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Development of Novel Ionic Covalent Organic Frameworks Composite Nanofiltration Membranes for Dye/Salt Separation

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SSRN 2023年

Covalent organic frameworks (COF) have desirable properties such as high porosity, low mass density, excellent heat resistance and regulatable structure, making them an ideal candidate for membrane material. The traditional methods for preparing COF composite membranes, such as interfacial polymerization, vacuum filtration, and abrasive coating, have some problems such as poor mechanical properties. Here, we fabricated high performance COF composite membranes by modified casting-precipitation-evaporation method. The designed composite membranes consisted of the ionic COF (iCOF) selective layer and the support layer are applied in dye desalination. The high permeability (~68 L h-1 m-2 bar-1), high dyes rejection (97% for RB), and low salts rejection (~ 2.86% for NaCl) are achieved by the iCOF functional layer. The as-prepared composite membranes have a hydrophilic and highly smooth surface, making them have good anti-fouling performance. In addition, the rigid pore structure of iCOF selective layer endows the composite membranes with excellent stability, the composite membranes maintain original structure under high pressure (6 bar) and ultrasonic treatment (16 kHz for 60 min). This work may open up a novel path to fabricate iCOF composite membranes, which exhibit great potential in dye desalination. © 2023, The Authors. All rights reserved.

关键词： Composite membranes

Synergistic Effects of External Electric Field and Solvent Vapor Annealing with Different Polarities to Enhance β-Phase and Carrier Mobility of the Poly(9,9-dioctylfluorene)Films

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Chemical Research in Chinese Universities 2020年第6期36卷 1310-1319页

作者： MATengning SONG Ningning QIU Jing ZHANG Hao LU Dan State Key Laboratory of Supramolecular Structure and Materials Jilin UniversityChangchun 130012P.R.China National Local Joint Engineering Laboratory for Synthesis Technology of High Performance Polymer College of ChemistryJilin UniversityChangchun 130012P.R.China

In this work,the synergistice efects of external electric field(EEF)and solvent vapor annealing to enhanceβ-phase and carrier mobility of poly(9,9-dioctylfuorene)(PFO)films were *** is found that EEF can promote the PFOβ-phase conformation transition and orientate the PFO chains along the EEF direction with the as-sistance of polar solvent vapor *** chain orderness is closely related to the solvent *** particular,the B-phase content in the annealed film of strong polar chloroform vapor increases from 18.7%to 34.9%after EEF *** a characteristic needle-like crystal is formed in the flm,as a result,the hole mobility is en-hanced by an order of *** mechanism can be attributed to the fast polarization of solvent dipole under the action of EEF,thus forming a driving force that greatly facilitates the orientation of PFO dipole *** also reveals that EEF driving of the PFO chains does not occur with an insoluble solvent vapor since the solvent molecules cannot swell the film,thus there is insufficient free volume for PFO chains to adjust their *** research enriches the understanding of the relationship between solvent vapor annealing and EEF in orientation polymers,and this method is simple and controlled,and capable of integrating into large-area thin film process,which provides new insights to manufacture low-cost and highly ordered polymer films,and is of great significance to enhance carrier mobility and efficiency of photoelectric devices based on polymer condensed matter physics.

关键词： Extermal elecric field Solvent vapor annealing Poly(9,9-dioctylfluorene) β-Phase Carrier mobility

Free-standing flexible graphene-based aerogel film with high energy density as an electrode for supercapacitors

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Nano Materials Science 2021年第1期3卷 68-74页

作者： Shijia Yuan Wei Fan Yanan Jin Dong Wang Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringInnovation Center for Textile Science and TechnologyDonghua University2999 North Renmin RoadShanghai201620PR China Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi214122PR China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of Materials and EngineeringCollaborative Innovation Centre of Nano Functional Materials and ApplicationsHenan UniversityKaifeng475004PR China

