JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Mingcheng Li,Chunying Zhu,Taotao Fu,Youguang Ma
In this study, the densities and viscosities of the binary solutions 1-dimethylamino-2-propanol (1DMA2P) + H 2 O, benzylamine (BZA) + H 2 O, 1DMA2P + BZA and ternary solution 1DMA2P + BZA + H 2 O were measured at T = (298.15−333.15) K. Furthermore, the volumetric and the viscometric properties including the excess molar volume, partial molar volume, apparent molar volume, limiting apparent molar volume, viscosity deviation, excess Gibbs energy of activation for viscous fluid and Grunberg-Nissan interaction parameters were obtained in terms of experimental data, respectively. The excess molar volumes of binary and ternary solutions were fitted by the Redlich-Kister equation and Cibulka equation, besides, the viscosity and viscosity deviation of binary solution were correlated by using the Grunberg-Nissan equation and Redlich-Kister equation. Moreover, the intermolecular interactions were analyzed based on the volumetric and viscometric properties of solutions.
研究领域:
物理化学
·
热力学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shuyi Chen,Noor Khatoon,Chen Zhang,Qi Zhang,Shuhong Jiang,Honghai Yang,Jun Wang
Selective recovery of recyclables is a major challenge when treating textile wastewater. For this reason, there is an urgent need to develop nanofiltration membranes with high permeability and selective filtration. In response, a novel composite PVDF loose nanofiltration membrane was developed by combining two different mixed amines system/dopamine (DA) followed by interfacial polymerization with benzoyl chloride (TMC). The two different amines systems were a mixture of GAZ and PEI and a mixture of PIP and PEI, respectively. The effects of GAZ/PEI and PIP/PEI on the microstructure was characterized by SEM, AFM, FTIR and XPS and performance of the membrane was also investigated. The effects of GAZ/PEI and PIP/PEI on the microstructure and the selective layer of membranes were different. The results stated that with the increase of GAZ/PEI the thickness of the selective layer, surface roughness decreased, while the fluxes of pure water and dye wastewater increased. However, with increasing PIP/PEI, surface nodules and roughness both increased. Contrarily, the thickness of the selective layer and PEG800 rejection first decreased and then increased, while the flux of pure water and the dye wastewater first increased and then decreased. The optimal GAZ/PEI and PIP/PEI were 9/91 and 50/50, respectively. When the GAZ/PEI was 9/91, the pure water flux and the RB5 wastewater flux were 20.7 L∙(m 2 ∙h) −1 and 11.5 L∙(m 2 ∙h) −1 . The dye (RB5) retention rate was 94.3% and salt retention rate was 2.1%. However, when the PIP/PEI was 50/50, the pure water flux and RB5 wastewater flux were 26.6 L∙(m 2 ∙h) −1 and 17.1 L∙(m 2 ∙h) −1 increased by 87.3% and 134.2% respectively. The retention rates of RB5 and NaCl were 96.3% and 1.7%. The above results indicate that the composite PVDF LNF membranes prepared with mixed amine monomers instead of single amine monomers have good selective filtration performance.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
POLYHEDRON
·
2020
·
IF 2.343
Jian-Han Zhang,Zhi-Zhong Su,Ju-Xiang Luo,Yi Zhao,Hong-Gang Wang,Shao-Ming Ying
A mixed amines thiogermanate, namely (NH 4 ) 2 [NH 2 (CH 3 ) 2 ] 2 Ge 2 S 6 has been successfully synthesized by solvothermal reaction. Single crystal X-ray diffraction indicates the compound crystallizes in monoclinic space group P 2 1 / c with the lattice parameters: a = 6.9647(14) Å, b = 15.719(3) Å, c = 7.2042(14) Å, β = 92.76(3)°. The structure features a zero-dimensional [Ge 2 S 6 ] 4− anions which are separated by NH 4 + and [NH 2 (CH 3 ) 2 ] + . Hydrogen bond interactions play a crucial role in its structure formation. X-ray powder diffraction and TG-DSC measurements were performed to study its phase purity and thermal stability. UV–Vis diffuse reflectance spectroscopy coupled with Urbach fitting indicates an indirect optical transition semiconductor with a bandgap value of 3.50 eV. The result of first-principles electronic structure calculation supported the experimental indirect optical transition but the value was under estimated as 3.061 eV. Density of states and population analysis were also calculated to reveal the origin of the bandgap and bond interaction for its structure formation.
