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https://www.readbyqxmd.com/read/28351010/vanadium-sulfide-sub-microspheres-a-new-near-infrared-driven-photocatalyst
#1
Yanli Zhou, Pengfei Liu, Fuyi Jiang, Jian Tian, Hongzhi Cui, Jian Yang
Recently, finding a novel near-infrared (NIR) photocatalyst has been the focus in photocatalysis. Here, VS4 sub-microspheres with a chain-like structure were prepared via a facile solvothermal method. As a new photocatalyst, it presents excellent NIR photocatalytic and photoelectrochemical (PEC) activity. Theoretical calculations and experimental results demonstrate that the improved NIR photocatalytic property originated from the narrow band gap of VS4, which significantly improves the NIR light absorption...
March 21, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28346716/vinylpyridines-as-building-blocks-for-the-photocatalyzed-synthesis-of-alkylpyridines
#2
Luca Capaldo, Maurizio Fagnoni, Davide Ravelli
The photocatalyzed addition of several hydrogen donors (ethers, aldehydes, alkanes, amides) onto vinylpyridines has been achieved. This approach gave access to alkylpyridines, important building blocks for the preparation of compounds having biological activity. The strategy is very simple and straightforward, since it requires only a small amount of a cheap decatungstate salt as the photocatalyst. As an added value, the reaction can be carried out under sunlight irradiation, as well as under flow conditions...
March 27, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28345143/direct-c-h-phosphonylation-of-electron-rich-arenes-and-heteroarenes-by-visible-light-photoredox-catalysis
#3
Rizwan Shaikh, Indrajit Ghosh, Burkhard König
The direct transformation of ubiquitous, but chemically inert C-H bonds into diverse functional groups is an important strategy in organic synthesis that improves the atom economy and allows preparing and modifying complex molecules more easily. . In contrast to the wide applications of aryl phosphonates, their synthesis via direct C-H bond phosphonylation is a less explored area. We report here a general, mild, and broadly applicable visible light photoredox C-H bond phosphonylation method for electron rich arenes and heteroarenes...
March 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28345100/visible-light-induced-heterogeneous-meerwein-ponndorf-verley-type-reduction-of-an-aldehyde-group-over-an-organically-modified-titanium-dioxide-photocatalyst
#4
Makoto Fukui, Atsuhiro Tanaka, Keiji Hashimoto, Hiroshi Kominami
An organically modified titanium dioxide photocatalyst prepared by a simple impregnation method chemoselectively and almost quantitatively converted benzaldehydes having other reducible functional groups to the corresponding benzyl alcohols under visible light irradiation.
March 27, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28343050/photocatalytic-efficiency-of-fe2o3-tio2-for-the-degradation-of-typical-dyes-in-textile-industries-effects-of-calcination-temperature-and-uv-assisted-thermal-synthesis
#5
Mohsen Nasirian, Ciro Fernando Bustillo-Lecompte, Mehrab Mehrvar
The inadequate management practices in industrial textile effluents have a considerable negative impact on the environment and human health due to the indiscriminate release of dyes. Photocatalysis is one of the diverse advance oxidation processes (AOPs) and titanium dioxide (TiO2) is recognized for its high oxidation and reduction power. A composite photocatalyst of Fe2O3/TiO2 is synthesized using different mass ratios of Fe:TiO2 to improve its photoactivity. The composite photocatalyst is calcined at 300-900 °C...
March 23, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28342756/photocatalytic-and-antimicrobial-activities-of-chitosan-tio2-nanocomposite
#6
K T Karthikeyan, A Nithya, K Jothivenkatachalam
Chitosan, a natural polysaccharide widely used for various biological applications due to their potential benefits. Incorporation of biomaterials with semiconductor has been exploited for waste water treatment and biological applications due to their nanometric sizes and biocompatibility of chitosan. Chitosan-Titanium dioxide (CS-TiO2) nanocomposite was synthesized and their optical, structural, spectral, thermal, morphological and elemental analyses were carried out by several techniques. The particle size of the synthesized CS-TiO2 nanocomposite was around 90nm and has a crystalline structure with anatase phase of TiO2...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28340948/application-of-ultrasound-aided-method-for-the-synthesis-of-cds-incorporated-three-dimensional-tio2-photocatalysts-with-enhanced-performance
#7
Joon Yeob Lee, Wan-Kuen Jo
In this study, an ultrasound-aided hydrothermal-impregnation method was used to synthesize three-dimensional (3D) urchin-like CdS-TiO2 nanostructures (UCTs) with variable CdS content. The photocatalytic efficiencies (for degrading limonene and toluene vapor) of UCTs synthesized using the ultrasound-aided process were greater than those of UCTs fabricated without ultrasound treatment. In addition, the photocatalytic efficiencies of ultrasound-treated UCTs were greater than those of zero-dimensional ultrasound-treated CdS-TiO2 particles, which, in turn, were greater than those of untreated 3D TiO2...
