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Facile Construction of Flexible Mxene-Based Janus Film with Superior Heat Dissipation Capability for Ultra-Efficient Electromagnetic Interference Shielding And Joule Heating

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SSRN 2023年

作者： Zhou, Meng Hu, Yuzhu Yan, Zhiguo Fu, Heqing School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product Technology South China University of Technology Guangzhou510640 China Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430074 China

The incorporation of polymers into MXene-based functional materials has been proven to be an effective strategy for improving their flexibility and mechanical properties. However, insulating polymers inevitably sacrifice the conductivity of MXene, resulting in a deterioration of electromagnetic interference (EMI) shielding performance. In this work, inspired by Janus structure, an asymmetric flexible film composed of the carboxylated styrene-butadiene rubber (XSBR) with magnetic boron nitride nanosheets (mBNNS) layer and the MXene layer is developed through a facile casting plus spraying approach. The resulting mBNNS/XSBR@MXene (BXM) Janus film demonstrates the characteristic of "one side insulation, one side conductivity", with the conductivity of 2746 S·cm-1 on the MXene side and surface resistivity of 4.9×1013 Ω on the mBNNS/XSBR side. Profit from the designed Janus architecture, the EMI shielding effectiveness and in-plane thermal conductivity of the BXM Janus film reach 74.55 dB and 8.45 W∙m-1∙K-1 when the total mass fraction of mBNNS and MXene is 50 wt%, which is 148% and 43.46% higher than that of the BXM blend film without Janus structure. Moreover, the BXM Janus film exhibits low applied voltage (~3.0 V) driven Joule heating performance with a response time of less than 10 s, a saturation temperature of 133.7 ℃, and long-term steady reliability. Meanwhile, the BXM Janus film possesses good mechanical properties and excellent EMI shielding stability. Therefore, this work provides a facile yet effective strategy to fabricate flexible MXene-based multifunctional film for EMI shielding, heat dissipation, and thermal management applications. © 2023, The Authors. All rights reserved.

关键词： Thermal conductivity

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Sodium Alginate Aerogel Beads Incorporated with Magnetic Coconut Shell Biochar for Efficient Removal of Methylene Blue from Wastewater

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SSRN 2024年

作者： Zhou, Meng Yang, Dongxiao Yan, Zhiguo Fu, Heqing School of Chemistry and Chemical Engineering Guangdong Provincial Key Lab of Green Chemical Product Technology South China University of Technology Guangzhou510640 China Key Laboratory for Green Chemical Process Ministry of Education School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430074 China

The difficulty in recovering powdered biochar and the limited adsorption capacity have become two main factors restricting the application of agricultural waste in dye adsorption. To address these challenges, this work fabricates Fe3O4-modified coconut shells biochar (mCSB)/sodium alginate (SA) aerogel beads by in-situ crosslinking-gelation method and freeze-drying technology for the removal of methylene blue (MB) from wastewater. The spherical mCSB/SA aerogel beads with good magnetic properties (12.8 emu·g-1) are easy to separate from aqueous solutions, completely avoiding the risk of equipment blockage and secondary pollution caused by powdered adsorbents. Moreover, the maximum adsorption capacity of mCSB/SA aerogel beads calculated by the Langmuir isotherm model is 625 mg·g-1 for MB, which is much higher than the reported values for most biochar adsorbents. Meanwhile, the adsorption process of MB on mCSB/SA aerogel beads not only is found as spontaneous and endothermic but also follows the pseudo-second-order kinetic. Encouragingly, the adsorption efficiency of mCSB/SA aerogel beads remains above 95% even after 5 times of reusability cycles, demonstrating excellent regeneration ability. This work proposes a simple and scalable fabrication strategy to convert agricultural waste into efficient adsorbents for wastewater treatment, following the principles of sustainable development. © 2024, The Authors. All rights reserved.

