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https://www.readbyqxmd.com/read/28813158/continuous-flow-synthesis-of-morpholines-and-oxazepanes-with-silicon-amine-protocol-slap-reagents-and-lewis-acid-facilitated-photoredox-catalysis
#1
Moritz K Jackl, Luca Legnani, Bill Morandi, Jeffrey W Bode
Photocatalytic coupling of aldehydes and silicon amine protocol (SLAP) reagents enables the simple, scalable synthesis of substituted morpholines, oxazepanes, thiomorpholines, and thiazepanes under continuous flow conditions. Key to the success of this process is the combination of an inexpensive organic photocatalyst (TPP) and a Lewis acid additive, which form an amine radical cation that is easily reduced to complete the catalytic cycle. Di- and trisubstituted SLAP reagents are formed in one step by an iron-catalyzed aminoetherification of olefins...
August 16, 2017: Organic Letters
https://www.readbyqxmd.com/read/28813031/pt-co-alloys-loaded-cubic-sic-electrode-with-improved-photoelectrocatalysis-property
#2
Dan Liu, Tao Yang, Junhong Chen, Kuo-Chih Chou, Xinmei Hou
A novel composite photocatalyst was synthesized by loading 5 wt % of platinum cobalt alloy on 3C-SiC nanowires and powder (Pt-Co-SiC) respectively via a simple polyol reduction method. Pt-Co-SiC were comprehensively characterized by SEM, HRTEM, XRD, PL, and XPS. The results indicated that Pt-Co nanoparticles in the size of 2-5 nm were dispersed homogeneously in the SiC nanowires and powders. The photocurrent response of the Pt-Co-SiC increased remarkably with increasing Pt content and the best performance was observed with the sample of Pt₃Co-SiC...
August 16, 2017: Materials
https://www.readbyqxmd.com/read/28812195/design-and-evaluation-of-a-compact-photocatalytic-reactor-for-water-treatment
#3
Marko Kete, Olena Pliekhova, Lev Matoh, Urška Lavrenčič Štangar
A compact reactor for photocatalytic oxidation and photocatalytic ozonation water treatment was developed and evaluated by using four model pollutants. Additionally, combinations of pollutants were evaluated. Specially produced Al2O3 porous reticulated monolith foams served as TiO2 carriers, offering a high surface area support. UV lamps were placed in the interior to achieve reduced dimensions of the reactor (12 cm in diameter × 20 cm in height). Despite its small size, the overall photocatalytic cleaning capacity was substantial...
August 15, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28810208/tungsten-doped-tio2-reduced-graphene-oxide-nano-composite-photocatalyst-for-degradation-of-phenol-a-system-to-reduce-surface%C3%A2-and-bulk-electron-hole-recombination
#4
Manisha Yadav, Asha Yadav, Rohan Fernandes, Yaksh Popat, Michele Orlandi, Alpa Dashora, D C Kothari, Antonio Miotello, B L Ahuja, Nainesh Patel
Recombination of photogenerated charges is the main factor affecting the photocatalytic activity of TiO2. Here, we report a combined strategy of suppressing both the bulk as well as the surface recombination processes by doping TiO2 with tungsten and forming a nanocomposite with reduced graphene oxide (rGO), respectively. Sol-gel method was used to dope and optimize the concentration of W in TiO2 powder. UV-Vis, XPS, PL and time resolved PL spectra along with DFT calculations indicate that W(6+) in TiO2 lattice creates an impurity level just below the conduction band of TiO2 to act as a trapping site of electrons, which causes to improve the lifetime of the photo-generated charges...
August 12, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28809983/controllable-synthesis-of-inorganic-organic-zn1-xcdxs-deta-solid-solution-nanoflowers-and-their-enhanced-visible-light-photocatalytic-hydrogen-production-performance
#5
Jiali Lv, Jinfeng Zhang, Kai Dai, Changhao Liang, Guangping Zhu, Zhongliao Wang, Zhen Li
Sustainable photocatalytic hydrogen evolution (PHE) of water splitting has been utilized to solve the serious environmental pollution and energy shortage problems over the last decade. Inorganic-organic hybrid materials could combine the organic molecules and functional inorganic blocks into unique materials through complicated physical and chemical interactions. In this paper, diethylenetriamine (DETA) was used as an organic molecule template for the synthesis of inorganic-organic Zn1-xCdxS-DETA solid solution nanoflowers (NFs) at very low temperature...
