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https://www.readbyqxmd.com/read/28549376/one-step-electrospinning-route-of-srtio3-modified-rutile-tio2nanofibers-and-its-photocatalytic-properties
#1
Weijie Zhao, Jing Zhang, Jiaqi Pan, Jianfeng Qiu, Jiantao Niu, Chaorong Li
The SrTiO3 modified rutile TiO2 composite nanofibers were synthesized by a simple electrospinning technique. The result of XRD, SEM and TEM indicate that the SrTiO3/TiO2 heterojuction has been prepared successfully. Compared with the TiO2 and SrTiO3, the photocatalytic activity of the SrTiO3/TiO2 (rutile) for the degradation of methyl orange exhibits an obvious enhancement under UV illumination. which is almost 2 times than that of bare TiO2 (rutile) nanofiber. Further, the high crystallinity and photon-generated carrier separation of the SrTiO3/TiO2 heterojuction are considered as the main reason for this enhancement...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28549326/electrochemical-decolorization-of-methyl-red-by-ruo2-iro2-tio2-electrode-and-biodegradation-with-pseudomonas-stutzeri-mn1-and-acinetobacter-baumannii-mn3-an-integrated-approach
#2
Kuppusamy Sathishkumar, Sivaji Sathiyaraj, Punniyakotti Parthipan, Agrawal Akhil, Kadarkarai Murugan, Aruliah Rajasekar
Textile effluent consists of enormous quantities of toxic dyes, which are being discharged into natural aqueous system and thus contaminate the water quality. Hence it is important to develop an eco-friendly and cost effective technology to treat the dyes contaminated wastewater. In this research, an integrated approach of electrochemical oxidation (EO) and biodegradation process (BP) was studied of methyl red (MR) dye. In EO, RuO2-IrO2-TiO2 is used as anode and titanium mesh electrode as cathode. This was followed by BP of the treated EO effluent...
May 15, 2017: Chemosphere
https://www.readbyqxmd.com/read/28548665/enhanced-photocatalytic-degradation-of-amaranth-dye-on-mesoporous-anatase-tio2-evidence-of-c-n-n-double-bond-length-as-m-dash-n-bond-cleavage-and-identification-of-new-intermediates
#3
Amarja P Naik, Akshay V Salkar, Mahesh S Majik, Pranay P Morajkar
The photocatalytic degradation mechanism of Amaranth, a recalcitrant carcinogenic azo dye, was investigated using mesoporous anatase TiO2 under sunlight. Mesoporous anatase TiO2 of a high photocatalytic activity has been synthesized using a sol-gel method and its photocatalytic activity for the degradation of Amaranth dye has been evaluated with respect to Degussa P25. The effect of bi-dentate complexing agents like oxalic acid, ethylene glycol and urea on the surface properties of TiO2 catalyst has been investigated using TG-DTA, FTIR, HR-TEM, SAED, PXRD, EDS, UV-DRS, PL, BET N2 adsorption-desorption isotherm studies and BJH analysis...
May 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28548289/effects-of-food-borne-nanomaterials-on-gastrointestinal-tissues-and-microbiota
#4
REVIEW
Hans Bouwmeester, Meike van der Zande, Mark A Jepson
Ingestion of engineered nanomaterials is inevitable due to their addition to food and prevalence in food packaging and domestic products such as toothpaste and sun cream. In the absence of robust dosimetry and particokinetic data, it is currently challenging to accurately assess the potential toxicity of food-borne nanomaterials. Herein, we review current understanding of gastrointestinal uptake mechanisms, consider some data on the potential for toxicity of the most commonly encountered classes of food-borne nanomaterials (including TiO2 , SiO2, ZnO, and Ag nanoparticles), and discuss the potential impact of the luminal environment on nanoparticle properties and toxicity...
