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https://www.readbyqxmd.com/read/28448832/fabrication-of-a-novel-z-scheme-g-c3n4-bi4o7-heterojunction-photocatalyst-with-enhanced-visible-light-driven-activity-toward-organic-pollutants
#1
Meng Sun, Yu Wang, Yu Shao, Yunhui He, Qi Zeng, Huikai Liang, Tao Yan, Bin Du
In this work, highly efficient g-C3N4/Bi4O7 heterojunction photocatalysts have been successfully fabricated by a facile method. Compared with the bare photocatalysts, the obtained g-C3N4/Bi4O7 hybrid photocatalysts exhibited efficient degradation activity toward methylene blue (MB), phenol, rhodamine B (RhB), and bisphenol A (BPA) under visible light irradiation. The influences of different g-C3N4 contents on the photocatalytic efficiency of the hybrid photocatalysts have been investigated. The results revealed that the g-C3N4/Bi4O7 with g-C3N4 mass ratio of 30% exhibited the best photocatalytic activity...
April 19, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28447693/modulating-the-electronic-structure-of-lanthanum-manganite-by-ruthenium-doping-for-enhanced-photocatalytic-water-oxidation
#2
Anindya Sundar Patra, Gaurangi Gogoi, Ranjan Kumar Sahu, Mohammad Qureshi
To the best of our knowledge this is the first report in which ruthenium doped polycrystalline lanthanum manganite, LaMn1-xRuxO3 (x = 0.0-0.4), having high efficacy for oxygen production from water without the use of any sacrificial reagent or co-catalyst and as an efficient photocatalyst for dye degradation is reported. Ruthenium doping alters the crystal structure of the parent LaMnO3 (LMO) due to the induced chemical pressure of the larger Ru(4+) ion, which facilitates a bond angle of 180° in the Mn(3+)-O-Mn(4+) plane resulting in the easy extraction of a photo-generated charge carrier population leading to enhanced photocatalytic activity...
April 27, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28444937/soluble-inorganic-nanoparticle-constructed-porous-coordination-frameworks-as-homogenized-heterogeneous-photocatalysts-for-suzuki-coupling-reaction-under-near-infrared-light
#3
Baodui Wang, Yuting Luo, Yong Peng, Weisheng Liu, Fengjuan Chen
Self-assembly has emerged as a promising method to control the structure and properties of ensembles of inorganic nanoparticles (NPs) for exploiting their collective effects. However, the rational assembly of inorganic NPs into soluble porous architectures as homogenized heterogeneous catalyst has been less studied. Here, we show that inorganic NPs can be used for the assembly of soluble porous coordination frameworks (PCFs) by atom-scale interfacial coordination-driven assembly strategy. Given large pore size, high dispersity in solution, strong absorption in the near-infrared range (NIR), and a long living electron-hole pair, the obtained soluble framework can serve as a platform for homogenize heterogeneous photocatalysts, which exhibited excellent activity, high apparent quantum efficiency, and recyclability to catalyze the noble metal free Suzuki coupling reaction under NIR light at room temperature...
April 26, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28443909/effect-of-the-calcination-temperature-on-the-photocatalytic-efficiency-of-acidic-sol-gel-synthesized-tio2-nanoparticles-in-the-degradation-of-alprazolam
#4
Andreia Romeiro, Diana Freitas, M Emília Azenha, Moisés Canle, Hugh D Burrows
We report a comparative study on the photodegradation of the widely used benzodiazepine psychoactive drug alprazolam (8-chloro-1-methyl-6-phenyl-4H-[1,2,4]triazolo[4,3-a][1,4]benzodiazepine, ALP) using direct photolysis, and titanium dioxide photocatalyzed reaction. Titanium dioxide photocatalysts were prepared as nanoparticles by acidic sol-gel methods, calcined at two different temperatures, and their behavior compared with P25 (Degussa type) TiO2. Efficient photodegradation was observed in the photocatalytic process, with over 90% degradation after 90 minutes under optimized conditions...
