Design, modification and application of semiconductor photocatalysts

Wang, Lizhuo; Zhao, Jinhui; Liu, Huimin; Huang, Jun

doi:10.1016/j.jtice.2018.09.004

Cited by 115 publications

(49 citation statements)

References 113 publications

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“…Among the most used catalysts are titanium dioxide (TiO 2 ), cadmium sulfide (CdS), zinc oxide (ZnO), zinc sulphide (ZnS), tungsten trioxide (WO 3 ), tin dioxide (SnO 2 ) and iron oxide III (Fe 2 O 3 ) 6 . However, these catalysts generally present a low specific surface area and porosity, limiting intraparticle diffusion of organic pollutants, compromising its photocatalytic activity [7][8][9] .…”

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confidence: 99%

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Muraro

Mortari

Vizzotto

et al. 2020

Sci Rep

120

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nowadays, there is a growing concern about the environmental impacts of colored wastewater. thus, the present work aims the synthesis, characterization and determination of photocatalytic activity of iron oxide (fe 2 o 3) nanocatalyst, evaluating the effect of hybridization with titanium (TiNPs-Fe 2 o 3) and silver (AgNPs-Fe 2 o 3) nanoparticles, on the degradation of Rhodamine B dye (RhB). nanocatalysts were characterized by XRD, SeM, teM, ftiR, n 2 porosimetry (Bet/BJH method), zeta potential and DRS. photocatalytic tests were performed in a slurry reactor, with the nanocatalyst in suspension, using RhB as a target molecule, under ultraviolet (UV) and visible radiation. therefore, the photocatalytic activity of the nanocatalysts (non-doped and hybridized) was evaluated in these ideal conditions, where the AgNPs-Fe 2 o 3 sample showed the best photocatalytic activity with a degradation of 94.1% (k = 0.0222 min −1 , under UV) and 58.36% (k = 0.007 min −1 , under visible), while under the same conditions, the tio 2-P25 commercial catalyst showed a degradation of 61.5% (k = 0.0078 min −1) and 44.5% (k = 0.0044 min −1), respectively. According with the ideal conditions determined, reusability of the AgNPs-Fe 2 o 3 nanocatalyst was measured, showing a short reduction (about 8%) of its photocatalytic activity after 5 cycles. Thus, the Fe 2 o 3 nanocatalyst can be considered a promising catalyst in the heterogeneous photocatalysis for application in the degradation of organic dyes in aqueous solution.

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confidence: 99%

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Muraro

Mortari

Vizzotto

et al. 2020

Sci Rep

120

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“…Among these, 2D TMDs have appeared as fascinating candidates due to fact that the dimensional reduction from 3D to 2D in these materials leads to many interesting physical/chemical properties that are most suitable for photocatalysis of water . Some of these advantages are the creation of a large number of active surface sites, an ultrahigh fraction of under‐coordinated atomic sites, bandgap tunability, conversion of indirect to direct bandgap with size reduction, and the relative displacement of the valence band and conduction band positions with respect to normal hydrogen electrode (NHE) . The theoretical predictions and experimental observations put some 2D TMDs as more promising candidates for photocatalysis, this list includes MoSe 2 , MoS 2 , WS 2 , SnS 2 , ReS 2 , HfS 2 , TcSe 2, etc.…”