May 26, 2017: Wiley Interdisciplinary Reviews. Nanomedicine and Nanobiotechnology
https://www.readbyqxmd.com/read/28548158/visible-light-assisted-hydrogen-generation-from-complete-decomposition-of-hydrous-hydrazine-using-rhodium-modified-tio2-photocatalysts
#5
Pawan Kumar, Anurag Kumar, Clémence Queffélec, Dietrich Gudat, Qi Wang, Suman L Jain, Rabah Boukherroub, Sabine Szunerits
Hydrogen is considered to be an ideal energy carrier, which produces only water when combined with oxygen and thus has no detrimental effect on the environment. While the catalytic decomposition of hydrous hydrazine for the production of hydrogen is well explored, little is known about its photocatalytic decomposition. The present paper describes a highly efficient photochemical methodology for the production of hydrogen through the decomposition of aqueous hydrazine using titanium dioxide nanoparticles modified with a Rh(i) coordinated catechol phosphane ligand (TiO2-Rh) as a photocatalyst under visible light irradiation...
May 26, 2017: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/28546886/high-photocatalytic-activity-of-fe2o3-tio2-nanocomposites-prepared-by-photodeposition-for-degradation-of-2-4-dichlorophenoxyacetic-acid
#6
Shu Chin Lee, Hendrik O Lintang, Leny Yuliati
Two series of Fe2O3/TiO2 samples were prepared via impregnation and photodeposition methods. The effect of preparation method on the properties and performance of Fe2O3/TiO2 for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) under UV light irradiation was examined. The Fe2O3/TiO2 nanocomposites prepared by impregnation showed lower activity than the unmodified TiO2, mainly due to lower specific surface area caused by heat treatment. On the other hand, the Fe2O3/TiO2 nanocomposites prepared by photodeposition showed higher photocatalytic activity than the unmodified TiO2...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28545297/polymer-chromophore-catalyst-assembly-for-solar-fuel-generation
#7
Junlin Jiang, Benjamin D Sherman, Yan Zhao, Ru He, Ion Ghiviriga, Leila Alibabaei, Thomas J Meyer, Gyu Leem, Kirk S Schanze
A polystyrene-based chromophore-catalyst assembly (poly-2) has been synthesized and assembled at a mesoporous metal oxide photoanode. The assembly contains water oxidation catalyst centers based on [Ru(trpy)(phenq)(2+)] (Ru-Cat) and a [Ru(bpy)3](2+) derivative (Ru-C) as chromophores (trpy= 2,2';6,2″- terpyridine, phenq = 2-(quinol-8'-yl)-1,10-phenanthroline and bpy = 2,2'-bipyridine). The photophysical and electrochemical properties of the polychromophore-oxidation catalyst assembly were investigated in solution and at the surface of mesoporous metal oxide films...
May 26, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28544657/a-strategy-to-enhance-the-efficiency-of-quantum-dot-sensitized-solar-cells-by-decreasing-the-electron-recombinations-with-polyoxometalate-tio2-as-the-electronic-interface-layer
#8
Li Chen, Wei-Lin Chen, Jian-Ping Li, Jia-Bo Wang, En-Bo Wang
The serious electron recombination occurring in TiO2/quantum dot sensitizer/electrolyte interface is the key reason for hindering the further efficiency improvement of QDSCs. Polyoxometalate(POM) can be as electron transfer media to decreasing electron recombination of photoelectric device, which is due to the excellent oxidation reduction properties and thermostability. So in this paper, POM/TiO2 electronic interface layer prepared by a simple layer-by-layer self-assembly method is added between FTO and mesoporous TiO2 in the photoanode of the QDSCs, and their effects on the photovoltaic performance are systematically investigated...
May 23, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28544566/aqueous-oxidations-started-by-tio%C3%A2-photo-induced-holes-can-be-a-rate-determining-step
#9
Yuanzheng Gong, Chun Yang, Hongwei Ji, Chuncheng Chen, Wanhong Ma, Jincai Zhao
In aqueous TiO2 photocatalytic hydroxylation of weakly polar aromatics, unlike usual polar aromatic cases of normal H/D KIEs, a series of inverse H/D KIEs of 0.7~0.8 were observed, which indicated that the oxidtion started by photo-induced hvb+ can be the rate-determining step.
May 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28544545/cytoprotective-encapsulation-of-individual-jurkat-t-cells-within-durable-tio2-shells-for-t-cell-therapy
#10
Wongu Youn, Eun Hyea Ko, Mi-Hee Kim, Matthew Park, Daewha Hong, Gulaim A Seisenbaeva, Vadim G Kessler, Insung S Choi
Lymphocytes, such as T cells and natural killer (NK) cells, have therapeutic promises in adoptive cell transfer (ACT) therapy, where the cells are activated and expanded in vitro, and then infused into a patient. However, the in vitro preservation of labile lymphocytes during transfer, manipulation, and storage has been one of the bottlenecks in the development and commercialization of therapeutic lymphocytes. Herein, we suggest a "cell-in-shell" (a.k.a. artificial spore) strategy to enhance the cell viability in the practical settings, while maintaining biological activities for therapeutic efficacy...
