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In this review, the H2S/CH4 separation properties of polymer membranes are presented and a new upper bound is proposed. In view of the existing problems and development prospects of various membranes, the corresponding opinions and advices are given.
Yulei Ma; Hongfang Guo; Roman Selyanchyn; Bangda Wang; Liyuan Deng; Zhongde Dai; Xia Jiang. Hydrogen sulfide removal from natural gas using membrane technology: a review. Journal of Materials Chemistry A 2021, 1 .
AMA StyleYulei Ma, Hongfang Guo, Roman Selyanchyn, Bangda Wang, Liyuan Deng, Zhongde Dai, Xia Jiang. Hydrogen sulfide removal from natural gas using membrane technology: a review. Journal of Materials Chemistry A. 2021; ():1.
Chicago/Turabian StyleYulei Ma; Hongfang Guo; Roman Selyanchyn; Bangda Wang; Liyuan Deng; Zhongde Dai; Xia Jiang. 2021. "Hydrogen sulfide removal from natural gas using membrane technology: a review." Journal of Materials Chemistry A , no. : 1.
In this study, high-purity mordenite (MOR) zeolite was successfully synthesized from coal fly ash (CFA) using a simple and green method without organotemplate. The Al and Si used for MOR synthesis were simultaneously extracted from CFA, which were transformed to aluminosilicate gel by co-precipitation and then coupled with MOR seed for MOR synthesis instead of using organotemplate in common method. The results showed that the Al and Si extraction efficiencies were high, reaching up to 82.18% and 93.15%, respectively. The synthesized CFA-based MOR zeolite had a low Si/Al ratio of 3.92, and micropores is the dominating pore structure in the synthesized zeolite, accounts for up to 63.16% of its total pore volume. The possible mechanisms of MOR zeolite from CFA by gel coupling seed assisted synthesis were discussed. Furthermore, the CFA-based MOR was applied in CO2 adsorption, heavy metal ions adsorption in aqueous solution and catalyst carrier for NH3-SCR reaction. The results presented that the CO2 adsorption capacity of the CFA-based MOR was 1.92 mmol/g with high cycle stability. The removal rate of Pb2+ was above 99.99% with Pb2+ initial concentration of 51.30 mg/L. Mn-MOR catalyst was obtained through loading 3.36 wt% Mn by ion-exchange, which had a NO conversion rate of 93.58% at 200 °C. This study demonstrates that the gel coupling seed assisted method without organotemplate is a potential way to synthesize zeolite materials using the Si and Al simultaneously extracted from CFA.
Tongxiao Zhou; Bangda Wang; Zhongde Dai; Xia Jiang; Yi Wang. Organotemplate-free synthesis of MOR zeolite from coal fly ash through simultaneously effective extraction of Si and Al. Microporous and Mesoporous Materials 2021, 314, 110872 .
AMA StyleTongxiao Zhou, Bangda Wang, Zhongde Dai, Xia Jiang, Yi Wang. Organotemplate-free synthesis of MOR zeolite from coal fly ash through simultaneously effective extraction of Si and Al. Microporous and Mesoporous Materials. 2021; 314 ():110872.
Chicago/Turabian StyleTongxiao Zhou; Bangda Wang; Zhongde Dai; Xia Jiang; Yi Wang. 2021. "Organotemplate-free synthesis of MOR zeolite from coal fly ash through simultaneously effective extraction of Si and Al." Microporous and Mesoporous Materials 314, no. : 110872.
Microporous carbon has been widely known as a probable material to capture greenhouse gases. This work provides a facile synthesis of monodisperse biomass-derived microporous carbon spheres (CSs) for effective CO2 capture. The spheres were synthesized by a novel continuous microfluidic strategy from oil-in-water-in-oil ((O1/W2)/O2) emulsions. O1 nanodroplets could be self-assembled into the cores of micelles, which were formed by chitosan and surfactant F127 in the W2 phase through high-speed liquid-phase shearing. The obtained O1/W2 emulsion can be further sheared into a sphere by the O2 phase. After carbonization, nanodroplet-templated pores shrank to micropores and ultramicropores. The optimal sample showed the developed pore structure with a Brunauer–Emmett–Teller (BET) surface area of 576 m2/g and microporous volume of 0.22 cm3/g. Compared with O1 free CS, the dynamic adsorption capacity of CO2 was improved to 1.20 mmol/g from 0.42 mmol/g. The CO2 capture capacity, cycling stability, isosteric heats, and mass diffusion coefficient of CSs were evaluated as well. The results demonstrate that microporous CSs are promising candidates for CO2 capture with low cost and a green synthesis route, which was achieved via continuous microfluidic strategy using sustainable biomass chitosan as a carbon precursor and droplets as templates.
