JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Guangming Yan,Haoran Lu,Shushan Yuan,Xiao Deng,Junyong Zhu,Gang Zhang
In this study, a new category of copolymer was designed by side grafting of tertiary amines (TA) on polyaryl ether sulfone. The synthesized copolymers PES/ATA displayed superior thermal properties with a glass transition temperature of 200–225 °C. These copolymers with favorable film-forming properties were used to fabricate ultrafiltration membranes via a phase inversion approach. Surprisingly, it was found that the filtration performance of these resultant membranes could be reversibly tuned between a facile acid oxidation (CH 3 COOH:H 2 SO 4 :H 2 O 2 = 40:1:1) and alkali solution (solution of 20 wt% NaOH, immersed for 4–8 h) treatment. While the water flux of dye solution had a twofold reduction, the oxidized membranes showed distinctly enhancement of methylene blue rejection from 35% to 91.5% after oxidation treatment. Subsequently, alkali treatment of the oxidized membranes allowed their water flux to recover up to 89% as that of pristine membranes, and the methylene blue rejection can recover to almost the same as that of pristine membranes. This phenomenon was closely related to the introduced reactive TA units: the TA group in the polymeric membrane was converted into stimulus-responsive amine oxide (AO) unit, then its charge can be reversibly changed between the acid oxidation and alkali treatment, and that can be used to tune the electrostatic repulsion and further tuned the membrane pore size. In addition, compared with the polyarylene sulfone membrane, the mechanical properties of these membrane had almost no deterioration after several treatment cycle. This study supplies a novel and facile routine to fabricate functional membranes with reversible-tunable filtration properties.
研究领域:
材料科学
·
膜分离技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yanan Yu,Yao Shen,Xiaowei Zhou,Fan Liu,Shihan Zhang,Shijian Lu,Jiexu Ye,Sujing Li,Jianmeng Chen,Wei Li
Biphasic solvent has been widely studied for CO 2 capture due to its excellent energy-saving potentiality. However, its complex composition makes the prediction of main performances, like phase separation behavior or absorption rate, become obscure and difficult. This work investigated the relationship between the physical properties of tertiary amines and proton transfer process, phase separation behavior and absorption rate of biphasic solvents via quantum calculation and experimental results. The high electronegativity of tertiary amine N atom makes the biphasic solvent exhibit the fast phase separation rate and absorption rate, and maximum phase separation rate can reach 0.056 min −1 . Furthermore, the increase of N atom polarity can delay the appearance of phase separation peak and stabilize the absorption rate during the counter-current absorption process. We believe that the relationship revealed by this work can deepen the understanding for screening and practical applying of biphasic solvents.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 138
·期 15
·50201
·
IF 2.52
Ao Ding,Jinyue Zhou,Xiangze Cheng,Chunhui Shen,Shanjun Gao
A series of tertiary amine and siloxane crosslinked composite anion exchange membranes were prepared by incorporating 2-(3,4-epoxycyclohexyl) ethyltrimethoxysilane (EHTMS) and N , N , N ′, N ′-Tetramethyl-1,6-hexanediamine (TMHDA) into N -Methyldiethanolamine (MDEA)-functionalized poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) backbone via sol-gel process. The resultant membranes named as AEM-X (X = 1, 2, 3, 4), which own a three-dimensional (3D) cross-linking structure, exhibit superior swelling resistance, mechanical properties, even the thermal stability is up to 220°C. Compared with AEM-1 (contains no crosslinker), the swelling ratio of AEM-2 obviously decreases by 10.2% at 80°C, while the OH − conductivity of AEM-2 has a merely 1.9% decline (20.6 mS cm −1 ) at 80°C and can maintain 67% of its initial value in a 2 M aqueous NaOH at 80°C for 240 h. The simultaneous introduction of inorganic siloxane and organic linear crosslinker provides a new idea for the preparation of anion exchange membranes with largely improvement in dimensional stability and alkali resistance while the ionic conductivity is kept at comparatively high level.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2025
·
IF 6.3
Shuang Han,Yang Guo,Fubang Huang,Fei Wang,Weidong Zhang
Reversible complexation mediated polymerization (RCMP) is one of the most robust reversible deactivation radical polymerization (RDRP) systems. However, oxygen sensitivity hinders its practical applications in conventional RCMP. In this study, the fully oxygen-tolerant RCMP is successfully carried out under visible light irradiation using alkyl iodides as initiators and tertiary amines (TAs) as catalysts. This open-to-air RCMP requires neither additives nor prior deoxygenation. Furthermore, the polymerization exhibited first-order kinetics, and molecular weight increased linearly with monomer conversion, demonstrating “living” characteristics under open condition. We believe this minimalist method can offer new opportunities for the application of RCMP in an aerobic environment.
