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Identification of a Reactive Ferrous Hydroxide in the Core-Shell Structure of Nano-Zero-Valent Iron by Mössbauer and X-Ray Photoelectron Spectroscopies

SSRN

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SSRN 2022年

作者： Ruby, Christian Abdelmoula, M. Mallet, M. Ghanbaja, Jaafar Coustel, R. Scudiero, Louis Wang, Wei-Jyun Université de Lorraine CNRS LCPME NancyF-54000 France Université de Lorraine CNRS IJL NancyF-54000 France Chemistry Department and Materials Science and Engineering Program Washington State University PullmanWA99164 United States The Gene and Linda Voiland School of Chemical Engineering and Bioengineering Washington State University PullmanWA99164 United States

Synthesized Fe@FeOx nanoparticles (NPs) were fully characterized by spectroscopic techniques and (scanning-)transmission electron microscopy to resolve the presence of iron hydroxide (Fe(OH)2). The different phases detected in the core-shell nanostructure of those nanoparticles were corroborated by Mössbauer and X-rays photoelectron spectroscopies. Metallic Fe0, Fe(OH)2, magnetite (FeIII2FeIIO4) and a top layer of ferric oxide were identified. Interestingly, Fe(OH)2 reacted with Pd2+aq upon coating of the supporting core-shell material with palladium to produce Fe@FeOx/Pd NPs. © 2022, The Authors. All rights reserved.

关键词： Shells (structures)

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Improving student's complex problem solving through LAPS-Talk-Ball learning integrated with interactive games 10

Improving student's complex problem solving through LAPS-Tal...

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10th International Conference and Workshop on High Dimensional Data Analysis, ICW-HDDA 2020

作者： Asfar, A.M.I.T. Asfar, A.M.I.A. Sulastri, S. Department of Mathematics Education STKIP Muhammadiyah Bone Abu Dg.Pasolong Street No.62 Watampone Indonesia Doctoral Program Science Education Universitas Negeri Makassar Bonto Langkasa street Makassar Indonesia Department of Chemical Engineering State Polytechnic of Ujung Pandang Tamalanrea Makassar Indonesia Department of Economics Education STKIP Muhammadiyah Bone Abu Dg.Pasolong Street No.62 Watampone Indonesia

One of the competencies needed currently is non-routine competency in solving a complex problem. Students with complex problem solving will be able to identify the complex problem, understand to review related information, and create solutions for the problems. However, the improvement of complex problem-solving abilities lacks attention. This phenomenon occurs when students are given problem-solving, students have not been able to understand the problem, plan solutions, and provide solutions to problems. To overcome these problems, the LAPS-Talk-Ball learning model integrated with interactive games that guide the students in solving problems was implemented by using interactive games and speech balloons to stimulate each student to express their ideas. This research is quantitative experimental research to determine the success of the LAPS-Talk-Ball learning model integrated with android-based interactive games in training complex problem-solving students using saturated sampling and non-equivalent control group research designs. From the results of gain test results high improvement category, which means that the LAPS-Talk-Ball learning model integrated with android-based interactive games can train the complex problem-solving abilities of students. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Students

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Stepwise construction of Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and magnetic separability for efficient visible-light photocatalysis

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Chinese chemical Letters 2020年第6期31卷 1598-1602页