August 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28809971/construction-of-a-superior-visible-light-driven-photocatalyst-based-on-a-c3n4-active-centre-photoelectron-shift-platform-electron-withdrawing-unit-triadic-structure-covalent-organic-framework
#6
Sijing He, Qinfeng Rong, Hongyun Niu, Yaqi Cai
Herein, three functional factors inducing photocatalytic ability were artfully integrated into a covalent organic framework (COF), where triazine units served as photoactive centers, cyclic ketone units served as electron-withdrawing moieties, and the conjugated structure served as a photoelectron shift platform. This COF with segregated donor-acceptor alignments exhibits an excellent visible-light photocatalytic capacity for the decomposition of organic pollutants.
August 15, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28809160/w-n-tio2-with-positive-enough-level-of-valence-band-maximum-and-narrowing-bandgap-for-selective-aerobic-oxidation-in-visible-light-irradiation
#7
Mingming Zou, Lu Feng, Zhang Bingxue, Xinxin Zhou, Minghui Yang
A kind of surface complex (Triethylamine and mesoporous W-N-TiO2 microspheres with large surface area: 117.5 m2g-1) catalysis were achieved via visible-light photoredox catalysis. Triethylamine behaves as a true redox mediator due to donating ability seems to be highly favorable. With lower bandgap (2.43 eV) and more positive level of VBM (2.905 V), W-N-TiO2 sample has ability to play active catalytic role yielding excellent conversion of the selective oxidation of thioanisole (75.16 %) within 12 h visible light irradiation...
August 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28809077/donor-acceptor-complex-enables-alkoxyl-radical-generation-for-metal-free-c-sp3-c-sp3-cleavage-and-allylation-alkenylation
#8
Jing Zhang, Yang Li, Ruoyu Xu, Yiyun Chen
The alkoxyl radical is an essential and prevalent reactive intermediate for chemical and biological studies. Here we report the first donor-acceptor complex-enabled alkoxyl radical generation under metal-free reaction conditions induced by visible light. Hantzsch ester forms the key donor-acceptor complex with N-alkoxyl derivatives, which is elucidated by a series of spectrometry and mechanistic experiments. Selective C(sp3)-C(sp3) bond cleavage and allylation/alkenylation is demonstrated for the first time using this photocatalyst-free approach with linear primary, secondary, and tertiary alkoxyl radicals...
August 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28806560/tio2-porous-adsorbents-recent-advances-and-novel-applications
#9
REVIEW
Shayan MiarAlipour, Donia Friedmann, Jason Scott, Rose Amal
This article reviews two interrelated areas of research: the first is the use of TiO2-supported adsorbent materials as enhanced heterogeneous photocatalysts and their application to various reactions for organic pollutant removal from air and water; the second is the combination of adsorbent materials with TiO2 photocatalysts which aims to efficiently regenerate adsorbent materials using illumination. By reviewing both areas of research, the following topics are covered; (i) photocatalytic activation of TiO2; (ii) related properties of photocatalytic TiO2; (iii) shortcomings of photocatalytic processes; (iv) preparation methods of composite TiO2/adsorbent materials and their photocatalytic performance; (v) properties of common adsorbents and their applications for pollutant removal from air and water; (vi) adsorbent regeneration methods and their economic and operational issues; (vii) conclusions and future outlooks...
August 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28805864/novel-synthesis-of-magnetic-porous-c-znfe2o4-photocatalyst-with-enhanced-activity-under-visible-light-based-on-the-fenton-like-reaction
#10
Fangxiao Wang, Yanglin Chen, Rongshu Zhu, Jianmin Sun
Magnetic visible-light-driven photocatalyst, porous C/ZnFe2O4 (denoted as C/ZFO-CE) was fabricated via a CO2-mediated ethanol route. CO2-mediated ethanol route largely mitigated the solvent strength and facilitated the homogenous deposition of ZnFe2O4 (ZFO) through the coordination of metallic cation with CO3(2-) and HCO3(-) anions, which were hydrolyzed from CO2 and H2O, thereby avoiding additional precipitant. Moreover, the HCO3(-), CO3(2-) and NO3(-) in the system acted as templates for the formation of porous C avoiding the additional organic mesoporous templates, thus reducing the synthesis cost...