关键词： Sodium alginate

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Fouling Behavior of Nanofiltration Membrane During the Refining Treatment of Morphlines-Dominant Reverse Osmosis Concentrate

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SSRN 2024年

作者： Li, Yahui Dong, Yanan Chen, Shangqing Wu, Yingqiu Wang, Junfeng Nie, Yi 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 Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100049 China Petrochemical Research Institute PetroChina Beijing102206 China School of Chemical Engineering and Pharmacy Hubei Key Lab of Novel Reactor & Green Chemical Technology Key Laboratory of Green Chemical Engineering Process Ministry of Education Wuhan Institute of Technology Wuhan430205 China

Nanofiltration (NF) has shown significant promise for separating morpholines with a molecular weight below 200 Da in refining reverse osmosis concentrate (ROC). However, its application is severely hampered by membrane fouling resulting from complex interactions between the membrane and organic/inorganic substances present in ROC. Our prior research identified the DK membrane as highly efficient in separating morpholine from high-saline NaCl-rich aqueous solutions during ROC treatment. Nevertheless, permeability notably decreased over prolonged operation. To ensure the long-term stability of nanofiltration operations, this study delves into the fouling behavior of individual substances present in hydrosaline organic solutions on nanofiltration membranes, aiming to elucidate the fouling mechanism. Consequently, we systematically investigated the effects of salts (NaCl and Na2SO4), organic substances (including N-(2-hydroxypropyl) morpholine (NMH) and 4-morpholineacetate (MHA)), and representative divalent ions (Ca2+ and Mg2+) on the performance and physicochemical properties of the DK membrane. Our findings revealed that both salts and organics induced swelling of the DK membrane, resulting in an enlargement of the mean effective pore size, thereby allowing more organic molecules to permeate the membrane pores. Notably, MHA caused irreversible pore blocking. Additionally, increasing Ca2+ concentrations led to gypsum scaling on the membrane surface, with NMH potentially acting as nuclei, expediting gypsum crystal formation during CaSO4 crystallization. In conclusion, this study systematically elucidated the fouling behavior of substances present in high-saline organic wastewater on DK membranes, proposing corresponding fouling mechanisms. These insights offer valuable guidance for membrane fouling control and cleaning in treating high salinity and organic wastewater. © 2024, The Authors. All rights reserved.

关键词： Nanofiltration

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MOF-derived carbon nanotube/vertical graphene composite: A binder-free electrode for high-performance supercapacitors with aqueous redox electrolyte

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Carbon 2025年 241卷

作者： He, Mingliang Qiao, Jia Zhou, Binghua Guo, Shien Zhu, Guozhen Wang, Jie Melvin, Gan Jet Hong Wang, Mingxi Ogata, Hironori Kim, Yoong Ahm Terrones, Mauricio Endo, Morinobu Zhang, Fei Wang, Zhipeng School of Chemical Engineering National Engineering Research Center for Carbohydrate Synthesis Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal University 99 Ziyang Avenue Nanchang330022 China Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol Fiber Material College of Chemistry and Materials Engineering Huaihua University Huaihua418000 China Centre of Research in Energy and Advanced Materials Faculty of Engineering Universiti Malaysia Sabah Jalan UMS Sabah Kota Kinabalu88400 Malaysia Key Laboratory for Green Chemical Process of Ministry of Education School of Chemical and Environmental Engineering Wuhan Institute of Technology Guanggu 1st Road Wuhan430205 China Department of Chemical Science and Technology Faculty of Bioscience and Applied Chemical and Graduate School of Engineering Hosei University 3-7-2 Kajino-cho Tokyo Koganei184-8584 Japan School of Polymer Science and Engineering Chonnam National University 77 Yongbong-ro Bukgu Gwangju500-757 Korea Republic of Research Initiative for Supra-Materials Faculty of Engineering Shinshu University 4-17-1 Wakasato Nagano380-8553 Japan Department of Physics Department of Materials Science and Engineering & Materials Research Institute The Pennsylvania State University University Park PA16802 United States

