APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Chunling Li,Zhikun Wang,Wendong Wang,Huafeng Zhu,Shuangqing Sun,Songqing Hu
Synergism has developed to be an important means to improve the foaming, stabilizing and responsive deforming characteristics of foam. Here, CO 2 /N 2 responsive surfactants with tunable lengths of carbon chains are synthesized. Through forming and deforming testing, the obtained 11-dimethylamino-undecyl sulfate sodium (11-DUSNa) with 11 carbons on the linear tail chain has the best comprehensive performance. 11-DUSNa is then mixed with Cocamidopropyl Hydroxyl Sulfobetaine (CHSB) to produce a compound foam with enhanced temperature and salt tolerance. Experimental observations show that the compound foam has the largest stability by adding 3.2 mol/L divalent salts (Ca 2+ , Mg 2+ ), and has improved temperature resistance from 20 to 100 °C compared to singular surfactant foam. The compound foam defoams in response to the injection of CO 2 within 2200 s. The foaming and defoaming processes can be cycled many times by repeat addition of NaOH for deprotonation and CO 2 for protonation of amino groups. Molecular dynamics simulations show that Ca 2+ and Mg 2+ cations distributing around the head groups of surfactants form a stable network liquid film wall, explaining why the compound foam is salt tolerant. The synergistic effect of CHSB and anions increases the liquid film wall thickness and therefore leads to better temperature resistance.
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Imran Khan Swati,Qazi Sohaib,Hayat Khan,Mohammad Younas,Afshin Hosseini Monjezi,Jianxin Li,Mashallah Rezakazemi
Post-combustion carbon-capturing (PCC) is one of the technologies that has been expanded in recent years, to control greenhouse gas emissions. This work aims to explore the potential applications of polymeric hydrophobic membranes and green ionic liquids (ILs). Experiments were conducted on lab-scale flat sheet (FS) membrane contactors (MCs) where CO 2 was captured from a continuous feed mixture (CO 2 + N 2 ) with a recirculated-based aqueous solution of IL at a constant temperature of 298 K and with no pressure driving force. The effects of contact angle, liquid entry pressure (LEP), initial CO 2 concentration, and type of solvents and membrane material on the CO 2 capture efficiency and membrane wetting in the PCC process have been experimentally investigated and evaluated. Polytetrafluoroethylene (PTFE) has shown the most hydrophobic property with 6–17 O loss in the contact angle. Furthermore, 1-Methyl-3-octyl-imidazolium-tetrafluoroborate ([OMIM][BF 4 ]) and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF 6 ]) have exhibited only 5–8 % loss in LEP using PTFE membrane support. The CO 2 capture efficiency has been achieved as 80.8–99.8 % in different combinations of ILs and membrane support keeping all other variables constant. While increasing CO 2 concentration from 15 to 45 % vol., an increase of nearly three folds in the CO 2 mass transfer flux was observed. Combination of [OMIM][BF 4 ] and PTFE membrane witnessed good long-term stability with only 20 % loss in CO 2 capture efficiency in 480 min of continuous operation.
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2019
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IF 8.456
Junjie Liu,Ning Qi,Bo Zhou,Zhiquan Chen
A series of amorphous melamine-based polymer networks synthesized by Schiff base chemistry (SNW) were successfully prepared by varying the strut length. The pore structure was analyzed by gas adsorption and positron annihilation methods. Positron lifetime measurements indicate the existence of ultramicropores and also larger mesopores in the SNW materials. The sizes of micropores and mesopores are almost the same in these samples, which are about 0.7 and 16.5 nm, respectively. The relative number of micropores increases in the order of SNW-1 < SNW-2 < SNW-3, while the number of mesopores increases in the reverse order. N2 adsorption/desorption measurements also reveal micropores and mesopores in these materials. However, it gives an underestimation of the micropore volume. Benefiting from the abundant nitrogen content and high microporosity, the SNW materials exhibit exceptionally high CO2 capture ability, which reaches a maximum value of 18.3 wt % in SNW-3 at 273 K and 1 bar, followed by SNW-2 and SNW-1. This order is exactly the same as the order of micropore volume revealed by positron annihilation measurement, suggesting that micropores play a crucial role in the CO2 uptake. Our results show that positron can provide more precise information about the structure of micropores and thus can offer an accurate prediction for the adsorption capacity of complex porous materials.