March 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28339181/oxidative-polyoxometalates-modified-graphitic-carbon-nitride-for-visible-light-co2-reduction
#8
Jie Zhou, Weichao Chen, Chunyi Sun, Lu Han, Chao Qin, Mengmeng Chen, Xinlong Wang, Enbo Wang, Zhongmin Su
Developing a photocatalysis system for converting CO2 to valuable fuels or chemicals is a promising strategy to address global warming and fossil fuel consumption. Exploring photocatalysts with high-performance and low-cost has been two ultimate goals toward photoreduction of CO2. Herein, noble-metal-free polyoxometalates (Co4) with oxidative ability was first introduced into g-C3N4 resulted in inexpensive hybrid materials (Co4@g-C3N4) with staggered band alignment. The staggered composited materials show a higher activity of CO2 reduction than bare g-C3N4...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28336898/2d-transition-metal-dichalcogenides-and-graphene-based-ternary-composites-for-photocatalytic-hydrogen-evolution-and-pollutants-degradation
#9
REVIEW
Ying Chen, Hongqi Sun, Wenchao Peng
Photocatalysis have attracted great attention due to their useful applications for sustainable hydrogen evolution and pollutants degradation. Transition metal dichalcogenides (TMDs) such as MoS₂ and WS₂ have exhibited great potential as cocatalysts to increase the photo-activity of some semiconductors. By combination with graphene (GR), enhanced cocatalysts of TMD/GR hybrids could be synthesized. GR here can act as a conductive electron channel for the transport of the photogenerated electrons, while the TMDs nanosheets in the hybrids can collect electrons and act as active sites for photocatalytic reactions...
March 15, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336897/three-dimensional-bioi-biox-x-cl-or-br-nanohybrids-for-enhanced-visible-light-photocatalytic-activity
#10
Yazi Liu, Jian Xu, Liqiong Wang, Huayang Zhang, Ping Xu, Xiaoguang Duan, Hongqi Sun, Shaobin Wang
Three-dimensional flower-like BiOI/BiOX (X = Br or Cl) hybrids were synthesized via a facile one-pot solvothermal approach. With systematic characterizations by X-ray diffraction (XRD), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), the Brunauer-Emmett-Teller (BET)specific surface area, X-ray photoelectron spectroscopy (XPS), and the UV-Vis diffuse reflectance spectra (DRS), the BiOI/BiOCl composites showed a fluffy and porous 3-D architecture with a large specific surface area (SSA) and high capability for light absorption...
March 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336856/a-novel-heterostructure-of-bioi-nanosheets-anchored-onto-mwcnts-with-excellent-visible-light-photocatalytic-activity
#11
Shijie Li, Shiwei Hu, Kaibing Xu, Wei Jiang, Jianshe Liu, Zhaohui Wang
Developing efficient visible-light-driven (VLD) photocatalysts for environmental decontamination has drawn significant attention in recent years. Herein, we have reported a novel heterostructure of multiwalled carbon nanotubes (MWCNTs) coated with BiOI nanosheets as an efficient VLD photocatalyst, which was prepared via a simple solvothermal method. The morphology and structure were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (DRS), and specific surface area measurements...
January 23, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336854/enhanced-visible-light-photocatalytic-activity-of-zno-nanowires-doped-with-mn-2-and-co-2-ions
#12
Wei Li, Guojing Wang, Chienhua Chen, Jiecui Liao, Zhengcao Li
In this research, ZnO nanowires doped with Mn(2+) and Co(2+) ions were synthesized through a facile and inexpensive hydrothermal approach, in which Mn(2+) and Co(2+) ions successfully substituted Zn(2+) in the ZnO crystal lattice without changing the morphology and crystalline structure of ZnO. The atomic percentages of Mn and Co were 6.29% and 1.68%, respectively, in the doped ZnO nanowires. The photocatalytic results showed that Mn-doped and Co-doped ZnO nanowires both exhibited higher photocatalytic activities than undoped ZnO nanowires...
January 19, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336853/enhanced-photocatalytic-performance-under-visible-and-near-infrared-irradiation-of-cu1-8se-cu%C3%A2-se%C3%A2-composite-via-a-phase-junction
#13
Li-Na Qiao, Huan-Chun Wang, Yang Shen, Yuan-Hua Lin, Ce-Wen Nan
A novel Cu1.8Se/Cu₃Se₂ composite photocatalyst was prepared by the simple precipitation method. This composite possesses a wide photoabsorption until the range of near-infrared light, and exhibits significantly enhanced photocatalytic activity for methyl orange degradation under visible and near-infrared light irradiation compared with bare Cu1.8Se and Cu₃Se₂. The mechanism of this outstanding photocatalytic behavior can be explained by the calculated energy band positions. The efficient charge separation via a phase junction of Cu1...
January 18, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336843/synthesis-of-vertically-aligned-zinc-oxide-nanowires-and-their-application-as-a-photocatalyst
#14
Qiong Zhou, John Z Wen, Pei Zhao, William A Anderson
Vertically aligned zinc oxide (ZnO) nanowires were hydrothermally synthesized on a glass substrate with the assistance of a pre-coated ZnO seeding layer. The crystalline structure, morphology and transmission spectrum of the as-synthesized sample were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and ultraviolet-visible (UV-Vis) spectrophotometry, respectively, indicating a wurzite ZnO material of approximately 100 nm wire diameter and absorbance at 425 nm and lower wavelengths...
