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https://www.readbyqxmd.com/read/28230969/anatase-101-like-structural-model-revealed-for-metastable-rutile-tio2-011-surface
#1
Meiling Xu, Sen Shao, Bo Gao, Jian Lv, Quan Li, Yanchao Wang, Hui Wang, Lijun Zhang, Yanming Ma
Titanium dioxide has been widely used as efficient transition metal oxide photocatalyst. However, its photocatalytic activity is limited to ultraviolet spectrum range due to the deficient large bandgap beyond 3 eV. Efforts towards to reduce the bandgap for achieving a broader spectrum range of light absorption are attempted with a success on the experimental synthesis of dopant-free metastable surface structure of rutile-type TiO2 (011) 21. This new surface phase possesses a much reduced bandgap of ~2.1 eV, showing a great potential for an excellent photocatalyst covering a wide range of visible light...
February 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28225131/modification-of-n-doped-tio2-photocatalysts-using-noble-metals-pt-pd-a-combined-xps-and-dft-study
#2
K Batalović, N Bundaleski, J Radaković, N Abazović, M Mitrić, R A Silva, M Savić, J Belošević-Čavor, Z Rakočević, C M Rangel
Nitrogen-doped TiO2 (N-TiO2) is considered as one of the most promising materials for various photocatalytic applications, while noble metals Pd and Pt are known as good catalysts for hydrogen evolution. This work focuses on the determination of structural and electronic modifications of N-TiO2, achieved by noble metal deposition at the surface, as a starting indicator for potential applications. We focus on the properties of easily synthesized nanocrystalline nitrogen-doped anatase TiO2, modified by depositing small amounts of Pd (0...
February 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28224986/mass-spectrometric-monitoring-of-interfacial-photoelectron-transfer-and-imaging-of-active-crystalline-facets-of-semiconductors
#3
Hongying Zhong, Juan Zhang, Xuemei Tang, Wenyang Zhang, Ruowei Jiang, Rui Li, Disong Chen, Peng Wang, Zhiwei Yuan
Monitoring of interfacial electron transfer (ET) in situ is important to understand the ET mechanism and designing efficient photocatalysts. We describe herein a mass spectrometric approach to investigate the ultrafast transfer of photoelectrons that are generated by ultraviolet irradiation on surfaces of semiconductor nanoparticles or crystalline facets. The mass spectrometric approach can not only untargetedly detect various intermediates but also monitor their reactivity through associative or dissociative photoelectron capture dissociation, as well as electron detachment dissociation of adsorbed molecules...
February 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28222304/fabrication-of-novel-visible-light-driven-agi-g-c3n4-composites-with-enhanced-visible-light-photocatalytic-activity-for-diclofenac-degradation
#4
Wei Zhang, Li Zhou, Jun Shi, Huiping Deng
A visible-light-driven heterostructured AgI/g-C3N4 was prepared by a deposition-precipitation method. The composition, structure, morphology, and optical properties of the photocatalyst were characterized by Brunauer-Emmett-Teller method (BET), X-ray powder diffraction (XRD), Fourier transform-infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), scanning electron microscope (SEM), UV-vis diffused reflectance spectroscopy (DRS), photoluminescence spectroscopy (PL), photocurrent, and electrochemical impedance spectroscopy (EIS), respectively...
February 14, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28221387/one-step-in-situ-synthesis-of-core-shell-structured-cr2o3-p-fibrous-phosphorus-hybrid-composites-with-highly-efficient-full-spectrum-response-photocatalytic-activities
#5
Hongpeng Zhou, Shixin Xu, Dingke Zhang, Shijian Chen, Junkai Deng
Making full use of solar energy and achieving high charge separation efficiency are critical factors for the photocatalysis technique. In this work, we report core-shell structured fibrous phosphorus (f-P) coated P-doped Cr2O3 (Cr2O3:P@f-P) hybrid composites with a strong optical absorption in the full region of 200-2600 nm. The Cr2O3:P@f-P hybrid composites exhibit a record photocatalytic efficiency under UV, visible and near-infrared light irradiation, demonstrating as promising photocatalysts for the full utilization of solar energy...