研究领域:
高分子化学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2022
·
IF 4.654
Meisi Chen,Mengjia Li,Feng Zhang,Xingbang Hu,Youting Wu
With the catalytic induction of ethylene glycol (EG), anhydrous N,N-dimethylethanolamine (DMEA) shows CO2 absorption performance via chemical binding and physical storage under normal pressure. Among the absorbents, pure DMEA and EG can hardly absorb CO2 directly, but when the zwitterionic alkylcarbonates are formed between CO2 and DMEA-EG, which can be characterized by 13C NMR and FTIR spectroscopy, the absorption rate of CO2 is improved. With the increase in the CO2 loading as the mass fraction of EG in DMEA–EG, 80 wt % EG captures up to 0.72 mol/mol at 293 K and 101 kPa via chemical binding and physical storage. The amount that is chemically bound and physically stored is directly dependent on temperature; within the range of 293–323 K, an absorption–regeneration cycle can be formed in a closed vessel because the zwitterion DMEA–EG–CO2 is unstable at higher temperatures. In other words, DMEA–EG–CO2 can be easily regenerated upon appropriate depressurization or heating. The corresponding thermodynamic calculations prove that the regenerative energy of DMEA–EG–CO2 is −27.33 kJ/mol, far less than that of other absorbent systems.
研究领域:
化学工程
·
环境科学
·
物理化学
·
能源技术
·
气体分离
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF ORGANIC CHEMISTRY
·
2025
·Vol. 61
·期 5
·872-880
·
IF 0.9
Tong Mengnan
A versatile, convenient, mild, and efficient method for the synthesis of N-benzoyloxyamines containing alkenone or allyl ester groups, starting from hydroxylamine derivatives, is developed and successfully extended to a broader range of tertiary amine analogs.
研究领域:
有机化学
·
药物化学
·
合成化学
·
生物医学化学
·
分子设计
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Zilin Zhao,Wangxi Fang,Youcai Chen,Shoujian Gao,Yuzhang Zhu,Jian Jin
Lignin, the second most abundant biomass resource, is widely utilized across various industries. Lye extraction is a prevalent approach for extracting lignin, but it needs to consume a lot of acid to neutralize the lye and precipitate the lignin products, resulting in a tremendous waste of acid and alkali. Direct separation of lignin and lye through nanofiltration technology can significantly reduce the consumption of acid and alkali. However, the development of nanofiltration membranes with sufficient alkali resistance for processing lignin and lye remains a challenge. Herein, we report the fabrication of polytertiary amine (PTA) nanofiltration membranes with exceptional alkali resistance via interfacial polymerization of piperazine and 1,3,5-tris-bromomethyl-benzene. PTA membranes maintained stable nanofiltration performance after immersion in alkaline solutions for 30 days and exhibited nearly unchanged lignin rejection even in NaOH solutions with concentrations of up to 5 mol L −1 . During the separation of lignin and lye, PTA membranes demonstrated high lignin rejection of 95 % and low NaOH rejection below 15 %, along with a high water permeance of 14 L m −2 h −1 bar −1 . Quantitative lignin/lye separation using the PTA membrane achieved 80 % recovery of the lye with a NaOH purity of 98.4 %, simultaneously concentrating the lignin sixfold. This work opens a new approach to developing durable nanofiltration membranes for sustainable lignin extraction and separation applications in alkaline environments.