August 14, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28805658/nanofibrous-photocatalysts-from-electrospun-nanocapsules
#11
Shuai Jiang, Ingo Lieberwirth, Katharina Landfester, Rafael Munoz-Espi, Daniel Crespy
We present the design of multicompartment metal oxide/silica nanofibrous photocatalysts by colloid-electrospinning and subsequent calcination. During the calcination process, silica nanomaterials are cemented to form the fibrous framework and metal oxide precursors are crystallized inside and onto the fibers. This multicompartment nanofibrous structure, constructed with nanoparticles and core-shell nanocapsules, is therefore beneficial for the separation of the materials and the light utilization due to the multiple reflections and scattering of incident light in the cavities...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28805276/visible-light-mediated-selective-arylation-of-cysteine-in-batch-and-flow
#12
Cecilia Bottecchia, Maarten Rubens, Smita Gunnoo, Volker Hessel, Annemieke Madder, Timothy Noel
A mild visible light-mediated strategy for cysteine arylation is presented. The method relies on the use of Eosin Y as a metal-free photocatalyst and aryldiazonium salts as arylating agents. The reaction can be significantly accelerated in a microflow reactor, whilst allowing the in situ formation of the required diazonium salts. The batch and flow protocol described herein can be applied to obtain a broad series of arylated cysteine derivatives and arylated cysteine-containing dipeptides. Moreover, the method was applied to the chemoselective arylation of a model peptide in biocompatible reaction conditions (room temperature, PBS buffer) within a short reaction time...
August 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28803026/novel-mesoporous-graphitic-carbon-nitride-modified-pbbio2br-porous-microspheres-with-enhanced-photocatalytic-performance
#13
Bin Wang, Jun Di, Gaopeng Liu, Sheng Yin, Jiexiang Xia, Qi Zhang, Huaming Li
Sustainable mesoporous graphitic carbon nitride (mpg-C3N4) modified PbBiO2Br porous microsphere (mpg-C3N4/PbBiO2Br) had been successfully synthesized via solvothermal process. Multiple techniques were applied to explore the structure, morphology, optical and electronic properties of the as-prepared photocatalysts. It could be found that the mpg-C3N4 was uniformly distributed on the surface of the PbBiO2Br porous microsphere. Compared with the pure PbBiO2Br, the mpg-C3N4/PbBiO2Br exhibited superior photocatalytic activity for the degradation of organic pollutants under visible light irradiation...
July 27, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28802257/oxidation-of-alkyl-benzenes-by-a-flavin-photooxidation-catalyst-on-nanostructured-metal-oxide-films
#14
Prateek Dongare, Ian MacKenzie, Degao Wang, David A Nicewicz, Thomas J Meyer
We describe here a surface-bound, oxide-based procedure for the photooxidation of a family of aromatic hydrocarbons by a phosphate-bearing flavin mononucleotide (FMN) photocatalyst on high surface area metal-oxide films.
August 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28802173/fungicidal-activity-of-copper-sputtered-flexible-surfaces-under-dark-and-actinic-light-against-azole-resistant-candida-albicans-and-candida-glabrata
#15
Myriam K S Ballo, Sami Rtimi, John Kiwi, César Pulgarin, José M Entenza, Alain Bizzini
Candida spp. are able to survive on hospital surfaces and causes healthcare-associated infections (HCAIs). Since surface cleaning and disinfecting interventions are not totally effective to eliminate Candida spp., new approaches should be devised. Copper (Cu) has widely recognized antifungal activity and the use of Cu-sputtered surfaces has recently been proposed to curb the spread of HCAIs. Moreover, the activity of Cu under the action of actinic light remains underexplored. We investigated the antifungal activity of Cu-sputtered polyester surfaces (Cu-PES) against azole-resistant Candida albicans and Candida glabrata under dark and low intensity visible light irradiation (4...
