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SSRN 2024年

作者： Liu, Jiale Tao, Haijuan Guo, Weikang Yang, Juan Shuai, Qin Yamauchi, Yusuke Huang, Lijin State Key Laboratory of Biogeology and Environmental Geology Faculty of Materials Science and Chemistry China University of Geosciences No. 388 Lumo Road Hongshan District Wuhan430074 China School of Chemistry and Environmental Engineering Key Laboratory for Green Chemical Process of Ministry of Education Hubei Key Lab of Novel Reactor and Green Chemical Technology Wuhan Institute of Technology LiuFang Campus No.206 Guanggu 1st Road Donghu New & High Technology Development Zone Wuhan Hubei Province Wuhan430205 China Department of Materials Process Engineering Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Aichi Nagoya464-8603 Japan The University of Queensland BrisbaneQLD4072 Australia

Integration of covalent organic framework (COF) nanoparticles with chitosan (CS) to prepare monolithic materials such as aerogels is regarded as an effective strategy to enhance the utility of COFs. However, the facile and green synthesis of COF-CS aerogels is still a challenging task. In this work, an eco-friendly self-repairing technique was developed to fabricate COF-CS aerogels by taking advantage of the dynamic covalent chemistry feature of COFs. This strategy showcases that the solution-processable COF nanoparticles can be integrated with CS through covalent linking between the amino group of CS and the aldehyde group of COF nanoparticles, resulting in mechanically robust hydrogels. Inspiringly, the crystallinity and large specific surface area of pristine COFs can be well-maintained, and the resulting COF-CS aerogel with low density can achieve self-floating in the water column, thereby facilitating practical applications. Moreover, it was possible to produce aerogels with different COF concentrations by changing the reaction parameters. The versatility of the proposed synthetic method was verified by using different imine-linked COFs. This study provides a green and universal method for the preparation of robust COF-CS aerogels with chemical cross-linking structures, holding huge promise for boosting the practical application of COFs. © 2024, The Authors. All rights reserved.

关键词： Chitosan

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Screening of Zeolite Molecular Sieves for Ne/He Separation at Liquid Nitrogen Temperature: Adsorption Behavior, Thermodynamics, and Practical Feasibility

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Separation and Purification Technology 2025年 376卷

作者： Ying Liu Pengfei Xing Yan Zhang Xuecui Wu Muhammad Kashif Qamar Shuang Ni Can Wang Qing-Yuan Yang Shuangjiang Luo CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Mesoscience and Engineering Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences (CAS) Beijing 100190 PR China School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an 710049 Shaanxi PR China

To address the challenge of efficiently separating low concentrations of neon (Ne) from helium (He) in natural gas sources, we examine a series of zeolite frameworks with various structures for their Ne/He adsorption behaviors at liquid nitrogen temperature. Ne and He adsorption characteristics are assessed for the adsorption thermodynamics using isotherm models (Langmuir, Freundlich, Freundlich-Langmuir, and Virial), and dynamic breakthrough experiments to evaluate the feasibility of separating Ne/He gas mixtures under practical conditions. Molecular dynamics simulation calculations are performed to explain the nature of Ne adsorption within the porosities of different zeolite frameworks and identify the prevailing retention mechanisms. Our data identify zeolite SSZ-13 as the optimal material for Ne/He separation at 77 K, achieving the highest Ne adsorption capacity (3.68 mmol g −1 at 101 KPa) and exceptional IAST selectivity of Ne/He among the investigated frameworks under various mixed gas conditions. The exceptional Ne/He separation performance of SSZ-13 is likely attributed to its chabazite (CHA) topology, which provides synergistic confinement effects through its dual-cage architecture, preferentially retaining Ne while allowing He to pass through. Dynamic tests confirm the practical viability of SSZ-13 and ZSM-5, both delivering > 99.999% He purity with stable recyclability over five cycles.