Ziheng Jin; Xia Jiang; Zhongde Dai; Lingling Xie; Wei Wang; Liang Shen. Continuous Synthesis of Nanodroplet-Templated, N-Doped Microporous Carbon Spheres in Microfluidic System for CO2 Capture. ACS Applied Materials & Interfaces 2020, 12, 52571 -52580.
AMA StyleZiheng Jin, Xia Jiang, Zhongde Dai, Lingling Xie, Wei Wang, Liang Shen. Continuous Synthesis of Nanodroplet-Templated, N-Doped Microporous Carbon Spheres in Microfluidic System for CO2 Capture. ACS Applied Materials & Interfaces. 2020; 12 (47):52571-52580.
Chicago/Turabian StyleZiheng Jin; Xia Jiang; Zhongde Dai; Lingling Xie; Wei Wang; Liang Shen. 2020. "Continuous Synthesis of Nanodroplet-Templated, N-Doped Microporous Carbon Spheres in Microfluidic System for CO2 Capture." ACS Applied Materials & Interfaces 12, no. 47: 52571-52580.
In this study, hierarchical porous biochar was prepared from poplar sawdust by air oxidation coupling with NH3 treatment for the removal of toluene. The results showed that the mesopore volume of the sample with air oxidation (PS-O2) increased significantly to 0.263 cm3/g from the blank sample (PS, 0.053 cm3/g). This could be attributed to the selective removal of the lignin carbon by air oxidation to develop mesopores in biochar. Following further NH3 treatment (PS-O2-NH3), the basic surface chemistry on biochar was improved due to increased basic N-containing groups and decreased acidic O-containing groups, together with the micropore volume also increased to 0.231 cm3/g from 0.186 cm3/g of PS-O2. The formation mechanism of hierarchical porous structure of biochar was also discussed. The adsorption capacity of PS-O2-NH3 for toluene reached 218.4 mg/g at the initial concentration of 820 mg/m3, which was 383.2% higher than that of PS. The adsorption isotherm study indicated that the adsorption process of toluene was monolayered and the maximal adsorption capacity of PS-O2-NH3 for toluene could reach as high as 476.2 mg/g. The results demonstrated that air oxidation coupling NH3 treatment is a highly effective method for the preparation of hierarchical porous biochar for enhancing toluene adsorption performance.
Bangda Wang; Fengli Gan; Zhongde Dai; Shenggui Ma; Wenhua Chen; Xia Jiang. Air oxidation coupling NH3 treatment of biomass derived hierarchical porous biochar for enhanced toluene removal. Journal of Hazardous Materials 2020, 403, 123995 .
AMA StyleBangda Wang, Fengli Gan, Zhongde Dai, Shenggui Ma, Wenhua Chen, Xia Jiang. Air oxidation coupling NH3 treatment of biomass derived hierarchical porous biochar for enhanced toluene removal. Journal of Hazardous Materials. 2020; 403 ():123995.
Chicago/Turabian StyleBangda Wang; Fengli Gan; Zhongde Dai; Shenggui Ma; Wenhua Chen; Xia Jiang. 2020. "Air oxidation coupling NH3 treatment of biomass derived hierarchical porous biochar for enhanced toluene removal." Journal of Hazardous Materials 403, no. : 123995.
In this study, three zeolitic imidazolate frameworks (ZIFs) with different shapes – particles (0D), microneedles (1D) and leaves (2D) - were synthesized by tuning the polymeric additive. These ZIFs have been dispersed into Pebax 2533 matrix with a loading varying from 0 to 20 wt.%. The resultant mixed matrix membranes (MMMs) have been systemically characterized by various techniques. Mixed gas permeation experiment was also employed to evaluate the CO2 separation performance. The results show that there exists an optimal ZIF loading for these three series of membranes, but the values are highly dependent on the morphologies of the added ZIFs. The membranes containing ZIF particles and microneedles display the highest CO2 permeability and CO2/N2 selectivity simultaneously at 10 wt.% loading, while a much lower loading, i.e., ~ 5 wt.% is the optimized value for ZIF leaves. Moreover, the increment in CO2 permeability is related to the ZIFs’ morphology and the order is 0D < 1D < 2D. On the other hand, the effects of the morphology on selectivity seems to be the opposite, with ZIF of 0D structure showing the highest selectivity. Moreover, the influences of adding ZIF fillers on the performances of the resultant MMMs under varied operating temperatures and the feed pressures were also investigated. The membrane with 10 wt.% 1D ZIF shows the highest increment in CO2 permeability (727.4 Barrer) with the CO¬2/N2 selectivity of ~ 14 at 60 oC.
