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Nitrogen and sulfur dual-doped high-surface-area hollow carbon nanospheres for efficient CO2 reduction

Chinese Journal of Catalysis 2020年第5期41卷 830-838页

作者： Guodong Li Yongjie Qin Yu Wu Lei Pei Qi Hu Hengpan Yang Qianling Zhang Jianhong Liu Chuanxin He Department of Chemical Physics University of Science and Technology of ChinaHefei 230026AnhuiChina Shenzhen Key Laboratory for Functional Polymer College of Chemistry and Environmental EngineeringShenzhen UniversityShenzhen 518060GuangdongChina

The electrochemical reduction of CO2(CO2 RR) can substantially contribute to the production of useful chemicals and reduction of global CO2 emissions. Herein, we presented N and S dual-doped high-surface-area carbon materials(SZ-HCN) as CO2 RR catalysts. N and S were doped by one-step pyrolysis of a N-containing polymer and S powder. ZnCl2 was applied as a volatile porogen to prepare porous SZ-HCN. SZ-HCN with a high specific surface area(1510 m2 g–1) exhibited efficient electrocatalytic activity and selectivity for CO2 RR. Electrochemical measurements demonstrated that SZ-HCN showed excellent catalytic performance for CO2-to-CO reduction with a high CO Faradaic efficiency(~93%) at-0.6 V. Furthermore, SZ-HCN offered a stable current density and high CO selectivity over at least 20 h continuous operation, revealing remarkable electrocatalytic durability. The experimental results and density functional theory calculations indicated that N and S dual-doped carbon materials required lower Gibbs free energy to form the COOH* intermediate than that for single-N-doped carbon for CO2-to-CO reduction, thereby enhancing CO2 RR activity.

关键词： High specific surface area Hollow structure Carbon-based catalysts CO2 reduction reaction Electrocatalytic selectivity

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Efficient and Homogenous Precipitation of Sulfur Within a 3D Electrospun Heterocatalytic Rutile/Anatase TiO_(2‑x) Framework in Lithium–Sulfur Batteries

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Advanced Fiber Materials 2024年第3期6卷 810-824页

作者： Ping Feng Kang Dong Yaolin Xu Xia Zhang Haojun Jia Henrik Prell Michael Tovar Ingo Manke Fuyao Liu Hengxue Xiang Meifang Zhu Yan Lu Institute of Electrochemical Energy Storage Helmholtz-Zentrum Berlin für Materialien und Energie14109 BerlinGermany Department of Chemistry Massachusetts Institute of TechnologyCambridgeMA 02139USA Department Structure and Dynamics of Energy Materials Helmholtz-Zentrum Berlin für Materialien und Energie GmbH14109 BerlinGermany State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620People’s Republic of China Institute for Technical and Environmental Chemistry Friedrich-Schiller-Universit.t Jena07743 JenaGermany Helmholtz Institute for Polymers in Energy Applications Jena(HIPOLE Jena) 07743 JenaGermany

Lithium–sulfur(Li–S)batteries can potentially outperform state-of-the-art lithium-ion batteries,but their further development is hindered by challenges,such as poor electrical conductivity of sulfur and lithium sulfide,shuttle phenomena of lithium polysulfides,and uneven distribution of solid reaction ***,free-standing carbon nanofibers embedded with oxygen-deficient titanium dioxide nanoparticles(TiO_(2-x)/CNFs)has been fabricated by a facile electrospinning method,which can support active electrode materials without the need for conductive carbon and *** carefully controlling the calcination temperature,a mixed phase of rutile and anatase was achieved in the TiO_(2-x)*** hybridization of anatase/rutile TiO_(2-x)and the oxygen vacancy in TiO_(2-x)play a crucial role in enhancing the conversion kinetics of lithium polysulfides(LiPSs),mitigating the shuttle effect of LiPSs,and enhancing the overall efficiency of the Li–S battery ***,the free-standing TiO_(2-x)/CNFs facilitate uniform deposition of reaction products during cycling,as confirmed by synchrotron X-ray *** a result of these advantageous features,the TiO_(2-x)/CNFs-based cathode demonstrates an initial specific discharge capacity of 787.4 mAh g^(−1)at 0.5 C in the Li–S coin cells,and a final specific discharge capacity of 584.0 mAh g^(−1) after 300 ***,soft-packaged Li–S pouch cells were constructed using the TiO_(2-x)/CNFs-based cathode,exhibiting excellent mechanical properties at different bending *** study presents an innovative approach to developing free-standing sulfur host materials that are well suited for flexible Li–S batteries as well as for various other energy applications.