February 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28221381/enhanced-photocatalytic-activities-of-single-crystalline-znga2o4-nanoprisms-by-the-coexposed-111-and-110-facets
#6
Tingting Zheng, Yuguo Xia, Xiuling Jiao, Ting Wang, Dairong Chen
Facet-control has been a fascinating method for preparation of highly active photocatalysts. Herein, we report the hydrothermal preparation of single-crystalline ZnGa2O4 nanoprisms with the {111} and {110} facets coexposed. Studies of their photocatalytic performance have revealed that the as-formed nanoprisms exhibit significantly enhanced photocatalytic activities compared with ZnGa2O4 nanocubes with only the {100} facets exposed and nanosheets with the {110} facets exposed for H2 evolution and contaminant degradation...
February 21, 2017: Nanoscale
https://www.readbyqxmd.com/read/28220991/molten-ag2so4-based-ion-exchange-preparation-of-a-novel-ag0-5la0-5tio3-material-for-photocatalytic-o2-evolution
#7
Shichao Zong, Cheng Cheng, Jinwen Shi, Zhenxiong Huang, Yuchao Hu, Honghui Yang, Liejin Guo
A novel material, Ag0.5La0.5TiO3, with ABO3 perovskite structure was synthesized by a newly developed ion-exchange method. Molten Ag2SO4 instead of traditional molten AgNO3 was used as Ag+ source in view of high decomposition temperature (1052 oC) of Ag2SO4, thereby guaranteeing the complete substitution of Ag+ for Na+ in Na0.5La0.5TiO3 with stable ABO3 perovskite structure, in which it is difficult to exchange Na+ with Ag+, to obtain Ag0.5La0.5TiO3 at a high ion-exchange temperature (700 oC) above the melting temperature (652 oC) of Ag2SO4...
February 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28220969/heterojunction-photocatalysts
#8
REVIEW
Jingxiang Low, Jiaguo Yu, Mietek Jaroniec, Swelm Wageh, Ahmed A Al-Ghamdi
Semiconductor-based photocatalysis attracts wide attention because of its ability to directly utilize solar energy for production of solar fuels, such as hydrogen and hydrocarbon fuels and for degradation of various pollutants. However, the efficiency of photocatalytic reactions remains low due to the fast electron-hole recombination and low light utilization. Therefore, enormous efforts have been undertaken to solve these problems. Particularly, properly engineered heterojunction photocatalysts are shown to be able to possess higher photocatalytic activity because of spatial separation of photogenerated electron-hole pairs...
February 21, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28218472/a-redox-shuttle-accelerates-o2-evolution-of-photocatalysts-formed-in-situ-under-visible-light
#9
Jia-Xin Li, Chen Ye, Xu-Bing Li, Zhi-Jun Li, Xue-Wang Gao, Bin Chen, Chen-Ho Tung, Li-Zhu Wu
A redox shuttle strategy is demonstrated to be a promising approach to accelerate hole removal for efficient O2 production with mesoporous graphitic carbon nitride, WO3 , BiVO4 , NiTi-LDH, and Ag3 PO4 water-oxidation catalysts under visible-light irradiation.
February 20, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28214677/photo-degradation-of-basic-green-1-and-basic-red-46-dyes-in-their-binary-solution-by-la2o3-al2o3nanocomposite-using-first-order-derivative-spectra-and-experimental-design-methodology
#10
Bahareh Fahimirad, Alireza Asghari, Maryam Rajabi
In this work, the lanthanum oxide-aluminum oxide (La2O3-Al2O3) nanocomposite is introduced as an efficient photocatalyst for the photo-degradation of the dyes basic green 1 (BG1) and basic red 46 (BR46) in their binary aqueous solution under the UV light irradiation. The properties of this catalyst are determined by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET), and UV-visible spectrophotometry. The first-order derivative spectra are used for the simultaneous analysis of the dyes in their binary solution...