Jing Deng; Zhongde Dai; Liyuan Deng. Effects of the Morphology of the ZIF on the CO2 Separation Performance of MMMs. Industrial & Engineering Chemistry Research 2020, 59, 14458 -14466.
AMA StyleJing Deng, Zhongde Dai, Liyuan Deng. Effects of the Morphology of the ZIF on the CO2 Separation Performance of MMMs. Industrial & Engineering Chemistry Research. 2020; 59 (32):14458-14466.
Chicago/Turabian StyleJing Deng; Zhongde Dai; Liyuan Deng. 2020. "Effects of the Morphology of the ZIF on the CO2 Separation Performance of MMMs." Industrial & Engineering Chemistry Research 59, no. 32: 14458-14466.
This study first develops a facile method to synthesize zeolitic imidazolate framework cuboid (ZIF-C) nanosheets with tunable thickness from 70 nm to 170 nm from an aqueous polymer solution. The obtained ZIF-C nanosheets were characterized by various techniques, including X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM), Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), N2 adsorption and Thermogravimetric analysis (TGA), to understand their compositional and structural properties. The synthesized ZIF-Cs nanosheets with different thicknesses were further applied as nanofillers to prepare Pebax-based mixed matrix membranes (MMMs) to study the effect of the morphology on membrane properties and CO2/N2 separation performances under different relative humidity conditions. Results reveal that the incorporation of these ZIF-Cs simultaneously enhances CO2 permeability and CO2/N2 selectivity in the mixed matrix membranes. In addition, MMMs with the thickest ZIF-C nanosheet presents better performance. A CO2 permeability of 387.2 Barrer accompanied with a CO2/N2 selectivity of 47.1 has been documented, nearly doubled in CO2 permeability with slightly increased selectivity compared with membranes containing thinner nanosheets.
Jing Deng; Zhongde Dai; Jingwei Hou; Liyuan Deng. Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO2 Separation. Chemistry of Materials 2020, 32, 4174 -4184.
AMA StyleJing Deng, Zhongde Dai, Jingwei Hou, Liyuan Deng. Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO2 Separation. Chemistry of Materials. 2020; 32 (10):4174-4184.
Chicago/Turabian StyleJing Deng; Zhongde Dai; Jingwei Hou; Liyuan Deng. 2020. "Morphologically Tunable MOF Nanosheets in Mixed Matrix Membranes for CO2 Separation." Chemistry of Materials 32, no. 10: 4174-4184.
Poly(ethylene glycol) (PEG)‐based membranes have obtained considerable attentions for CO2 separation for their promising CO2 separation performance and excellent thermal/chemical resistance. In this work, a one‐pot thiol–ene/epoxy reaction was used to prepare crosslinked PEG‐based and PEG/ionic liquids (ILs) blend membranes. Four ILs of the same cation [Bmim]+ with different anions ([BF4]−, [PF6]−, [NTf2]−, and [TCM]−) were chosen as the additives. The chemical structure, thermal properties, hydrophilicity, and permeation performance of the resultant membranes were investigated to study the ILs' effects. An increment in CO2 permeability (~34%) was obtained by optimizing monomer ratios and thus crosslinking network structures. Adding ILs into optimized PEG matrix shows distinct influences in CO2 separation performance depending on the anions' types, due to the different CO2 affinities and compatibilities with PEG matrix. Among these ILs, [Bmim][NTf2] was found the most effective in enhancing CO2 transport by simultaneously increasing the solubility and diffusivity of CO2. © 2020 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2020
Jing Deng; Zhongde Dai; Liyuan Deng. Synthesis of crosslinked PEG/IL blend membrane via one‐pot thiol–ene/epoxy chemistry. Journal of Polymer Science 2020, 58, 2575 -2585.
AMA StyleJing Deng, Zhongde Dai, Liyuan Deng. Synthesis of crosslinked PEG/IL blend membrane via one‐pot thiol–ene/epoxy chemistry. Journal of Polymer Science. 2020; 58 (18):2575-2585.