关键词： Li–S batteries TiO_(2-x) Electrospinning Heterocatalyst X-ray tomography

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Xenon Collection and Separation from Atmospheric Air in Silver-Exchanged Zeolites, Activated Carbon and Metal-Organic Frameworks

SSRN

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SSRN 2023年

作者： Gueibe, Christophe Rutten, Jos Camps, Johan Moyaux, Dominique Schroeyers, Wouter Plenteda, Romano Hermanspahn, Nikolaus Minta, Daria Schreurs, Sonja Boeretang 200 Mol2400 Belgium Centre for Environmental Sciences Avenue de l’Espérance 1 Fleurus6220 Belgium Vienna International Centre PO Box 1200 Vienna1400 Austria Wroclaw University of Science and Technology Department of Process Engineering and Technology of Polymer and Carbon Materials ul. Gdańska 7/9 Wroclaw50-344 Poland

More efficient adsorbents for Xe collection and separation from air could provide new alternatives for cost-efficient production of stable Xe as well as for trace measurements of atmospheric radioxenon. Silver-exchanged Zeolites (AgZs) have been reported to be more efficient than Activated Carbon (AC) in collecting Xe at low pressures and room temperature but never for Xe collection from air. Metal-Organic Frameworks (MOFs) have been reported for high Xe/Kr selectivities in Xe and Kr enriched gas streams but never for Xe collection from air either. Two AgZs (Ag-ETS-10 and Ag-ZSM-5), two MOFs (HKUST-1 and Ni-DOBDC) and one AC (Nusorb® GXK) are compared to determine their potential for collecting and separating Xe from air. The acquired adsorbent samples were characterized (by SEM, PXRD, TGA, N2 adsorption at 77 K and CO2 adsorption at 273 K) and the results are in agreement with observations made previously in the literature. Both AgZs show an unprecedented Xe adsorption capacity in N2 at 13.5 mPa (approximately the Xe partial pressure in air) and room temperature with 0.15 and 0.13 mmol/kg for Ag-ETS-10 and Ag-ZSM-5, respectively. This high Xe adsorption capacity at low Xe concentration holds in dry air. Both AgZs have a high Xe selectivity over the major gas components in air at room temperature and they also show an unprecedented Xe selectivity over Kr of 1300 and 470 for Ag-ETS-10 and Ag-ZSM-5, respectively. Finally, it is possible to separate Xe from O2, Ar, CO2, Kr and Rn efficiently in both AgZs but it requires temperatures up to 521 K. The results clearly demonstrate that both AgZs investigated in this work are globally outperforming all other adsorbents for collecting and separating Xe from air. The only limitation found for the moment on these AgZs is the strong co-adsorption of moisture that significantly reduces the Xe collection at 50% R.H. © 2023, The Authors. All rights reserved.