作者： Zhijian Li Yao Wang Ahmed A.Elzatahry Xuanyu Yang Shouzhi Pu Wei Luo Xiaowei Cheng Yonghui Deng Department of Chemistry State Key Laboratory of Molecular Engineering of PolymersShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEMFudan University.Shanghai 200433China Jiangxi Key Laboratory of Organic Chemistry Jiangxi Science and Technology Normal UniversityNanchang 330013China Materials Science and Technology Program College of Arts and SciencesQatar UniversityDoha PO Box 2713Qatar State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Solid photocatalysts with high specific surface area,superior photoactivity and ease of recycling are highly desired in chemical process,water treatment and so *** this study,a facile stepwise sol-gel coating approach was utilized to synthesize Pt decorated oxygen-deficient mesoporous titania microspheres with core-shell structure and convenient magnetic separability(denoted as Fe3 O4@-SiO2@Pt/mTiO2-x).These photocatalysts consist of magnetic Fe3 O4 cores,nonporous insulating SiO2 middle layer and mesoporous anatase TiO2-x shell decorated by Pt nanoparticles(~3.5 nm)through wet impregnation and H2 *** a result of high activity of oxygen-deficiency of black TiO2-x by H2 reduction and efficient inhibition of electron-hole recombination by Pt nanoparticles,the rationally designed core-shell Fe3 O4@SiO2@Pt/mTiO2-x photocatalysts exhibit superior photocatalytic performance in rhodamine B(RhB)degradation under visible light irradiation,with more than 98%of RhB degraded within 50 *** core-shell structured photocatalysts show excellent recyclability under the assistance of magnetic separation with well-retained photocatalytic performance even after running five *** stepwise synthesis method paves the way for the rational design of a high-efficiency recyclable heterogeneous catalyst,including photocatalysts,for various applications.

关键词： Core-shell Mesoporous TiO2 Photocatalytic activity Magnetic recovery Visible light

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Synthesis, properties, and applications of graphene oxide/reduced graphene oxide and their nanocomposites

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Nano Materials science 2019年第1期1卷 31-47页

作者： Andrew T. Smith Anna Marie LaChance Songshan Zeng Bin Liu Luyi Sun Polymer Program Institute of Materials Science University of Connecticut Storrs Connecticut 06269 United States Department of Chemical and Biomolecular Engineering University of Connecticut Storrs Connecticut 06269 United States of Materials Science and Engineering Beijing University of Chemical Technology Beijing 100029 China Department of Biomedical Engineering University of Connecticut Storrs Connecticut 06269 United States

Thanks to their remarkable mechanical, electrical, thermal, and barrier properties, graphene-based nanocomposites have been a hot area of research in the past decade. Because of their simple top-down synthesis, graphene oxide (GO) and reduced graphene oxide (rGO) have opened new possibilities for gas barrier, membrane separation, and stimuli-response characteristics in nanocomposites. Herein, we review the synthesis techniques most commonly used to produce these graphene derivatives, discuss how synthesis affects their key material properties, and highlight some examples of nanocomposites with unique and impressive properties. We specifically highlight their performances in separation applications, stimuli-responsive materials, anti-corrosion coatings, and energy storage. Finally, we discuss the outlook and remaining challenges in the field of practical industrial-scale production and use of graphene-derivative-based polymer nanocomposites.

关键词： Graphene oxide Reduced graphene oxide Graphene quantum dots polymer Nanocomposites Synthesis Properties of graphene and graphene oxide Applications

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Quantum-Well Bound States in Graphene Heterostructure Interfaces

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Physical Review Letters 2021年第8期127卷 086805-086805页

作者： Zhongwei Dai (代中伟) Zhaoli Gao Sergey S. Pershoguba Nikhil Tiwale Ashwanth Subramanian Qicheng Zhang Calley Eads Samuel A. Tenney Richard M. Osgood Chang-Yong Nam Jiadong Zang A. T. Charlie Johnson Jerzy T. Sadowski Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA Department of Physics and Astronomy University of Pennsylvania Philadelphia Pennsylvania 19104 USA Department of Biomedical Engineering The Chinese University of Hong Kong Hong Kong China Department of Physics and Astronomy and Materials Science Program University of New Hampshire Durham New Hampshire 03824 USA Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook New York 11794 USA Department of Electrical Engineering Columbia University New York New York 10027 USA

We present experimental evidence of electronic and optical interlayer resonances in graphene van der Waals heterostructure interfaces. Using the spectroscopic mode of a low-energy electron microscope (LEEM), we characterized these interlayer resonant states up to 10 eV above the vacuum level. Compared with nontwisted, AB-stacked bilayer graphene (AB BLG), an ≈0.2 Å increase was found in the interlayer spacing of 30° twisted bilayer graphene (30°-tBLG). In addition, we used Raman spectroscopy to probe the inelastic light-matter interactions. A unique type of Fano resonance was found around the D and G modes of the graphene lattice vibrations. This anomalous, robust Fano resonance is a direct result of quantum confinement and the interplay between discrete phonon states and the excitonic continuum.