April 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28441752/photocatalytic-and-adsorption-performances-of-faceted-cuprous-oxide-cu%C3%A2-o-particles-for-the-removal-of-methyl-orange-mo-from-aqueous-media
#5
Weng Chye Jeffrey Ho, Qiuling Tay, Huan Qi, Zhaohong Huang, Jiao Li, Zhong Chen
Particles of sub-micron size possess significant capacity to adsorb organic molecules from aqueous media. Semiconductor photocatalysts in particle form could potentially be utilized for dye removal through either physical adsorption or photo-induced chemical process. The photocatalytic and adsorption capabilities of Cu₂O particles with various exposed crystal facets have been studied through separate adsorption capacity test and photocatalytic degradation test. These crystals display unique cubic, octahedral, rhombic dodecahedral, and truncated polyhedral shapes due to specifically exposed crystal facet(s)...
April 23, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28441486/n-substituted-3-10h-acridones-as-visible-light-water-soluble-photocatalyst-aerobic-oxidative-hydroxylation-of-arylboronic-acids
#6
Hong-Yan Xie, Li-Shuai Han, Shan Huang, Xiantao Lei, Yong Cheng, Wenfeng Zhao, Hongbin Sun, Xiaoan Wen, Qing-Long Xu
We disclosed a novel water-soluble photocatalyst, that could promote aerobic oxidative hydroxylation of arylboronic acids to furnish phenols in excellent yields. This transformation uses visible-light irradiation under environment-friendly conditions, that is, water-soluble catalyst, metal-free, green oxidant, room temperature.
April 25, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28441470/al2o3-and-sio2-atomic-layer-deposition-layers-on-zno-photoanodes-and-degradation-mechanisms
#7
Qian Cheng, Manpuneet Kaur Benipal, Qianlang Liu, Xingye Wang, Peter A A Crozier, Candace K Chan, Robert J Nemanich
Strategies for protecting unstable semiconductors include the utilization of surface layers comprised of thin films deposited using atomic layer deposition (ALD). The protective layer is expected to: (1) be stable against reaction with photogenerated holes, (2) prevent direct contact of the unstable semiconductor with the electrolyte, and (3) prevent the migration of ions through the semiconductor/electrolyte interface, while still allowing photogenerated carriers to transport to the interface and participate in the desired redox reactions...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28441014/chemistry-inspired-adaptable-framework-structures
#8
Zhiguo Xia, Kenneth R Poeppelmeier
Adaptable crystalline frameworks are important in modern solid-state chemistry as they are able to accommodate a wide range of elements, oxidation states, and stoichiometries. Owing to this ability, such adaptable framework structures are emerging as the prototypes for technologically important advanced functional materials. In this Account, the idea of cosubstitution is explored as a useful "pairing" concept that can potentially lead to the creation of many new members of one particular framework structure...
April 25, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28440617/anchoring-tailored-low-index-faceted-biobr-nanoplates-onto-tio2-nanorods-to-enhance-the-stability-and-visible-light-driven-catalytic-activity
#9
Chao Xue, Tianxi Zhang, Shujiang Ding, Jinjia Wei, Guidong Yang
In this work, a fantastic one-dimensional (1D) BiOBr/TiO2 nanorods (NRs) heterojunction composite was rationally proposed and designed from the perspective of molecular and interface engineering. The fabricated intimately connected interfacial heterojunction between two-dimensional (2D) BiOBr nanoplates and 1D TiO2 NRs acts as the interfacial nano-channel to promote efficient interfacial charge migration and the separation of photogenerated electron-hole pairs. As a result, 1D BiOBr/TiO2 NRs heterojunctions exhibited outstanding visible-light photocatalytic activities and sustained cycling performance...
April 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28440056/counteracting-blueshift-optical-absorption-and-maximizing-photon-harvest-in-carbon-nitride-nanosheets-photocatalyst
#10
Mohammad Rahman, Kenneth Davey, Shi-Zhang Qiao
Blueshift of optical absorption and corresponding widening of the bandgap is a fundamental problem with 2D carbon nitride nanosheets (CNNS). An additional problem is low quantum yields (<9%) due to higher loss of absorbed photons. These problems impose a significant restriction to photocatalytic performance of CNNS. Therefore, the synthesis of narrow bandgap CNNS with high quantum efficiency is of pressing research importance. This contribution reports melem-derived narrow bandgap CNNS with a record-low bandgap of 2...
