Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 32
·16746-16761
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IF 7.443
Jiayou Liao,Zhi Wang,Chengyun Gao,Ming Wang,Kai Yan,Xianmei Xie,Song Zhao,Jixiao Wang,Shichang Wang
A PVAm–HT membrane is fabricated by establishing a hydrotalcite (HT) channel in a polyvinylamine (PVAm) fixed carrier membrane. The flexible PVAm fixed carrier membrane material as a matrix membrane is beneficial to get high permeance. Simultaneously, the HT channels can be used as high-speed facilitated transport channels, in which the movable carbonate can actively meet CO2 and help to increase the CO2/N2 selectivity of membranes as in liquid membranes or in ion exchange membranes. Moreover, the unobstructed HT channels are conducive to transport CO2 rapidly and they can increase the chain spacing of polymers; these are beneficial to further enhance the permeance of membranes. In addition, the charged layers of HT provide necessary stability for movable carriers due to the electrostatic attraction. Thus, the PVAm–HT membrane obtains high permeance and high selectivity, as well as good stability. The CO2 permeance of the PVAm–HT membrane reaches 3187 GPU and the CO2/N2 selectivity of the PVAm–HT membrane reaches 296 at 0.11 MPa.
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RSC Advances
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2015
·Vol. 5
·期 42
·32902-32908
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IF 3.84
Teng Xu,Qinghua Wu,Shuixia Chen,Mengwei Deng
Ring-opening copolymerization of aziridine in situ into substrates to introduce polyethyleneimine (PEI) not only required strict experimental conditions but employed the highly toxic monomer aziridine. In this paper, an effective and safe new procedure is developed for hyperbranched structure synthesis by stepwise growth using N-(2-chloroethyl)-benzaldimine as a monomer. Hyperbranched solid amine fibers for CO2 capture were prepared through co-irradiation grafting copolymerization of polypropylene fibers with glycidyl methacrylate, followed by amination with ethylenediamine, Hoffman alkylation with N-(2-chloroethyl)-benzaldimine and then hydrolysis to remove benzaldehyde groups. It was shown that the adsorption performance of the hyperbranched solid amine fibers G2.0 and G3.0 has been greatly improved compared with first generation G1.0 fibers, and the adsorption capacities of G2.0 and G3.0 were 5.35 mmol g−1 and 5.53 mmol g−1 at 30 °C, respectively. The amine utilization of G2.0 fibers could reach 84.1%. These results demonstrate that the branched structure can promote the adsorption capacity and efficiency greatly due to its low mass transfer resistance of CO2, which is more favorable than a linear amination reagent.
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JOURNAL OF POROUS MATERIALS
·
2015
·Vol. 23
·期 2
·529-537
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IF 1.108
Ma Beibei,Zhuang Linzhou,Chen Shuixia
The well-ordered hexagonal short-pore SBA-15 (SSBA-15) has been successfully synthesized via an energy-efficient process under the microwave-hydrothermal condition, in which the formation duration [stirring duration (ripening step) and microwave-hydrothermal treatment duration (aging step)] has been greatly decreased from 48 h for conventional hydrothermal treatment to <2 h. The extension of the ripening duration led to the evidently improved uniformity and regularity of particles while the increase of aging duration resulted in less intrawall pores and more structural mesopores. The optimal condition to get highly ordered SSBA-15 in this work was the duration of 2 h for both steps, and the SSBA-15 obtained was composed of cuboid-like particles, whose pore length was ca. 450 ± 50 nm and pore size was around 10 nm. The SSBA-15 was modified with different amine agents to prepare solid amine adsorbent, the obtained adsorbents showed considerable CO 2 adsorption ability, indicating that this fast-prepared SSBA-15 can be a promising support of CO 2 adsorbents.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Yangyang Bian,Yue Zhao,Shufeng Shen
Potassium prolinate + water + ethanol (ProK/W/Eth) solution has potential use as a liquid-to-solid phase-changing absorbent for energy-efficient CO2 capture process. In this study, the equilibrium solubility of CO2 in ProK/W/Eth solutions was measured in a stirred equilibrium cell at a temperature range from 293 to 343 K and CO2 partial pressures up to 200 kPa. Density and viscosity were also measured at temperatures from 293 to 333 K and ProK molality up to 6.09 mol·kg–1 ethanol. Moreover, the CO2 loading and cyclic capacity were compared with aqueous monoethanolamine (MEA) and aqueous ProK solution. The solubility data were well-represented using a Soft model with AAD within 8.0%. The data of density and viscosity were also correlated with empirical models. The predicted results matched well the experimental data with AAD within 0.37% for density and 1.38% for viscosity.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 84
