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Effects of sulfonation degree on compatibility and separation performance of polybenzimidazole (PBI)-sulfonated polyphenylenesulfone (sPPSU) blend membranes

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Journal of Membrane science 2023年 683卷

作者： Beshahwored, Siyum Shewakena Weber, Martin Hu, Chien-Chieh Lai, Juin-Yih Chung, Tai-Shung Graduate Institute of Applied Science and Technology National Taiwan University of Science and Technology Taipei10607 Taiwan Performance Polymers BASF SE PMD/GS-B001 Ludwigshafen67056 Germany Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan32023 Taiwan Department of Chemical Engineering Taipei10607 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Chemical & Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore

The molecular compatibility between polybenzimidazole (PBI) and sulfonated polyphenylsulfone (sPPSU) and their blend membranes for herbicide removal in water reuse and for drug separation in organic solvent nanofiltration (OSN) have been investigated as a function of sulfonation degree in sPPSU. Flat sheet membranes cast from PBI-sPPSU blends with a mass ratio of 1:1 were prepared and then crosslinked by trimesoyl chloride (TMC) at room temperature. The blend made of PBI and 12.7 mol% sPPSU showed high compatibility based on the calculated enthalpy of mixing (ΔHm), measured dope viscosity, phase diagram, and single Tg. The TMC modified membrane cast from this composition also exhibited higher chemical resistance, mechanical stability, narrower pore size and pore size distribution, macrovoid-free structure and better separation performance. All fabricated membranes were evaluated using feeds containing tetracycline (MW = 444 Da) as a model drug in ethanol and pendimethalin (MW = 281.3 Da) as a model herbicide in water. The crosslinked PBI-12.7 mol% sPPSU (12.7C) membrane exhibited rejection of >96% against low-molecular-weight pendimethalin from water and tetracycline from ethanol. It also has the capability to separate mixed solutes, even with small molecular weights. This study illustrates the effectiveness of highly compatible polymer blends with the aid of one-step cross-linking modification for nanofiltration. © 2023 Elsevier B.V.

关键词： Nanofiltration

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Comparative Study of Catalytic Conversion of Glucose Over Γ-Alumina Supported Tungsten Oxide Catalysts with Controlling Acidity

SSRN

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SSRN 2024年

作者： Cho, Yunhye Tran, Linh Mai Park, Sung Joon Min, Hyung-Ki Park, Min Bum Innovation Center for Chemical Engineering Department of Energy and Chemical Engineering Incheon National University Incheon22012 Korea Republic of Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Lotte Chemical R&D Center Daejeon34110 Korea Republic of Hydrogen & C1 Gas Research Center Korea Research Institute of Chemical Technology Daejeon34114 Korea Republic of

For the advancement of sustainable energy systems, biomass holds the potential to become a primary energy source worldwide. Glucose is one of the most economical and abundant carbohydrates, which can be converted to more value-added chemical feedstock. Here, a series of tungsten oxide catalysts supported on γ-alumina with varying tungsten content were synthesized using the wet impregnation method, and applied on the glucose conversion. The physicochemical properties of the prepared catalysts were investigated through powder X-ray diffraction, N2 sorption, scanning electron microscopy, UV-diffuse reflectance spectroscopy, and Raman spectroscopy. Pyridine-adsorption IR analysis was conducted to elucidate the acidic properties of the catalysts. As the loaded tungsten content increased, the concentration of Brønsted acid sites increased while the Lewis acid sites exhibited a decreasing trend. By controlling the acid concentration by the tungsten content, it was possible to adjust the optimal glucose conversion and the product selectivity in this cascade chemical reaction. © 2024, The Authors. All rights reserved.

关键词： Glucose

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The analysis of characterization of zeolite modified from fly ash using iron oxide and manganese oxide 7

The analysis of characterization of zeolite modified from fl...

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7th International Conference on Advanced Materials for Better Future, ICAMBF 2022

作者： Saputro, S. Mahardiani, L. Masykuri, M. Yamtinah, S. Solikah, A.A. Yuanitama, A.L. Romantika, H.R. Azizah, I.N. Amri, A. Doctorate Program of Science Education Faculty of Teacher Training and Education Universitas Sebelas Maret Surakarta57126 Indonesia Chemistry Education Department Faculty of Teacher Training and Education Universitas Sebelas Maret Surakarta57126 Indonesia Department of Chemical Engineering University of Riau Pekanbaru28293 Indonesia

Fly ash is the residue from burning coal in the form of fine and light particles and can be harmful to the environment and life. Whereas fly ash contains high silica so that it can be used as a precursor for zeolite blinding. Zeolite as an adsorbent for aquatic waste needs to be improved so that it can absorb more adsorbate. Therefore, it is necessary to modify the zeolite from fly ash, such as coating with manganese and iron oxide. The zeolite is made from fly ash extraction and synthesize using hydrothermal method. In this study, it was found that fly ash contains about 45.20% silica and the synthetic zeolite was successfully coated with manganese and iron oxide evidenced by the results of FTIR and XRD. This is indicated by the presence of manganese oxide at an absorption of 453.29 cm-1 using FTIR and manganese oxide on XRD aimed at 2θ = 37.356°;47.337°;51,879°;57.966°;61.822° and 67.5552°. Meanwhile, the FTIR results of iron oxide were indicated by the presence of an absorption band at 447.50 cm-1 and XRD diffraction peaks at 2θ = 30,643° and 2θ = 60,322°. © Published under licence by IOP Publishing Ltd.