April 25, 2017: Small
https://www.readbyqxmd.com/read/28439592/one-pot-photoassisted-synthesis-in-situ-photocatalytic-testing-for-hydrogen-generation-and-the-mechanism-of-binary-nitrogen-and-copper-promoted-titanium-dioxide
#11
Sean Taylor, Mihir Mehta, Dmitri Barbash, Alexander Samokhvalov
For the sustainable production of hydrogen by photocatalysis, the use of renewable resources such as water, organic compounds from plant biomass and earth abundant metal promoters is desired. We herein describe the previously not reported "one-pot" photoassisted synthesis of a binary metal-nitrogen promoted Cu(0)-N-TiO2 photocatalyst from a N-TiO2 precursor by photodeposition of copper directly in the photocatalytic suspension. The N-TiO2 contains nanocrystalline anatase as found by XRD and Raman spectroscopy...
April 25, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28439084/preparation-of-heterostructured-wo3-tio2-catalysts-from-wood-fibers-and-its-versatile-photodegradation-abilities
#12
Likun Gao, Wentao Gan, Zhe Qiu, Xianxu Zhan, Tiangang Qiang, Jian Li
A facile route was adopted to synthesize heterostructured WO3/TiO2 photocatalysts from wood fibers through a two-steps hydrothermal method and a calcination process. The prepared WO3/TiO2-wood fibers were used as photocatalysts under UV irradiation for photodegradation of rhodamine B, methylene blue and methyl orange. In calcination process, the wood fibers acted as carbon substrates to prepare the WO3/TiO2 photocatalysts with high surface area and unique morphology. Thus, the significant enhanced photodegradation efficiency of the organic pollutants with the WO3/TiO2-wood fibers under UV irradiation was obtained...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28437746/catalytic-reduction-of-4-nitrophenol-and-photo-inhibition-of-pseudomonas-aeruginosa-using-gold-nanoparticles-as-photocatalyst
#13
Shafiullah Khan, Wang Runguo, Kamran Tahir, Zhang Jichuan, Liqun Zhang
A simple, green method is described for the synthesis of Gold (Au) nanoparticles (NPs) using Cotoneaster horizontalis extract as a phyto-reducer and capping agent with superior photo inhibition activity against Pseudomonas aeruginosa. Different from the other methods used elevated temperatures for nanoparticles synthesis, the novelty of our method lies in its energy saving process and fast synthesis rates (~5min for AuNPs), and its potential to tune the nanoparticles size and afterward their catalytic activity...
April 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28437744/fe-%C3%A2-ions-enhanced-catalytic-properties-of-bio-2co3-nanowires-and-mechanism-study-for-complete-degradation-of-xanthate
#14
Yujiao Guo, Kuixin Cui, Mingyi Hu, Shengming Jin
The wire-like Fe(3+)-doped (BiO)2CO3 photocatalyst was synthesized by a hydrothermal method. The photocatalytic property of Fe(3+)-doped (BiO)2CO3 nanowires was evaluated through degradation of sodium isopropyl xanthate under UV-visible light irradiation. The as-prepared Fe(3+)-doped (BiO)2CO3 nanowires were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV-visible diffuse reflectance spectroscopy (UV-vis DRS), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) in detail...
April 17, 2017: Chemosphere
https://www.readbyqxmd.com/read/28437118/blue-light-photocatalytic-glycosylation-without-electrophilic-additives
#15
Peng Wen, David Crich
Photocatalytic formation of glycosidic bonds employing stable and readily accessible O-glycosyl derivatives of 2,2,6,6-tetramethylpiperidin-1-ol is presented that employs an iridium-based photocatalyst and blue LEDs. The reaction proceeds at room temperature and in the absence of additives other than 4 Å molecular sieves. Stereoselectivities are modest but nevertheless dependent on the anomeric configuration of the donor, suggesting a substantial degree of concerted character.