关键词： Electronic structure Graphene Heterostructures Low-energy electron microscopy Raman spectroscopy

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Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon Coupling in Hybrid Organic-Inorganic Perovskites

Nanoslot-Induced Ultrastrong Phonon-Photon and Phonon-Phonon...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Dasom Kim Jin Hou Geon Lee Ayush Agrawal Sunghwan Kim Hao Zhang Di Bao Andrey Baydin Wenjing WU Fuyang Tay Shengxi Huang Daivd Hagenmüller Elbert E. M. Chia Dai-Sik Kim Minah Seo Aditya D. Mohite Junichiro Kono Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX USA Department of Electrical and Computer Engineering Rice University Houston TX USA Department of Materials Science and NanoEngineering Rice University Houston TX USA Sensor System Research Center Korea Institute of Science and Technology Seoul Republic of Korea Department of Physics and Astronomy Seoul National University Seoul Republic of Korea Department of Chemical and Biomolecular Engineering Rice University Houston TX USA Department of Physics Long-wavelength Nanotechnology Laboratory Quantum Photonics Institute Ulsan National Institute of Science and Technology (UNIST) Ulsan Republic of Korea Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Smalley-Curl institute Rice University Houston TX USA CESQ-ISIS (UMR 7006) Universite de Strasbourg and CNRS Strasbourg France KU-KIST Graduate School of Converging Science and Technology Korea University Seoul Republic of Korea Department of Physics and Astronomy Rice University Houston TX USA

Methods for harnessing vibrational states are desired for phonon-based technologies. We realized ultrastrong coupling of two phonon modes in perovskite materials induced by ultrastrong coupling with a common photonic ... 详细信息

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Couplings Phonons Laser modes Perovskites Electro-optical waveguides Photonics

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Degradation of ciprofloxacin by electrochemically assisted peroxydisulfate activation with core-shell CoFe 2 O 4 /CoFe@C particle electrodes and RVC cathode: Synergistic performance, environmental applicability, and toxicity evaluation

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Separation and Purification Technology 2025年 376卷

作者： Zhongda Liu Alexandros K. Bikogiannakis Frédéric Lynen Deirdre Cabooter Georgios Kyriakou Zacharias Frontistis Raf Dewil Dionissios Mantzavinos Alexandros Katsaounis Department of Chemical Engineering University of Patras Caratheodory 1 St 26504 Patras Greece Laboratory for Pharmaceutical analysis Department of Pharmaceutical and Pharmacological Sciences KU Leuven Herestraat 49 box 824 3000 Leuven Belgium Separation Science Group Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4bis B-9000 Ghent Belgium Chemical Engineering Department University of Western Macedonia GR-50132 Kozani Greece KU Leuven Department of Chemical Engineering Process and Environmental Technology Lab Sint-Katelijne-Waver Belgium University of Oxford Department of Engineering Science Parks Road Oxford OX1 3PJ United Kingdom

Ciprofloxacin (CIP), an emerging pollutant, poses significant risks to aquatic ecosystems and human health due to its persistence, bioaccumulation, and antimicrobial properties. In this study, a hybrid electrochemically assisted heterogeneous peroxydisulfate (PDS) activation process was developed to address this challenge. This process combines a magnetic core–shell carbon-encapsulated cobalt ferrite (CoFe 2 O 4 /CoFe@C) particle electrode with a reticulated vitreous carbon (RVC) cathode. The interaction between the oxide core and carbon shell forms a zero-valent CoFe interlayer in the particle electrode. The RVC cathode utilizes cathodic electrons to generate in situ H 2 O 2 for degradation. Under electric field, surface-bound and leached metal species from the particle electrode are electrochemically reduced to lower valent states, thereby enhancing the activation of PDS and H 2 O 2 . Consequently, 95.5% of CIP was removed in 10 min, with a high rate constant (0.309 min −1 ) and a low energy consumption (0.31 kWh/m 3 /order). Key process parameters, including current density, catalyst dosage, PDS and CIP concentrations, and initial pH, were examined. Different co-existing ions, water matrices and pollutants were also evaluated for applicability. The magnetically separated catalyst can be reused for multiple cycles. Quenching, probing and electrochemical tests suggested OH, O 2 − , and 1 O 2 as the main reactive species. Moreover, the degradation pathway was proposed based on density functional theory (DFT) results and 15 degradation products identified by HPLC-MS. The in silico methods using ECOSAR and TEST programs showed a general decrease in toxicity of the degradation products. In summary, this study provides an efficient solution for emerging pollutant removal with enhanced environmental sustainability.