Vertical graphene (VG), with its unique 3D structure and exceptional properties, is considered an excellent electrode material for supercapacitors. However, the strong hydrophobicity of VG significantly limits its performance in aqueous supercapacitors. In this study, we successfully construct a hybrid carbon nanotubes-vertical graphene-carbon cloth (CNT-VG-CC) structure by converting metal-organic frameworks (MOFs) into carbon nanotubes (CNTs) on the VG surface. This hybrid structure is then employed to fabricate a novel binder-free electrode for hybrid supercapacitors, which operate in a KOH electrolyte with redox additives, K3Fe(CN)6/K4Fe(CN)6. The resulting CNT-VG-CC hybrid structure not only exhibits superhydrophilicity but also offers a large effective specific surface area, enhancing electrolyte contact. The CNT-VG-CC electrode demonstrates an ultrahigh areal capacitance of 1526.5 mF/cm2 at 10 mA/cm2, nearly 100 % coulombic efficiency, and exceptional cycling stability, retaining 100 % of its capacitance after 10,000 charge-discharge cycles. The assembled supercapacitor device delivers a high energy density of 179.7 μW h/cm2 at a power density of 8000.0 μW/cm2. Remarkably, after 10000 cycles, it retains 118.9 % of its initial areal capacitance and maintains a coulombic efficiency of 90.7 %. These impressive performances can be attributed to the unique CNT-VG-CC hybrid structure, its super-hydrophilic property, high electronic conductivity, lager effective specific surface area, and synergistic interaction between the redox electrolyte and the CNT-VG-CC electrode. © 2025 Elsevier Ltd

关键词： Potassium hydroxide

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Regulation of Hydrogen Acceptance Capacity of Mgo to Enhance Ammonia Synthesis Rate of Cs-Ru/Mgo by Hydrogen Spillover

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SSRN 2022年

作者： Huang, Jia Jiang, Xingmao You, Zhixiong Key Laboratory for Green Chemical Process Ministry of Education Hubei Key Lab of Novel Reaction & Green Chemical Technology School of Chemical Engineering and Pharmacy Wuhan Institute of Technology Wuhan430205 China School of Resources and Environmental Sciences Wuhan University Wuhan430079 China

Efficient ammonia synthesis is a significant but challenging target. One of questions to be faced in the Ru-based ammonia synthesis catalyst is the ill hydrogen poison effect of Ru. In this work, we developed a strategy to greatly alleviate the effect by regulating hydrogen acceptance capacity of support MgO, thereby promoting the ammonia synthesis rate. To this end, three kinds of MgO (MgO-c, MgO-p and MgO-s) with the varying content of surface active oxygen were chosen as the carrier of Ru catalysts for the synthesis of ammonia. The H2-TPR, in situ FTIR and EPR characterizations show that MgO-c supports have more active oxygen which can accept hydrogen atoms from the Ru surface as compared to the other two kinds of MgO. The kinetic analysis results show that the value of the hydrogen reaction order is 4Cs-Ru/MgO-c > 2Cs-Ru/MgO-p > Cs-Ru/MgO-s >0, indicating that no hydrogen poisoning occurs. Moreover, a positive and linear relationship was found between the ammonia synthesis rates over three Cs-Ru/MgO catalysts and their hydrogen reaction orders, confirming the crucial role of the alleviated hydrogen poison effect in the enhanced ammonia synthesis rate. Therefore, MgO containing abundant active oxygen can be expected to be a promising commercial catalyst carrier for Ru-based ammonia synthesis. © 2022, The Authors. All rights reserved.

关键词： Magnesia

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Post-Combustion CO 2 Capture Demonstration Using Supported Amine Sorbents: Design and Evaluation of 200 kW th Pilot

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Energy Procedia 2014年 63卷 2374-2383页

作者： Wenying Zhao Rens Veneman Denggao Chen Zhenshan Li Ningsheng Cai Derk W.F. Brilmana Key Lab for Thermal Science and Power Engineering of MOE Department of Thermal Engineering Tsinghua University Beijing 100084 China Sustainable Process Technology Group Green Energy Initiative Faculty of Science and Technology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands