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DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2014
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IF 2.571
Abdul-Rauf Ibrahim,Lihua Zhu,Jing Xu,Yanzhen Hong,Yuzhong Su,Hongtao Wang,Binghui Chen,Jun Li
A CO 2 expanded carbonation technique is proposed for direct synthesis of alumina powders that does not require structure directing substances or templates. Mesoporous amorphous flower-like alumina was synthesized at relatively low volume expansions (lower ethanol to water volume ratio), whereas mesoporous crystalline honey-comb-like alumina was synthesized at high volume expansions. The alumina powders exhibited high surface area and pore size with small crystallite sizes. The alumina structures were stable from 400 to 800 °C. Experimental tests showed that the alumina powders could catalytically convert cyclohexanone to ɛ-caprolactone efficiently. The use of the calcined catalysts (at 400 and 800 °C; flower-like alumina) at equal ethanol to water volume ratio avoids the usual and inevitable hydrolysis of ɛ-caprolactone to ɛ-hydroxyhexanoic acid. The catalyst was recyclable and stable for up to five reaction cycles.
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DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Song Xiao,Menglei Jin,Junyi Chen,Peng Wu,Ju Tang,Yi Luo,Yi Li
Perfluoroisobutyronitrile (C 4 F 7 N) mixed with CO 2 has emerged as a promising eco-friendly alternative to sulfur hexafluoride (SF 6 ) in gas-insulated equipment (GIE). However, thermal or discharge faults in GIE inevitably lead to the generation of harmful decomposition by-products, necessitating their prompt removal to safeguard equipment operation and personnel safety. In this study, we propose a nanofiber composite material comprising polyacrylonitrile (PAN) as the base and multi-metal organic frameworks (MOFs) as the primary adsorbent material for removing typical decomposition components of C 4 F 7 N/CO 2 gas mixture. Utilizing grand canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations, we elucidate the selective adsorption mechanisms. Experimental results show that PAN@HKUST-1(Cu) exhibits superior adsorption efficiency for fluorocarbon gases compared to PAN@MIL-101(Cr), while the latter demonstrates better performance for nitrile gases. The PAN@HKUST-1(Cu)/MIL-101(Cr) composite adsorbent effectively removes eight typical harmful decomposition products while minimally affecting C 4 F 7 N. Our findings suggest that PAN@HKUST-1(Cu)/MIL-101(Cr) nanofiber film holds promise as an adsorbent for C 4 F 7 N/CO 2 based GIE.
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DOI
高影响因子
CARBON
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2019
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IF 7.466
Ruilong Cai,Bo You,Min Chen,Limin Wu
N-doped carbon/carbon heterojunction holds huge potential for efficient CO 2 capture. Here, a series of site-specific N-doped core-shell carbon spheres with carbon/carbon heterojunction were successfully prepared by carbonization of polypyrrole coated hypercrosslinked polystyrene spheres, followed by chemical activation with KOH. These activated carbon spheres possessed large specific surface area (2080 m 2 g −1 ) and abundant micropores (0.45 cm 3 g −1 ). Despite their low nitrogen content (0.96 wt%), the CO 2 adsorption capacities of activated samples reached 3.69 and 5.80 mmol g −1 measured at 298 and 273 K, respectively, under atmospheric pressure (1 bar). More significantly, the N-doped carbon/carbon heterojunction contributes to a stronger and denser CO 2 packing in this system.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Liju Bai,Shijian Lu,Qizheng Zhao,Linlin Chen,Yingjie Jiang,Chunxiao Jia,Siming Chen
Non-aqueous biphasic solvents, which combine the advantages of a non-aqueous absorbent and biphasic absorbent, have attracted increasing attention for CO 2 capture because of their great potential to reduce the energy consumption. This study proposed a non-aqueous N -ethylethanolamine (EMEA)/ N , N -diethylethanolamine (DEEA)-based liquid–liquid biphasic absorbent with p -xylene (PX) to replace 45–65 % of DEEA. The biphasic absorbent comprising 30 wt% EMEA + 5 wt% DEEA + 65 wt% PX (30E5D65P) had the best phase-change behaviour. In this absorbent, 98.8 % of the absorbed CO 2 was in the lower phase of the solvent, with a volume percentage of 35.1 %. This absorbent also showed the best CO 2 -desorption performance, with almost double the CO 2 -desorption amount and maximum CO 2 -desorption rate compared with those achieved using the 30 wt% EMEA + 70 wt% DEEA (30E70D) non-aqueous absorbent. The regeneration energy of 30E5D65P was 1.71 GJ∙t −1 CO 2 , which was reduced by 31 % and 55 % compared with that of the non-aqueous 30E70D absorbent and the aqueous 30 wt% monoethanolamine absorbent, respectively. 13 C NMR analysis and quantum chemical calculations showed that carbamate and PX have a better separation effect than that of EMEA and DEEA, owing to the presence of both polarity and hydrogen bonding. PX with low polarity was beneficial for the separation of carbamate. The carbamate interacted with (protonated) EMEA, (protonated) DEEA and carbamic acid through hydrogen bonds, resulting in the appearance of these components in the lower phase. The carbamate had no hydrogen bond self-aggregation, which may be the reason why there was no crystal precipitation.