关键词： Ciprofloxacin Degradation Electro-activation Particle electrode Peroxydisulfate Reticulated vitreous carbon

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Imaging Ionic Aggregates in Zn-Neutralized Sulfonated Polystyrene Ionomers: Shape and Spatial Heterogeneity

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Microscopy and Microanalysis 2020年第S2期6卷 1112-1113页

作者： Brian P. Kirkmeyer Robert A. Weiss Karen I. Winey Department of Materials Science and Engineering University of Pennsylvania Philadelphia Pennsylvania19104- 6272 Polymer Science Program and Department of Chemical Engineering University of Connecticut Storrs Connecticut06269-3136

Ionomers are ionically-associating copolymers whose distinctive rheological and mechanical properties arise from the formation of ionic aggregates. The ionic aggregates form when dipoles of minority anionic polymer backbone segments and cationic neutralizing species locally associate and dissociate among each other. Specific ionomer properties depend upon the base copolymer, the minority constituent and the neutralizing agent. One system that has been studied extensively is sulfonated polystyrene ionomer neutralized with Zn (Zn-SPS). The most common technique to date for studying ionomer morphology is small-angle x-ray scattering (SAXS). This technique has provided quantitative information about the aggregate morphology by imposing morphology models that have not been independently *** the present study, we demonstrate the capability to directly image the ionic aggregates of Zn-SPS ionomers using scanning transmission electron microscopy (STEM). This method will allow us to confirm or deny the competing morphological models applied to SAXS data. We have applied similar methods to polyethylene-based ionomers.

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Advances in virus detection methods for wastewater-based epidemiological applications

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Case Studies in chemical and Environmental engineering 2022年 6卷 100238页

作者： Corpuz, Mary Vermi Aizza Buonerba, Antonio Zarra, Tiziano Hasan, Shadi W. Korshin, Gregory V. Belgiorno, Vincenzo Naddeo, Vincenzo Environmental Engineering Program National Graduate School of Engineering University of the Philippines 1101 Diliman Quezon City Philippines Department of Chemistry and Biology “Adolfo Zambelli” University of Salerno Via Giovanni Paolo II-132 Fisciano 84084 Italy Sanitary Environmental Engineering Division (SEED) Department of Civil Engineering University of Salerno Via Giovanni Paolo II-132 Fisciano 84084 Italy Department of Chemical Engineering Khalifa University of Science and Technology P.O. Box 127788 Abu Dhabi United Arab Emirates Department of Civil and Environmental Engineering University of Washington Box 352700 Seattle 98105-2700 WA United States

