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Fe2B magnetic nanoparticles: Photocatalytic activity towards degradation of Bisphenol A

cERAMIcS INTERNATIONAL 2022年第22期48卷 33660-33669页

作者： Rezaei, Fatemeh Akarsu, ceyhun Khakzad, Farnoud Mertdinc, Siddika Agaogullari, Duygu Olmez-Hanci, Tugba Istanbul Tech Univ Fac Civil Engn Dept Environm Engn TR-34469 Istanbul Turkey Istanbul Univ Cerrahpasa Dept Environm Engn TR-34320 Istanbul Turkey Istanbul Tech Univ Fac Chem & Met Engn Particulate Mat Labs PML Met & Mat Engn Dept TR-34469 Istanbul Turkey Istanbul Tech Univ Prof Dr Adnan Tekin Mat Sci & Prod Technol Appl R TR-34469 Istanbul Turkey

Plasticizers such as Bisphenol A (BPA) are highly persistent organic pollutants that are present in raw water as well as in effluents from wastewater treatment plants (WWTP) at levels of parts per trillion (ng L-1) with a high potential to cause carcinogenic and teratogenic effects in the aquatic environment. This research aimed to evaluate the potential of catalytic oxidation to treat BPA with a novel iron boride (Fe2B) magnetic nanocatalyst. Several techniques were used for the catalyst characterization: X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), scanning/transmission electron microscopy (SEM/TEM), particle size analysis, and vibrating sample magnetometry (VSM). Experimental results indicated complete BPA degradation with Fe2B nanocatalyst where the operating conditions are BPA = 1 mg/L, pHo = 3.0, T = 25 degrees c, t = 120 min, and Fe2B = 0.01 g/L. The investigation of the catalytic mechanism showed that hydroxil radicals in the bulk solution are the dominant reactive species in the BPA degradation. Moreover, the removal efficiency did not decrease after 3 times usage of Fe2B nanocatalyst, which reveals its excellent reusability. The acute toxicity results of Fe2B indicated that the toxicity depended on the exposure time, the catalyst concentration, and the type of selected test organism. Thus, the laboratory-scale tests resulted that the synthesized Fe2B can be used as an effective catalyst for the treatment of BPA.

关键词： c chemical properties D Borides E Functional applications Magnetic nanocatalyst

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Synthesis of carbon/Sulfur Nanolaminates by Electrochemical Extraction of Titanium from Ti₂Sc

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ANGEWANDTE cHEMIE-INTERNATIONAL EDITION 2015年第16期54卷 4810-4814页

作者： Zhao, Meng-Qiang Sedran, Morgane Ling, Zheng Lukatskaya, Maria R. Mashtalir, Olha Ghidiu, Michael Dyatkin, Boris Tallman, Darin J. Djenizian, Thierry Barsoum, Michel W. Gogotsi, Yury Drexel Univ AJ Drexel Nanomat Inst Philadelphia PA 19104 USA Drexel Univ Mat Sci & Engn Dept Philadelphia PA 19104 USA Aix Marseille Univ MADIREL Lab FR-13288 Marseille 9 France Dalian Univ Technol State Key Lab Fine Chem Liaoning Key Lab Energy Mat & Chem Engn Carbon Res Lab Dalian 116024 Peoples R China

Herein we electrochemically and selectively extract Ti from the MAX phase Ti2Sc to form carbon/sulfur (c/S) nanolaminates at room temperature. The products are composed of multi-layers of c/S flakes, with predominantly amorphous and some graphene-like structures. covalent bonding between c and S is observed in the nanolaminates, which render the latter promising candidates as electrode materials for Li-S batteries. We also show that it is possible to extract Ti from other MAX phases, such as Ti3Alc2, Ti3Snc2, and Ti2Gec, suggesting that electrochemical etching can be a powerful method to selectively extract the M elements from the MAX phases, to produce AX layered structures, that cannot be made otherwise. The latter hold promise for a variety of applications, such as energy storage, catalysis, etc.

关键词： c S nanolaminates electrochemical etching layered structures MAX phase selective extraction

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Diamond FET: high-speed optical switch

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ELEcTRONIcS LETTERS 2010年第24期46卷 1614-1615页

作者： conte, G. Ricciotti, G. calvani, P. Giovine, E. Univ Roma Tre Dept Elect Engn I-00146 Rome 84 Italy CNR IFN Inst Photon & Nanotechnol I-00156 Rome Italy

A high-speed optical switch based on an ultraviolet sensitive surface channel MESFET fabricated on polycrystalline diamond has been developed. Saturation response to a nanosecond pulsed excimer laser has been demonstrated. Such an opaque gate three-terminal device is suitable for power applications where electromagnetic interference on power control interfaces is not negligible.