Section: Applications Of Mos2 For Energy Conversion and Storagementioning

confidence: 99%

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

Naik

Rabinal

2020

Energy Tech

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Molybdenum disulphide (MoS2), an ideal semiconductor, belongs to the group of 40 well‐identified transition metal dichalcogenides. These have unique chemical bonding; in an ideal case they do not feature dangling bonds and hence possess a layered‐like atomic structure, such that strong intraplane and weak interplane bondings exist. Hence, MoS2 can be peeled into a precisely controlled number of layers; the bulk with Eg = 1.2 eV can be reduced to a unit cell‐thick layer (monolayer) with Eg = 1.89 eV. However, in reality, both bulk and monolayers possess many types of atomic defects associated with in‐plane, edge, grain boundaries, etc. As a result, MoS2 exhibits many interesting and tunable optoelectronic properties suitable for a wide range of applications. Interestingly, its basic polyhedral form (MoS6) undergoes a structural change that leads to many polymorphic phases, the three in bulk and the five in monolayer. Theoretical predictions and experimental observations clearly confirm that MoS2 and its interfaces with other materials can be significantly important for energy conversion and storage applications, which are emerging and critically important topics of modern science and society. This Review provides an overview of the past few years of research and developments on these topics.

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“…As potential photocatalysts, semiconductor nanomaterials with large surface area have attracted great attention. 3,4 Among semiconductors, commercial titanium dioxide [TiO 2 or Degussa P25 (anatase: rutile, 70:30)], is a well-known and inexpensive photocatalyst with a band-gap of 3.2 eV. Although TiO 2 -P25 is highly able at performing photocatalytic reactions, it has two major restrictions: large band-gap and high recombination rate of the electron/hole pairs.…”

Section: Introductionmentioning

confidence: 99%

The first report of covalently grafted semiconductors; n‐TiO₂‐P25@ECH@WO₃ as a new, efficient, robust and visible‐light‐responsive photocatalyst

Bitaraf

Amoozadeh

2020

J of Chemical Tech & Biotech

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BACKGROUND Semiconductor nanomaterials have gained great attention as potential photocatalysts to promote environmentally benign organic reactions. Degussa P25, known as commercial TiO2, is the most applicable semiconductor photocatalyst. However, the wide band‐gap of TiO2 limits its application. A simple way to address this issue is to form heterojunction structures. RESULTS In the present work, n‐TiO2‐P25@ECH@WO3 heterostructure photocatalyst was synthesized for the first time by a two‐step covalent grafting strategy. In this photocatalyst, two nano‐semiconductors, TiO2‐P25 and WO3 were anchored with epichlorohydrin (ECH) as the covalent linker. The properties of n‐TiO2‐P25@ECH@WO3 were investigated through Fourier‐transform infrared spectroscopy (FTIR), X‐ray powder diffraction (XRD), transmission electron microscopy (TEM), energy dispersive X‐Ray (EDX) and UV‐visible/DRS techniques. Under blue LED light, n‐TiO2‐P25@ECH@WO3 oxidized benzyl alcohol to benzaldehyde with excellent selectivity and high yield. CONCLUSION In this study, n‐TiO2‐P25@ECH@WO3 heterostructure photocatalyst was successfully synthesized and evaluated. ECH as the organic linker stably grafted two nano‐semiconductors, n‐TiO2‐P25 and n‐WO3. The heterojunction that formed between n‐TiO2 and n‐WO3 significantly improved the light absorption performance with a considerable redshift to the visible region. Also, the photocatalyst showed an increased activity compared to individual semiconductors. © 2020 Society of Chemical Industry (SCI)

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Design, modification and application of semiconductor photocatalysts

Cited by 115 publications

References 113 publications

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

The first report of covalently grafted semiconductors; n‐TiO₂‐P25@ECH@WO₃ as a new, efficient, robust and visible‐light‐responsive photocatalyst

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Design, modification and application of semiconductor photocatalysts

Cited by 115 publications

References 113 publications

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Iron oxide nanocatalyst with titanium and silver nanoparticles: Synthesis, characterization and photocatalytic activity on the degradation of Rhodamine B dye

Molybdenum Disulphide Heterointerfaces as Potential Materials for Solar Cells, Energy Storage, and Hydrogen Evolution

The first report of covalently grafted semiconductors; n‐TiO2‐P25@ECH@WO3 as a new, efficient, robust and visible‐light‐responsive photocatalyst

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The first report of covalently grafted semiconductors; n‐TiO₂‐P25@ECH@WO₃ as a new, efficient, robust and visible‐light‐responsive photocatalyst