CO 2 capture using supported amine sorbents is a promising post-combustion capture technology. With regard to supported amine sorbents, the most important issues exist in the regeneration process. In this paper, various regeneration strategies including thermal regeneration in pure CO 2 stream, vacuum regeneration, and steam-stripping regeneration are put forward and compared from the aspect of energy consumption. Besides, to ensure the long-term thermal and chemical stability and high working capacity, a kind of supported amine sorbent with the amine groups bonded to the support was tested and employed. As to the regeneration characteristics, the sorbent can be regenerated completely in pure CO 2 and has perfect cyclic stability. Finally, one 200 kW th pilot plant was designed and constructed to demonstrate the process feasibility of continuous CO 2 capture from flue gases with supported amine sorbents. The selection of the type of absorber and regenerator is discussed in detail. The pilot was evaluated for the air tightness and heat transfer issues.

关键词： CO 2 capture pilot countercurrent downer supported amine

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Adsorption of CO 2 and H 2 O on supported amine sorbents

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Energy Procedia 2014年 63卷 2336-2345页

作者： Rens Veneman Wenying Zhao Zhenshan Li Ningsheng Cai Derk W.F. Brilman Sustainable Process Technology Group Green Energy Initiative Faculty of Science and Technology University of Twente P.O. Box 217 7500 AE Enschede The Netherlands Key Lab for Thermal Science and Power Engineering of MOE Department of Thermal Engineering Tsinghua University Beijing 100084 Peoples Republic of China

In this work we have evaluated the H 2 O and CO 2 adsorption characteristics of Lewatit VP OC 1065 in view of the potential application of solid sorbents in post combustion CO 2 capture. Here we present single component adsorption isotherms for H 2 O and CO 2 as well as co-adsorption experiments. It was concluded that the sorbent material shows a high affinity in the adsorption of H 2 O. The adsorption of CO 2 alone does not prevent the co- adsorption of large quantities of water and additional measures are necessary to prevent this from negatively affecting the energy demand of the process.

关键词： Adsorption CO 2 H 2 O Carbon Capture supported amines

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Highly Active and Stable Cuxfey/Ac-H Catalysts with Cufe2o4 for No Reduction by Co in the Presence of H2o and So2 Under Regeneration Gas

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SSRN 2022年

作者： Xu, Zhicheng Li, Yuran Lin, Yuting Wang, Bin Wang, Qiang Zhu, Tingyu CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing100083 China

For industrial flue gas, the synergistic removal of NOx and CO pollutants is in high demand but still has not been realized due to the presence of O2. We propose firstly that activated carbon regeneration gas provides suitable O2 -free conditions for NO reduction by CO, but high contents of 5% SO2 and 5% H2O affect the catalyst activity. Here, we report a bimetallic modified catalyst CuxFey/AC-H that exhibits high catalytic activity under the abovementioned conditions due to the high amount of CuFe2O4. By regulating the Cu/Fe ratio, the formation of CuFe2O4 active sites is promoted, which improves the redox properties, adsorption and activation capacity of NO, high valence metal ratio, and content of synergistic oxygen vacancies. Based on in situ DRIFTS and fixed-bed FTIR/MS combined platform, it was found that the side reaction of H2O with the intermediate of −NCO forms NH3 above 250 °C and with CO forms H 2 above 400 °C. NH3 and H2 provide additional reaction pathways of Fast-SCR and H2-SCR to significantly improve the reaction activity with 92.0% of NO conversion at 450 °C and 108,000 mL g -1 h -1 on Cu2Fe2/AC-H. According to DFT calculations, CuFe2O4 active sites provide the high binding energy of sulfation, and then Cu2Fe2/AC-H demonstrates excellent activity and long-term stability with 72.2% of NO conversion at high contents of SO2 and H2O for 48 h. And CuxFey/AC-H provides great potential prospects for the application of NO reduction by CO under activated carbon regeneration gas. © 2022, The Authors. All rights reserved.