Two-dimensional graphene film exhibits sluggish ion diffusivity while three-dimensional(3D)graphene aerogel has low packing density and poor mechanical ***,there is an urgent need for graphenebased film with both mechanical robustness and high specific ***,we present an easy and scalable strategy for fabricating a free-standing flexible graphene-based aerogel film electrode with a two-layered structure,in which the top layer is an interconnected macroporous reduced graphene oxide/carbon nanotube(RGO/CNT)aerogel,and the bottom layer is a flexible electrospun polyacrylonitrile(PAN)nanofiber *** porous 3D structure of the aerogel provides fast transport of electrolyte ions and electrons,while the nanofiber membrane provides both strong support for the aerogel and mechanical ***(PPy)can be uniformly loaded on RGO/CNT/PAN(RCP)composite aerogel film to provide pseudocapacitance,and nitrogen-doped RGO/CNT/carbon nanofiber(NRCC)aerogel film can be obtained by further *** resultant RCP@PPy-0.05//NRCC based asymmetric supercapacitor can have a maximum voltage of 1.7 V and a maximum energy density of 60.6 W h kg^(-1)at 850.2 W kg^(-1).This indicates that free-standing graphene-based aerogel film can be used in flexible supercapacitors.

关键词： Graphene Aerogel film Polypyrrole N-doping Supercapacitor

Thermally Conductive Study of Polyethylene/Al2O3 Composite Networks Cross-linked by Electron Beam Irradiation

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Chemical Research in Chinese Universities 2020年第5期36卷 940-945页

作者： SHI Chengying YANG Jiayu LIU Yang WANG Yanmiao XU Wenge XU Yiquan HU Wei LIU Baijun Key Laboratory of High Performance Plastics Ministry of EducationNational&Local Joint Engineering Laboratory for Synthesis Technology of High Performance PolymerCollege of CheniistiyJilin UniversityChangchun 130012P.R.China Changchun Radiation Technology Co. Ltd.China Isotope&Radiation Corporation(CIRC)Changchun 130102P.R.China Changchun Kinwa High Technology Co. Ltd.Changchun 130102P.R.China Key Laboratory of Polyoxonietalate Science Kfinistiy of EducationFaculty of ChemistryNortheast Normal UniversityChangchun 130024P.R.China

The surface-modifled Al2O3 particles were introduced into polyethylene(PE)to enhance the thermal conductivity,and PE/Al2O3 cross-linked networks with improved thermal and mechanical properties were prepared through electron beam(EB)irradiation *** incorporation of reactive irradiation sensitizer was useful in fabricating a high degree of cross-linking(DC)PE networks under a low irradiation *** the PE sample containing 2%sensitizer,DC ca.67.1%could be obtained under 60 kGy(1 kGy=1000 J/kg).EB-irradiation greatly improved thetensile stress of PE-based samples,and the tensile stresses of the samples with 0.2—5%TMPTA(trimethylolpr pane triacrvlate)under 60 kGy were 24.61—27.77 *** the EB-irradiated samples had higher Vicat softening temperatures than the samples without *** treatment at 120 kGy,the Vicat softening temperatures of PE-Al2O3-44/TMPTA-2 increased from 127℃to 130.4℃.SEM images revealed that PE-Al2O3-5O samples with increased amount of Al2O3 particles showed a conduction"pathway,"and thennal conductivity reached 0.67 W/(m·K).Thus,high-performance pipes were extruded,which could satisfy the static hydraulic blasting test and exhibit improved thennal conduction capability.

关键词： Electron beam(EB)-irradiation Cross-linked network Thermal conductivity

Efficient Co-Removal of Protein and Dyes Via Hybrid Ultrafiltration Membranes Based on Carboxy-Modified Polyaryletherketone

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SSRN 2023年

作者： Wang, Shuai Yin, Li Chen, Pan Dai, Jiangnan Wang, Siyu Zhao, Xiaogang Chen, Chunhai Zhou, Hongwei Key Laboratory of High Performance Plastics Ministry of Education National and Local Joint Engineering Laboratory for Synthetic Technology of High Performance Polymer College of Chemistry Jilin University 2699 Qianjin Street Changchun130012 China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201600 China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic 7098 Liuxian Boulevard Guangdong Shenzhen518055 China

