ENERGY & FUELS
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2017
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IF 3.091
Yue Zhao,Yangyang Bian,Hui Li,Hui Guo,Shufeng Shen,Jiangze Han,Dongfang Guo
Aqueous monoethanolamine (MEA) is widely used for CO2 capture and has been demonstrated as an effective absorbent in many postcombustion capture plants. However, several disadvantages such as toxicity, high volatility, solvent degradation, and high energy consumption were reported in the practical applications. Aqueous amino acid salts, particularly potassium lysinate (LysK), are considered as attractive alternatives to MEA. A comparative study of absorbent characteristics of aqueous LysK (2.0 M and 2.5 M) and aqueous MEA (5.0 M) was conducted in this study. The absorption and cyclic capacities, absorption and desorption rate, solubility of CO2, and heat of absorption were measured using a stirred batch-type reactor and a CPA201 reaction calorimeter under similar postcombustion capture conditions. Thermal and oxidative degradation was also evaluated for aqueous 2.0 M LysK at 383 and 423 K under static N2 and O2 exposure conditions for 15 days. Samples were analyzed by total alkalinity and 13C and 1H NMR spectra to provide insight into the degradation products. The advantages of the comparable CO2 capture performance, high stability, and low solvent loss compared to the state-of-the-art solvent MEA, suggest LysK can be a potentially advantageous absorbent for industrial CO2 capture processes.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
Nanoscale Research Letters
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2017
·Vol. 12
·期 1
·1-7
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IF 2.833
Zhang Bangwen,Wu Qian,Yu Huitao,Bulin Chaoke,Sun He,Li Ruihong,Ge Xin,Xing Ruiguang
As one of the simple and efficient routes to access two-dimensional materials, liquid exfoliation has received considerable interest in recent years. Here, we reported on high-efficient liquid exfoliation of hexagonal boron nitride nanosheets (BNNSs) using monoethanolamine (MEA) aqueous solution. The resulting BNNSs were evaluated in terms of the yield and structure characterizations. The results show that the MEA solution can exfoliate BNNSs more efficiently than the currently known solvents and a high yield up to 42% is obtained by ultrasonic exfoliation in MEA-30 wt% H 2 O solution. Finally, the BNNS-filled epoxy resin with enhanced performance was demonstrated.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
Advanced Optical Materials
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2024
·Vol. 12
·期 21
·2400673
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IF 8
Hong Jia,Zihao Chen,Yiping Chen,Xilin Wang,Jie Wei
In this study, a multi-monomer organohydrogel network is fabricated based on radical polymerization. Acrylic acid (AA) and dimethylaminoethyl methacrylate (DMAEMA) are used as hydrophilic monomers, and methoxyethyl acrylate (MEA) serves as a hydrophobic monomer. To endow the organohydrogel with a photo-responsive property, a fluorescent monomer, 1′-acryloyl chloride-3′,3′-dimethyl-6-nitrospiropyran (SPMA) is added. Under ultraviolet (UV) and visible light irradiation, SPMA undergoes ring-opening and ring-closing isomerization reactions, respectively. This leads to enhanced and reduced fluorescence. This fluorescence tunability allows for the local regulation of fluorescence in the organohydrogel using a photomask. By employing UV and visible light, complex information can be repeatedly written and erased on the organohydrogel. Additionally, based on the interactions between dimethyl sulfoxide (DMSO) and water within the system, the organohydrogel exhibits excellent anti-freezing and water-holding properties, allowing its use in low-temperature environments and extended preservation time. The organohydrogel has precise information writing capabilities and is more difficult to falsify as an information encryption platform. This study provides guidance for future researchers to develop information writing capabilities with higher precision and broader applications in various environments using smart materials.