January 11, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336836/visible-light-responsive-platinum-containing-titania-nanoparticle-mediated-photocatalysis-induces-nucleotide-insertion-deletion-and-substitution-mutations
#15
Der-Shan Sun, Yao-Hsuan Tseng, Wen-Shiang Wu, Ming-Show Wong, Hsin-Hou Chang
Conventional photocatalysts are primarily stimulated using ultraviolet (UV) light to elicit reactive oxygen species and have wide applications in environmental and energy fields, including self-cleaning surfaces and sterilization. Because UV illumination is hazardous to humans, visible light-responsive photocatalysts (VLRPs) were discovered and are now applied to increase photocatalysis. However, fundamental questions regarding the ability of VLRPs to trigger DNA mutations and the mutation types it elicits remain elusive...
December 28, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335365/antibacterial-properties-of-visible-light-responsive-carbon-containing-titanium-dioxide-photocatalytic-nanoparticles-against-anthrax
#16
Der-Shan Sun, Jyh-Hwa Kau, Hsin-Hsien Huang, Yao-Hsuan Tseng, Wen-Shiang Wu, Hsin-Hou Chang
The bactericidal activity of conventional titanium dioxide (TiO₂) photocatalyst is effective only on irradiation by ultraviolet light, which restricts the applications of TiO₂ for use in living environments. Recently, carbon-containing TiO₂ nanoparticles [TiO₂(C) NP] were found to be a visible-light-responsive photocatalyst (VLRP), which displayed significantly enhanced antibacterial properties under visible light illumination. However, whether TiO₂(C) NPs exert antibacterial properties against Bacillus anthracis remains elusive...
December 9, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335342/innovative-self-cleaning-and-biocompatible-polyester-textiles-nano-decorated-with-fe-n-doped-titanium-dioxide
#17
Ionela Cristina Nica, Miruna Silvia Stan, Anca Dinischiotu, Marcela Popa, Mariana Carmen Chifiriuc, Veronica Lazar, Gratiela G Pircalabioru, Eugenia Bezirtzoglou, Ovidiu G Iordache, Elena Varzaru, Iuliana Dumitrescu, Marcel Feder, Florin Vasiliu, Ionel Mercioniu, Lucian Diamandescu
The development of innovative technologies to modify natural textiles holds an important impact for medical applications, including the prevention of contamination with microorganisms, particularly in the hospital environment. In our study, Fe and N co-doped TiO₂ nanoparticles have been obtained via the hydrothermal route, at moderate temperature, followed by short thermal annealing at 400 °C. These particles were used to impregnate polyester (PES) materials which have been evaluated for their morphology, photocatalytic performance, antimicrobial activity against bacterial reference strains, and in vitro biocompatibility on human skin fibroblasts...
November 15, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335322/black-phosphorus-critical-review-and-potential-for-water-splitting-photocatalyst
#18
REVIEW
Tae Hyung Lee, Soo Young Kim, Ho Won Jang
A century after its first synthesis in 1914, black phosphorus has been attracting significant attention as a promising two-dimensional material in recent years due to its unique properties. Nowadays, with the development of its exfoliation method, there are extensive applications of black phosphorus in transistors, batteries and optoelectronics. Though, because of its hardship in mass production and stability problems, the potential of the black phosphorus in various fields is left unexplored. Here, we provide a comprehensive review of crystal structure, electronic, optical properties and synthesis of black phosphorus...
October 29, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335301/facile-synthesis-of-g-c%C3%A2-n%C3%A2-nanosheets-zno-nanocomposites-with-enhanced-photocatalytic-activity-in-reduction-of-aqueous-chromium-vi-under-visible-light
#19
Xiaoya Yuan, Chao Zhou, Qiuye Jing, Qi Tang, Yuanhua Mu, An-Ke Du
Graphitic-C₃N₄ nanosheets (CN)/ZnO photocatalysts (CN/ZnO) with different CN loadings were successfully prepared via a simple precipitation-calcination in the presence of exfoliated C₃N₄ nanosheets. Their morphology and structure were thoroughly characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL)...
September 14, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335221/mechanochemical-synthesis-of-tio%C3%A2-nanocomposites-as-photocatalysts-for-benzyl-alcohol-photo-oxidation
#20
Weiyi Ouyang, Ewelina Kuna, Alfonso Yepez, Alina M Balu, Antonio A Romero, Juan Carlos Colmenares, Rafael Luque
TiO₂ (anatase phase) has excellent photocatalytic performance and different methods have been reported to overcome its main limitation of high band gap energy. In this work, TiO₂-magnetically-separable nanocomposites (MAGSNC) photocatalysts with different TiO₂ loading were synthesized using a simple one-pot mechanochemical method. Photocatalysts were characterized by a number of techniques and their photocatalytic activity was tested in the selective oxidation of benzyl alcohol to benzaldehyde. Extension of light absorption into the visible region was achieved upon titania incorporation...
May 18, 2016: Nanomaterials
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