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高影响因子
ACS Omega
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2022
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IF 4.132
Lisha Sheng,Zhenqian Chen,Xin Wang,Abdul Samad Farooq
Porous liquids (PLs) have both liquid fluidity and solid porosity, thereby offering a variety of applications, such as gas sorption and separation, homogeneous catalysis, energy storage, and so forth. In this research, canopies with varying structures were utilized to modify porous silica nanoparticles to develop Type I PLs. According to experimental results, the molecular weight of canopies should be high enough to maintain the porous materials in the liquid state at room temperature. Characterization results revealed that PL_1_M2070 and PL_1_AC1815 displayed low viscosity and good fluidity. Both low temperature and high pressure positively influenced CO2 capacity. The cavity occupancy resulted in poorer sorption capacity of PLs with branched canopies in comparison with that with linear canopies. Furthermore, the sorption capacity of PL_1_M2070 was 90.5% of the original CO2 sorption capacity after 10 sorption/desorption cycles, indicating excellent recyclability.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Min Zhang,Shipeng Zeng,Zhihong Du,Hailei Zhao
A new series of layered perovskite K 2 NiF 4 structure La 2 Ni 1-x Sb x O 4+δ (LNSx, x = 0, 0.025, 0.05) were used to prepare the LNSx-molten carbonate (MC) dual-phase membrane for CO 2 separation. Sb doping at the Ni site is expected to enhance CO 2 permeability and improve the resistance towards CO 2 /carbonate corrosion. In this work, the CO 2 permeability of the LNSx- MC membrane was investigated for CO 2 -containing atmospheres with and without oxygen, and correlated with the lattice characteristics, microstructure, chemical bond, and conductivity of LNSx support. The result shows that the introduction of Sb improves the structure symmetry and increases the interstitial oxygen concentration, which is beneficial for oxygen ion transport. The superior CO 2 permeability of Sb-doped sample is confirmed by the higher permeation fluxes with value of 0.15 mL min −1 cm −2 at 800 °C of LNS0.025-MC dual-phase membrane in 50% CO 2 + 50% N 2 . In addition, the LNS0.025-MC dual-phase membrane achieves a great enhancement in chemical and structural stability compared to the LNS0. In the simulated flue gas 15% CO 2 + 10% O 2 + 75% N 2 , the LNS0.05-based dual phase membrane shows a high permeation flux of 1.07 mL min −1 cm −2 at 800 °C, which is 2 times higher than that of LNS0-based dual-phase membrane.
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高影响因子
Gas Science and Engineering
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2023
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IF 0
Rui Zhang,Haonan Liu,Ruixi Liu,Yingjie Niu,Luning Yang,Francesco Barzagli,Chao'en Li,Min Xiao
The blending of primary amines, with fast reaction kinetic, together with tertiary amines, with a large loading capacity, is an increasingly popular approach to develop high-performance CO 2 capture sorbents with low energy requirements for regeneration. In this study, we investigated the CO 2 absorption performance of several aqueous solutions obtained by mixing ethanolamine (MEA) and diethylethanolamine (DEEA) and compared them with that of individual MEA and DEEA. CO 2 loadings at equilibrium were measured experimentally under a wide range of operating conditions, at temperatures between 298 and 323 K, CO 2 partial pressures in the range 5–60 kPa, and different amine mixing ratios. In addition, 13 C NMR spectroscopy was employed to elucidate the reaction mechanisms and identify the species formed during CO 2 capture. The results of the study reveal the intricate interplay of MEA and DEEA in CO 2 capture, where MEA carbamate formation predominates in the early stages, gradually shifting to bicarbonate formation as the amine concentration decreases. Moreover, excess properties, which reflect non-ideal behaviors in amine blends, were introduced as a key parameter in the study. An excess property model, based on excess CO 2 loading, was developed to accurately predict the CO 2 equilibrium solubility without constant experimental measurement. As a result, good agreement was found between the experimental data and those calculated with the model (excess CO 2 loading) under the same operating conditions, with a average relative deviation of 1.1%.