研究领域:
材料科学
·
晶体学
·
理论计算
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Haonan Liu,Francesco Barzagli,Li Luo,Xin Zhou,Jiaofei Geng,Chao’en Li,Min Xiao,Rui Zhang
The combination of primary and tertiary amines represents a promising approach to improve sorbent performance in CO 2 capture by enhancing absorption efficiency and reducing regeneration energy. This study focuses on investigating the absorption performance of binary mixtures of ethanolamine (MEA) and N,N-dimethylethanolamine (DMEA) at temperatures between 298–323 K and CO 2 partial pressures between 5–60 kPa. The species generated during the absorption were analyzed using 13 C NMR spectroscopy, to clarify the intricate role of MEA and DMEA in the capture process. A developed excess property model for MEA-DMEA, based on excess CO 2 loading, predicted equilibrium CO 2 solubility data with an average absolute relative deviation (AARD) of 1.6 %. Additionally, the machine learning models XGBoost, RBFNN, and SVR were applied, providing AARD values between 0.86 % and 1.28 %, demonstrating strong agreement between experimental and predicted outcomes. These comprehensive findings enhance our understanding of mixed amines’ mechanisms and practical applications, contributing to ongoing research development.
研究领域:
化学工程
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环境科学
·
机器学习
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Mengjie Chen,Qinlan Luo,Haizhou Lin,Qiang Sun,Hongxia Gao,Sen Liu,Yuanyuan Li,Zhiwu Liang
The kinetic behavior of the reaction of CO 2 with MEA-TREA in ethanol solution was studied using the stopped-flow technique. The results indicate that the zwitterion mechanism successfully correlates the experimentally measured pseudo first-order reaction constant ( k 0 ) and that the TREA participated in the deprotonation step of MEA-zwitterion as an alkaline substance after the formation of MEA-zwitterion. Then, the applicability of this proposed mechanism was investigated by using the reaction kinetics of CO 2 with MEA-DMEA, MEA-DEEA, MEA-MDEA, DEA-TREA, DEA-DMEA blended amines in non-aqueous ethanol solution, as well as MEA-TREA, MEA-DMEA, DEA-TREA, DEA-DMEA blended amines in water-lean solutions. It was found that the mechanism of the reaction of CO 2 with these mixed amines can be expressed by: k 0 = K A - A z [ A ] 2 + K A - B z [ A ] [ B ] + K 1 z [ A ] . The ethanol and water molecules which contribute to K 1 z can be used as proton transfer channels to accelerate proton transfer, but they do not directly participate in the reaction. In addition, the alkalinity and the steric hindrance effect controlled by the molecular structure of tertiary amines affected the reaction rate at the same time. The activation energies in MEA-EtOH and MEA-TREA-EtOH system were estimated by fitting the second-order rate constants to the Arrhenius expression, indicating that TREA can reduce the reaction activation energy and make the reaction more kinetically favorable.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Daofan Ma,Chunying Zhu,Taotao Fu,Xigang Yuan,Youguang Ma
The gas-liquid two-phase flow and the mass transfer characteristics for CO 2 absorption into the binary amine mixture of monoethanolamine (MEA) and N,N-diethylethanolamine (DEEA) aqueous solution were investigated in T-junction microchannel reactor with a square cross-section. The effects of gas-liquid flow rate and absorbent concentration on bubble length, velocity and mass transfer coefficient were studied. Three flow regimes including slug-bubbly flow, slug flow and slug-annular flow were observed under experimental condition, and the gas-liquid two-phase flow pattern map was depicted. It is found that the transitions between three flow regimes depend primarily on the competition of forces exerted on bubble in the T-junction. The kinetics of CO 2 absorption into blended amine aqueous solutions was analyzed to understand the mass transfer enhancement mechanism of new hybrid solvent. Furthermore, the liquid-side overall mass transfer coefficient k L and the liquid-side overall volumetric mass transfer coefficient k L a were determined through processing experimental images recorded by a high-speed camera. The results show that k L a is in the range of (3.04–20.07) s −1 in this work, which is 2–3 orders of magnitude higher than that in the conventional equipment. The dimensionless Damköhler number ( Da ) and Peclet number ( Pe ) are introduced to correlate the liquid-side volumetric mass transfer coefficient, new correlation shows good prediction accuracy with the average deviation of 3.64%.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
Minerals
·
2025
·Vol. 15
·期 5
·506
·
IF 2.2
Xiaoyu Li,Jie Chen,Wenqing Zhang,Chenyu Wang,Hui Ma,Kang Peng,Zheng Zhou
