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https://www.readbyqxmd.com/read/28110062/metal-free-hybrids-of-graphitic-carbon-nitride-and-nanodiamonds-for-photoelectrochemical-and-photocatalytic-applications
#1
Li Zhou, Huayang Zhang, Xiaochen Guo, Hongqi Sun, Shaomin Liu, Moses O Tade, Shaobin Wang
Graphitic carbon nitride (g-C3N4) has been considered as a metal-free, cost-effective, eco-friendly and efficient catalyst for various photoelectrochemical applications. However, compared to conventional metal-based photocatalysts, its photocatalytic activity is still low because of the low mobility of carriers restricted by the polymer nature. Herein, a series of hybrids of g-C3N4 (GCN) and nanodiamonds (NDs) were synthesized using a solvothermal method. The photoelectrochemical performance and photocatalytic efficiency of the GCN/NDs were investigated by means of the generation of photocurrent and photodegradation of methylene blue (MB) solutions under UV-visible light irradiations...
January 12, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28105608/ag-nanoparticles-located-on-three-dimensional-pine-tree-like-hierarchical-tio2-nanotube-array-films-as-high-efficiency-plasmonic-photocatalysts
#2
Jinxia Xu, Zhenhuan Wang, Wenqing Li, Xingang Zhang, Dong He, Xiangheng Xiao
High specific surface area three-dimensional pine tree-like hierarchical TiO2 nanotube array films loaded with Ag nanoparticles were successfully prepared by one-step hydrothermal reaction combining with simple and feasible magnetron sputtering. The composite Ag/TiO2-branched nanotube arrays show outstanding photocatalytic property, which is attributed to the boost of plasmonic enhancement carrier generation and separation, higher specific surface area, higher organic pollutant absorption, faster charge transport, and superior light-harvesting efficiency for efficient charge collection...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28105400/discovery-of-a-novel-sn-ii-based-oxide-%C3%AE-snmoo4-for-daylight-driven-photocatalysis
#3
Hiroyuki Hayashi, Shota Katayama, Takahiro Komura, Yoyo Hinuma, Tomoyasu Yokoyama, Ko Mibu, Fumiyasu Oba, Isao Tanaka
Daylight-driven photocatalysts have attracted much attention in the context of "green" technology. Although various active materials have been reported and their applications are rapidly increasing, many are discovered after enormous experimental efforts. Herein the discovery of a novel oxide photocatalyst, β-SnMoO4, is demonstrated via a rational search of 3483 known and hypothetical compounds with various compositions and structures over the whole range of SnO-MO q/2 (M: Ti, Zr, and Hf (q = 4); V, Nb, and Ta (q = 5); Cr, Mo, and W (q = 6)) pseudobinary systems...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28105391/one-dimensional-tio2-nanotube-photocatalysts-for-solar-water-splitting
#4
REVIEW
Mingzheng Ge, Qingsong Li, Chunyan Cao, Jianying Huang, Shuhui Li, Songnan Zhang, Zhong Chen, Keqin Zhang, Salem S Al-Deyab, Yuekun Lai
Hydrogen production from water splitting by photo/photoelectron-catalytic process is a promising route to solve both fossil fuel depletion and environmental pollution at the same time. Titanium dioxide (TiO2) nanotubes have attracted much interest due to their large specific surface area and highly ordered structure, which has led to promising potential applications in photocatalytic degradation, photoreduction of CO2, water splitting, supercapacitors, dye-sensitized solar cells, lithium-ion batteries and biomedical devices...