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DOI
Applied Materials Today
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2022
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IF 8.663
Weibin Zhang,Touwen Fan,Zhen Yang,Ruipeng Yu,Xinjuan Zeng,Yonghang Xu,Min Zhang,Huawen Hu,Jian Zhen Ou,Lirong Zheng
While the relatively complex chemical composition of Prussian blue analogues (PBAs) allows a high degree of flexibility in tuning the catalytic performances toward CO 2 -based copolymerization , little is known regarding the influence of the crystal phase. Herein, we investigate the impact of the crystal phase tuning of the representative Zn−Co-based PBA on CO 2 −epoxide copolymerization. The utilization of oxygen-containing tert ‑butanol molecules ( t BuOH) replaces water molecules from the Zn active center within the PBA-based nanosheets, inducing the crystal transformation from conventionally cubic to rhombohedral. The rhombohedral phase can be formed as clusters dispersed within the amorphous matrix, exhibiting the most active and selective CO 2 −epoxide copolymerization performance with a turnover number of 31,250 g/g Zn compared to that of long-range ordered cubic and rhombohedral counterparts. Such an improvement is ascribed to the abundant exposed Zn-O active centers enabled by the replacement of t BuOH molecules and rhombohedral coordination. Density functional theory calculation indicates different average adsorption energies for cyclohexene oxide (CHO) and CO 2 (-5.45 vs. -0.02 eV) on the (001) surface, implying the initialization of copolymerization from the adsorption of CHO onto the Zn-O active centers. This work provides a feasible approach to enable on-demand manipulation of catalytic performances of emerging PBAs.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Wenji Zheng,Ziheng Li,Tianqi Sun,Xuehua Ruan,Yan Dai,Xiangcun Li,Chuling Zhang,Gaohong He
Metal organic frameworks (MOFs) based mixed matrix membrane (MMM) for CO 2 capture shows insufficient CO 2 permeability due to random disperse of MOFs in form of individual particle. Therefore, in this work, a continuous MOFs transport pathway for CO 2 with low resistance was constructed in the MMM by assistance of electrospun nanofiber . Specifically, PAN electrospun nanofiber mat (NFM) was utilized as skeleton to obtain continuous ZIF-8 nanofibers. Then flexible polyethylene glycol (PEG) molecules were photo-polymerized in situ into the inner-voids within ZIF-8@PAN NFM to form dense membrane . As a result, ZIF-8 particles are distributed in PEO matrix continuously, leading to a low-resistance transport pathway for gas molecules in MMM, which is proved by the cross-sectional SEM images. Furthermore, the higher Tg of ZIF-8@PAN-x/PEO MMM by DSC also indicates the good interfacial compatibility between ZIF-8 and PEO. Compared with pure PEO membrane, all the ZIF-8@PAN-x/PEO MMMs present both enhanced CO 2 permeability and CO 2 /N 2 selectivity. The enhanced CO 2 permeability is attributed to the continuous ZIF-8 transport pathway, and the improved selectivity is ascribed to the size screening from nanofibers overlapping and stacking and the tortuous transport pathway. Importantly, compared with ZIF-8/PEO MMM, in which ZIF-8 particles are randomly dispersed into PEO matrix, the ZIF-8@PAN-4/PEO MMM with the same ZIF-8 loading of about 16.6 wt% presents enhanced CO 2 permeability and CO 2 /N 2 selectivity, which are increased by 52.4% and 44.3%, respectively. This is due to the continuous ZIF-8 transport pathway and good interfacial compatibility, which is also confirmed by the result of gas diffusivity and solubility coefficients. Together with the outstanding mechanical strength and stability, the proposed MMM with continuous ZIF-8 transport pathway paves a new way to improve CO 2 permeability.
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高影响因子
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