关键词： Adsorption Breakthrough Ne/He separation Zeolite molecular sieves

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Proton Sponge Catalyzes Interfacial Polymerization in Organic Phase to Enhance Nanofiltration Membrane Performance

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SSRN 2023年

作者： Guo, Shiwei Yuan, Bo Wu, Jicheng Wang, Hao Luo, Jianquan Yuan, Chungang Department of Environmental Science & Engineering North China Electric Power University Baoding071000 China Wetland Research Center for Baiyangdian Lake North China Electric Power University Baoding071000 China State Key Laboratory of Biochemical Engineering Institute of Process Engineering University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing100190 China

Highlights➢ The proton sponge (1,8-bis-(dimethylamino)-naphthalene, DMAN) was used for the first time to modulate the interfacial polymerization process and the strategy of mixing the catalyst with the organic phase monomers for instant reaction was proposed, thus realizing the addition of the catalyst to the organic phase side.➢ The nanofiltration membranes prepared by the catalytic strategy showed reduced thickness of the separation layer, reduced roughness, and more uniform pore size distribution, showing nearly double permeate flux (from 8.0 to 15.9 Lm-2h-1bar-1), slightly increased Na2SO4 retention, improved separation selectivity for monovalent/divalent salts, and stronger antifouling ability.➢ The uniformity of membrane pore size distribution was also improved while the membrane structure became looser, which is rarely seen in other reports and promising in the customized preparation of nanofiltration membranes with precise separation ability. © 2023, The Authors. All rights reserved.

关键词： Pore size

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A Continuous process for Cyclic Carbonate Synthesis from Co2 Catalyzed by the Ionic Liquid in Microchannel Reactors: Reaction Kinetics, Mass Transfer, and process Optimization

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SSRN 2022年

作者： Chen, Yu Yu, Jiayuan Yang, Yiqian Huo, Feng Li, Chunshan Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China School of Chemical Engineering University of Chinese Academy of Sciences Beijing100049 China Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China

The reaction of CO 2 and propylene oxide (PO) for the synthesis of propylene carbonate (PC) is an important reaction, but the reaction is generally carried out under high temperature and high-pressure conditions due to the limitation of reaction kinetics and mass transfer, herein we propose a novel microchannel reaction process catalyzed by ionic liquids (ILs). The reaction processes (e.g., catalyst, temperature, pressure, gas-liquid flow rate, catalyst concentration, residence time) were optimized within microchannels of different sizes. The kinetics for carbonate synthesis with CO 2 catalyzed by ionic liquid (IL-[HMIM]Br) in a microchannel reactor was evaluated, and the activation energy of [HMIM]Br was obtained. Based on the rough numerical estimation of mass transfer characteristics, coupled with the reaction characteristics, the microchannel enhancement can reduce the reaction time for this fast reaction to about 1/30 of that in a traditional reactor. This provides new opportunities for enhancing gas-liquid reactions with typical mass transfer control and for CO 2 utilization to achieve carbon-neutral. © 2022, The Authors. All rights reserved.

关键词： Mass transfer

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One-Step Supramolecular Fabrication of Ionic Liquid/Zif-8 Nanocomposites for High-Efficient Capture and Conversion of Co2 from Flue Gas at Discharged Temperatures

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SSRN 2022年

作者： Shi, Lijuan Wu, Haonan Li, Qingchao Zhang, Yuke Qiu, Mingyue Liao, Yuequan Xu, Hongxue Yi, Qun School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430205 China Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of Technology Wuhan430205 China State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of Technology Taiyuan030024 China

High-efficient capture and conversion of CO 2 from flue gas at discharged temperatures (100-120°C) is of vital importance for low energy consumption and emission reduction, which yet remains a great challenge. A one-step supramolecular strategy for incorporating amino-functionalized ionic liquids (AFILs) into ZIF-8 is proposed for capture and conversion of CO 2 from flue gas at discharged temperatures. AFILs are attached through metal-coordination interaction between Zn (II) and the NH 2 group on AFIL, by which the large BET surface area and high thermal stability inherited from ZIF-8 are maintained well. The nanocomposites with low IL consumptions can rapidly capture CO 2 from the flue gas with a high capacity of 2.68 mmol·g -1 within 4 min and efficiently catalyze CO 2 into cyclic carbonates with excellent yield (97.1%) and selectivity (98.1%) at 100 °C and 0.1 MPa. In-situ DRIFTS and DFT calculation elucidated the effective synergistic mechanism of multiple active sites (C 2 -proton on imidazolium ring, imidazolium cation, protons of methyl group, protons of methylene group, Cl anion and Zn (II)) for CO 2 adsorption and conversion. The activities in both the CO 2 capture and conversion can be easily recycled, endowing the nanocomposites with outstanding practical potentials. © 2022, The Authors. All rights reserved.