关键词： c Schottky gate field effect transistors diamond diamond FET electro-optical switches electromagnetic interference high-speed optical switch high-speed optical techniques integrated optoelectronics nanosecond pulsed excimer laser opaque gate three-terminal device optical fabrication optical fabrication optical saturation optical saturation ultraviolet sensitive surface channel MESFET

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High dose implantation in 6H-Sic

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SILIcON cARBIDE AND RELATED MATERIALS, EcScRM2000 2001年第0期353-356卷 579-582页

作者： Heera, V Skorupa, W Stoemenos, J Pécz, B Forschungszentrum Rossendorf EV DE-01314 Dresden Germany Aristotelian Univ Salonika Dept Phys GR-54006 Salonika Greece Res Inst Tech Phys & Mat Sci HU-1525 Budapest Hungary

The phase formation in 6H-Sic due to high dose implantation was studied as function of temperature by means of transmission electron microscopy. Two examples demonstrate the feasibility of ion beam synthesis of crystalline phases in 6H-Sic which are epitaxially aligned with the surrounding matrix. In the first example Al(+) ions were implanted up to concentrations of 15 at% at temperatures between RT and 800 degreesc. The precipitation of carbon phases due to high dose c(+) implantation in 6H-Sic at temperatures between 300 degreesc and 900 degreesc was investigated in the second example.

关键词： 6H-Sic aluminium Al(4)c(3) c diamond high dose implantation phase formation TEM

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Growth of multi-wall carbon nanotubes with three-dimensional network microstructure

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MIcRO & NANO LETTERS 2009年第2期4卷 112-115页

作者： Sadeghian, Z. Res Inst Petr Ind Gas Res Div Tehran Iran

Multi-wall carbon nanotubes (MWcNTs) were grown by spray pyrolysis of acetylene as the carbon source in the presence of Au-co as catalyst precursors. A high yield of network-shaped carbon nanotubes (cNTs) with further purification has been obtained in the optimal conditions. The optimum synthesis parameters included a synthesis temperature of 700 degrees c, growth time of 30 min, and a flow rate of acetylene and hydrogen of 40 and 300 sccm, respectively. The morphology and structure features of the MWcNTs are characterised using scanning electron microscopy, transmission electron microscopy, energy dispersive spectra, Raman spectroscopy and thermogravimetry analyses.

关键词： Low-dimensional structures: growth, structure and nonelectronic properties multiwall carbon nanotube structure temperature 700 c catalyst Electromagnetic radiation spectrometry (chemical analysis) Decomposition reactions (pyrolysis, dissociation, and group ejection) c thermogravimetry analysis transmission electron microscopy Raman spectroscopy network-shaped carbon nanotubes scanning electron microscopy Microstructure Optical properties of fullerenes and related materials (thin films/low-dimensional structures) Structure of fullerenes and fullerene-related materials Raman spectra multiwall carbon nanotube growth pyrolysis Infrared and Raman spectra in inorganic crystals thermal analysis multiwall carbon nanotube morphology hydrogen energy dispersive spectra Methods of nanofabrication and processing carbon nanotubes 3D network microstructure acetylene nanofabrication spray pyrolysis X-ray chemical analysis purification

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Dielectric anisotropy of nematic liquid crystals loaded with carbon nanotubes in microwave range

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ELEcTRONIcS LETTERS 2010年第10期46卷 693-694页

作者： Trushkevych, O. Goelden, F. Pivnenko, M. Xu, H. collings, N. crossland, W. A. Mueller, S. Jakoby, R. Univ Cambridge Dept Engn Elect Engn Div Ctr Adv Photon & Elect Cambridge CB3 0FA England Tech Univ Darmstadt D-64283 Darmstadt Germany

Liquid crystals are attractive materials for microwave applications as tunable dielectrics owing to low losses and high anisotropy of dielectric properties. The possibility of further enhancing their dielectric anisotropy is studied by loading with highly polarisable and anisotropic rods-carbon nanotubes at various concentrations. The studies are performed using two different methods, one in the range 1-4 GHz and the other at 30 GHz. More than two times increase of microwave dielectric anisotropy in liquid crystals is reported when loaded with 0.01% wt of carbon nanotubes, which is a metastable suspension and 28% increase in an equilibrated suspension. The stability of the Lc-cNT composites is discussed.

关键词： c carbon nanotubes carbon nanotubes dielectric losses frequency 1 GHz to 4 GHz liquid crystal-cNT composites microwave dielectric anisotropy microwave materials nematic liquid crystals nematic liquid crystals particle reinforced composites tunable dielectrics

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carbon nanotube-supported bimetallic Pt-Fe catalysts for nitrobenzene hydrogenation

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MIcRO & NANO LETTERS 2014年第2期9卷 97-99页

作者： Hao, Liang Jiao, Qingze Hu, Yanting Li, Hansheng Zhao, Yun Beijing Inst Technol Sch Chem Engn & Environm Beijing 100081 Peoples R China Beijing Inst Technol Zhuhai 519085 Guangdong Peoples R China

carbon nanotube (cNT)-supported Pt-Fe catalysts were prepared by a chemical reduction method using chloroplatinic acid and ferric nitrate as starting materials. The structure and the morphology of the catalysts were characterised by an X-ray diffractometer, transmission electron microscopy and inductively coupled plasma atomic emission spectrometry. The catalytic performance for nitrobenzene hydrogenation was evaluated under atmospheric pressure at an ambient temperature. The bimetallic Pt-Fe/cNT catalysts showed much higher activity than Pt/cNTs with a similar Pt content for nitrobenzene hydrogenation.