Chicago/Turabian StyleJing Deng; Zhongde Dai; Liyuan Deng. 2020. "Synthesis of crosslinked PEG/IL blend membrane via one‐pot thiol–ene/epoxy chemistry." Journal of Polymer Science 58, no. 18: 2575-2585.
Ragne Marie Lilleby Helberg; Zhongde Dai; Luca Ansaloni; Liyuan Deng. PVA/PVP blend polymer matrix for hosting carriers in facilitated transport membranes: Synergistic enhancement of CO2 separation performance. Green Energy & Environment 2020, 5, 59 -68.
AMA StyleRagne Marie Lilleby Helberg, Zhongde Dai, Luca Ansaloni, Liyuan Deng. PVA/PVP blend polymer matrix for hosting carriers in facilitated transport membranes: Synergistic enhancement of CO2 separation performance. Green Energy & Environment. 2020; 5 (1):59-68.
Chicago/Turabian StyleRagne Marie Lilleby Helberg; Zhongde Dai; Luca Ansaloni; Liyuan Deng. 2020. "PVA/PVP blend polymer matrix for hosting carriers in facilitated transport membranes: Synergistic enhancement of CO2 separation performance." Green Energy & Environment 5, no. 1: 59-68.
The transition toward sustainable processing entails the use of biobased alternatives as functional materials to reduce the overall carbon footprint. Nanocellulose, due to its natural availability, biodegradability, excellent mechanical properties, tunable surface, and high aspect ratio, is attracting more and more interest as a nanoscale additive in polymeric membranes. In this work, an effective way to modify nanocellulose fibril surfaces for performance enhancement in CO2 separation membranes has been demonstrated. The functionalization promptly triggered intrinsic property responses in favor of nanofiber dispersion and CO2 transport. Thin composite membranes containing the modified nanofibers in water-swelling poly(vinyl alcohol) (PVA) as well as in the blend of sterically hindered polyallylamine (SHPAA) and PVA were fabricated and tested using humid gas permeation tests. Defect-free ultrathin (300 nm) hybrid selective layers containing evenly distributed nanofibers were successfully coated. The addition of nanocellulose exhibited enhanced CO2 permeance and CO2/N2 selectivity compared to those of the neat PVA membranes. CO2 permeance up to 652 GPU and a CO2/N2 selectivity of 41.3 with SHPAA/PVA blend were documented. Functionalization plays a categorical role in the dispersion of nanocellulose fibrils in the SHPAA/PVA blend, increasing the steric stabilization and interface compatibility with the polymer matrix. The tuned interface with PEG groups act as sites for water clusters retention and increased CO2 solubility, thus creating fast diffusion pathways for CO2 transport.
Saravanan Janakiram; Xinyi Yu; Luca Ansaloni; Zhongde Dai; Liyuan Deng. Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces 2019, 11, 33302 -33313.
AMA StyleSaravanan Janakiram, Xinyi Yu, Luca Ansaloni, Zhongde Dai, Liyuan Deng. Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces. 2019; 11 (36):33302-33313.
Chicago/Turabian StyleSaravanan Janakiram; Xinyi Yu; Luca Ansaloni; Zhongde Dai; Liyuan Deng. 2019. "Manipulation of Fibril Surfaces in Nanocellulose-Based Facilitated Transport Membranes for Enhanced CO2 Capture." ACS Applied Materials & Interfaces 11, no. 36: 33302-33313.
In the present study, the poly(ethylene glycol) (PEG) functionalized carbon nanotubes (CNT-PEG) was used as nano-additives to fabricate hybrid membranes for enhanced CO2 separation in Pebax® 1657 matrix. The resultant membranes were characterized using various techniques. It is found out that grafting PEG onto CNT fibers greatly improves the CNT dispersion; No noticeable aggregation can be found in the hybrid membranes with the CNT-PEG content of up to 20 wt.%. XRD results denote that the CNT-PEG in the Pebax® matrix increases the amorphous phase content, which is beneficial for CO2 permeation. Gas permeation properties were investigated using mixed gas permeation tests at different relative humidity conditions. It is found out that CO2 permeability first increases then decreases with increasing CNT-PEG content at the dry state. The water vapor in the gas stream further improves the CO2 permeability. At 100% RH, CO2 permeability of 369.1 Barrer with CO2/N2 selectivity of 110.8 was obtained for a hybrid membrane containing 3 wt.% CNT-PEG, which overcomes the Robeson upper bound. The combination of high permeability and selectivity makes the Pebax/CNT-PEG hybrid membranes promising for industrial CO2 separation applications.