关键词： Carbon dioxide

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Effect of poly(ethylene glycol) molecular weight on CO_2/N_2 separation performance of poly(amide-12-b-ethylene oxide)/poly(ethylene glycol) blend membranes

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Journal of Energy Chemistry 2019年第1期28卷 39-45页

作者： Shichao Feng Jizhong Ren Dan Zhao Hui Li Kaisheng Hua Xinxue Li Maicun Deng State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

Membranes from block copolymer poly(amide-12-b-ethylene oxide)(Pebax1074) and its blends with different molecular weight poly(ethylene glycol)(PEG)(200, 400, 600, 1500, 4600 and 8000) were prepared. The thermal properties and structures of Pebax1074/PEG blend membranes were characterized by DSC and SEM, and the gas permeation properties of CO_2 and N_2 were also investigated at different temperatures. For Pebax1074/PEG blend membranes with low molecular weight PEG(MW≤ 600), higher gas permeabilities than Pebax1074 were achieved. The permeability increased with the increase of PEG molecular weight. The addition of low molecular weight PEG resulted in decrease in activation energy of permeation. For Pebax1074/PEG blend membranes with high molecular weight PEG(MW≥ 1500), due to the melt of PEO phase crystals, the gas permeation properties of blend membranes were temperaturedependent, which could be divided into crystalline region, transition region and amorphous region according to two different transition temperatures. PEG molecular weight and operation temperature determined different gas permeation properties of Pebax1074/PEG blend membranes in three regions. The activation energies of permeation in crystalline region were larger than those in amorphous region.

关键词： Poly(amide-12-b-ethylene oxide) Polyethylene glycol Blend membrane Carbon dioxide separation

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Detection of Type Ⅰ and Ⅲ collagen in porcine acellular matrix using HPLC-MS

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Regenerative Biomaterials 2020年第6期7卷 577-582页

作者： Yang Zhang Yi Chen Bo Zhao Jianping Gao Leilei Xia Fangyu Xing Yingjun Kong Yongchao Li Guifeng Zhang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringCASBeijing 100190China School of Life Science and Technology Henan Institute of Science and TechnologyXinxiangHenan 453003China Beijing Biosis Healing Biological Technology Co. LtdBeijing 100026China

Acellular matrix(ACM)has been widely used as a *** the main component of ACM,collagen type and content show influence on the material *** this research,the collagen in ACM from different tissues of pig were determined by detection of marker *** marker peptides of Type Ⅰ and Ⅲ collagen were identified from the digested collagen standards using ions trap mass spectrometry(LCQ).The relationship between the abundance of marker peptide and collagen concentration was established using triple quadrupole mass spectrometer(TSQ).The contents of Type Ⅰ and Ⅲ collagen in ACM from different tissues were *** method was further verified by hydroxyproline *** results showed that,the sum of Type Ⅰ and Ⅲ collagen contents in the ACM from small intestinal submucosa,dermis and Achilles tendon of pig were about 87.59,81.41 and 61.13%,respectively,which were close to the total collagen contents in these *** results proved that this method could quantitatively detect the collagen with different types in the ACM of various tissues.

关键词： HPLC-MS marker peptides acellular matrix collagen

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Acanthosphere-Like Ceo2 with Porous Spikes for Efficient Diesel Soot Catalytic Combustion

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SSRN 2023年

作者： Zhao, Yunrong Ma, Aijing Zhao, Gangguo Wang, Jianshen Hu, Shaopu Liu, Dan Kuvarega, Alex T. Mamba, Bhekie B. Gui, Jianzhou State Key Laboratory of Separation Membranes and Membrane Processes Tianjin Key Laboratory of Green Chemical Technology and Process Engineering School of Chemical Engineering and Technology Tiangong University Tianjin300387 China School of Chemistry Tiangong University Tianjin300387 China School of Material Science and Technology Tiangong University Tianjin300387 China Institute for Nanotechnology and Water Sustainability College of Science Engineering and Technology University of South Africa Florida Johannesburg1709 South Africa