研究领域:
膜科学
·
化学工程
·
材料科学
·
环境工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 129
·期 2
·846-852
·
IF 1.289
Hong Yu Yang,Xiu Mei Zhang,Li Jie Duan,Ming Yao Zhang,Guang Hui Gao,Hui Xuan Zhang
A series of environmental pH-responsive block copolymers PEG-polyurethane with tertiary amine groups in the main chain and free carboxyl groups in the side chain were synthesized, including poly(ethylene glycol) (PEG), 1,4-bis (hydroxyethyl) piperazine, 1,6-diisocyanato hexamethylene, and 2,2-dimethylolpropionic acid. The chemical structure, molecular weight, and pH-dependent capacity of pH-responsive PEG-polyurethane were examined by 1 H-NMR, FTIR, gel permeation chromatography (GPC), and an acid-base titration. Moreover, the fluorescent dye fluorescein isothiocyanate was conjugated with PEG-polyurethane by the similar polymerization method and the obtained polymer was measured by ultraviolet visible spectroscopy (UV-vis) and fluorescent spectroscopy. The results indicated that the pH-responsive PEG-polyurethane showed a pH-buffering phenomenon and fluorescent imaging in a range of pH values. As a result, we demonstrated its potential application for optical imaging; however, it is believed that more applications in the areas of biomedicine will be possible owing to its free carboxyl acid terminal residues in the stimuli-responsive polymer. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
生物材料
·
分子影像学
·
高分子化学
·
纳米医学
·
药物递送
·
生物传感器
·
转化医学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Kuan Huang,Jia-Yin Zhang,Xing-Bang Hu,You-Ting Wu
The development of ionic liquid-based absorbents for selective separation of H2S from CO2 is of interest to the natural gas industry. In this work, a series of tertiary-amine functionalized protic ionic liquids (TA-PILs) were synthesized by neutralizing one of the tertiary amine groups in diamine compounds with acetic acid, leaving the other tertiary amine group as the functional site for selective absorption of H2S. To overcome the high viscosity of pure ionic liquids, TA-PILs were dissolved in water to give mixed absorbents. The effects of TA-PIL species, TA-PIL concentration, and experimental temperature on the solubilities of H2S and CO2, and absorption kinetics of H2S and CO2 in aqueous TA-PILs were investigated systematically. The reaction equilibrium constants and absorption enthalpy of H2S and CO2 in aqueous TA-PILs were also calculated by correlating the solubility data with a reaction equilibrium thermodynamic model. Results demonstrated that aqueous TA-PILs have high absorption capacities for H2S. Although the equilibrium selectivities of H2S/CO2 in aqueous TA-PILs are minimized, they still display significant kinetic selectivities for the two gases. More importantly, the TA-PILs designed are featured with low cost and facile synthesis, making them more attractive than other functionalized ionic liquids reported in the literature for application in selective separation of H2S from CO2.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mengmeng Du,Baochang Sun,Yong Luo,Liangliang Zhang,Guangwen Chu,Haikui Zou,Jianfeng Chen
A novel tertiary amine-based CO 2 absorption process using zinc (II)-1,4,7,10-tetraazacyclododecane complexes (CN) as a catalyst in a rotating packed bed was proposed for energy-efficient CO 2 capture. The CN-catalysis reaction mechanism was first studied by density functional theory calculation, and the Gibbs Free Energy profile was established. Furthermore, the effects of various operation conditions for the tertiary amine-CN-CO 2 systems on the CO 2 removal efficiency ( η ), the overall gas-phase volumetric mass transfer coefficient ( K G a ), and the efficiency enhancement factor ( Φ ) were investigated. It was found that η and K G a with adding 4 wt% CN were 1–3 folds than those uncatalyzed. The absorption performance of CO 2 in DEEA solution with CN was superior to that in 10 wt% DEA solution. Finally, an artificial neural network model was established to predict K G a , and the predicted data agreed well with experimental results with the average absolute relative deviation of 5.07 %.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2017