April 24, 2017: Organic Letters
https://www.readbyqxmd.com/read/28436525/graphitic-c3n4-nanosheets-synergistic-effects-of-hydrogenation-and-n-n-junctions-for-enhanced-photocatalytic-activities
#16
Minjie Zhou, Zhaohui Hou, Xiaobo Chen
The increasing concern about environmental pollution and fossil fuel energies have urged researchers to seek renewable energy sources and methods for pollutant decomposition. Photocatalysis seems to be one of the most promising approaches, which uses natural sunlight to produce hydrogen from water and removes organic pollutants from the environment. Among the various photocatalysts, graphitic carbon nitride (g-C3N4) has recently attracted much attention as a metal-free photocatalyst; however, it did not give a satisfactory performance...
April 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28436511/self-template-synthesis-of-cds-nisx-heterostructured-nanohybrids-for-efficient-photocatalytic-hydrogen-evolution
#17
You Xu, Wenguang Tu, Shengming Yin, Markus Kraft, Qichun Zhang, Rong Xu
Photocatalytic hydrogen (H2) evolution from water splitting is attracting enormous interest due to the possibility of converting solar energy into green chemical energy. The construction of highly efficient and stable photocatalysts is of importance and necessary for the development of photocatalytic water splitting technology. In this study, we have developed a self-template synthetic strategy for the preparation of heterostructured nanohybrids composed of ultrasmall CdS and NiSx nanoparticles by using Cd(ii)-Ni(ii)-(4,4'-bipyridine) coordination polymers as the precursor and template...
April 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28436507/enhanced-photogenerated-carrier-separation-in-cds-quantum-dot-sensitized-znfe2o4-znin2s4-nanosheet-stereoscopic-films-for-exceptional-visible-light-photocatalytic-h2-evolution-performance
#18
Yajie Chen, Guohui Tian, Wei Zhou, Yuting Xiao, Jinge Wang, Xin Zhang, Honggang Fu
CdS quantum dot sensitized ZnFe2O4/ZnIn2S4 nanosheet stereoscopic films were synthesized through two sequential solvothermal processes and the ionic layer adsorption-reaction method. The hydrophilic ZnIn2S4 nanosheet stereoscopic film was pre-prepared to act as a suitable host material, and then ZnFe2O4 nanoparticles and CdS quantum dots were uniformly decorated on the surface of the ZnIn2S4 nanosheet stereoscopic film to form a ternary heterostructure stereoscopic film. The band structure difference in the ternary heterostructure can promote the spatial separation and transport efficiency of photogenerated charge carriers...
April 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28432971/voids-padding-induced-further-enhancement-in-photocatalytic-performance-of-porous-graphene-like-carbon-nitride
#19
Guohui Dong, Dong Chen, Jianmin Luo, Yunqing Zhu, Yubin Zeng, Chuanyi Wang
Design of 2-Dimensional nanostructured photocatalyst is an effective way to improve the photocatalytic activity of its bulk counterpart. However, the remaining (or newborn) drawbacks, such as enlarged band gap and the surface recombination of photogenerated charge carries, extremely limited the practical application of nanosheeted photocatalysts in solar energy conversion. In this study, we demonstrated that the voids padding with NH4Cl can eliminate part of quantum size effect to reduce the band gap of nanosheeted carbon nitride...
April 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28429934/bi4tao8cl-nano-photocatalyst-influence-of-local-average-and-band-structure
#20
Swetha S M Bhat, Diptikanta Swain, Mikhail Feygenson, Joerg C Neuefeind, Abhishek K Mishra, Janardhan L Hodala, Chandrabhas Narayana, Ganapati V Shanbhag, Nalini G Sundaram
The average structure, local structure, and band structure of nanoparticles of photocatalyst Bi4TaO8Cl, an Aurivillius-Sillen layered material, has been studied by powder neutron Rietveld refinement, neutron pair distribution function technique, Raman scattering, and density functional theory calculations. A significant local structural deviation of nano-Bi4TaO8Cl was established in contrast to the local structure of bulk-Bi4TaO8Cl. Local structure was further supported by Raman scattering measurements. Through DFT calculations, we identify specific features in the electronic band structure that correlate lower secondary structural distortions in nano-Bi4TaO8Cl...
April 21, 2017: Inorganic Chemistry
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