February 10, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28212485/efficient-upconverting-multiferroic-core-shell-photocatalysts-visible-to-near-infrared-photon-harvesting
#11
Jianming Zhang, Yue Huang, Lei Jin, Federico Rosei, Fiorenzo Vetrone, Jerome P Claverie
We report the two-step synthesis of a core@shell nanohybrid material for visible-to-near-infrared (NIR) photocatalysis. The core is constituted of NaGdF4:Er(3+), Yb(3+) upconverting nanoparticles (UCNPs). A bismuth ferrite (BFO) shell is assembled around the UCNPs via a hydrothermal process. The photocatalytic degradation assays of organic compounds of methylene orange and 4-chlorophenol reveal that core@shell nanostructures possess remarkably enhanced reaction activity under visible and NIR irradiation, compared to the BFO powder alone and the BFO-UCNP mixture...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211967/generation-of-the-scf3-radical-by-photoredox-catalysis-intra-and-intermolecular-carbotrifluoromethylthiolation-of-alkenes
#12
Guillaume Dagousset, Cédric Simon, Elsa Anselmi, Béatrice Tuccio, Thierry Billard, Emmanuel Magnier
We report herein the first use of N-trifluoromethylthiosaccharin as the source of SCF3 radical under photoredox catalysis. This allowed an efficient and general visible-light-mediated carbotrifluoromethylthiolation of alkenes. Under the optimized conditions using fac-Ir(ppy)3 as the photocatalyst, various N-aryl acrylamides as well as a wide range of substituted styrenes can readily be difunctionalized in an intra- or intermolecular fashion, affording the corresponding SCF3-containing products in good to excellent yield...
February 17, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28211366/l-cysteine-assisted-synthesis-of-hierarchical-nis2-hollow-spheres-supported-carbon-nitride-as-photocatalysts-with-enhanced-lifetime
#13
Chengzhang Zhu, Zhifeng Jiang, Linlin Chen, Kun Qian, Jimin Xie
Novel hierarchical NiS2 hollow spheres modified by graphite-like carbon nitride were prepared using a facile L-cysteine-assisted solvothermal route. The NiS2/g-C3N4 composites exhibited excellent photocatalytic efficiency in rhodamine B, methyl orange and ciprofloxacin degradation as compared to single g-C3N4 and NiS2, which could be due to the synergistic effects of the unique hollow sphere-like structure, strong visible-light absorption and increased separation rate of the photoinduced electron-hole pairs at the intimate interface of heterojunctions...
March 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28209894/catalytic-intermolecular-hydroaminations-of-unactivated-olefins-with-secondary-alkyl-amines
#14
Andrew J Musacchio, Brendan C Lainhart, Xin Zhang, Saeed G Naguib, Trevor C Sherwood, Robert R Knowles
The intermolecular hydroamination of unactivated alkenes with simple dialkyl amines remains an unsolved problem in organic synthesis. We report a catalytic protocol for efficient additions of cyclic and acyclic secondary alkyl amines to a wide range of alkyl olefins with complete anti-Markovnikov regioselectivity. In this process, carbon-nitrogen bond formation proceeds through a key aminium radical cation intermediate that is generated via electron transfer between an excited-state iridium photocatalyst and an amine substrate...
February 17, 2017: Science
https://www.readbyqxmd.com/read/28199743/novel-bi2-wo6-coupled-fe3-o4-magnetic-photocatalysts-preparation-characterization-and-photodegradation-of-tetracycline-hydrochloride
#15
Tianye Wang, Shuang Zhong, Shuang Zou, Fuhuan Jiang, Limin Feng, Xiaosi Su
Novel Bi2 WO6 coupled Fe3 O4 magnetic photocatalysts with excellent and stable photocatalytic activity for degrading tetracycline hydrochloride and RhB were successfully synthesized via a facile solvothermal route. Through the characterization of the as-prepared magnetic photocatalysts by XRD, SEM, TEM, XPS, UV-vis diffuse reflectance spectra, it was found that the as-prepared magnetic photocatalysts were synthesized by the coupling of Bi2 WO6 and Fe3 O4 , and introduction of appropriated Fe3 O4 can improved nanospheres morphology and visible-light response...
