Influence of Semiconductor Morphology on Photocatalytic Activity of Plasmonic Photocatalysts: Titanate Nanowires and Octahedral Anatase Nanoparticles

Wei, Zhishun; Endo‐Kimura, Maya; Wang, Kunlei; Colbeau‐Justin, Christophe; Kowalska, Ewa

doi:10.3390/nano9101447

Cited by 19 publications

(9 citation statements)

References 103 publications

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“…The synthesized materials have shown interesting textural and morphological properties which support their use as photocatalysts in different processes. [108][109][110][111] Most of the photo catalytic processes described for titanium dioxidebased sys tems are focused on environmental issues, however, there are several other options for these materials in energyrelated tech nologies, such as for example water splitting, [6] solar cell com ponents, [106] and/or dehalogenation of solid or liquid wastes. [71] The possibility of degrading pollutants from an energy source that is harmless to nature, such as visible light, opens up a wide range of possibilities for the materials prepared in this work.…”

Section: Applications Of the Materials In Catalytic And Photocatalytic Processesmentioning

confidence: 99%

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Díaz-Sánchez

Murgu

Díaz-García

et al. 2021

Advanced Sustainable Systems

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This material has been used as a photo catalyst for water splitting since 1972 when Fujishima and Honda reported its ability to generate hydrogen and oxygen from water molecules. [1] Titanium dioxide is normally used in advanced oxidation processes, [2] in systems capable of elimi nating a wide variety of chemicals in air and water, as well as solar fuel production (such as H 2 ). [3,4] The photoactivated pro cesses of titanium dioxidebased photo catalysts are achieved when the irradiation energy is higher than its band gap. This generates electrons in the conduction band and holes in valence band, which rapidly migrate to the TiO 2 surface and provoke the generation of extremely reactive spe cies. For example, H 2 O 2 and the radicals OH • , O 2-• formed after the electron and the holes reach the external surface of titanium dioxide, are very important for the photodecomposition of organic pol lutants to CO 2 and H 2 O, which is true for the most active titanium dioxidebased materials. [5,6] The band gap value has a direct impact on the rate of electronhole (e --h +) recombination during the photocatalytic processes. In the case of titanium dioxide, the relatively large band gap, means there is a slow recombination rate compared to most of the other photocatalysts. [7] Three main phases are present in TiO 2 : 1) Anatase (tetrag onal, a = b = 3.785 Å, c = 9.54 Å), 2) brookite (orthorhombic, a = 5.143 Å, b = 5.456 Å, c = 9.182 Å), and 3) rutile (tetragonal a = b = 4.593 Å, c = 2.959 Å). [8,9] The thermodynamically meta stable phases, anatase, and brookite, irrevocably pass into the stable phase of rutile at high temperatures. [7] Each of these phases show its own morphological characteristics and band gap value: In the case of anatase the band gap is of 3.2 eV, while rutile and brookite have band gaps of 3.0 and 3.3 eV, respec tively. In general, anatase shows the most attractive photocata lytic behavior due to its versatility and textural properties. [10][11][12] However, the anatase phase, due to its band gap, can only be activated by UV light, which accounts for approximately only 4% of the solar spectrum. Thus, in order to stabilize the anatase phase at elevated temperatures, and to utilize UV and visible light for photocatalysis, chemical modifiers and dopants are generally employed for the modification of the photocatalytic Titanium dioxide nanomaterials with improved catalytic and photo catalytic properties through codoping with copper and fluorine are synthesized and contain optimal textural and compositional properties, which are not possible without doping or with a single doping of Cu or F separately. The codoped systems promote the generation of a synergistic effect increasing activity of the systems in photocatalytic processes of both potential environmental or energy interest. The photocatalysts show very effective degradations of industrial and emerging contaminants such as ciprofloxacin (80% degradation) and naproxen (72% degradation) using UV light (300 W) in short periods of up to 15 min. An ad...

