to their importance for prospective applications in environmental purification. The review consists of the correlation between copper species and corresponding variants of photocatalytic mechanisms including novel systems of cascade heterojunctions. The problem of stability of copper species on titania, and the methods of its improvement are also discussed as important factors for future applications. As a new trend in the preparation of copper-modified titania photocatalyst, the role of particle morphology (faceted particles, core-shell structures) is also described. Finally, in the conclusion section, perspectives, challenges and recommendations for future research on copper-modified titania are formulated.

show abstract

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

Section: Cu 2 O-tio 2 Heterojunctionmentioning

confidence: 99%

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…[48][49][50][51][52][53] 2 Experimental Details DAPs were prepared by the gas-phase method, as reported elsewhere. 54 In brief, DAPs were prepared from titanium(IV) chloride (TiCl 4 ) and oxygen by rapid heating and quenching of the gas reaction mixture, which hindered the formation of perfect anatase crystals [octahedral anatase particles (OAPs)]. 55 TiCl 4 was fed continuously to a vaporizer heated at 453 K through which argon passed to introduce TiCl 4 into a quartz tube set in an infrared furnace.…”

mentioning

confidence: 99%

“…Properties of samples were analyzed by diffuse reflectance spectroscopy (DRS; JASCO V-670 equipped with a PIN-757 integrating sphere), X-ray powder diffraction (XRD; Rigaku intelligent XRD SmartLab with a Cu target), X-ray photoelectron spectroscopy (XPS; JEOL JPC-9010MC with MgKα X-ray), scanning electron microscopy (SEM; JEOL JSM-7400F), and scanning transmission electron microscopy (STEM) equipped with an energy-dispersive X-ray spectroscopy (STEM-EDS, HITACHI HD-2000). 54,59 For DRS analysis, barium sulfate and bare facetted anatase (DAP) were used as references.…”

mentioning

confidence: 99%

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

et al. 2016

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Accordingly, it was proposed that: (i) large particle size resulted in efficient oxygen evolution, (ii) large specific surface area (small crystallite and particle sizes) in methanol dehydrogenation (H 2 system), (iii) anatase presence in oxidative decomposition of acetic acid (CO 2 system), (iv) rutile presence and defects' content in oxidative decomposition of acetaldehyde and (v) rutile presence in organic synthesis. In our previous study, the higher activity in both reaction systems (CO 2 and H 2 ) than that by P25 was only obtained for faceted anatase sample of decahedral shape (decahedral anatase particles, DAPs [69]) with intrinsic properties of charge carriers' separation, i.e., the migration of electrons to {101} and holes to {001} facets [70,71].…”

Section: Photocatalytic Activitymentioning

confidence: 91%

Carbon/Graphene-Modified Titania with Enhanced Photocatalytic Activity under UV and Vis Irradiation

et al. 2019

Self Cite

View full text Add to dashboard Cite

Laser synthesis was used for one-step synthesis of titania/graphene composites (G-TiO 2 (C)) from a suspension of 0.04 wt% commercial reduced graphene oxide (rGO) dispersed in liquid titanium tetraisopropoxide (TTIP). Reference titania sample (TiO 2 (C)) was prepared by the same method without graphene addition. Both samples and commercial titania P25 were characterized by various methods and tested under UV/vis irradiation for oxidative decomposition of acetic acid and dehydrogenation of methanol (with and without Pt co-catalyst addition), and under vis irradiation for phenol degradation and inactivation of Escherichia coli. It was found that both samples (TiO 2 (C) and G-TiO 2 (C)) contained carbon resulting from TTIP and C 2 H 4 (used as a synthesis sensitizer), which activated titania towards vis activity. The photocatalytic activity under UV/vis irradiation was like that by P25. The highest activity of TiO 2 (C) sample for acetic acid oxidation was probably caused by its surface enrichment with hydroxyl groups. G-TiO 2 (C) was the most active for methanol dehydrogenation in the absence of platinum (ca. five times higher activity than that by TiO 2 (C) and P25), suggesting that graphene works as a co-catalyst for hydrogen evolution. High activity under both UV and vis irradiation for decomposition of organic compounds, hydrogen evolution and inactivation of bacteria suggests that laser synthesis allows preparation of cheap (carbon-modified) and efficient photocatalysts for broad environmental applications.

show abstract

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Cited by 50 publications

References 51 publications

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

On the Origin of Enhanced Photocatalytic Activity of Copper-Modified Titania in the Oxidative Reaction Systems

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

Carbon/Graphene-Modified Titania with Enhanced Photocatalytic Activity under UV and Vis Irradiation

Contact Info

Product

Resources

About