The urgent need for efficient CO2capture technologies has driven research into amine-functionalized adsorbents, though existing methods face trade-offs between adsorption capacity and cycling stability. This study addresses these limitations by developing a novel hybrid modification strategy combining chemical grafting and physical impregnation on polymorphic kaolinite minerals. Through systematic acid leaching and hybrid grafting–impregnation amine functionalization, the adsorbents with hierarchically porous structures and optimized performances are synthesized. The tubular adsorbent (ATK-APTES-PEI) demonstrated exceptional performance, achieving a CO2uptake of 1.68 mmol/g at 75 °C under a 60% CO2/40% N2mixed gas flow, with only 5.3% capacity loss after 10 adsorption–desorption cycles, significantly outperforming both rod-like (ARK-APTES-PEI, 1.55 mmol/g) and flake-like (AFK-APTES-PEI, 1.23 mmol/g) variants. The unique pore structure of ATK-APTES-PEI enables simultaneous high amine loading and maintained gas diffusion pathways, while the hybrid modification strategy synergistically enhances both adsorption capacity and stability by increasing active surface sites. These findings establish critical structure–property relationships for mineral-based adsorbents and demonstrate a scalable approach for industrial CO2capture applications. The work provides a blueprint for designing cost-effective, stable adsorbents using abundant clay minerals, bridging materials science with environmental engineering for sustainable carbon management solutions.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaoyu Li,Xueqi Zhao,Yao Meng,Haiyang Xue,Jie Chen,Kang Peng
Blending two amines has recently been developed as an efficient strategy to improve the post-combustion CO 2 capture performance of amine-functionalized mesoporous materials. The mixed two amine species of polyethyleneimine (PEI) and diethanolamine (DEA) can help to overcome the problems of intrinsic large viscosity, easy aggregation and low amine efficiency of the polyamine. In this study, a novel additive promoted supported mixed amines on mesoporous silica were successfully synthesized via a facile and efficient wet impregnation route. The adsorption performance of PEI and DEA individually loaded onto Al-MCM-41 was tested at 75 °C in a flow of 60 vol% CO 2 /40 vol% N 2 , leading to the identification of an optimal mixed amine loading of 50 %. The supported mixed amines system was further evaluated based on amine efficiency, adsorption capacity, kinetics and stability. The optimal adsorbent loaded with 30 wt% PEI and 20 wt% DEA exhibits a maximum CO 2 uptake of 3.53 mmol/g at 75 °C and stable cyclic stability with an average 1.93 % decay per cycle, due to the synergistic effect of both amines. The DEA with hydroxyl groups was introduced into PEI and co-impregnated within mesoporous silica can overcome the poor mass transfer of PEI, the limited stability of DEA and low adsorption capacity of Al-MCM-41. The synergistic combination of PEI and DEA is able to provide abundant CO 2 affinity sites and create extra CO 2 transfer pathways for effectively reducing the internal CO 2 diffusion resistance, by which the diffusion limitation of CO 2 in the deeper PEI films can be alleviated due to the interactions between PEI and DEA. As a result, the final mixed amine-functionalized adsorbents have excellent cyclic CO 2 uptake capacity, rapid kinetics and stability. This approach holds significant promise for environmentally friendly, cost-efficient, and large-scale applications in CO 2 capture and separation.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Yunlong Zhu,Hongyuan Xi,Song Zhou,Majed Shreka,Yifeng Wu,Jinquan Lin,Wenming Yang
High desorption energy consumption and low cyclic loading are critical issues limiting the application of onboard carbon capture (OCC) systems. In this study, a tetraethylenepentamine (TEPA) and 2–amino–2–methyl–1–propanol (AMP) mixed amine solvent with low desorption energy consumption and high CO 2 cyclic loading, suitable for the operational environment of OCC systems, has been proposed. Detailed research was conducted on the capture performance and mechanism of the TEPA + AMP mixed amine solvent. The 0.25M TEPA+0.75M AMP mixed amine solvent exhibited the best performance, with an 86.5% increase in CO 2 loading, a 214% increase in single–cycle CO 2 loading, a 236% increase in CO 2 loading after four cycles compared to monoethanolamine (MEA), and a 20.76% reduction in desorption energy consumption. In addition, to address the challenge of applying polyamine mixed solutions in the simulation studies of OCC systems, the capture mechanism was analyzed using density functional theory (DFT) calculations and nuclear magnetic resonance (NMR) characterization. The results indicated that increasing AMP promoted HCO 3 − formation in the TEPA + AMP mixed amine solvent. Since HCO 3 − decomposed more easily than carbamate, it reduced desorption energy consumption. However, an excess of AMP inhibited the absorption rate of TEPA, affecting the absorption capacity. Increasing the concentration of TEPA enhanced the amine concentration in the absorbent and improved the absorption performance. Nevertheless, excessive TEPA caused AMP to participate only in deprotonation reactions, which was not conducive to reducing desorption energy consumption.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