February 15, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/28199049/towards-organic-zeolites-and-inclusion-catalysts-heptazine-imide-salts-can-exchange-metal-cations-in-the-solid-state
#16
Markus Antonietti, Aleksandr Savateev, Sergey Pronkin, Marc Willinger, Dariya Dontsova
Highly crystalline potassium (heptazine imides) were prepared by the thermal condensation of substituted 1,2,4-triazoles in eutectic salt melts. These semiconducting salts are already known to be highly active photocatalysts, e.g. for the visible light driven generation of hydrogen from water. Herein, we show that within the solid state structure, potassium ions can be exchanged to other metal ions while the crystal habitus is essentially preserved.
February 15, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28197943/hydrothermal-synthesized-magnetically-separable-mesostructured-h2ti3o7-%C3%AE-fe2o3-nanocomposite-for-organic-dye-removal-via-adsorption-and-its-regeneration-reuse-through-synergistic-non-radiation-driven-h2o2-activation
#17
Harsha Narayani, Manu Jose, K Sriram, Satyajit Shukla
Hydrogen titanate (H2Ti3O7) nanotubes/nanosheets (HTN) are emerging class of adsorbent material which possess unique property of activating hydrogen peroxide (H2O2) to generate the reactive oxygen species (ROS), such as superoxide radical ions (O2(.-)) and hydroxyl radicals (·OH), effective in the decomposition of surface-adsorbed dye. However, HTN are non-magnetic which create hurdle in their effective separation from the treated aqueous solution. To overcome this issue, magnetic nanocomposites (HTNF) composed of HTN and maghemite (γ-Fe2O3) nanoparticles have been processed by subjecting the core-shell magnetic photocatalyst consisting of γ-Fe2O3/silica (SiO2)/titania (TiO2), having varying amounts of TiO2 in the shell to the hydrothermal conditions...
February 14, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28195666/stable-hydrophobic-metal-oxide-photocatalysts-via-grafting-polydimethylsiloxane-brush
#18
Sanghyuk Wooh, Noemí Encinas, Doris Vollmer, Hans-Jürgen Butt
Polydimethylsiloxane (PDMS) can be grafted to metal-oxide photocatalysts such as titanium oxide by simple UV irradiation in solution or melt. The PDMS graft metal oxides are still photocatalytically active. They are hydrophobic, liquid repellent, self-cleaning, prevent biofouling and are long-term stable even in UV light.
February 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28195198/the-gadolinium-gd-3-and-tin-sn-4-co-doped-bifeo3-nanoparticles-as-new-solar-light-active-photocatalyst
#19
Syed Irfan, Syed Rizwan, Yang Shen, Liangliang Li, Asfandiyar, Sajid Butt, Ce-Wen Nan
The process of photocatalysis is appealing to huge interest motivated by the great promise of addressing current energy and environmental issues through converting solar light directly into chemical energy. However, an efficient solar energy harvesting for photocatalysis remains a critical challenge. Here, we reported a new full solar spectrum driven photocatalyst by co-doping of Gd(3+) and Sn(4+) into A and B-sites of BiFeO3 simultaneously. The co-doping of Gd(3+) and Sn(4+) played a key role in hampering the recombination of electron-hole pairs and shifted the band-gap of BiFeO3 from 2...
February 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28194678/role-of-precursors-on-the-photophysical-properties-of-carbon-nitride-and-its-application-for-antibiotic-degradation
#20
Suyana Panneri, Priyanka Ganguly, Balagopal N Nair, Abdul Azeez Peer Mohamed, Krishna Gopa Kumar Warrier, Unnikrishnan Nair Saraswathy Hareesh
In this paper, we provide a comprehensive evaluation of graphitic carbon nitride (C3N4) powders derived from the four different precursors melamine, cyanamide, thiourea, and urea for the photocatalytic degradation of tetracycline (TC) antibiotic under sunlight irradiation. The powders were synthesized by employing the conventional thermal decomposition method. The synthesized powders were examined using different characterization tools for evaluating the photophysical properties. The degradation profile revealed that urea-derived C3N4 showed the highest activity while melamine-derived C3N4 showed the least activity...
February 14, 2017: Environmental Science and Pollution Research International
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