关键词： Copper compounds

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A Novel Pmdeta-Amp/Deta-Sulfolane Biphasic Absorbent for Industrial Co2 Capture: Analysis of the Balance between Performance and Viscosity

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SSRN 2023年

作者： Xu, Wenqing Fu, Le Yang, Yang Geng, Zanbu Wang, Yixi Hao, Runlong Zhu, Tingyu CAS Key Laboratory of Green Process and Engineering Institute of Process Engineering Innovation Academy for Green Manufacture Chinese Academy of Sciences Beijing100190 China Department of Environmental Science and Engineering North China Electric Power University Baoding071003 China Center for Excellence in Regional Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen361021 China University of Chinese Academy of Sciences Beijing100049 China Hebei Key Lab of Power Plant Flue Gas Multi-Pollutants Control China

The biphasic solvent is a promising solution to reduce regeneration energy consumption in CO2 capture. However, most current biphasic solvents suffer from high viscosity and poor desorption of the rich phase. To address these issues, a novel pentamethyldiethylenetriamine (PMDETA)-2-amino-2-methyl-1-propanol (AMP)/diethylenetriamine (DETA)-sulfolane biphasic solvent was developed. Sulfolane was used as a phase separator to promote phase separation, and AMP was used as an additive to reduce the viscosity of the rich phase while promoting regeneration efficiency. For the P2.4A0.8D0.8S2 biphasic solvent, the CO2 loading of the rich phase was 5.87mol/L, and the proportion of the rich phase volume ratio was 35%, which surpasses most reported biphasic solvents. The viscosity was significantly reduced from 527.00 mPa·s to 92.26 mPa·s. Concurrently, the highest desorption rate was achieved at this condition, with a cyclic capacity of 5.36 mol/L and a CO2 recovery ratio of 91%. Thermodynamic analysis showed that the biphasic solvent produced a lower regeneration energy consumption of 1.70GJ/tCO2, which was 57% lower than that of monoethanolamine (MEA). The CO2 absorption products were carbamate and HCO3-/CO32-, all of which were enriched in the rich phase. The lean phases were primarily PMDETA and sulfolane, which achieved good phase separation. After desorption of the rich phase, the HCO3-/CO32- in the absorption product was completely desorbed with high desorption performance. Overall, the PMDETA-AMP/DETA-sulfolane biphasic solvent exhibited an excellent balance between performance and viscosity, which provided new insights for the designing of biphasic solvent. © 2023, The Authors. All rights reserved.

关键词： Carbon dioxide

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Synthesis and properties of novel polyimides based on 2',7'-bis(4-aminophenoxy)-spiro(4,5-diazafluorene-9,9'-xanthene)

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Journal of Macromolecular Science, Part A 2021年第11期58卷 811-819页

作者： Hui Li Baomin Fan Dewen Sun a School of Chemical Engineering and Pharmacy Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of Technology Wuhan PR China b Beijing Key Laboratory of Quality Evaluation Technology for Hygiene and Safety of Plastics Beijing Technology and Business University Beijing PR China c State Key Lab High Performance Civil Engn Mat Nanjing PR China

A new class of polyimides had been synthesized from a novel aromatic diamine, 2',7'-bis(4-aminophenoxy)-spiro(4,5-diazafluoren-9,9'-xanthene). Polyimides were prepared by two-stage polycondensation of diamine monomer with various aromatic dianhydride. These polymers showed good thermal stability, solubility and optical transparency. These polymers showed good thermal stability, solubility and optical transparency. Except 6a, all polyimides were dissolved in aprotic polar solvents at room temperature. The glass transition temperatures (Tg) of the poly(ether imide)s were determined to be 338–423 °C and 345–428 °C by dynamic mechanical thermal analyses (DMA) and differential scanning calorimeter (DSC), respectively. Decomposition temperature for 10% weight loss all of these poly(ether imide)s above 560 °C in both nitrogen and air atmospheres. Normalized transparencies in the visible region (400–780 nm) were recorded between 67% and 83%. The dielectric constants of polyimide film were recorded in the range of 2.56–3.12 at 1 *** Abstract

关键词： 2' 7'-bis(4-aminophenoxy)-spiro(4 5-diazafluoren-9 9'-xanthene) 4 5-diazafluorene thermal stability organic soluble polyimide

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