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Section: Applications Of the Materials In Catalytic And Photocatalytic Processesmentioning

confidence: 99%

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Díaz-Sánchez

Murgu

Díaz-García

et al. 2021

Advanced Sustainable Systems

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“…Accordingly, various methods and procedures of its modification have been proposed, including surface modification, [4][5][6] doping, 7-9 coupling [10][11][12] and morphology architecture. [13][14][15] For example, modification with noble metals (NMs) results in double action, i.e., an activity enhancement under UV (NM working as an electron scavenger) [16][17][18] and vis response due to plasmonic properties. [19][20][21][22][23] Accordingly, NM-modified semiconductors with activity under vis irradiation, known as plasmonic photocatalysts, have been of great interest recently.…”

Section: Introductionmentioning

confidence: 99%

The property-governed activity of silver-modified titania photocatalysts: The influence of titania matrix

Yoshiiri

Karabiyik

Wang

et al. 2022

The Journal of Chemical Physics

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Commercial titania photocatalysts were modified with silver nanoparticles (NPs) by photodeposition method in the presence/absence of methanol. The obtained photocatalysts were characterized by XRD, XPS, DRS, STEM and time-resolved microwave conductivity (TRMC) methods. The photocatalytic activity was tested under UV/vis irradiation for: (i) methanol dehydrogenation (during silver deposition), (ii) oxygen evolution with in-situ silver deposition, and (iii) oxidative decomposition of acetic acid, as well as under vis irradiation for 2-propanol oxidation. The action spectra of 2-propanol oxidation were also performed. It has been confirmed that modification of titania with silver causes significant improvement of photocatalytic activity under both UV and vis irradiation as silver works as an electron scavenger (TRMC data) and vis activator (possibly by an energy transfer mechanism). The obtained activities differ between titania samples significantly, suggesting that the type of crystalline phase, particle/crystallite sizes, and electron traps' density are crucial for both the properties of formed silver deposits and resultant photocatalytic activity. It might be concluded that under UV irradiation: high crystallinity and large specific surface area are recommended for rutile- and anatase-rich samples, respectively, during hydrogen evolution; mixed crystalline phases cause high rate of oxygen evolution from water; and anatase phase with fine silver NPs results in efficient decomposition of acetic acid, whereas under vis irradiation aggregated silver NPs (broad LSPR peak) on the rutile phase are promising for oxidation reactions.

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“…The comparison between 0D and 1D plasmonic photocatalysts have been performed by Wei et al for OAP (faceted anatase titania) and titanate nanowires (TNWs; precursor used for OAP synthesis) modified with NPs of Au, Ag, and Pt [116]. It has been confirmed that the modifications with noble metals have improved the photocatalytic performance of both semiconductors significantly under UV and vis irradiation.…”

Section: One-dimensional Plasmonic Photocatalystsmentioning

confidence: 98%

Morphology-Governed Performance of Plasmonic Photocatalysts

et al. 2020

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Plasmonic photocatalysts have been extensively studied for the past decade as a possible solution to energy crisis and environmental problems. Although various reports on plasmonic photocatalysts have been published, including synthesis methods, applications, and mechanism clarifications, the quantum yields of photochemical reactions are usually too low for commercialization. Accordingly, it has been proposed that preparation of plasmonic photocatalysts with efficient light harvesting and inhibition of charge carriers’ recombination might result in improvement of photocatalytic activity. Among various strategies, nano-architecture of plasmonic photocatalysts seems to be one of the best strategies, including the design of properties for both semiconductor and noble-metal-deposits, as well as the interactions between them. For example, faceted nanoparticles, nanotubes, aerogels, and super-nano structures of semiconductors have shown the improvement of photocatalytic activity and stability. Moreover, the selective deposition of noble metals on some parts of semiconductor nanostructures (e.g., specific facets, basal or lateral surfaces) results in an activity increase. Additionally, mono-, bi-, and ternary-metal-modifications have been proposed as the other ways of performance improvement. However, in some cases, the interactions between different noble metals might cause unwanted charge carriers’ recombination. Accordingly, this review discusses the recent strategies on the improvements of the photocatalytic performance of plasmonic photocatalysts.

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Influence of Semiconductor Morphology on Photocatalytic Activity of Plasmonic Photocatalysts: Titanate Nanowires and Octahedral Anatase Nanoparticles

Cited by 19 publications

References 103 publications

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

Synergistic Effect of Cu,F‐Codoping of Titanium Dioxide for Multifunctional Catalytic and Photocatalytic Studies

The property-governed activity of silver-modified titania photocatalysts: The influence of titania matrix

Morphology-Governed Performance of Plasmonic Photocatalysts

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