COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Xun Fan,Guangcheng Zhang,Jiantong Li,Zhengyang Shang,Hongming Zhang,Qiang Gao,Jianbin Qin,Xuetao Shi
The functional multi-walled carbon nanotubes (fMWCNTs) and liquid carboxy-terminated butadiene-acrylonitrile copolymer (CTBN) were incorporated into epoxy (EP) resin to fabricate thermosetting composites, which were foamed using supercritical carbon dioxide (SCCO 2 ). The foamability, electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of foams were discussed. Owing to the heterogeneous nucleation caused by carbon nanotube, the average cell size of ∼400nm and cell density of ∼10 12 cells/cm −3 were obtained, resulting in the excellent foamability of EP-CTBN-fMWCNTs systems. The biaxial stretching during cell growing facilitates fMWCNTs to align, forming 2D conductive networks, and resulting in the improvement of electrical property. The composite foam with fMWCNTs content of 5.0 wt% possesses EMI SE of 22.90 dB and specific EMI SE of 37.54 dB/(g cm 3 ), which attributes to its high electrical conductivity of 0.43 S/m and cellular morphologies that made electromagnetic microwaves multi-reflect from one cell to another and then be attenuated by conductive filler.
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高影响因子
ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Guanying Dong,Jingjing Zhang,Zheng Wang,Jing Wang,Peixia Zhao,Xingzhong Cao,Yatao Zhang
Polydopamine-modified additives have been thus far widely used in the mixed matrix membranes (MMMs) for gas separation. However, very few reports focus on the polydopamine alone and investigate its contribution to the gas separation performance. Herein, the polydopamine-derived submicrospheres (PDASS) were paired with polymers of intrinsic microporosity (PIM-1) to fabricate high-performance gas separation membranes, through which the effects of PDASS on gas permeability and CO2/N2 separation performance were systematically investigated. The addition of PDASS provides a 1.6-fold enhancement in CO2/N2 selectivity together with acceptable gas permeability as compared to the original polymeric membrane. Such enhanced separation behavior is supposed to stem from the densified membrane microstructure induced by the strong intermolecular interactions between PIM-1 and PDASS (i.e., charge transfer, π–π stacking, and hydrogen bonding). Importantly, the physical aging behavior, as judged by gas permeability, is retarded for PIM/PDASS membranes after 4 months of testing.
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高影响因子
Journal of CO2 Utilization
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2018
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IF 5.503
Qiushi Huang,Guohua Jing,Xiaobin Zhou,Bihong Lv,Zuoming Zhou
Due to its great potential of energy consumption saving, the biphasic solvent has attracted more and more attention. In the present work, an efficient absorbent of amino-functionalized ionic liquids (AFILs) was dissolved in ethanol-water solvent to form a novel biphasic solvent for CO 2 capture. When the concentration of triethylenetetramine l -lysine ([TETAH][Lys]) was 0.5 mol/L and the volume ratio of ethanol-water solvent was 4:6, the [TETAH][Lys] solution separated into two phases after CO 2 absorption. Under the optimal conditions, the volume of the CO 2 -rich phase was about one third of the total volume of the mixture, which meant that only one third of the solution needed to be regenerated and the energy consumption could be greatly reduced. Meanwhile, the loading of the CO 2 -rich phase contributed about 93% of the total loading of the solution, and its viscosity was only 27.95 mPa s. The regeneration efficiency of the solvent after the 5th absorption-desorption cycle still kept at 91.3%. Based on the experimental and 13 C NMR analysis results, the reaction and phase change mechanisms of CO 2 capture into the [TETAH][Lys]-ethanol-water solution were clarified. CO 2 absorption into [TETAH][Lys] firstly formed carbamate, which would further hydrolyze to HCO 3 − /CO 3 2− and react with ethanol to form the ethyl carbonate. Due to the limited solubility of these absorption products in ethanol, as well as the good solubility in H 2 O, the products transferred to the lower phase while the ethanol stayed in the upper phase in the biphasic system.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Wenji Ruan,Menglin Wu,Yuanhua Xia,Jiupai Ni,Chengsheng Ni
This study aimed at improving electrocatalytic activity of solid oxide electrolysis cell (SOEC) cathode via in-situ exsolved nanoparticles. La 0.67 Sr 0.33 Fe 0.67 Ti 0.33 O 3-δ (LSFT) and La 0.67 Sr 0.33 Fe 0.6 Ni 0.067 Ti 0.33 O 3-δ (LSFNT-67) cathodes with a La/Sr ratio about 2.0 showed the exsolution of Fe 0 and FeNi 3 alloy nanoparticles, respectively, under a reducing atmosphere. The SOEC with LSFT of electrocatalysis is better than LSFNT-67 at 800 °C for direct electrolysis of CO 2 , the current density of LSFT and LSFNT-67 reach − 0.54 A cm −2 and − 0.29 A cm −2 , respectively, and the Faradaic efficiency is close to unity during the 25 h′ durability under a − 1.3 V bias. The better cell performance for the cell with LSFT than LSFNT-67 could be related to the larger distortion and the less amount of insulating LaSrGa 3 O 7 in the former, causing its unexpectedly larger quantity of metal exsolution and electron conduction for more active reaction sites for CO 2 activation. This work demonstrated that apart from thermodynamic consideration, steric effect of the B site cation could be important for the exsolution of metal particles from a perovskite with high La/Sr ratio and the resultant electrocatalysis of CO 2 electrolysis.