APPLIED ENERGY
·
2018
·
IF 7.9
Xiaowen Zhang,Rui Zhang,Helei Liu,Hongxia Gao,Zhiwu Liang
To enhance the energy efficiency of the CO 2 desorption process, the regeneration behaviors of the CO 2 -loaded 6 M MEA-AMP-PZ (monoethanolamine, 2-amino-2-methyl-1-propanol and piperazine) tri-solvent blends with different AMP/PZ molar ratios with four different solid acid catalysts (H-ZSM-5, γ-Al 2 O 3 , SAPO-34 and SO 4 2− /TiO 2 ) and a blank at 96 °C were investigated in terms of CO 2 desorption rate, cyclic capacity and relative heat duty. For the no-catalytic runs, the results showed that all the tri-solvent blended amines greatly increased CO 2 desorption rate, cyclic capacity and decreased the relative heat duty in comparison with 5 M MEA. The 13 C NMR analysis indicated that the 3 M MEA-2.5 M AMP-0.5 M PZ blend with the highest AMP/PZ ratio produced the largest amount of bicarbonate and less carbamate, which resulted in the best desorption performance. With regard to catalyst, when the solid acid catalysts were introduced, the regeneration performance of the blend was further improved. The best of the blends along with H-ZSM-5 provided the combination with the best performance in CO 2 desorption, and reduced the relative heat duty by 61.6% as compared to 5 M MEA without catalyst (100%). Five relevant physicochemical properties of the catalyst were obtained and used to better understand the catalytic regeneration process. A possible catalytic CO 2 desorption mechanism was analyzed. The results revealed that the mesopore surface area coupled with total acid sites of the catalyst had the most positive influence on improving the CO 2 desorption performance. Findings from this work imply that the combination of solid acid catalyst with tri-solvent blended amines is a promising alternative method for further reduction of solvent regeneration energy requirement.
研究领域:
化学工程
·
环境科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yijiao Qiu,Houfang Lu,Yingming Zhu,Yingying Liu,Kejing Wu,Bin Liang
Phase-change solvents exhibit the promising potential to reduce the regeneration energy for CO2 capture. In this paper, 3-dimethylaminopropylamine (DMAPA) with intramolecular primary and tertiary amino groups was mixed with solvent NHD and water for phase-change absorption of CO2 in the model flue gas. The results show that the homogeneous mixture changes into two phases after CO2 absorption when NHD/H2O ranges from 9:1 to 5:5 and 90% of CO2 is enriched in the lower phase with only 23% of the total volume. The absorption loading reaches 1.06 mol CO2/mol amine, the phase separation time for DMAPA–NHD–H2O is only 14% of that for MEA–SA–H2O, and the viscosity of the lower phase is only 37.14 mPa·s when DMAPA and NHD/H2O are 1 M and 8:2, respectively. Analysis of the reaction mechanism shows that the primary amino group of DMAPA initially reacts with CO2 and the tertiary amino group captures proton of zwitterionic intermediate as an acceptor. The mixed-amine effect is suggested to explain the high absorption performance of the DMAPA–NHD–H2O mixture. The energy estimation shows that the regeneration energy is reduced by 42% compared with that of the 5 M MEA solution, which confirms the advantage of phase-change absorption using DMAPA–NHD–H2O.
研究领域:
化学工程
·
环境科学
·
能源技术
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产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 46
·19474-19483
·
IF 7.79
Weishuo Xing,Shuang Zhang,Ruoting An,Wengang Bi,Chong Geng,Shu Xu
Tetrapod CdSe/CdS quantum dots (QDs) have attracted extensive research interest in light-emitting applications due to their anisotropic optical properties and large absorption cross-section. Traditional synthesis methods for tetrapod CdSe/CdS QDs usually employ fatty phosphonic acid ligands to induce the growth of wurtzite CdS arms on cubic CdSe QDs at high temperatures (350–380 °C). Here, a low temperature (120 °C) route was developed for the synthesis of tetrapod CdSe/CdS QDs using mixed amine ligands instead of phosphonic acid ligands. A study of the growth mechanism reveals that the amine ligands induce the orientation growth of cubic CdS arms on wurtzite CdSe QDs through a pyramid-shaped intermediate structure. The low reaction temperature facilitates the growth control of the tetrapod CdSe/CdS QDs through a microfluidic reactor. This study substantially simplifies the synthetic chemistry for the anisotropic growth of CdS on CdSe QDs, paving the way for green and economic production of tetrapod CdSe/CdS QDs towards efficient light-emitting applications.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）