Exceptional activity for photocatalytic mineralization of formaldehyde over amorphous titania nanofilms

Deng, Xiujuan; Zhu, Xiaobing; Sun, Zhiguang; Li, Xiaosong; Liu, Jing‐Lin; Shi, Chuan; Zhu, Ai‐Min

doi:10.1016/j.cej.2016.08.036

Cited by 21 publications

(27 citation statements)

References 56 publications

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“…Although well-organized titania nanostructures might be easily obtained by a convenient hydrothermal method, such as nanowires (1D), nanotubes (1D), and faceted NPs (0D), other methods are used for the preparation of 2D titania nanostructures since titania films are usually deposited on some supports, such as glass, polyvinyl chloride, and quartz. Therefore, chemical vapor deposition (CVD) [152], plasma-enhanced chemical vapor deposition (PECVD) [153], dc-sputtering [154], anodization (exemplary shown in Figure 11 as "mesopores") [155] and successive-ionic-layeradsorption-and-reaction (SILAR) [156] methods have been proposed for the preparation of 2D titania photocatalysts. However, hydrothermal methods have been also used for the preparation of titania nanoplates (shown in Figure 13) for application as sensors to detect toxic gases [157].…”

Section: Two-dimensional Titaniamentioning

confidence: 99%

“…However, hydrothermal methods have been also used for the preparation of titania nanoplates (shown in Figure 13) for application as sensors to detect toxic gases [157]. An interesting study has been conducted by Deng et al for amorphous titania nanofilms, prepared by the SILAR method from titanium isopropoxide [152]. Surprisingly, the authors obtained higher activity for formaldehyde mineralization on amorphous titania film than that on anatase film.…”

Section: Two-dimensional Titaniamentioning

confidence: 99%

“…and TNT (1D), 2D titania materials have been mainly designed for possible commercial application, considering their continuous use. Therefore, 2D titania nanostructures have been tested for gas and liquid phases' purification, e.g., (i) formaldehyde mineralization in the gas phase [152], (ii) the degradation of 2-(phosphomethylamino)acetic acid and methylene blue, and the inactivation of Micrococcus lutes bacteria in liquid phase [156]. All these studies concluded that titania nanofilms were highly recommended for commercial applications, e.g., using films inside photocatalytic reactors (covering of wall or lamp surfaces) for environmental remediation and disinfection purposes.…”

Section: Two-dimensional Titaniamentioning

confidence: 99%

“…An interesting approach was used by Pietron and coworkers to study the mechanism of plasmonic photocatalysis. Plasmonic photocatalysis, heterogeneous photocatalysis under vis irradiation on a wide bandgap semiconductor (usually titania) modified An interesting study has been conducted by Deng et al for amorphous titania nanofilms, prepared by the SILAR method from titanium isopropoxide [152]. Surprisingly, the authors obtained higher activity for formaldehyde mineralization on amorphous titania film than that on anatase film.…”

Section: Titania Aerogelsmentioning

confidence: 99%

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Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

et al. 2019

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Titania photocatalysts have been intensively examined for both mechanism study and possible commercial applications for more than 30 years. Although various reports have already been published on titania, including comprehensive review papers, the morphology-governed activity, especially for novel nanostructures, has not been reviewed recently. Therefore, this paper presents novel, attractive, and prospective titania photocatalysts, including zero-, one-, two-, and three-dimensional titania structures. The 1D, 2D, and 3D titania structures have been mainly designed for possible applications, e.g., (i) continuous use without the necessity of particulate titania separation, (ii) efficient light harvesting (e.g., inverse opals), (iii) enhanced activity (fast charge carriers' separation, e.g., 1D nanoplates and 2D nanotubes). It should be pointed out that these structures might be also useful for mechanism investigation, e.g., (i) 3D titania aerogels with gold either incorporated inside the 3D network or supported in the porosity, and (ii) titania mesocrystals with gold deposited either on basal or lateral surfaces, for the clarification of plasmonic photocatalysis. Moreover, 0D nanostructures of special composition and morphology, e.g., magnetic(core)-titania(shell), mixed-phase titania (anatase/rutile/brookite), and faceted titania NPs have been presented, due to their exceptional properties, including easy separation in the magnetic field, high activity, and mechanism clarification, respectively. Although anatase has been usually thought as the most active phase of titania, the co-existence of other crystalline phases accelerates the photocatalytic activity significantly, and thus mixed-phase titania (e.g., famous P25) exhibits high photocatalytic activity for both oxidation and reduction reactions. It is believed that this review might be useful for the architecture design of novel nanomaterials for broad and diverse applications, including environmental purification, energy conversion, synthesis and preparation of "intelligent" surfaces with self-cleaning, antifogging, and antiseptic properties.