Catalytic combustion is regarded as an efficient strategy for eliminating the soot particulates emitted from the diesel engines. Whereas, the insufficient contact between catalyst and soot particulates, as well as the inferior intrinsic activity of catalysts severely restrict the further development and deployment of this technique. In this study, an acanthosphere-like CeO2 catalyst (asl-CeO2) endowed with porous spikes was rationally designed and prepared, which displays outstanding catalytic performance for the soot combustion with the temperature of soot conversion at 10% (T10) and 50% (T50) as low as 324°C and 381°C under the loose contact mode. In addition, the soot combustion performance on the asl-CeO2 was further enhanced when the tight contact mode was deployed or the NO addition introduced. The mechanisem for the superior performance over asl-CeO2 than commercial CeO2 sample (com-CeO2), composed by stacked nanoparticles, were unveiled based on various characterizations, where the acanthosphere-like morphology and porous spikes not only enhanced the contact efficiency between the soot particulates and catalytic sites but also benefited to the mass transfer of gaseous molecules during the reaction. Moreover, the XPS and Raman results revealed that the abundant oxygen vacancies were involved in the asl-CeO2. Furthermore, the H2-TPR and Soot-TPR experiments confirmed the stronger redox capacity of asl-CeO2. Consequently, the combination of these merits endowed the asl-CeO2 a superior catalytic activity toward soot combustion. © 2023, The Authors. All rights reserved.

关键词： Cerium oxide

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Comparative studies on fouling of homogeneous anion exchange membranes by different structured organics in electrodialysis

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Journal of Environmental Sciences 2019年第3期31卷 218-228页

作者： Zhijuan Zhao Shaoyuan Shi Hongbin Cao Yujiao Li Bart Van der Bruggen Division of Environment Technology and Engineering CAS key Laboratory of Green Process and Engineering Beijing Research Center of Process Pollution Control State Key Laboratory of Biochemical Engineering Institute of Process Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Chemical Engineering KU Leuven Zhengzhou Institute of Emerging Industrial Technology Faculty of Engineering and the Built Environment Tshwane University of Technology

Five negatively charged organic compounds with different structures, sodium methane sulfonate(MS), sodium benzene sulfonate(BS), sodium 6-hydroxynaphthalene-2-sulfonate(NSS), sodium dodecyl sulfate(SDS), and sodium dodecyl benzene sulfonate(SDBS), were used to examine the fouling of an anion exchange membrane(AEM) in electrodialysis(ED),to explore the effect of molecular characteristics on the fouling behavior on the AEM and changes in the surface and electrochemical properties of the AEM. Results indicated that the fouling degree of the AEM by the different organics followed the order:SDBS > SDS > NSS > BS > MS. SDBS and SDS formed a dense fouling layer on the surface of the AEM, which was the main factor in the much more severe membrane fouling, and completely restricted the transmembrane ion migration. The other three organics caused fouling of the AEM by adsorption on the surface and/or accumulation in the interlayer of the AEM, and exhibited almost no influence on the transmembrane ion migration. It was also concluded that the organics with benzene rings caused more severe fouling of the AEM due to the stronger affinity interaction and steric effect between the organics and the AEM compared with organics with aliphatic chains.

关键词： Anion exchange membrane Different structural organics Membrane fouling Property characterization Fouling mechanism analyses

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Mechanism and Conformation Changes for the Whole Regeneration process of Cellulose in Pyridinium-Based Ionic Liquids

Research Square

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Research Square 2021年

作者： Li, Chengjie Fang, Timing Zhou, Guohui Ge, Mengmeng Li, Yao Liu, Xiaomin School of Chemistry and Chemical Engineering Qingdao University Shandong Qingdao266071 China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process Engineering Chinese Academy of Sciences Beijing100190 China

In this work, mechanism and conformation changes of cellulose regenerated from ionic liquid by anti-solvents (water, ethanol and acetone) were investigated by molecular simulations. Cellulose model consists of seven glucose single chains were constructed. In order to depict the regeneration mechanism, both the dissolution and regeneration processes of cellulose in [Bpy][OAc] IL were simulated. The methyl hydroxyl group of cellulose will change its conformation during dissolution and regeneration. The conformation of initial cellulose crystal is mainly the tg conformation. After dissolved in ILs, the cellulose conformation changes into the gt conformation and the gg conformation. After regenerated by anti-solvent, the proportion of the gg and gt conformation changes, and the gg conformation increased and the gt conformation decreased. Based on energy analysis, it is concluded that the energy for tg is the lowest, and the tg widely exists in cellulose I. After cellulose is dissolved in ILs, the conformation changes into two higher energy conformations, the gt and gg. In the subsequent regeneration process, with the completion of regeneration, the gg conformation increases and the gt conformation decreases. © 2021, CC BY.

关键词： Cellulose

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