关键词： Fly ash

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Electrodialysis for Efficient Antisolvent Recovery in Precipitation of Critical Metals and Lithium-Ion Battery Recycling

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SSRN 2024年

作者： Solberg, Simon Birger Byremo Gómez-Coma, Lucía Wilhelmsen, Øivind Forsberg, Kerstin Burheim, Odne S. Norwegian University of Science and Technology Department of Energy and Process Engineering Høgskoleringen 1 TrondheimNO-7491 Norway Department of Chemistry Norwegian University of Science and Technology Høgskoleringen 1 TrondheimNO-7491 Norway KTH Royal Institute of Technology Department of Chemical Engineering Teknikringen 42 Stockholm114 28 Sweden University of Cantabria Department of Chemical and Biomolecular Engineering Av. Los Castros 46 Santander39005 Spain

It has proven effective to recover metal compounds from aqueous mixtures by use of antisolvents;organic compounds that induce selective precipitation. A challenge with antisolvents is that they are both costly to produce and recover on an industrial scale. In recycling of lithium-ion batteries and recovering critical metals, we find that electrodialysis can be a competitive method for purifying and recycling antisolvents. In this study we investigate the use of electrodialysis to separate salt and water from a ternary solution of water, KCl and ethanol. A coupled non-equilibrium electrochemical model is developed to understand how such systems may be operated, designed, and which characteristics that are required for the ion exchange membranes. We demonstrate how the water transference coefficients of the membranes should be tuned in the process optimisation and why membrane property design is crucial to the success of this concept. Residual mixtures from antisolvent precipitation, with ethanol (EtOH) solvent weight fractions around 0.6-0.7, can be demineralised and the EtOH fraction increased by 0.1-0.2 at an energy requirement of 60-200 kWh m-3EtOH by use of electrodialysis. In an example application of the concept, aqueous KCl is precipitated by recycled ethanol in a cyclic process, requiring 0.161 kWh mol-1KCl. This example case considers complete ethanol rejection by the membranes and abundant water co-transport, characterised by the transference coefficients: tw=15 and ta=0 for water and EtOH respectively. The findings pave the way for new applications with aqueous mixtures of critical metals. © 2024, The Authors. All rights reserved.

关键词： Recycling

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Two-photon Lithography of Microrotors in Additive-free Resin: An Approach to Attain Mechanically Robust, Functional Microstructures

Two-photon Lithography of Microrotors in Additive-free Resin...

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Jaiswal, Arun Rani, Sweta Singh, Gaurav Pratap Hassan, Mahbub Nasrin, Aklima Gomes, Vincent G. Saxena, Sumit Shukla, Shobha Water Innovation Center: Technology Research & Education Indian Institute of Technology Bombay MH Mumbai400076 India IITB-Monash Research Academy Indian Institute of Technology Bombay MH Mumbai400076 India Nanostructures Engineering and Modeling Laboratory Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay MH Mumbai400076 India School of Chemical and Biomolecular Engineering The University of Sydney NSW2006 Australia Nano Institute The University of Sydney NSW2006 Australia

ISBN: (纸本)9781957171296

Optimal exposure conditions in two-photon polymerization-based additive manufacturing have been systematically investigated for the fabrication of functional three-dimensional structures in additive-free resin. The realization of complex micro-rotors has been demonstrated using the optimal process parameters. © Optica Publishing Group 2023, © 2023 The Author(s)

关键词： Laser beams Lithography Microstructures Scanning electron microscopy Thin films Ultrafast lasers

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Carbon Quantum Initiator Enabled Fabrication of Dielectric Metamaterials

Carbon Quantum Initiator Enabled Fabrication of Dielectric M...

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

作者： Jaiswal, Arun Rani, Sweta Singh, Gaurav Pratap Archana, T. Hassan, Mahbub Nasrin, Aklima Gomes, Vincent G. Saxena, Sumit Shukla, Shobha Water Innovation Center: Technology Research & Education Indian Institute of Technology Bombay MH Mumbai400076 India IITB-Monash Research Academy Indian Institute of Technology Bombay MH Mumbai400076 India Nanostructures Engineering and Modeling Laboratory Department of Metallurgical Engineering and Materials Science Indian Instituteof Technology Bombay MH Mumbai400076 India School of Chemical and Biomolecular Engineering The University of Sydney NSW2006 Australia Nano Institute The University of Sydney NSW2006 Australia

Two-photon active carbon quantum dots have been exploited as initiators to induce two-photon polymerization for additive manufacturing of dielectric metamaterials. © Optica Publishing Group 2023, © 2023 The ... 详细信息

ISBN: (纸本)9781957171296

关键词： Atomic layer deposition chemical vapor deposition Metamaterials Quantum dots Scanning electron microscopy Thin films