Wastewater purification is a crucial yet challenging and energy-intensive process in the industry production. Ultrafiltration membranes are promising candidates for fulfilling the demands of complex wastewater separations. In this work, the incorporation of amino-functionalized UiO-66 (UiO-66-NH2) into the PEK-COOH matrix was achieved through a non-solvent-induced phase separation technology to prepare a series of mixed matrix ultrafiltration membranes with excellent anti-fouling, rejection rate and water flux. For the mixed matrix ultrafiltration membrane, the UiO-66-NH2 could effectively adjust surface charge, hydrophilicity, and pore structures in membrane materials. The mixed matrix ultrafiltration membranes with 2 % of UiO-66-NH2 loading (M-2%) showed the highest water flux of 454.5 L h-1m-2 due to the synergistic regulation of pore structures and surface hydrophilicity. At the same time, M-2% also showed an impressive organic dyes separation performance owning to adjustable surface charge. Therefore, the incorporation of appropriate MOFs into the ultrafiltration membrane can effectively regulate the pore structures, surface hydrophilicity and surface charge, enhancing the performance of mixed matrix ultrafiltration membranes for wastewater purification. © 2023, The Authors. All rights reserved.

关键词： Pore structure

Quaternary Ammonium Salts Modification Preparing Charged Janus Nanofiltration Membrane for the Simultaneous Separation of Divalent Anions and Cations

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SSRN 2022年

作者： Mi, Zhiming Liu, Zhixiao Meng, Lingjun Huang, Yangyang Zhang, Dexing Wang, Junman Zhang, Kaiyang Xiao, Jingling Sun, Yue Liu, Jialing Xu, Luowen He, Hongru Wang, Shuai Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of Chemistry Biology and Materials Science East China University of Technology Nanchang330013 China Key Laboratory of High Performance Plastics Ministry of Education National and Local Joint Engineering Laboratory for Synthetic Technology of High Performance Polymer College of Chemistry Jilin University Qianjin Street 2699 China

Simultaneous separation of divalent co-ions and counter-ions from mixed ions water environment was urgently needed to improve separation efficiency and reduce energy consumption. The charged Janus nanofiltration membranes (NFMs) came into being based on the Donnan effect, however, its practical application was still limited by complex preparation, low permeability or poor ion selectivity. Here, with carboxylated polysulfone (PSF-COOH) ultrafiltration membrane as the support layer, a newly discovered quaternary ammonium salt containing diamine group (ethidium bromide, EB) was used to modify pristine polyamide nanofilm to prepare a novel charged Janus NFM. Structural characterization and molecular dynamics simulation indicated that the difference in electrostatic force of PSF-COOH with piperazine (PIP) and EB resulted in a huge difference in their diffusion rates and hence achieved their regular distributions in the oil-water interface. As a result, EB modification induced the structure heterogeneity (charge and morphology) of the polyamide layer, which simultaneously ensured the excellent monovalent/divalent anion and cation selectivity and high permeability. Moreover, other analogues of EB were applied and proved the generality of the mechanism for preparing charged Janus NFMs in this study, which represented a method for the scalable preparation of ultra-selective membranes with heterostructure for simultaneous separation of divalent co-ions and counter-ions. © 2022, The Authors. All rights reserved.

关键词： Energy utilization

Oligo (Ethylene Glycol) Side Chain engineering: An Efficient Way for Boosting the Development of Green-Solvent Processable Electrochromic Devices

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SSRN 2023年

作者： Li, Shiyi Wang, Qilin Zhai, Yuehui Xing, Zhen Zhong, Jundong Chao, Danming Zhu, Xuanbo Rong, Changru Wu, Zongquan Chen, Zheng National and Local Joint Engineering Laboratory for Synthetic Technology of High-Performance Polymer College of Chemistry Jilin University Changchun130012 China State Key Laboratory of Supramolecular Structure and Materials College of Chemistry Jilin University Changchun130012 China National Key Laboratory of Advanced Vehicle Integration and Control China FAW Group Co. Ltd. Changchun130013 China