·
IF 3.091
Hongxia Gao,Zeyang Wu,Helei Liu,Xiao Luo,Zhiwu Liang
The absorption/desorption performance of carbon dioxide (CO2) in aqueous 5 M monoethanolamine (MEA) solutions in the presence of various solution regeneration promoters was comprehensively investigated using a multiple rapid screening method. The promoters considered were N-methyldiethanolamine (MDEA), N,N-dimethylethanolamine (DMEA), N,N-diethylethanolamine (DEEA), 1-dimethylamino-2-propanol (1DMA2P), 1-diethylamino-2-propanol (1DEA2P), 3-dimethylamino-1-propanol (3DMA1P), 2-(dimethylamino)-2-methyl-1-propanol (2DMA2M1P), triethanolamine (TEA), 3-(dimethylamino)-1,2-propanediol (3DMA-1,2-PD), and 3-(diethylamino)-1,2-propanediol (3DEA-1,2-PD). The molar concentration of these promoters added into 5 M MEA was set to 1 mol/L. At the atmospheric pressure, the absorption and stripping experiments were carried out at 313.15 and 353.15 K, respectively. Especially, the CO2 partial pressure was controlled at constant 15 kPa for absorption experiments. In addition, the equilibrium solubility of CO2 was also determined in order to evaluate the driving force of each amine system. The results showed that the highest CO2 equilibrium solubility of 0.5548 mol CO2/mol amine was obtained by MEA/1DEA2P, whereas both the fastest absorption and regeneration rates were achieved for aqueous blended MEA/1DMA2P solution which made MEA/1DMA2P to exhibit the highest CO2 cyclic capacity of 1.6710 mol CO2/L.
研究领域:
化学工程
·
环境科学
·
能源技术
·
物理化学
✓ 已验证
DOI
高影响因子
International Journal of Greenhouse Gas Control
·
2025
·
IF 5.2
Guangjie Chen,Guangying Chen,Liuyi Yin,Fei Li,Li Sze Lai,Wee Horng Tay,Swee Pin Yeap,Lin Jin
Chemical-physical biphasic absorbents significantly reduce CO 2 capture energy consumption. In this study, four tertiary amines were combined with monoethanolamine (MEA) and sulfolane to form ternary MEA/co-absorbent/sulfolane biphasic solutions for CO 2 capture. The co-absorbents used were N-methyldiethanolamine (MDEA), 1-Dimethylamino-2-propanol (DMIPA), 3-(Dimethylamino)-1,2-propanediol (DMAP), and 3-Diethylamino-1,2-propanediol (DEAP). The dynamic phase separation behavior and properties were examined, the absorption/desorption characteristics were analyzed, and the phase separation absorption mechanism was explored through 13 C Nuclear Magnetic Resonance (NMR) Spectroscopy. Results showed that all four ternary solvents performed excellently, achieving high CO 2 loadings in the upper phases (3.09–3.41 mol/L), strong absorption and desorption efficiencies (over 92.5 % and 85 %, respectively), large cyclic loadings (above 2.67 mol/L), and reduced energy consumption (>45.81 % lower compared to 5 M MEA solution). The addition of tertiary amines improved the absorption performance of MEA/sulfolane solutions. Phase separation was influenced by amine solvent alkalinity and hydrophilicity, leading to the presence of sulfolane in both liquid phases and the selective distribution of MEA and tertiary amines. This research offers promising alternatives for efficient CO 2 capture and provides theoretical guidance on liquid-liquid phase separation absorption mechanisms.
研究领域:
化学工程
·
环境科学
·
物理化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）