关键词： Adsorption

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Single-Stranded DNA Recognition Over Fluorescent Gold-Aryl Nanoparticles

SSRN

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SSRN 2022年

作者： Parambath, Javad B.M. Kanu, Gayathri A. Abu Odeh, Raed O. Kim, Sanghyun Han, Changseok Mohamed, Ahmed A. Department of Chemistry College of Sciences University of Sharjah Sharjah27272 United Arab Emirates Center for Advanced Materials Research Research Institute of Sciences and Engineering University of Sharjah Sharjah27272 United Arab Emirates Department of Medical Laboratory Sciences College of Health Sciences University of Sharjah Sharjah27272 United Arab Emirates Program in Environmental & Polymer Engineering Graduate School INHA University Incheon Korea Republic of Department of Environmental Engineering 100 Inha-ro Michuhol-gu INHA University Incheon Korea Republic of

Fluorescence labeling of gold-aryl nanoparticles, AuNPs-COOH, was achieved by the covalent derivatization with dansyl chloride (DNS-Cl) reagent (5-naphthalene-1-sulfonyl chloride) for potential ssDNA recognition. The fluorescent gold nanoparticles of AuNPs-C6 H4 -4-COO-dansyl (AuNPs-DNS) of spherical shape and size of 19.3 ± 8.3 nm were synthesized in carbonate-bicarbonate buffer (pH = 10.6) at room temperature. The fluorescence emission at 475 nm was acquired using fluorescence spectroscopy and investigated using time-resolved photoluminescence. The conjugation of ssDNA to AuNPs-DNS using freeze-thaw and salt-aging methods was confirmed by fluorescence emission quenching, gel electrophoresis separation, and lifetime decrease. Conjugated ssDNA to AuNPs-DNS using the freeze-thaw method was more efficient than salt-aging. The purity of ssDNA upon conjugation was measured by optical density and the obtained A260 /A280 ratio was in the range of 1.7–2.0. This research can be applied to other nucleotides recognition and theranostics. © 2022, The Authors. All rights reserved.

关键词： Fluorescence

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Surface Pegylation of Pan Membrane Via Cationic Photopolymerization for Enhanced Antifouling, Hemocompatibility and Separation Performance

SSRN

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SSRN 2022年

作者： Wen, Shaobin Wang, Yan Zhang, Jingyu Fan, Liyuan Zhang, Qiang Deng, Yufei Xin, Yangyang Zou, Yingquan Key Laboratory of New Membrane Materials Ministry of Industry and Information Technology School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Institute of Polymer Ecomaterials School of Environmental and Biological Engineering Nanjing University of Science and Technology Nanjing210094 China Hubei Gurun Technology Co. Ltd. Jingmen448000 China Department of Applied Chemistry College of Chemistry Beijing Normal University Beijing100875 China

Poly(acrylonitrile) (PAN) is one of the most widely-used membrane materials. However, its high hydrophobicity and low biocompatibility lead to relatively poor anti-fouling and hemocompatibility of membrane. Herein, surface PEGylation of PAN membrane is conducted to enhance its antifouling, hemocompatibility and separation performance. Rapid cationic photopolymerization of poly(ethylene glycol) (PEG) with terminal oxetane groups could generate a cross-linked PEG network on the membrane surface. The structure and separation performance of membrane could be regulated by adjusting the molecular weight of PEG and the UV radiation time. The hydrophilicity of membrane has been significantly enhanced due to the PEGylation. Compared with pristine PAN membrane, the adsorption of BSA on PAN/PEG 200 decreased from 42.3 μg cm−2 to 13.38 μg cm−2 and it had higher flux recovery after filtering the BSA solution. The hemocompatibility of PEGylated membrane also improved, including anti-adsorption to platelet and erythrocyte, low hemolysis rate (~1%) and prolonged plasma coagulation time (~12 min). PEGylated membrane also showed excellent fractionation performance to dye/salt with the rejection of 98.4% to CBB and only 8.0% to NaCl. The membrane has shown superior chlorine resistance, with flux and retention remaining stable over a 14-day test. The PEGylation by cationic photopolymerization in this research is fast and facile, which may have potential application in the fabrication of antifouling and biocompatible membranes. © 2022, The Authors. All rights reserved.