May 25, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28540970/nanostructural-and-photo-electrochemical-properties-of-solution-spin-coated-cu2znsns4-tio2-nanorod-forest-films-with-an-improved-photovoltaic-performance
#11
Zhuoran Wang, Raynald Gauvin, George P Demopoulos
Cu2ZnSnS4 (CZTS), other than in standard p-n junction device architecture, can be employed as a broad light absorber upon coating onto a wide bandgap electron conducting TiO2 film. Earlier CZTS sensitized TiO2 films have yielded low photoconversion efficiency and Voc. In this work, a water-ethanol solution spin coating approach has been applied to directly deposit CZTS nanocrystallites on rutile TiO2 nanorods grown on an FTO substrate (TNR) for evaluation in a sensitized solar cell configuration. The FTO@TNR@CZTS photoanode following controlled annealing is shown to exhibit improved photovoltaic properties...
May 25, 2017: Nanoscale
https://www.readbyqxmd.com/read/28539667/strontium-loaded-titania-nanotube-arrays-repress-osteoclast-differentiation-through-multiple-signalling-pathways-in-vitro-and-in-vivo-studies
#12
Baoguo Mi, Wei Xiong, Na Xu, Hanfeng Guan, Zhong Fang, Hui Liao, Yong Zhang, Biao Gao, Xiang Xiao, Jijiang Fu, Feng Li
The loosening of implants is an important clinical issue, particularly for patients with osteoporosis. In these patients, an implant should preferably both promote osteoblast differentiation and repress osteoclastic resorption. In the present study, we fabricated coatings containing TiO2 nanotubes (NTs) incorporated with strontium (Sr) on titanium (Ti) surfaces through hydrothermal treatment. The amount of loaded Sr was controlled by hydrothermally treating the samples in a Sr(OH)2 solution for 1 and 3 h (samples NT-Sr1h and NT-Sr3h, respectively) and found that both types of NT-Sr samples inhibited osteoclast differentiation by reducing the expression of osteoclast marker genes...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539648/three-dimensionally-conformal-porous-microstructured-fabrics-via-breath-figures-a-nature-inspired-approach-for-novel-surface-modification-of-textiles
#13
Jianliang Gong, Bingang Xu, Xiaoming Tao
Breath figures (BFs) are a kind of water droplet arrays that can be formed by condensing aqueous vapor onto a cold surface, such as dewy phenomenon on a spider web. This study developed a BF-inspired approach for direct introduction of desired materials onto the textile surfaces with three-dimensionally conformal porous microstructures by the evaporation of solution-coated fabric under high humidity environment, which brings a brand-new kind of modified textiles, three-dimensionally conformal porous microstructured fabrics (CPMFs)...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539585/natural-convection-flow-of-a-nanofluid-in-an-inclined-square-enclosure-partially-filled-with-a-porous-medium
#14
A I Alsabery, A J Chamkha, H Saleh, I Hashim
This work analyses free convection flow of a nanofluid in an inclined square enclosure consisting of a porous layer and a nanofluid layer using the finite difference methodology. Sinusoidal temperature boundary conditions are imposed on the two opposing vertical walls. Nanofluids with water as base and Ag or Cu or Al2O3 or TiO2 nanoparticles are considered for the problem. The related parameters of this study are the Darcy number, nanoparticle volume fraction, phase deviation, amplitude ratio, porous layer thickness and the inclination angle of the cavity...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28538093/toxic-byproduct-formation-during-electrochemical-treatment-of-latrine-wastewater
#15
Justin T Jasper, Yang Yang, Michael R Hoffmann
Electrochemical systems are an attractive option for onsite latrine wastewater treatment due to their high efficiency and small footprint. While concerns remain over formation of toxic byproducts during treatment, rigorous studies examining byproduct formation are lacking. Experiments treating authentic latrine wastewater over variable treatment times, current densities, chloride concentrations, and anode materials were conducted to characterize byproducts and identify conditions that minimize their formation...