Zhongde Dai; Jing Deng; Kang-Jen Peng; Ying-Ling Liu; Liyuan Deng. Pebax/PEG Grafted CNT Hybrid Membranes for Enhanced CO2/N2 Separation. Industrial & Engineering Chemistry Research 2019, 58, 12226 -12234.
AMA StyleZhongde Dai, Jing Deng, Kang-Jen Peng, Ying-Ling Liu, Liyuan Deng. Pebax/PEG Grafted CNT Hybrid Membranes for Enhanced CO2/N2 Separation. Industrial & Engineering Chemistry Research. 2019; 58 (27):12226-12234.
Chicago/Turabian StyleZhongde Dai; Jing Deng; Kang-Jen Peng; Ying-Ling Liu; Liyuan Deng. 2019. "Pebax/PEG Grafted CNT Hybrid Membranes for Enhanced CO2/N2 Separation." Industrial & Engineering Chemistry Research 58, no. 27: 12226-12234.
Due to the high specific surface area, high mechanical strength and broad possibility of surface modification, nanocellulose has obtained much attention as a new class of bio-based nanomaterials with promising potential in a wide variety of applications. Recently, a considerable amount of research has been aimed to the fabrication of nanocellulose based hybrid membranes for water treatment. However, nanocellulose based hybrid gas separation membrane is still a new research area. Herein, we force on recent advancements in the fabrication methods and separation performances of nanocellulose-based hybrid membranes for CO2 separation, the transport mechanisms involved, along with the challenges in the utilization of nanocellulose in membranes. Finally, some perspectives on future R&D of nanocellulose-based membranes for CO2 separation are proposed.
Zhongde Dai; Vegar Ottesen; Jing Deng; Ragne M. Lilleby Helberg; Liyuan Deng. A Brief Review of Nanocellulose Based Hybrid Membranes for CO2 Separation. Fibers 2019, 7, 40 .
AMA StyleZhongde Dai, Vegar Ottesen, Jing Deng, Ragne M. Lilleby Helberg, Liyuan Deng. A Brief Review of Nanocellulose Based Hybrid Membranes for CO2 Separation. Fibers. 2019; 7 (5):40.
Chicago/Turabian StyleZhongde Dai; Vegar Ottesen; Jing Deng; Ragne M. Lilleby Helberg; Liyuan Deng. 2019. "A Brief Review of Nanocellulose Based Hybrid Membranes for CO2 Separation." Fibers 7, no. 5: 40.
Polyethylene glycol (PEG)-based membranes have recently been reported with excellent CO2 separation performances. However, the commonly exhibited high crystallinity may deteriorate the gas permeation properties in this type of membranes. In this work, a two-stage cross-linking method was employed to fabricate PEG membranes with interpenetrating networks to reduce the crystallinity, and ionic liquids (ILs) were incorporated into the resultant membranes to increase the diffusivity and the CO2 affinity of the membranes. By increasing the length of the PEG-based acrylate monomers and optimizing the ratio of the amine cross-linker to the acrylate monomers, CO2 permeability of the resultant membranes was significantly enhanced (from 0.59 to 85.02 Barrer) with slightly increased CO2/N2 selectivity. Four conventional ILs with different anions were added into the optimized cross-linked PEG membranes. The addition of ILs endows superior gas transport properties at high loadings and the [Bmim][TCM] gives the best CO2 separation performance of the membranes; CO2 permeability of up to 134.22 Barrer with the CO2/N2 selectivity of 49.5 was documented. The anions were found contributing the most in promoting the CO2 permeation.
Jing Deng; Junbo Yu; Zhongde Dai; Liyuan Deng. Cross-Linked PEG Membranes of Interpenetrating Networks with Ionic Liquids as Additives for Enhanced CO2 Separation. Industrial & Engineering Chemistry Research 2019, 58, 5261 -5268.
AMA StyleJing Deng, Junbo Yu, Zhongde Dai, Liyuan Deng. Cross-Linked PEG Membranes of Interpenetrating Networks with Ionic Liquids as Additives for Enhanced CO2 Separation. Industrial & Engineering Chemistry Research. 2019; 58 (13):5261-5268.