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Section: Two-dimensional Titaniamentioning

confidence: 99%

Section: Two-dimensional Titaniamentioning

confidence: 99%

Section: Two-dimensional Titaniamentioning

confidence: 99%

Section: Titania Aerogelsmentioning

confidence: 99%

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Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

et al. 2019

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“…Currently, rutile and anatase mixed crystal TiO 2 (such as commercial P25) is commonly used in the preparation of photocatalysts, but amorphous TiO 2 (AmT) as support for Au/TiO 2 has not been reported. More recently, we reported that an AmT with abundant hydroxyl groups and large surface area, favors the rapid transfer of electrons and thus greatly restrains charge carrier recombination . Using AmT to prepare Au/TiO 2 photocatalyst through MI method would possess the following benefits.…”

Section: Introductionmentioning

confidence: 99%

Effect of ammonia‐derived species on visible‐light photocatalytic activity of Au supported on amorphous TiO₂ activated by plasma

Sun

Liu

et al. 2018

Plasma Processes & Polymers

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Amorphous TiO 2 supported Au photocatalyst (Au/AmT) is prepared via modified impregnation method with ammonia washing, followed by cold plasma treatment to activate the photocatalysts. Residual ammonia ([NH 3 ] s ) is formed due to the hydrogen bond between surface OH groups on AmT and ammonia. The [NH 3 ] s suppressed the reduction of Au δ+ and occupied active sites, leading to a poor activity of as-prepared Au/AmT. The performance of cold plasmas in activation strongly depends on discharge gases. N 2 and O 2 plasmas not only cannot reduce Au δ+ into Au 0 but also convert [NH 3 ] s into poisoning species [NO y ] s during activation. H 2 plasma with a strong reducibility can simultaneously reduce Au δ+ and remove [NH 3 ] s , thus enabling Au/AmT to achieve the highest visiblelight photocatalytic activity in CO oxidation. K E Y W O R D S amorphous TiO 2 , Au/TiO 2 photocatalyst, cold plasma, plasma activation, surface plasmon resonance Plasma Process Polym. 2018;15:e1800095. www.plasma-polymers.com

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Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

Liu

Shan

Chen

et al. 2019

Applied Organom Chemis

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Recent advances in photocatalysis focus on the development of materials with hierarchical structure and on the surface plasmon resonance (SPR) phenomenon exhibited by metal nanoparticles (NPs). In this work, both are combined in a material where size-controllable Ag-NPs are uniformly loaded onto the hierarchical microporous and mesoporous and nanocolumnar structures of ZnO, resulting in Ag-NP/ZnO nanocomposites. The embedded Ag-NPs slightly decrease the hydrophobicity of fibrous ZnO, improve its wettability, and increase the absorption of formaldehyde (H 2 CO) onto the photocatalyst, all of this resulting in excellent photodegradation of formaldehyde in aqueous solution. Besides, we found that Ag-NPs with optimal size not only accelerate the charge transfer to the surface of ZnO, but also strengthen the SPR effect in the intercolumnar channels of fibrous ZnO particles combining with high concentration of photo-generated radical species. The micro-to-mesoporous ZnO is like a nanoarray packed Ag-NPs. With Ag-NPs of diameter 2.5 < ϕ < 6.5 nm, ZnO exhibits the most superior photodegradation rate constant value of 0.0239 min −1 with total formaldehyde removal of 97%. This work presents a new feasible approach involving highly sophisticated Ag-NP/ZnO architecture combining the SPR effect and hierarchically ordered structures, which results in high photocatalytic activity for formaldehyde photodegradation.

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Exceptional activity for photocatalytic mineralization of formaldehyde over amorphous titania nanofilms

Cited by 21 publications

References 56 publications

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

Effect of ammonia‐derived species on visible‐light photocatalytic activity of Au supported on amorphous TiO₂ activated by plasma

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

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Exceptional activity for photocatalytic mineralization of formaldehyde over amorphous titania nanofilms

Cited by 21 publications

References 56 publications

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

Morphology- and Crystalline Composition-Governed Activity of Titania-Based Photocatalysts: Overview and Perspective

Effect of ammonia‐derived species on visible‐light photocatalytic activity of Au supported on amorphous TiO2 activated by plasma

Probing nanocolumnar silver nanoparticle/zinc oxide hierarchical assemblies with advanced surface plasmon resonance and their enhanced photocatalytic performance for formaldehyde removal

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Effect of ammonia‐derived species on visible‐light photocatalytic activity of Au supported on amorphous TiO₂ activated by plasma