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高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2018
·Vol. 97
·期 3
·697-701
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IF 1.265
Wenting Si,Sha Ye,Dongxiao Zhang,Bin Yang,Yang Hou,Zhongjian Li,Xingwang Zhang,Jingke Zhu,Lecheng Lei
The kinetics and mechanism of low-concentration CO 2 adsorption on a solid-supported polyethylenimine (PEI) adsorbent in a humid confined space were investigated, where the content of CO 2 was about 0.4 % (v). A flow system, equipped with a dew point meter and IR gas analyzer connected in series for online measurement, was developed and the co-adsorption performance of CO 2 and H 2 O was analyzed. It was found that the H 2 O adsorption capacity and activation energy were not significantly changed when 0.4 % (v) CO 2 was applied in the co-adsorption process, indicating that the effect of dilute CO 2 could be neglected. However, the CO 2 adsorption capacity increased with the assistance of H 2 O, and then it decreased slightly when the H 2 O content in air flow was above 1.56 % (v). This implied that the adsorption activation energy of CO 2 could be significantly reduced due to the existence of H 2 O in air flow. The direct formation of bicarbonate on the supported PEI adsorbent was favoured for the co-adsorption process of CO 2 and H 2 O.
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高影响因子
CARBOHYDRATE POLYMERS
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2021
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IF 9.381
Hong Ma,Zhongguo Wang,Xiong-Fei Zhang,Meili Ding,Jianfeng Yao
Zeolitic imidazolate frameworks (ZIFs) hold great potential for carbon capture, while a major challenge for the practical application of ZIFs is the development of convenient three-dimensional bulk materials. Here, sustainable and biodegradable bacterial cellulose (BC) was used as the substrate for ZIF growth. Amino-functionalized ZIF-8 (ZIF-8-NH 2 ) was prepared within BC substrate via an in situ growth approach. ZIF crystals were wrapped uniformly over cellulose fibers and the chelating effect between metal (zinc) ions and hydroxyl groups makes the composites have high interface affinity and compatibility. The resulting foams presented a high CO 2 adsorption capacity of 1.63 mmol/g (25 °C, 1 bar). Moreover, ZIF-8-NH 2 @BC foams are facile to be regenerated by heating at 80 °C. This work provides a new avenue to construct ZIF/cellulose composites for gas treatment applications.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2018
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IF 6.14
Junhui Liu,Anfeng Zhang,Xiao Jiang,Min Liu,Yanwei Sun,Chunshan Song,Xinwen Guo
Conversion of CO2 to sustainable chemical feedstocks and fuels by reacting with renewable hydrogen is considered to be a promising direction in energy research. The selectivity of desired products, such as C2–C4= and C5+, is low over unpromoted iron-based catalysts for CO2 hydrogenation. Therefore, promoters are often used to tailor and optimize the product distribution. In this work, the effect of doping Cu into Fe-based supported catalysts on the catalytic performance for CO2 hydrogenation to hydrocarbons was studied with a particularly focus on the interaction between Fe and Cu. For this purpose, catalysts with different Fe and Cu distribution were prepared by various impregnation methods. It was found that the selectivity of C2–C4= over Cu-promoted catalysts decreased, but a significant improvement was obtained for C5+. This promoting behavior is different from that of other promoters (e.g., K, Mn, Zn, etc.). The secondary conversion of produced olefins on Cu-promoted catalysts, which results from the improvement of olefins adsorption, on Cu-promoted catalysts leads to the decrease of C2–C4= (hydrogenation) but the increase of C5+ (oligomerization). Characterization results demonstrate that the catalytic performance is evidently associated with the strength of the interaction between Fe and Cu in the supported catalysts.