Chicago/Turabian StyleJing Deng; Junbo Yu; Zhongde Dai; Liyuan Deng. 2019. "Cross-Linked PEG Membranes of Interpenetrating Networks with Ionic Liquids as Additives for Enhanced CO2 Separation." Industrial & Engineering Chemistry Research 58, no. 13: 5261-5268.
Nanocellulose is a promising and sustainable bio-based nanomaterial due to its excellent mechanical properties, biocompatibility, natural abundance, and especially its high aspect ratio. Interest in applying nanocellulose as nanofillers in membrane fabrication has been growing rapidly in recent years. In the present work, nanocellulose crystals (CNC) and nanocellulose fibers (CNF) were incorporated into polyvinyl alcohol (PVA) to prepare evenly dispersed nanocomposite. The resultant nanocomposite materials containing up to 80 wt% of nanocellulose were coated as defect-free, thin-film-composite (TFC) selective layers onto hollow fiber membrane substrates via dip-coating for efficient CO2 capture. TGA, FTIR, XRD, STEM, SEM, and humid mixed gas permeation test were used to evaluate the nanocomposite materials and the membranes. The resultant PVA/CNC nanocomposite membranes exhibit both higher CO2 permeance and CO2/N2 selectivity compared to the PVA/CNF membranes and the neat PVA membranes. The addition of CNC showed more positive effects on the CO2 permeation compared to CNF. Under optimized conditions, CO2 permeance of 672 GPU with a CO2/N2 selectivity of 43.6 was obtained with a PVA/CNC membrane. Excellent long-term stability of the membrane was also documented within a period of up to one year. The interface between the polymer phase and the charged nanocellulose fibers is believed to form fast gas transport channels at humid state and thus enhances CO2 permeation.
Zhongde Dai; Jing Deng; Qiang Yu; Ragne M Lilleby Helberg; Saravanan Janakiram; Luca Ansaloni; Liyuan Deng. Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces 2019, 11, 10874 -10882.
AMA StyleZhongde Dai, Jing Deng, Qiang Yu, Ragne M Lilleby Helberg, Saravanan Janakiram, Luca Ansaloni, Liyuan Deng. Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture. ACS Applied Materials & Interfaces. 2019; 11 (11):10874-10882.
Chicago/Turabian StyleZhongde Dai; Jing Deng; Qiang Yu; Ragne M Lilleby Helberg; Saravanan Janakiram; Luca Ansaloni; Liyuan Deng. 2019. "Fabrication and Evaluation of Bio-Based Nanocomposite TFC Hollow Fiber Membranes for Enhanced CO2 Capture." ACS Applied Materials & Interfaces 11, no. 11: 10874-10882.
For nearly two decades, membranes derived from polyethers have served as promising candidate materials for CO2 separation. Due to the inherent tendency of high-molecular-weight poly(ethylene oxide) (PEO) to crystallize and thus reduce its CO2 permeability, prior studies have focused on membranes produced from low-molecular-weight poly(ethylene glycol) (PEG). In this work, a novel series of cross-linked PEG-based membranes composed of interpenetrating polymer networks has been generated through the use of amine-terminated Jeffamine and multiple acrylate-functionalized cross-linkers in a facile, solvent-free, two-stage reaction. Evidence of cross-linked interpenetrating polymer networks formed by aza-Michael addition and acrylate polymerization is confirmed by real-time Fourier-transform infrared spectroscopy. In addition, we systematically investigate the thermal stability, crystallization, mechanical properties, and water sorption of these multicomponent membranes. Corresponding CO2 and N2 transport properties, evaluated by single-gas permeation tests, are found to depend on both the chemical nature of the cross-linkers and the ratio of the interpenetrating networks. Moreover, free PEG dimethyl ether has been added into the optimized cross-linked matrix at different loading levels to further enhance the gas transport properties.
Jing Deng; Zhongde Dai; Jiaqi Yan; Marius Sandru; Eugenia Sandru; Richard J. Spontak; Liyuan Deng. Facile and solvent-free fabrication of PEG-based membranes with interpenetrating networks for CO2 separation. Journal of Membrane Science 2018, 570-571, 455 -463.
AMA StyleJing Deng, Zhongde Dai, Jiaqi Yan, Marius Sandru, Eugenia Sandru, Richard J. Spontak, Liyuan Deng. Facile and solvent-free fabrication of PEG-based membranes with interpenetrating networks for CO2 separation. Journal of Membrane Science. 2018; 570-571 ():455-463.