关键词： Polyethylene glycols

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Thermo-sensitive Microgels Supported Gold Nanoparticles as Temperature-mediated Catalyst

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Chinese Journal of polymer science 2019年第3期37卷 235-242页

作者： Xian-Jing Zhou Hai-Peng Lu Ling-Li Kong Dong Zhang Wei Zhang Jing-Jing Nie Jia-Yin Yuan Bin-Yang Du Xin-Ping Wang Department of Chemistry Zhejiang Sci-Tech University Department of Chemistry Zhejiang University Department of Materials and Environmental Chemistry Stockholm University Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science & Engineering Zhejiang University

Microgels with a thermo-sensitive poly(N-isopropylacrylamide)(polyNIPAm) backbone and bis-imidazolium(VIM) ionic cross-links, denoted as poly(NIPAm-co-VIM), were successfully prepared. The as-synthesized ionic microgels were converted to nanoreactors, denoted as Au@PNI MGs, upon generation and immobilization of gold nanoparticles(Au NPs) of 5–8 nm in size into poly(NIPAm-co-VIM). The content of Au NPs in microgels could be regulated by controlling the 1,6-dibromohexane/vinylimidazole molar ratio in the quaternization reaction. The microgel-based nanoreactors were morphologically spherical and uniform in size, and presented reversible thermo-sensitive behavior with volume phase transition temperatures(VPTTs) at 39–40 °C. The Au@PNI MGs were used for the reduction of 4-nitrophenol, of which the catalytic activity could be modulated by temperature.

关键词： Microgel Thermo-sensitive Gold nanoparticle Catalyst

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Silane-coupled kenaf fiber filled thermoplastic elastomer based on recycled high density polyethylene/natural rubber blends

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Polimeros 2021年第2期31卷

作者： Viet, Cao Xuan Ismail, Hanafi Masa, Abdulhakim Hayeemasae, Nabil Department of Polymer Materials Faculty of Materials Technology Ho Chi Minh City University of Technology - HCMUT Ho Chi Minh City Viet Nam School of Materials and Mineral Resources Engineering Universiti Sains Malaysia Engineering Campus Nibong Tebal Penang Malaysia Rubber Engineering and Technology Program International College Prince of Songkla University Hat Yai Songkhla Thailand Department of Rubber Technology and Polymer Science Faculty of Science and Technology Prince of Songkla University Pattani Campus Pattani Thailand

A silane coupling agent, namely γ-aminopropyltriethoxysilane (APS), was used to modify kenaf powder (KP). It was then used as filler in a thermoplastic elastomer (TPE) based on Recycled High Density Polyethylene/Natural Rubber Blends (rHDPE/NR). The attachment of silane onto KP was verified by Fourier Transform Infrared Spectroscopy (FTIR), while the performance of the TPE was assessed in terms of mechanical and thermal properties. The results revealed that specific functional groups of APS were efficiently grafted onto the KP. Tensile strength was improved by the modification with silane and this also affected Young's modulus of the TPE. Also, improved thermal stability was confirmed by thermogravimetric analysis (TGA), as the degradation temperature increased upon inclusion of silane. These effects are attributed to improved compatibility of the KP and rHDPE/NR blend. Such compatibilizing effect was confirmed by Differential Scanning Calorimetry (DSC) that indicated significantly increased crystallinity after the modification with silane. © 2021 Associacao Brasileira de Polimeros. All rights reserved.