July 29, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28801934/self-co-catalyzed-fluorine-doped-hematite-nanocrystal-for-efficient-water-oxidation
#16
Yi Xie, Junfeng Xie, Weiwei Liu, Jianping Xin, Fengcai Lei, Li Gao, Haichao Qu, Xiaodong Zhang
Herein, enhanced light absorption and oxygen-evolving activity were simultaneously achieved by doping fluorine anions into hematite nanocrystals. With the merits of anion doping, the band structure of hematite can be effectively regulated, leading to the generation of defect level between the bandgap and remarkably increased visible light absorption. In addition, the activity for electrocatalytic oxygen evolution reaction (OER) of the hematite nanocrystals exhibits obvious enhancement after fluorine doping, making the doped hematite play as an effective self-co-catalyst for photoelectrochemical water splitting...
August 12, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28801660/bivo4-rgo-with-a-novel-structure-on-steel-fabric-used-as-high-performance-photocatalysts
#17
Dong Fang, Xiujuan Li, Hui Liu, Weilin Xu, Ming Jiang, Wenbin Li, Xin Fan
A high-performance and novel photocatalyst of BiVO4-reduced Graphene Oxide (BiVO4-rGO) nanocomposite was prepared by a facile hydrothermal method. The photocatalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electronic microscopy, UV-Vis diffusion reflectance spectroscopy, photoluminescence spectroscopy and UV-Vis adsorption spectroscopy, respectively. The visible-light photocatalytic activity was evaluated by oxidation of methyl orange (MO) under simulated sunlight irradiation...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28800215/c-fibers-wse2-nanoplates-core-shell-composite-highly-efficient-solar-driven-photocatalyst
#18
Hong Li, Zhijian Peng, Jingwen Qian, Meng Wang, Chengbiao Wang, Xiuli Fu
Recently, WSe2 as a typical transition metal dichalcogenide compound has attracted extensive attention due to its potential applications in electronic and optoelectronic devices. However, WSe2 alone cannot be directly used as photocatalyst, due to its inferior performance possibly caused by the strong recombination of photogenerated electron-hole pairs. Here a novel C fibers@WSe2 nanoplates core-shell composite (NPCSC) was successfully synthesized via facile, one-step thermal evaporation, in which numerous WSe2 thin nanoplates were in-situ, densely and even vertically grown on the surface of the C fibers...
August 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28799591/visible-light-induced-transition-metal-catalyzed-transformations-beyond-conventional-photosensitizers
#19
Marvin Parasram, Vladimir Gevorgyan
Employment of simple transition metal (TM = Co, Fe, Cu, Pd, Pt, Au)-based photocatalyst (PC) has led to the dramatic acceleration of known TM-catalyzed reactions, as well as to the discovery of unprecedented chemical transformations. Compared to the conventional cooperative/dual photocatalysis (type B), this new class of unconventional PCs operates via a single photoexcitation/catalytic cycle, where the TM complex plays a "double duty" role by harvesting light and catalyzing the chemical transformation. Also, these TM photocatalysts participate in the bond-forming/breaking event in the transformation via a substrate-TM interaction, an aspect that is uncommon for conventional photocatalysis (type A)...
August 11, 2017: Chemical Society Reviews
https://www.readbyqxmd.com/read/28799586/elucidating-the-impact-of-a-site-cation-change-on-photocatalytic-h2-and-o2-evolution-activities-of-perovskite-type-lntaon2-ln-la-and-pr
#20
Mirabbos Hojamberdiev, Maged F Bekheet, Judy N Hart, Junie Jhon M Vequizo, Akira Yamakata, Kunio Yubuta, Aleksander Gurlo, Masashi Hasegawa, Kazunari Domen, Katsuya Teshima
Transition metal (oxy)nitrides with perovskite-type structures have been regarded as one of the promising classes of inorganic semiconductor materials that can be used in solar water splitting systems for the production of hydrogen as a renewable and storable energy carrier. The performance of transition metal (oxy)nitrides in solar water splitting is strongly influenced by the crystal structure-related dynamics of photogenerated charge carriers. Here, we have systematically assessed the influence of A-site cation exchange on the visible-light-induced photocatalytic H2 and O2 evolution activities, photoanodic response, and dynamics of photogenerated charge carriers of perovskite-type LnTaON2 (Ln = La and Pr)...
August 11, 2017: Physical Chemistry Chemical Physics: PCCP
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