Chicago/Turabian StyleJing Deng; Zhongde Dai; Jiaqi Yan; Marius Sandru; Eugenia Sandru; Richard J. Spontak; Liyuan Deng. 2018. "Facile and solvent-free fabrication of PEG-based membranes with interpenetrating networks for CO2 separation." Journal of Membrane Science 570-571, no. : 455-463.
Poly(1-trimethylsilyl-1-propyne) (PTMSP) is a high free volume polymer with exceptionally high gas permeation rate but the serious aging problem and low selectivity have limited its application as CO2 separation membrane material. Incorporating inorganic nanoparticles in polymeric membranes has been a common approach to improve the separation performance of membranes, which has also been used in PTMSP based membrane but mostly with respect to tackling the aging issues. Aiming at increasing the CO2 selectivity, in this work, hybrid membranes containing four types of selected nanofillers (from 0 to 3D) were fabricated using PTMSP as the polymer matrix. The effects of the various types of nanofillers on the CO2 separation performance of the resultant membranes were systematically investigated in humid conditions. The thermal, chemical and morphologic properties of the hybrid membranes were characterized using TGA, FTIR and SEM. The gas permeation properties of the hybrid membranes were evaluated using mixed gas permeation test with the presence of water vapour to simulate the flue gas conditions. Experiments show that the addition of different fillers results in significantly different separation performances; The addition of ZIF-L porous 2D filler improves the CO2/N2 selectivity at the expenses of CO2 permeability, while the addition of TiO2, ZIF-7 and ZIF-8 increases the CO2 permeability but the CO2/N2 selectivity decreases.
Zhongde Dai; Vilde Løining; Jing Deng; Luca Ansaloni; Liyuan Deng. Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation. Membranes 2018, 8, 76 .
AMA StyleZhongde Dai, Vilde Løining, Jing Deng, Luca Ansaloni, Liyuan Deng. Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation. Membranes. 2018; 8 (3):76.
Chicago/Turabian StyleZhongde Dai; Vilde Løining; Jing Deng; Luca Ansaloni; Liyuan Deng. 2018. "Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation." Membranes 8, no. 3: 76.
Zhongde Dai; Gøril Flatberg; Heinz A. Preisig; Liyuan Deng. Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy. Journal of Laboratory Chemical Education 2018, 6, 141 -147.
AMA StyleZhongde Dai, Gøril Flatberg, Heinz A. Preisig, Liyuan Deng. Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy. Journal of Laboratory Chemical Education. 2018; 6 (5):141-147.
Chicago/Turabian StyleZhongde Dai; Gøril Flatberg; Heinz A. Preisig; Liyuan Deng. 2018. "Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy." Journal of Laboratory Chemical Education 6, no. 5: 141-147.
Numerical weather and climate use sophisticated mathematical models. These models are employed to simulate the atmospheric dynamics to perform a medium-range forecasting and climate prediction. Such an approach allows to estimate all meteorological variables for a future time period: wind fields, air temperature, pressure, moisture, and precipitation field. Precipitation is one of the most difficult fields for prediction. The latter statement is verified due to high variability in space and time. However, precipitation is a key issue in many activities of society. An alternative approach for climate prediction to the precipitation field is to employ the Artificial Neural Network (ANN). Such technique has a reduced computational cost in comparison with time integration of the partial differential equations. One challenge to employ an ANN is to determine the topology or configuration of a neural network. Here, a supervised ANN is designed to perform the precipitation prediction looking at two different periods: monthly and seasonal precipitation. The method is applied to the Southern region of Brazil. The definition of the neural network topology is addressed as an optimization problem. The best configuration is computed by minimizing a cost function. The optimization problem is solved by a new meta-heuristic: Multi-Particle Collision Algorithm (MPCA). In addition, a technique based on rough set theory is used to reduce the data space dimension. The predicted precipitation is evaluated by comparison with measured data. The prediction is also evaluated using full and reduced input data for a neural predictive model.
Zhongde Dai; Gøril Flatberg; Heinz A. Preisig; Liyuan Deng; J. A. Anochi; H. F. Campos Velho. Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy. Journal of Laboratory Chemical Education 2018, 6, 141 -147.
AMA StyleZhongde Dai, Gøril Flatberg, Heinz A. Preisig, Liyuan Deng, J. A. Anochi, H. F. Campos Velho. Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy. Journal of Laboratory Chemical Education. 2018; 6 (5):141-147.