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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
Guocan Shen,Yanbo Liu,Jiajie Ma,Ning Wu,Xionggang Lu,Hongwei Cheng
The application of CeO 2 -δ -molten carbonate (MC) dual-phase membranes is limited by low CO 2 permeation at high temperatures due to poor oxygen ionic conductivity. Ce 1- x Gd x O 2 -δ -MC ( x = 0.00–0.03) dual-phase membranes were designed to investigate the effects of Gd-doping on the ion transport capacity and CO 2 permeability. The introduction of Gd 3+ promotes the conversion of some Ce 4+ to Ce 3+ , initially increasing and then decreasing the Ce 3+ /Ce 4+ ratio. This process increases the oxygen vacancy content, with Ce 0.8 Gd 0.2 O 2- δ showing the highest concentration of oxygen vacancies. At 850 °C, the CO 2 permeation flux of the Ce 0.8 Gd 0.2 O 2- δ -MC membrane is more than twice higher than that of CeO 2- δ -MC, increasing from 0.17 to 0.58 mL min −1 cm −2 . Moreover, the microstructure of the Ce 0.8 Gd 0.2 O 2- δ support is regulated using pore formers of different particle sizes, increasing porosity from 24.3 % to 45.7 %. Consequently, the CO 2 permeation flux of the Ce 0.8 Gd 0.2 O 2- δ -MC dual-phase membrane rises from 0.29 to 0.75 mL min −1 cm −2 at 850 ℃ after optimizing the microstructure of the membrane. Furthermore, the long-term permeation test demonstrates excellent chemical stability of the dual-phase membrane. This study provides feasible modification strategies to enhance CO 2 separation.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Xiaolong Wu,Mingnv Guo,Ziqi Wang,Ruiming Fang,Jiang He,Zhongqing Yang
For the purpose of further improve the efficiency of photocatalytic CO 2 reduction and realize cascade utilization of the full solar spectrum, Bi 2 MoO 6 quantum dots were in situ deposited on the surface of carbonized pomelo peel (CPP) to form Bi 2 MoO 6 @CPP 0D/3D heterojunction catalyst. With a diameter of less than 10 nm, the quantum-limited field effects confirm the successful construction of Bi 2 MoO 6 quantum dot. The band structure of Bi 2 MoO 6 @CPP 0D/3D is beneficial heterojunction , which is able to utilize not only the UV–Vis band to generate photogenerated carriers that reduce CO 2 to CO mainly, but also the IR band of the solar spectrum to increase the temperature of photothermal catalytic reaction. The experiment indicated that the photogenerated electrons generated by Bi 2 MoO 6 @CPP 0D/3D heterojunction catalysts flowed through the interface C-O-Bi bridge and migrated to the surface of CPP, forming an electron interface. The interface C-O-Bi electron bridge enhanced the separation ability of photogenerated carriers, thereby increasing the CO yield to 50.77 μmol/(g·h). Further experiment showed that the oxygen-containing groups’ concentration of CPP were ameliorated by thermal activation and acid-base activation, which increased the concentration of interface C-O-Bi electron bridge between Bi 2 MoO 6 and CPP, finally promoting the CO yield to 66.94 μmol/(g·h), which is 12.3 times greater than that of bulk Bi 2 MoO 6 .
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yuchuan Feng,Jingwei Jia,Nana Wang,Suxia Ma
Hydration activation is an effective approach to improve the cyclic reactivity and mitigate the sintering of CaO sorbents. However, the interaction mechanism between sintering, hydration and reactivity remains unclear. In this study, we conducted hydration experiments using ex-situ water treatment in a separate hydrator to investigate the role of sintering degree in the activation reaction, complemented by ReaxFF molecular dynamics simulations (ReaxFF-MD) to elucidate the underlying mechanisms. The results revealed that high-temperature calcination causes apparent sintering of CaO, leading to a decline in CO 2 adsorption capacity. Hydration treatment greatly enriches the specific surface area and pore structure, providing more active sites and channels for CO 2 adsorption, thereby enhancing carbonation performance. The hydration degree of CaO was found to be negatively correlated with the degree of sintering, but positively correlated with the improvement of pore structure and property activation. Two types of hydroxyl groups (direct hydroxyl O w H and indirect hydroxyl O s H) were rapidly generated. O w H can convert to O s H through re-decomposition, involving O* radicals and proton diffusion. The hydroxylation gradually weakened as the sintering intensified. During the CaO hydration reaction, three types of water were generated: free H 2 O, adsorbed H 2 O and dissociated H 2 O. Free H 2 O and adsorbed H 2 O continued to increase with the degree of sintering, while the associated H 2 O decreased. Sintering significantly limited the diffusion of H atoms and hindered O s H formation, resulting in an overall decline in hydroxylation. For hydrated samples, the evaporation of free water, desorption of adsorbed water, and decomposition of dissociated water occurred simultaneously during heating. These phase transitions directly impacted on the evolution of pore structure.