Wastewater-based epidemiology (WBE) is a powerful tool that has the potential to reveal the extent of an ongoing disease outbreak or to predict an emerging one. Recent studies have shown that SARS-CoV-2 concentration in wastewater may be correlated with the number of COVID-19 cases in the corresponding population. Most of the recent studies and applications of wastewater-based surveillance of SARS-CoV-2 applied the “gold standard” real-time quantitative reverse transcription-polymerase chain reaction (RT-qPCR) detection method. However, this method also has its limitations. The paper aimed to present recent improvements and applications of the PCR-based methods for SARS-CoV-2 monitoring in wastewater. Furthermore, it aimed to review alternative methods utilized and/or proposed for the detection of the virus in wastewater matrices. From the review, it was found that several studies have investigated the use of reverse-transcription digital polymerase reaction (RT-dPCR), which was generally shown to have a lower limit of detection (LOD) over the RT-qPCR. Aside from this, non-PCR-based and non-RNA based methods have also been explored for the detection of SARS-CoV-2 in wastewater, with detailed attention given to the detection of SARS-CoV-2 proteins. The potential methods for protein detection include mass spectrometry, the use of immunosensors, and nanotechnological applications. In addition, the review of recent studies also revealed two types of emerging methods related to the detection of SARS-CoV-2 in wastewater: i) capsid-integrity assays to infer about the infectivity of SARS-CoV-2 present in wastewater, and ii) alternative methods for detection of SARS-CoV-2 variants of concern (VOCs) in wastewater. The recent studies on proposed methods of SARS-CoV-2 detection in wastewater have considered improving this approach in one or more of the following aspects: rapidity, simplicity, cost, sensitivity, and specificity. However, further studies are needed in order to re

关键词： Capsid integrity Digital polymerase reaction SARS-CoV-2 detection SARS-CoV-2 protein Variants of concern Wastewater-based epidemiology

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CoAl2O4 nanoparticles modified carbon nanofibers as high-efficiency bifunctional electrocatalyst: An efficient electrochemical aqueous asymmetric supercapacitors and non-enzymatic electrochemical sensors

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Journal of Alloys and Compounds 2023年 931卷 1页

作者： Chinnapaiyan, Sathishkumar Das, Himadri Tanaya Chen, Shen-Ming Govindasamy, Mani Alshgari, Razan A. Fan, Chi-Hsuan Huang, Chi-Hsien Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei10608 Taiwan Centre for Advanced Materials and Applications Utkal University Vani vihar Odisha Bhubaneswar751004 India Department of Materials Engineering Ming Chi University of Technology New Taipei City243303 Taiwan International Ph.D. Program in Innovative Technology of Biomedical Engineering and Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan Chemistry Department College of Science King Saud University Riyadh11451 Saudi Arabia Korea University of Technology and Education Chungcheongnam-do Cheonan-si31253 Korea Republic of Division of Rheumatology Allergy and Immunology Chang Gung Memorial Hospital Taoyuan33378 Taiwan Research Center for Intelligent Medical Devices Ming Chi University of Technology New Taipei City243303 Taiwan

The thriving energy demand of the gradually increasing population and modernized life style requires development in energy storage devices for usage in commercial electronic devices. In this particular work, we have explored electrochemical performances of bimetallic oxide CoAl2O4 and tuned its performance by decorating it on the carbon nanofibers. The CoAl2O4/CNFs are synthesized by deep eutectic solvents based hydrothermal method. The synthesized CoAl2O4 nanoparticle was found electrochemically active and the incorporation of CNFs end up boosting, its electrochemical performances as battery-type electrode. The obtained nanocomposites were characterized by various techniques. The electrochemically active CoAl2O4/CNFs exhibited 2.2-fold higher charge storage capacity than CoAl2O4. The CoAl2O4/CNFs exhibited specific capacity as high as 132 C/g at a constant applied current density of 1 A/g in 1 M KOH. The asymmetric device fabricated with CoAl2O4/CNFs electrodes exhibited excellent energy density of 20 Wh/kg at power density of 3000 W/kg. The CoAl2O4/CNFs electrode long-term stability has been minutely observed;the high Coulombic efficiency of 90% and high rate of capacity retention 95 %. In this work, an enzyme-free electrochemical sensor based on CoAl2O4/CNFs composite was developed for the detection of luteolin (LUT). Further modification of CoAl2O4/CNFs composite can improve the high surface area and catalytic capability of the composites. Under the optimal detection conditions, the prepared sensor has good linearity in the detection of LUT within range 30 nM − 73.5 μM with a limit of detection (LOD) of 0.0124 μM (12.4 nM). The stability and selectivity of the sensor is high, and can be used to detect LUT in various real samples. © 2022 Elsevier B.V.

关键词： Electrochemical sensors

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