Chicago/Turabian StyleZhongde Dai; Gøril Flatberg; Heinz A. Preisig; Liyuan Deng; J. A. Anochi; H. F. Campos Velho. 2018. "Kinetic Studies of Fenton Oxidation Reaction by UV-VIS Spectroscopy." Journal of Laboratory Chemical Education 6, no. 5: 141-147.
Application of conventional polymeric membranes in CO2 separation processes are limited by the existing trade-off between permeability and selectivity represented by the renowned upper bound. Addition of porous nanofillers in polymeric membranes is a promising approach to transcend the upper bound, owing to their superior separation capabilities. Porous nanofillers entice increased attention over nonporous counterparts due to their inherent CO2 uptake capacities and secondary transport pathways when added to polymer matrices. Infinite possibilities of tuning the porous architecture of these nanofillers also facilitate simultaneous enhancement of permeability, selectivity and stability features of the membrane conveniently heading in the direction towards industrial realization. This review focuses on presenting a complete synopsis of inherent capacities of several porous nanofillers, like metal organic frameworks (MOFs), Zeolites, and porous organic frameworks (POFs) and the effects on their addition to polymeric membranes. Gas permeation performances of select hybrids with these three-dimensional (3D) fillers and porous nanosheets have been summarized and discussed with respect to each type. Consequently, the benefits and shortcomings of each class of materials have been outlined and future research directions concerning the hybrids with 3D fillers have been suggested.
Mahdi Ahmadi; Saravanan Janakiram; Zhongde Dai; Luca Ansaloni; Liyuan Deng. Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review. Membranes 2018, 8, 50 .
AMA StyleMahdi Ahmadi, Saravanan Janakiram, Zhongde Dai, Luca Ansaloni, Liyuan Deng. Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review. Membranes. 2018; 8 (3):50.
Chicago/Turabian StyleMahdi Ahmadi; Saravanan Janakiram; Zhongde Dai; Luca Ansaloni; Liyuan Deng. 2018. "Performance of Mixed Matrix Membranes Containing Porous Two-Dimensional (2D) and Three-Dimensional (3D) Fillers for CO2 Separation: A Review." Membranes 8, no. 3: 50.
Membrane technology has the potential to be an eco-friendly and energy-saving solution for the separation of CO2 from different gaseous streams due to the lower cost and the superior manufacturing features. However, the performances of membranes made of conventional polymers are limited by the trade-off between the permeability and selectivity. Improving the membrane performance through the addition of nanofillers within the polymer matrix offers a promising strategy to achieve superior separation performance. This review aims at providing a complete overview of the recent advances in nanocomposite membranes for enhanced CO2 separation. Nanofillers of various dimensions and properties are categorized and effects of nature and morphology of the 0D to 2D nanofillers in the corresponding nanocomposite membranes of different polymeric matrixes are discussed with regard to the CO2 permeation properties. Moreover, a comprehensive summary of the performance data of various nanocomposite membranes is presented. Finally, the advantages and challenges of various nanocomposite membranes are discussed and the future research and development opportunities are proposed.
Saravanan Janakiram; Mahdi Ahmadi; Zhongde Dai; Luca Ansaloni; Liyuan Deng. Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review. Membranes 2018, 8, 24 .
AMA StyleSaravanan Janakiram, Mahdi Ahmadi, Zhongde Dai, Luca Ansaloni, Liyuan Deng. Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review. Membranes. 2018; 8 (2):24.
Chicago/Turabian StyleSaravanan Janakiram; Mahdi Ahmadi; Zhongde Dai; Luca Ansaloni; Liyuan Deng. 2018. "Performance of Nanocomposite Membranes Containing 0D to 2D Nanofillers for CO2 Separation: A Review." Membranes 8, no. 2: 24.
Fully hydrated hybrid membranes based on a polyelectrolyte mixed with an ionic liquid possess gas permeation properties of significant interest for CO2 capture applications.
Zhongde Dai; Luca Ansaloni; Justin J. Ryan; Richard J. Spontak; Liyuan Deng. Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor. Green Chemistry 2018, 20, 1391 -1404.
AMA StyleZhongde Dai, Luca Ansaloni, Justin J. Ryan, Richard J. Spontak, Liyuan Deng. Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor. Green Chemistry. 2018; 20 (6):1391-1404.
Chicago/Turabian StyleZhongde Dai; Luca Ansaloni; Justin J. Ryan; Richard J. Spontak; Liyuan Deng. 2018. "Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor." Green Chemistry 20, no. 6: 1391-1404.