January 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/28102314/improved-solar-driven-photocatalytic-performance-of-highly-crystalline-hydrogenated-tio2-nanofibers-with-core-shell-structure
#5
Ming-Chung Wu, Ching-Hsiang Chen, Wei-Kang Huang, Kai-Chi Hsiao, Ting-Han Lin, Shun-Hsiang Chan, Po-Yeh Wu, Chun-Fu Lu, Yin-Hsuan Chang, Tz-Feng Lin, Kai-Hsiang Hsu, Jen-Fu Hsu, Kun-Mu Lee, Jing-Jong Shyue, Krisztián Kordás, Wei-Fang Su
Hydrogenated titanium dioxide has attracted intensive research interests in pollutant removal applications due to its high photocatalytic activity. Herein, we demonstrate hydrogenated TiO2 nanofibers (H:TiO2 NFs) with a core-shell structure prepared by the hydrothermal synthesis and subsequent heat treatment in hydrogen flow. H:TiO2 NFs has excellent solar light absorption and photogenerated charge formation behavior as confirmed by optical absorbance, photo-Kelvin force probe microscopy and photoinduced charge carrier dynamics analyses...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28102077/boosting-hot-electron-generation-exciton-dissociation-at-the-order-disorder-interfaces-in-polymeric-photocatalysts
#6
Hui Wang, Xianshun Sun, Dandan Li, Xiaodong Zhang, Shichuan Chen, Wei Shao, Yupeng Tian, Yi Xie
Excitonic effects, arising from the Coulomb interactions between photogenerated electrons and holes, dominate the optical excitation properties of semiconductors, whereas their influences on photocatalytic processes have seldom been discussed. In view of the competitive generation of exciton and hot carrier, exciton dissociation herein was proposed as an alternative strategy for hot-carrier harvesting in photocatalysts. Herein, by taking heptazine-based melon as an example, we verified that enhanced hot-carrier generation could be obtained in semicrystalline polymeric photocatalysts that contain abundant order-disorder interfaces, ascribing to the accelerated exciton dissociation...
January 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28101552/a-photo-auxiliary-approach-enabling-excited-state-classical-phototransformations-with-metal-free-visible-light-irradiation
#7
Akila Iyer, Steffen Jockusch, Jayaraman Sivaguru
Most traditional photoreactions require UV light to yield the desired product. To address this issue, photoreaction of hydrazide based chromophores was evaluated with visible light using a metal free photocatalyst to afford photoproducts in high yields. This hydrazide functionality itself may be removed/modified after the photoreaction, highlighting its role as a "photo-auxiliary". A preliminary mechanistic model based on photophysical experiments is provided to highlight the generality of the strategy.
January 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28098229/novel-synthesis-of-zno-pmma-nanocomposites-for-photocatalytic-applications
#8
Alessandro Di Mauro, Maria Cantarella, Giuseppe Nicotra, Giovanna Pellegrino, Antonino Gulino, Maria Violetta Brundo, Vittorio Privitera, Giuliana Impellizzeri
The incorporation of nanostructured photocatalysts in polymers is a strategic way to obtain novel water purification systems. This approach takes the advantages of: (1) the presence of nanostructured photocatalyst; (2) the flexibility of polymer; (3) the immobilization of photocatalyst, that avoids the recovery of the nanoparticles after the water treatment. Here we present ZnO-polymer nanocomposites with high photocatalytic performance and stability. Poly (methyl methacrylate) (PMMA) powders were coated with a thin layer of ZnO (80 nm thick) by atomic layer deposition at low temperature (80 °C)...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28094922/nano-photoelectrochemical-cell-arrays-with-spatially-isolated-oxidation-and-reduction-channels
#9
Hang-Ah Park, Siyuan Liu, Youngseok Oh, Paul A Salvador, Gregory S Rohrer, Mohammad F Islam
Photoelectrochemical conversion of solar energy is explored for many diverse applications but suffers from poor efficiencies due to limited solar absorption, inadequate charge carrier separation, redox half-reactions occurring in close proximity, and/or long ion diffusion lengths. We have taken a drastically different approach to the design of photoelectrochemical cells (PECs) to spatially isolate reaction sites at the nanoscale to different materials and flow channels, suppressing carrier recombination and back-reaction of intermediates while shortening ion diffusion paths and, importantly, avoiding mixed product generation...
January 20, 2017: ACS Nano
https://www.readbyqxmd.com/read/28094379/luminescent-aryl-group-eleven-metal-complexes
#10
José M López-de-Luzuriaga, Miguel Monge, M Elena Olmos
Among the coinage metal complexes displaying luminescent properties, those bearing C-donor aryl ligands have an increasing part in the chemistry of these metals. These types of ligands confer a high kinetic and thermodynamic stability on the complexes, but they can also be involved in the photoluminescent behaviour of the complexes. The development of new aryl-containing complexes of group eleven metals, the study of their photoluminescent properties and their related properties and applications are discussed in this perspective...