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Occurrence of cadmium in groundwater in China: a review

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Arabian Journal of Geosciences 2022年第17期15卷 1-13页

作者： Hoareau, Carol Emilly Hadibarata, Tony Yılmaz, Murat Environmental Engineering Program Faculty of Engineering and Science Curtin University Malaysia Miri Malaysia Department of Chemical Engineering Faculty of Engineering Osmaniye Korkut Ata University Osmaniye Türkiye

China has one of the world’s fastest-growing economies due to its increase in various industrial activities. A side effect of economic growth is severe environmental problems such as heavy metal contamination of soil and groundwater. Anthropogenic activities are the main sources of cadmium which is highly mobile and toxic with the potential to bioaccumulate in the ecosystem. It can contaminate ground and river water consequently negatively impacting agriculture and water sources. Anthropogenic source of Cd concentrations in China is 0.002 mg/L in drinking water, 0.102 mg/kg in soil, and 0.23–0.96 mg/kg in paddy soil. Geological trends and health implications of cadmium contamination in Human, southern China were analyzed. Source, transportation, and various conventional remediation processes exist today and can be categorized as biological, physical, and chemical. Using nanoparticle technology, it has been found that adsorption capacities can be 3 to 4 times higher compared to using powdered activated carbon. From the experiment carried out, a maximum adsorption capacity of 10.86 mg/g for cadmium was obtained. Cadmium intake in south China populations occurred at an alarming rate and most children were at greater risk of being affected. Therefore, cadmium contamination should be taken seriously by the responsible authorities.

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Two-photon Lithography of Bioinspired Microstructures

Two-photon Lithography of Bioinspired Microstructures

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Frontiers in Optics + Laser science 2023, FiO, LS 203: Part of Frontiers in Optics + Laser science 2023

Two-photon polymerization has been exploited to generate micro replicas of bioinspired structures. As a proof-of-concept a star-fish shaped micro-replica has been demonstrated, with high replication fidelity in acryla... 详细信息

ISBN: (纸本)9781957171296

关键词： Laser beams Laser systems Lithography Microstructures Quantum dots Scanning electron microscopy

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Synthesis and Characterization of Sn, Ge, and Zr Isomorphous Substituted MFI Nanosheets for Glucose Isomerization to Fructose

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CHEMPLUSCHEM 2022年第1期87卷 e202100515页

作者： Dugkhuntod, Pannida Maineawklang, Narasiri Rodaum, Chadatip Pornsetmetakul, Peerapol Saenluang, Kachaporn Salakhum, Saros Wattanakit, Chularat Department of Chemical and Biomolecular Engineering School of Energy Science and Engineering Nanocatalysts and Nanomaterials for Sustainable Energy and Environment Research Network of NANOTEC Vidyasirimedhi Institute of Science and Technology Rayong 21210 Thailand

Various metals including Sn, Ge, and Zr have been successfully incorporated into the MFI nanosheets via a one-pot synthesis. The as-synthesized zeolites exhibit high external surface area and mesopore volume without large metal oxides aggregated on zeolite surfaces. Interestingly, the successful introduction of heteroatoms in MFI nanosheets can be confirmed by shifted XRD peaks corresponding to the unit cell expansion due to the replacement of metals into the framework. In addition, the UV-Vis absorbance spectra reveal that at the suitable metal loading the incorporated tetrahedral coordination of metal species in the zeolite framework has been obtained. To illustrate the benefits of the prepared catalysts, the glucose isomerization to fructose was carried out in a water/dioxane system. Obviously, the SnMFI-NS samples, containing the high dispersion of metal isomorphous species demonstrate the outstanding catalytic behavior in term of fructose selectivity (>85 %).

关键词： glucose isomerization hierarchical zeolites isomorphous substitution MFI zeolites zeolite nanosheets

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Carbon Quantum Initiator Enabled Two-photon Polymerization of Optically Active Functional Microstructures

Carbon Quantum Initiator Enabled Two-photon Polymerization o...

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2023 Conference on Lasers and Electro-Optics, CLEO 2023

作者： Jaiswal, Arun Rani, Sweta Singh, Gaurav Pratap Hassan, Mahbub Nasrin, Aklima Gomes, Vincent G. Saxena, Sumit Shukla, Shobha Nanostructures Engineering and Modeling Laboratory Department of Metallurgical Engineering and Materials Science Indian Institute of Technology Bombay MH Mumbai400076 India IITB-Monash Research Academy Indian Institute of Technology Bombay MH Mumbai400076 India Water Innovation Center: Technology Research & Education Indian Institute of Technology Bombay MH Mumbai400076 India School of Chemical and Biomolecular Engineering The University of Sydney NSW2006 Australia Nano Institute The University of Sydney NSW2006 Australia

Carbon quantum dots have been implemented as two-photon initiators, and rapid prototyping of optically active micro/nanostructures has been demonstrated. © Optica Publishing Group 2023.

ISBN: (纸本)9781957171258

Carbon quantum dots have been implemented as two-photon initiators, and rapid prototyping of optically active micro/nanostructures has been demonstrated. © Optica Publishing Group 2023.

关键词： Semiconductor quantum dots

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