·期 3
·422-431
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IF 1.575
Kong Yong,Zhang Jiayue,Shen Xiaodong
Abstract Amine hybrid titania/silsesquioxane composite aerogel (AHTSA) was prepared by an one-pot sol–gel process without any catalyst. The sol-gel reaction mechanism of AHTSA was proposed. The use of 3-aminopropyltriethoxysilane (APTES) plays as an “internal catalyst” and promotes the formation of gel during sol–gel process. The morphology, microstructure, pore structure and CO 2 capture performances of AHTSA were investigated. AHTSA exhibits microstructure of the typical silica aerogels with colloidal structure. Moreover, AHTSA has a large number of macropores which favor the CO 2 adsorption. Thermogravimetric analysis reveals that AHTSA has a high CO 2 /N 2 selectivity in CO 2 /N 2 mixture gas. CO 2 adsorption capacity with dry and humid 1 vol% CO 2 is as high as 4.19 and 5.04 mmol/g, respectively. Correspondingly, amine efficiency under dry and humid conditions is 0.37 and 0.44, respectively. AHTSA has very short adsorption halftime below 4 min, and its CO 2 adsorption capacity do not show obvious attenuation after 30 adsorption-regeneration cycles, indicating AHTSA is a dynamic and regenerable sorbent. Graphical abstract
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Journal of CO2 Utilization
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2016
·
IF 4.764
Xiying Fu,Dagang Zhou,Kai Wang,Huanwang Jing
Pd/C was found to be an excellent catalyst in the coupling reaction of carbon dioxide and epoxides with tetrabutylammonium iodide (TBAI) as cocatalyst and the corresponding cyclic carbonates were obtained in good yields and high selectivities. 3-Chloropropylene carbonate was synthesized under extremely mild conditions of room temperature and atmosphere. The proposed mechanism was also calculated and confirmed by DFT. The palladium catalyst could be simply recycled and reused for 5 times without significant loss of activity.
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APPLIED ENERGY
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2017
·
IF 7.182
Yanping Ren,Ruiyu Ding,Hairong Yue,Siyang Tang,Changjun Liu,Jinbo Zhao,Wen Lin,Bin Liang
Amine-functionalized nanomaterials have significant potential in CO 2 capture technology because of their low energy consumption, stable performance, and high regeneration capacity. Novel amine-functionalized adsorbents composed of copper silicate nanospheres (CSNSs) grafted with mono-, di- and tri-aminosilanes were synthesized for CO 2 capture. The synthetic process and formation mechanism were systematically investigated using transmission electron microscopy, X-ray photoelectron spectroscopy, fourier transform infrared spectroscopy, and N 2 physisorption analysis, etc. The copper silicates with rich surface hydroxyl groups, significant surface areas and mesoporous structures facilitated chemical modification of amines, leading to a high CO 2 adsorption capacity (a maximum CO 2 uptake of 47.88 mg/g) and excellent cyclic regenerability (maximum deviation of 3.51% after 20-times test) for CSNS-TA. In addition, the CO 2 capture process was carried out under relatively mild conditions, e.g., adsorption at 298 K, desorption at 373 K and ambient pressure , suggesting that these amine-modified CSNSs have potential as solid sorbents for CO 2 capture.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Wei He,Fan Zhang,Zhi Wang,Wei Sun,Zhiyong Zhou,Zhongqi Ren
Carbon capture and sequestration (CCS) has become an increasingly important technology for environmental protection and resource utilization. In this work, four task-specific ionic liquids (TSILs), NH2-functionalized IL and three ether-functionalized ILs, were synthesized for CO2 absorption. CO2 absorption experiments of these task-specific ionic liquids (TSILs) showed that the absorption performance of NH2-functionalized IL was higher than that of ether-functionalized ILs. The recycling experiments of CO2 absorption demonstrated a good reusability of synthesized TSILs for CO2 absorption. Supported ionic liquid membranes (SILMs) with synthesized TSILs were prepared, and the CO2/CH4 and CO2/N2 separation performance of SILMs was examined. Results indicated that the SILMs with ether-functionalized ILs have slightly lower permeability but much higher selectivity (up to 9.7) than the SILMs with NH2-functionalized IL. Poly(RTIL)-RTIL composite membranes were prepared using ether-functionalized ILs. The effect of cross-linking monomer content and nonpolymerizable IL (“free” IL) content in poly(RTIL)-RTIL membranes on the CO2/CH4 and CO2/N2 separation performance was investigated. The composite membranes have higher gas permeability with little or no sacrifice in selectivity compared with SILMs. The stability evaluation and comparison of the SILMs and poly(RTIL)-RTIL membranes were conducted, the results of which verified the stronger structural stability of the poly(RTIL)-RTIL membranes. This suggests the potential of poly(RTIL)-RTIL membranes in future CO2-selective membrane separation.