January 17, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28094366/band-gap-opening-in-stanene-induced-by-patterned-b-n-doping
#11
Priyanka Garg, Indrani Choudhuri, Arup Mahata, Biswarup Pathak
Stanene is a quantum spin Hall insulator and a promising material for electronic and optoelectronic devices. Density functional theory (DFT) calculations are performed to study the band gap opening in stanene by elemental mono-doping (B, N) and co-doping (B-N). Different patterned B-N co-doping is studied to change the electronic properties of stanene. A patterned B-N co-doping opens the band gap in stanene and its semiconducting nature persists under strain. Molecular dynamics (MD) simulations are performed to confirm the thermal stability of such a doped system...
January 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28093903/selectivity-enhancement-in-heterogeneous-photocatalytic-transformations
#12
Jiahui Kou, Chunhua Lu, Jian Wang, Yukai Chen, Zhongzi Xu, Rajender S Varma
Photocatalysis has been invariably considered as an unselective process (especially in water) for a fairly long period of time, and the investigation on selective photocatalysis has been largely neglected. In recent years, the field of selective photocatalysis is developing rapidly and now extended to several newer applications. This review focuses on the overall strategies which can improve the selectivity of photocatalysis encompassing a wide variety of photocatalysts, and modifications thereof, as well as the related vital processes of industrial significance such as reduction and oxidation of organics, inorganics, and CO2 transformation...
January 17, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28093899/crucial-role-of-donor-density-in-the-performance-of-oxynitride-perovskite-latio2n-for-photocatalytic-water-oxidation-reaction
#13
Feng-Qiang Xiong, Lipeng Wan, Yue Li, Tiju Thomas, Francis Joseph DiSalvo, Minghui Yang
LaTiO2N photocatalysts were prepared via thermal ammonalysis of flux-synthesized La2Ti2O7 and La2TiO5, and were investigated for water oxidation. Though LaTiO2N derived from La2TiO5 appears defect-free in UV-Vis-NIR and electron paramagnetic resonance spectroscopies, its performance is much lower than conventional La2Ti2O7-derived LaTiO2N with defects. It is shown by Mott-Schottky analysis that La2TiO5-derived LaTiO2N has significantly lower donor density; this can result in insufficient build-in electric field for the separation of photogenerated electrons and holes...
January 17, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28088115/in-situ-synthesis-of-novel-z-scheme-sns2-biobr-photocatalysts-with-superior-photocatalytic-efficiency-under-visible-light
#14
Fazheng Qiu, Wenjun Li, Fangzhi Wang, Hongda Li, Xintong Liu, Jiayi Sun
In this study, a novel SnS2/BiOBr heterojunction photocatalyst was synthesized via a facile in-situ growth strategy. The heterojunction interface was formed by loading BiOBr nanosheets on the surface of ultrathin hexagonal SnS2 nanoplates. UV/Vis diffuse reflectance spectroscopy (DRS) indicated that SnS2/BiOBr composites possessed stronger visible-light absorption. The as-fabricated SnS2/BiOBr heterojunction nanoplates exhibited considerable improvement in terms of photocatalytic activity for the degradation of rhodamine B (RhB) under visible light irradiation as compared with BiOBr and SnS2...
December 30, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28081483/enhanced-visible-light-driven-photocatalytic-bacteria-disinfection-by-g-c3n4-agbr
#15
Jun Deng, Jialiang Liang, Mian Li, Meiping Tong
g-C3N4-AgBr was synthesized by depositing AgBr nanoparticles onto g-C3N4. Scanning electron microscopy (SEM), Transmission electron microscope (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectra (DRS) and Photoluminescence (PL) spectra were employed to characterize the as-synthesized photocatalysts. The disinfection activities towards representative Gram-negative strain E. coli and Gram-positive strain S. aureus were examined under visible light irradiation...