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高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Guodong Xu,Junlian Wang,Fei Xu,Guoyong Huang,Shengming Xu,Bin Wu
It is imperative to recover the valuable components of spent HPCs. We have proposed a hydrometallurgical process and recovered 99.9% of V, 99.9% of Mo, and 95% of Al in our previous work. In this study, we focused on the Co and Ni recovery from the alkaline leaching residue of spent HPCs. We characterized the leaching residue by SEM-EDS, XPS, TGA, Laser Particle Size Analyzer, and ICP-OES. The Ni and Co leaching rates both reached around 95% with 2.0 mol/L H 2 SO 4 at 120 °C for 75 min. The impurity of Al in the leachate was removed via solvent extraction with 30% P204 at A/O of 1 and pH equilibrium of 2.0. The Co and Ni in the raffinate was separated via two stages of counter-current extraction with 20% Cyanex 272 at A/O of 1 and pH equilibrium of 5.7. The CoSO 4 and NiO products were characterized by XRD, and there are no impurity peaks. We also did DFT calculations, which show the binding energies of Al 3+ with extractants are in the order of Al 3+ -P204 > Al 3+ -P507 > Al 3+ -Cyanex 272, and Cyanex 272 exhibits the highest difference in binding energies of Ni 2+ and Co 2+ . The process of Ni and Co recovery from the alkaline leaching residue of spent HPCs was proposed. Only 8 t CO 2 and 120 kg SO 2 emissions were generated during all the component recovery per ton of the spent HPCs using our proposed process. They are much less than pyro-hydrometallurgical processes.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ying Xie,Zhixiang Xia,Chao Li,Man Mou,Ximing Hu,Wei Chen,Xiaoming Xu,Yang Xia,Zihao Liu,Mengxiang Fang
The steel industry contributes approximately 7–9 % of global anthropogenic CO 2 emissions. Chemical absorption is a promising strategy for reducing steel industry carbon emissions. MAA, a novel amine blend primarily composed of methyldiethanolamine (MDEA) and 2-(Piperazin-1-yl) ethanamine (AEP), exhibits potential but lacks industrial-scale validation. Focusing on the blast furnace (BF)-basic oxygen furnace steelmaking process, this study conducted pilot tests with MAA and 30 wt% MEA for BF gas (20 vol% CO 2 ) and top gas recycling-oxygen blast furnace (TGR-OBF) gas (35 vol% CO 2 ) and studied process modifications. The results showed that after 200 h of stable operation, MAA achieved optimal CO 2 capture from BF gas at a liquid-to-gas ratio of 8 L/Nm 3 , with a regeneration energy of 2.47 GJ/t CO 2 , compared to 3.78 GJ/t CO 2 for 30 wt% MEA. MAA achieved a regeneration energy of 1.81 GJ/t CO 2 for TGR-OBF gas, 26.72 % lower than that for BF gas. Absorber intercooling reduced regeneration energy by 8.86 %. Among the process modifications, directing 10 % of the rich solution to a flash evaporator for semi-lean solution recycling back to the middle of the absorber, with the remaining 90 % undergoing thermal regeneration in the stripper, demonstrated the lowest regeneration energy for TGR-OBF. This modification reduced MAA regeneration energy by 5.52 %. Additionally, two-stage water scrubbing effectively controlled amine emissions from the 10 Nm 3 /h pilot plant, reducing MAA emissions to 17.83 mg/Nm 3 after the second stage. MAA exhibited excellent adaptability to BF and TGR-OBF gases, achieving 90 % CO 2 removal efficiency with a minimum regeneration energy of 1.71 GJ/t CO 2 . The findings highlight the potential for the large-scale application of MAA in the steel industry to significantly reduce CO 2 emissions.
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高影响因子
危险品化学品经营许可证（带存储）