As an effective strategy for improving the performance of optoelectronic polymers, oligo (ethylene glycol) (OEG) side chain engineering has been widely used in optoelectronic materials field. However, the research on its impact on electrochromic (EC) polymers started to be explored in recent years. In this work, the excellent EC properties of the star polymer PTQ-10 were first investigated and proved. Subsequently, a series of novel PTQ-type polymers with OEG side chains (PTQ-OEGs) were successfully synthesized and studied. Compared with PTQ-10, the introduction of OEG side chains can significantly shorten the coloring time (~82.2%) and improve the coloration efficiency (~17.0%). Notably, the solubility of PTQ-OEGs is greatly enhanced in ideal green solvents (alcohol) via introducing the OEG side chains. Therefore, the EC active layers of PTQ-BTEG can be simply fabricated by its ethanol solution. Based on this feature, an all-green EC device PTQ-BTEG@ECD-2 (from material processing to device preparation) was prepared successfully, which exhibited fast coloring (3.41 s) and bleaching (13.17 s) as well as high coloration efficiency (396.12 cm2 C-1). Hence, we not only reported the relationship between OEGs and EC polymers thoroughly, but also proved the OEG engineering is a practical approach to promote the development of all-green EC devices in the near future. © 2023, The Authors. All rights reserved.

关键词： Conjugated polymers

A unified prediction solution for vibro-acoustic analysis of composite laminated elliptical shells immersed in air

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Journal of Central South University 2021年第2期28卷 429-444页

作者： GUAN Xian-lei ZHONG Rui QIN Bin WANG Qing-shan SHUAI Ci-jun State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China Joint International Research Laboratory of Key Technology for Rail Traffic Safety Central South UniversityChangsha 410075China National&Local Joint Engineering Research Center of Safety Technology for Rail Vehicle Central South UniversityChangsha 410075China Institute of Bioadditive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China

A semi-analytical method to conduct vibro-acoustic analysis of a composite laminated elliptical shell immersed in air is proposed.A variational method and multi-segment technique are used to formulate the dynamic *** sound radiation of the exterior fluid field is calculated by a spectral Kirchhoff–Helmholtz integral *** variables containing displacements and sound pressure are expanded by the combination of Fourier series and Chebyshev orthogonal *** collocation points are introduced to construct an algebraic system of acoustic integral equations,where these points are distributed on the roots of Chebyshev polynomials,and the non-uniqueness solution of system is eliminated by a combined Helmholtz *** examples for sound radiation problems of composite laminated elliptical shells are presented and individual contributions of the circumferential modes to the acoustical results of composite laminated elliptical shells are also *** effects of geometric and material parameters on sound radiation of composite laminated elliptical shells are also investigated.

关键词： composite laminated elliptical shells semi-analytical method vibration sound radiation

Novel Zwitterionic (In-Situ Modified Pes-N/Pes-Cooh) Mixed Matrixed Ultrafiltration Membranes with high Permeability and Anti-Fouling Property

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SSRN 2023年

作者： Wang, Shuai Yin, Li Dai, Jiangnan Chen, Pan Liu, Zhixiao Zhao, Xiaogang Chen, Chunhai Zhou, Hongwei Key Laboratory of High Performance Plastics Ministry of Education National and Local Joint Engineering Laboratory for Synthetic Technology of High Performance Polymer College of Chemistry Jilin University 2699 Qianjin Street Changchun130012 China Center for Advanced Low-Dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201600 China Hoffmann Institute of Advanced Materials Shenzhen Polytechnic 7098 Liuxian Boulevard Guangdong Shenzhen518055 China Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices School of Chemistry Biology and Materials Science East China University of Technology Nanchang330013 China

Ultrafiltration membrane is one of the most commonly used separation materials for wastewater treatment, due to its low operating pressure, high flux and large specific surface area. In this work, we utilized PES polymer as a polymer precursor to prepare a series of zwitterionic ultrafiltration membranes with different content of zwitterionic group via simple polymer blending processes. The zwitterionic groups in zwitterionic ultrafiltration membranes could effectively regulate the retention ability and significantly improve the water flux of membrane. The zwitterionic ultrafiltration membranes with the content ratio of 4:6 (PES-N/PES-COOH) exhibited the highest water flux of 467 Lm-2 h-1 and BSA retention factor of 94.2% than that of other ultrafiltration membranes owning to the abundant porosity and suitable thickness of the top layer. Moreover, the results of static BSA adsorption and flux recovery ratio also proved that the zwitterionic ultrafiltration membranes have a good BSA rejection and antifouling performance. Therefore, these results reveal a simple synthesis and design strategy for constructing the high-performance zwitterionic ultrafiltration membranes for water treatment and provide theoretical and technical guidance for water treatment process based on membrane technology. © 2023, The Authors. All rights reserved.

关键词： Wastewater treatment