关键词： Rubber

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A concise tutorial review of Reverse Osmosis and Electrodialysis

arXiv

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arXiv 2021年

作者： Biesheuvel, P.M. Porada, S. Elimelech, M. Dykstra, J.E. Wetsus European Centre of Excellence for Sustainable Water Technology Leeuwarden Netherlands Department of Process Engineering and Technology of Polymer and Carbon Materials Wroclaw University of Science and Technology Poland Department of Chemical and Environmental Engineering Yale University New HavenCT United States Environmental Technology Wageningen University Netherlands

Reverse osmosis (RO) and electrodialysis (ED) are the two most important membrane technologies for water desalination and treatment. Their modes of operation and transport mechanisms are very different, but on a closer look also have many similarities. In this concise version of our tutorial review, we describe state-of-the-art theory for both processes, focusing on simple examples that are helpful for the non-specialist and useful for classroom teaching. Both processes are described by the solution (SF) theory which combines ion and water transport across membranes with chemical and mechanical equilibrium at membrane/solution interfaces. We present a derivation of SF theory based on force balances on water and ions and show how the various terms, convection, diffusion, and electromigration, are derived, and how solute partitioning is implemented. Finally, we demonstrate how SF theory accurately describes the osmosis experiment where water and ions are transported in opposite directions across a membrane. Copyright © 2021, The Authors. All rights reserved.

关键词： Reverse osmosis

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The potential of pervaporation for biofuel recovery from fermentation:An energy consumption point of view

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Chinese Journal of Chemical engineering 2019年第6期27卷 1296-1306页

作者： Peiyao Zheng Chong Li NaixinWang Jie Li Quanfu An MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science&EngineeringZhejiang UniversityHangzhou 310027China Beijing Key Laboratory for Green Catalysis and Separation College of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

Recovering alcohols from dilute fermentation broth is an emergent task in bio-fuel production process. Since they are primary planned for fuels, energy required to separate these alcohols should be considered in evaluating the potential of a separation technology. A membrane-based process, pervaporation, is of special interest because of its environmental friendliness and easy integrating character. This review probes into the fundamentals of pervaporation especially in terms of the heat required for evaporation. Meanwhile, the separation data of the most representative alcohol-selective pervaporation membranes reported in the literatures are collected and compared with the vapor–liquid equilibrium curve, which represents the distillation selectivity. They include:inorganic membranes, silicon rubber based membranes, Mixed Matrix Membranes and some other special materials. By doing so, the status of alcohol recovery via pervaporation would be more clear for *** ethanol recovery, it is selectivity rather than flux that is in urgent need of solution. While for butanol recovery,membranes with satisfactory selectivity have been developed, increasing the separation capacity would be more pressing.

关键词： Bio-alcohol Pervaporation Energy Selectivity Vapor-liquid equilibrium

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Novel Membranes Regenerated from Blends of Cellulose/Gluten Using Ethylenediamine/Potassium Thiocyanate Solvent System

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Journal of Renewable Materials 2019年第1期7卷 41-55页

作者： Yang Yu Ramiz Boy Richard Kotek Fiber and Polymer Science Program College of TextilesNorth Carolina State UniversityRaleighNC 27606USA Department Textile Engineering Çorlu Faculty of EngineeringTekirdağNamık Kemal UniversityTekirdağ59860TURKEY

Current industrial methods for dissolution of cellulose in making regenerated cellulose products are relatively expensive,toxic and dangerous and have environmental problems coming with the hazard chemical *** solve these problems,a novel ethylenediamine and potassium thiocyanate(ED/KSCN)solvent system was developed,that is economical,ecofriendly,and highly *** ED/KSCN solvent system was proven to be a suitable solvent for fabricating cellulose(blended with other polymers)*** this study,gluten was used to develop nonporous membranes with *** method of casting these membranes provided better ones than the former researchers’*** composite membranes’physical and mechanical properties were studied by analysis of morphology,viscosity,crystallinity,thermal behaviors,tensile properties and water absorption of *** showed that membranes are nonporous,uniform,strong,flexible,ecofriendly and *** and physical properties were influenced by the ratio of cellulose/*** blending 40% gluten,the tensile strength of cellulose membrane dropped to 15.89 MPa from 35.11 ***,its elongation at break increased from 35.3% to 57.02% accordingly.

关键词： Cellulose gluten blended film novel ED/KSCN solvent physical and mechanical properties

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