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LANGMUIR
·
2016
·
IF 3.993
Yunlei Shi,Dazhen Xiong,Huiyong Wang,Yang Zhao,Jianji Wang
The creation of CO2-responsive materials that undergo structural transition between micelle and vesicle is of great importance from both theoretical and practical points of view. In this work, we have developed a series of CO2-responsive single-tailed amphiphilic ionic liquids (ILs) composed of N-alkyl-N-methyldiethanolamine cation [CnMDEA]+ (n = 8, 10, 12, 14, 16, 18) and 2-pyrrolidinone [2-Pyr]− anion. The aggregation behavior and self-assembly structures of the ILs in aqueous solution have been investigated by conductivity, surface tension, dynamic light scattering, cryogenic transmission electron microscopy, small-angle X-ray scattering, and nuclear magnetic resonance spectroscopy. For the first time, CO2 driven reversible switching of self-assembly between spherical micelle and unilamellar vesicle is found for [CnMDEA][2-Pyr] (n = 16, 18) in aqueous solutions at 20 °C and atmospheric pressure. It is shown that the mechanism behind the reversible micelle to vesicle transition involves the formation of carbamate anion from the reaction between [2-Pyr]− and CO2.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9544-9552
·
IF 8.867
Ying Pan,Yuxin Zhao,Shanjun Mu,Yu Wang,Chunming Jiang,Quanzhen Liu,Qianrong Fang,Ming Xue,Shilun Qiu
A new strategy was developed to introduce active site K+ into the pores of MOF precursors, and various N-doped hierarchical porous carbons were prepared in a one-step synthetic route. The effect of K+in situ activation on the textural properties of the derived porous carbons was studied systematically, and the CO2 capture properties and electrochemical performance of these porous carbons were enhanced for their application in supercapacitors. The KBM-700 sample derived from K@bio-MOF-1 (potassium-ion-exchanged bio-MOF-1), which had high nitrogen content (10.16%) and micropore volume (73%), exhibited good CO2 uptakes (4.75 mmol g−1), and high adsorption selectivity for CO2/N2 at 298 K and 1 bar (Sads = 99.1) as well as high specific capacitance (230 F g−1) and excellent electrochemical cycling stability (97% retention after cycling 10 000 times).
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2016
·
IF 1.835
Yangyang Bian,Shufeng Shen,Yue Zhao,Ya-nan Yang
Aqueous amino acid salt (AAS) solutions could be attractive absorbents for CO2 removal from flue gases. Density, viscosity, and solubility of N2O in aqueous potassium salts of lysine, histidine, and arginine were measured over the temperature range from (293 to 353) K and molality concentration range from (0.26 to 3.6) mol·kg–1. Experimental results were correlated well with empirical correlations. The ion specific parameters (hAA–), based on the Weisenberger and Schumpe model, were fitted using the solubility data of N2O in the aforementioned AAS systems, valid up to 328 K. The models using temperature dependence of hAA– predict well within 2.5% AAD. The physical solubility of CO2 in the aqueous AAS solutions was also estimated.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Dong Fu,LeMeng Wang,ChenLu Mi,Pan Zhang
The absorption capacity of CO 2 in piperazine (PZ) promoted 2-diethylaminoethanol (DEAE) aqueous solution was measured. The viscosities of both CO 2 -unloaded and CO 2 -loaded PZ-DEAE aqueous solutions were measured and then modelled. The temperatures ranged from 303.2 K to 323.2 K. The mass fraction of PZ and DEAE respectively ranged from 0 to 0.075 and 0.3 to 0.5. The temperature and concentration dependences of absorption capacity were determined. The effects of temperature, mass fraction and CO 2 loading on viscosities are demonstrated.
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