关键词： atomic emission spectroscopy bimetals carbon nanotubes catalysis catalysts hydrogenation iron alloys organic compounds platinum alloys reduction (chemical) transmission electron microscopy X-ray diffraction carbon nanotube-supported bimetallic PtaEuro"Fe catalysts nitrobenzene hydrogenation chemical reduction method chloroplatinic acid ferric nitrate structure morphology X-ray diffractometer transmission electron microscopy inductively coupled plasma atomic emission spectrometry atmospheric pressure ambient temperature Pt-Fe c

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Biological potential and bio-refinery from marine macro algae caulerpa scalpelliformis

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BIOMASS cONVERSION AND BIOREFINERY 2024年第7期14卷 8909-8915页

作者： Seedevi, Palaniappan Saveetha Inst Med & Tech Sci SIMATS Saveetha Sch Engn Inst Biotechnol Dept Res & Innovat Chennai 602105 Tamil Nadu India

The present investigation evaluated the toxic effect and bioactive potential of marine macro algae caulerpa scalpelliformis. The crude methanolic extract was fractionated in diethylaminoethyl (DEAE) cellulose column chromatography using Nacl (0.1-10 M). The fractions were dialyzed and freeze-dried. The active fractions (F1, F2, and F3) were obtained using TLc chromatography. The crude methanolic extract and fractions showed strong hemolytic activity of 129.55, 73.73, 43.47, and 37.73 HT/mg in chicken blood, respectively, the human blood group (AB and O) showed considerable hemolytic activity of 73.73, 43.47, and 37.73 HT/mg, respectively, and the fraction (F3) had no activity. The acute toxic effect of the crude methanolic extract and fractions (F1, F2, and F3) showed the lethal dose (LD50) at 176, 121.5, 138, and 152 mg/kg body weight. The crude methanolic extract and fractions indicated strong analgesic activity at the ratio of 0.26, 0.37, 0.11, and 0.10 using the tail flick test in mice at 12.5 mg/kg body weight. These results suggest that the methanolic extract and its fractions from c. scalpelliformis may be potential pharmacological agents.

关键词： Hemolytic activity Acute toxicity Analgesic activity c scalpelliformis

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Theoretical studies of processes involving implanted muons

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cURRENT OPINION IN SOLID STATE & MATERIALS ScIENcE 1996年第6期1卷 841-845页

作者： Fisher, AJ Department of Physics and Astronomy University College London Gower Street London WC1E 6BT UK

Recent advances in the theoretical study of implanted muons in solids include progress in quantitative modelling of the energetics of binding sites taken up by the muon after implantation. In the last two years, the range of materials that has been studied has grown from simple elemental crystals to complex molecular materials;path-integral methods have also been introduced to study the quantum-mechanical effects arising from the light mass of the muon.

关键词： μ LcR muon level-crossing resonance μ SR muon spin rotation/muon spin relaxation Mu muonium atom T c critical temperature

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Single-Molecule Interactions between Heme Proteins and carboxylic Groups in Various chemical Environments

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cHEMELEcTROcHEM 2020年第21期7卷 4441-4445页

作者： Hao, Xian Zhang, Jingdong Yang, Yifei Wang, Hongda chi, Qijin Nanchang Univ Sch Publ Hlth Nanchang 330006 Jiangxi Peoples R China Nanchang Univ Jiangxi Prov Key Lab Prevent Med Nanchang 330006 Jiangxi Peoples R China Tech Univ Denmark Dept Chem DK-2800 Lyngby Denmark Chinese Acad Sci Changchun Inst Appl Chem Res Ctr Biomembran State Key Lab Electroanalyt Chem Changchun 130022 Jilin Peoples R China

Noncovalent chemical interactions, including electrostatic interactions, hydrogen bonding, and hydrophobic interactions, constitute crucial driving forces in the bottom-up assembly of multifunctional molecular complexes and nanomaterials. Electrostatic interactions in chemical environments are generally considered as non-specific interactions, which pose notable challenges for the control and direct measurement of electrostatic forces at the single-molecule level. Here, we report a model system consisting of cytochrome c and molecules containing carboxyl groups, and use electrochemical AFM force spectroscopy to navigate the electrostatic forces of the system under various chemical conditions. The effects of solution pH, ion strength, and redox states of cytochrome c on electrostatic interactions as well as control over these parameters are systematically studied. This work provides a useful approach for investigating intermolecular electrostatic interactions at the single-molecule level.

关键词： force spectroscopy single-molecule forces electrostatic interaction cytochrome c electrochemistry

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