May 24, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28537617/buoyancy-increase-and-drag-reduction-through-a-simple-superhydrophobic-coating
#16
Gi Byoung Hwang, Adnan Patir, Kristopher Page, Yao Lu, Elaine Allan, Ivan P Parkin
A superhydrophobic paint was fabricated using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTES), TiO2 nanoparticles and ethanol. The paint has potential for aquatic application of a superhydrophobic coating as it induces increased buoyancy and drag reduction. Buoyance testing showed that the reduction of surface energy by superhydrophobic coating made it feasible that glass, a high density material, was supported by the surface tension of water. In a miniature boat sailing test, it was shown that the low energy surface treatment decreased the adhesion of water molecules to the surface of the boat resulting in a reduction of the drag force...
May 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28537609/nanoparticle-induced-oxidation-of-corona-proteins-initiates-an-oxidative-stress-response-in-cells
#17
Dhanya T Jayaram, Sabiha Runa, Melissa L Kemp, Christine K Payne
Titanium dioxide nanoparticles (TiO2 NPs), used as pigments and photocatalysts, are ubiquitous in our daily lives. Previous work has observed cellular oxidative stress in response to the UV-excitation of photocatalytic TiO2 NPs. In comparison, most human exposure to TiO2 NPs takes place in the dark, in the lung following inhalation or in the gut following consumption of TiO2 NP food pigment. Our spectroscopic characterization shows that both photocatalytic and food grade TiO2 NPs, in the dark, generate low levels of reactive oxygen species (ROS), specifically hydroxyl radicals and superoxides...
May 24, 2017: Nanoscale
https://www.readbyqxmd.com/read/28537374/single-walled-carbon-nanotubes-enhance-the-efficiency-and-stability-of-mesoscopic-perovskite-solar-cells
#18
Munkhbayar Batmunkh, Cameron James Shearer, Munkhjargal Bat-Erdene, Mark J Biggs, Joseph G Shapter
Carbon nanotubes are 1D nanocarbons with excellent properties and have been extensively used in various electronic and optoelectronic device applications including solar cells. Herein, we report a significant enhancement in the efficiency and stability of perovskite solar cells (PSCs) by employing single-walled carbon nanotubes (SWCNTs) in the mesoporous photoelectrode. It was found that SWCNTs provide both rapid electron transfer and advantageously shifts the conduction band minimum of the TiO2 photoelectrode and thus enhances all photovoltaic parameters of PSCs...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537028/enhanced-larvicidal-antibacterial-and-photocatalytic-efficacy-of-tio2-nanohybrids-green-synthesized-using-the-aqueous-leaf-extract-of-parthenium-hysterophorus
#19
Keerthika Thandapani, Manikandan Kathiravan, Elangovan Namasivayam, Indira Arulselvi Padiksan, Geetha Natesan, Manish Tiwari, Benelli Giovanni, Venkatachalam Perumal
Titanium dioxide nanoparticles are emerging as a biocompatible nanomaterial with multipurpose bioactivities. In this study, titanium dioxide (TiO2) nanoparticles were effectively synthesized using the aqueous leaf extracts of Parthenium hysterophorus prepared by microwave irradiation. TiO2 nanoparticles were fabricated by treating the P. hysterophorus leaf extracts with the TiO4 solution. Biologically active compounds such as alcohols, phenols, alkanes, and fluoroalkanes were involved in bioreduction of TiO4 into TiO2...
May 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28535952/the-effects-of-different-opacifiers-on-the-translucency-of-experimental-dental-composite-resins
#20
Karine Haas, Gulelala Azhar, Duncan J Wood, Keyvan Moharamzadeh, Richard van Noort
OBJECTIVE: The aim of this study was to evaluate the effects of different opacifiers on the translucency of experimental dental composite-resins. METHODS: Three metal oxides that are used as opacifiers were tested in this study: titanium oxide (TiO2), aluminium oxide (Al2O3) and zirconium oxide (ZrO2). Experimental composite-resins were fabricated containing 25wt.% urethane dimethacrylate (UDMA)-based resin matrix and 75% total filler including different concentrations of metal oxides (0, 0...
May 20, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
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