January 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28080019/controlled-growth-of-metal-organic-framework-on-upconversion-nanocrystals-for-nir-enhanced-photocatalysis
#16
Mohua Li, Zhenjian Zheng, Yangqiong Zheng, Cao Cui, Chunxia Li, Zhengquan Li
Development of MOF-based photocatalysts is intriguing research due to their structural flexibility and tremendous catalytic sites, whereas most MOFs only can take use of UV/visible light and lack of response to NIR light. Herein, we present a facile approach to integrate upconversion nanoparticles (UCNPs) with MOF to build a NIR-responsive composite photocatalyst. The MOF shell with controllable thickness can be grown on the UCNPs, thus exhibiting tunable photocatalytic activities under NIR irradiation. Furthermore, we extend visible absorption of the MOF shell by adding -NH2 groups so that the composite photocatalysts have a better utilization of UC emissions and sunlight to improve their activities...
January 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28079971/au-la2-ti2-o7-nanostructures-sensitized-with-black-phosphorous-for-plasmon-enhanced-photocatalytic-hydrogen-production-in-visible-and-near-infrared-light
#17
Mingshan Zhu, Xiaoyan Cai, Mamoru Fujitsuka, Junying Zhang, Tetsuro Majima
Efficient utilization of solar energy is a high-priority target and the search for suitable materials as photocatalysts that not only can harvest the broad wavelength of solar light, from UV to near-infrared (NIR) region, but also can achieve high and efficient solar-to-hydrogen conversion is one of the most challenging missions. Herein, using Au/La2 Ti2 O7 (BP-Au/LTO) sensitized with black phosphorus (BP), a broadband solar response photocatalyst was designed and used as efficient photocatalyst for H2 production...
January 12, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28074948/hot-electron-driven-photocatalytic-water-splitting
#18
Bingya Hou, Lang Shen, Haotian Shi, Rehan Kapadia, Stephen B Cronin
We report measurements of photocatalytic water splitting using Au films with and without TiO2 coatings. In these structures, a thin (3-10 nm) film of TiO2 is deposited using atomic layer deposition (ALD) on top of a 100 nm thick Au film. We utilize an AC lock-in technique, which enables us to detect the relatively small photocurrents (∼μA) produced by the short-lived hot electrons that are photoexcited in the metal. Under illumination, the bare Au film produces a small AC photocurrent (<1 μA) for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) due to hot electrons and hot holes, respectively, that are photoexcited in the Au film...
January 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28074599/functionalization-of-c-h-bonds-by-photoredox-catalysis
#19
REVIEW
Qixue Qin, Heng Jiang, Zhentao Hu, Daan Ren, Shouyun Yu
Visible-light photoredox catalysis has been successfully used in the functionalization of inert C-H bonds including C(sp(2) )-H bonds of arenes and C(sp(3) )-H bonds of aliphatic compounds over the past decade. These transformations are typically promoted by the process of single-electron-transfer (SET) between substrates and photo-excited photocatalyst upon visible light irradiation (household bulbs or LEDs). Compared with other synthetic strategies, such as the transition-metal catalysis and traditional radical reactions, visible-light photoredox approach has distinct advantages in terms of operational simplicity and practicability...
January 11, 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/28069236/recent-advancements-in-the-sonophotocatalysis-spc-and-doped-sonophotocatalysis-dspc-for-the-treatment-of-recalcitrant-hazardous-organic-water-pollutants
#20
REVIEW
Debabrata Panda, Sivakumar Manickam
: Sonophotocatalysis (SPC) is considered to be one of the important wastewater treatment techniques and hence attracted the attention of researchers to eliminate recalcitrant hazardous organic pollutants from aqueous phase. In general, SPC refers to the integrated use of ultrasonic sound waves, ultraviolet radiation and the addition of a semiconductor material which functions as a photocatalyst. Current research has brought numerous improvements in the SPC based treatment by opting visible light irradiation, nanocomposite catalysts and numerous catalyst supports for better stability and performance...
May 2017: Ultrasonics Sonochemistry
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