研究领域:
材料科学
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化学工程
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生物医学工程
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DOI
高影响因子
Nanomaterials
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2021
·Vol. 11
·期 11
·3098
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IF 5.076
Boyu Zhang,Sixiang Zhao,Yingying Yu,Ming Li,Liancheng Zhao,Liming Gao
Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10−6A and 1.77 × 10−6A respectively and the anisotropy factor Δgpcof 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.Keywords:circularly polarization light detection;cellulose nanocrystal;ZnO photoconduction
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Nan Wang,Zhengqi Peng,Hongxia Gao,Teerawat Sema,Jialong Shi,Zhiwu Liang
Effective phase-change solvent system, n-methyl-2-hydroxyethylamine (MAE) + water-insoluble alcohol + H 2 O, was developed for CO 2 capture. First, a preliminary screening of several alcohols was carried out and showed that the MAE/n-butanol/water system had the potential to become an excellent phase change absorbent. Then, through phase change experiment, absorption experiment, desorption experiment, and theoretical energy consumption analysis, the MAE:n-butanol:water ratio of 3:4:3 possessed the most impressive CO 2 capture performance. Theoretical calculation of CO 2 desorption energy consumption showed that in comparison with 30 wt% monoethanolamine (MEA), 50% of reboiler heat duty can be reduced in case of the 3:4:3 system. In addition, equilibrium phase diagram of the three components showed that concentration of n-butanol significantly affected the phase separation. The two-phase species distribution after phase separation was determined using Nuclear magnetic resonance spectroscopy (NMR). This work also shows that temperature has influence on absorption and desorption performance. Finally, the absorbent stability test during absorption–desorption process confirmed that MAE/n-butanol/water absorbent had a great potential for capturing CO 2 .
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ENERGY & FUELS
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2020
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IF 3.421
Qinglin Li,Hairong Zhang,Fen Peng,Can Wang,Hailong Li,Lian Xiong,Haijun Guo,Xinde Chen
Biogas upgrading technology is important for increasing the heating value of biogas through selective adsorption of CO2. In this work, a series of new monoethanolamine (MEA)-modified attapulgite (ATP)-based amorphous silica (a-SiO2) sorbents with a large surface area and oxygen vacancies were prepared by the impregnation method for the selective adsorption of CO2 from simulated biogas. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N2 adsorption–desorption results indicated that MEA with suitable loading was anchored onto the external surface of a-SiO2, which could improve the dispersion of rodlike fibers of ATP. MEA loading and reaction temperature optimization experiments showed that the 50MEA/a-SiO2 sorbent achieved the highest CO2 adsorption capacity of 2.14 mmol/g with an amine efficiency of 5.22 mmol/g and 0.32 mol/mol at 60 °C. Furthermore, only a 6.3 and 4.7% reduction of CO2 adsorption capacity occurred after five adsorption–desorption cycles under simulated biogas at 30 and 60 °C adsorption, respectively, indicating that the sorbent has good regenerability and thermal stability. The chemical adsorption was proved to be the CO2 adsorption mechanism of MEA-modified ATP-based a-SiO2 sorbent by XRD and FTIR testing.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2018
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IF 2.631
Hui Guo,Li Hui,Shufeng Shen
Non-aqueous amine-based absorbents are considered as a potential application for CO 2 removal from biogas to reduce energy consumption, due to lower heat capacity and evaporation enthalpy of organics than conventional water solvent. In this work, monoethanolamine (MEA) + 2-methoxyethanol (EGME) mixtures were proposed as a novel CO 2 carrier. The density and viscosity of CO 2 -free and CO 2 -loaded MEA + EGME solutions were measured at temperatures of (293–353) K, for 10–100 mass % MEA. CO 2 solubility in 31.0 mass% (5.0 M) MEA solutions was investigated at temperatures from 313 K to 393 K and CO 2 partial pressures up to 260 kPa. The excess molar volumes and the ratio of viscosity η · η EGME −1 were correlated by Redlich-Kister equation and Weiland’s model, respectively. The vapour-liquid equilibrium data were correlated by using a semi-empirical model, i.e. CO 2 partial pressure as a function of temperature and CO 2 loading. The predicted values and the measured data matched well each other, with AAD within 0.2% for density, 4.5% for viscosity and 19.5% for CO 2 solubility respectively.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2019
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IF 3.372
Yangyang Bian,Hui Li,Shufeng Shen
Water-lean absorbents have potential applications for energy-efficient CO 2 capture. In this work, the chemical kinetics of the reaction between carbon dioxide (CO 2 ) and potassium prolinate (ProK) in ethanol, ethylene glycol and water solvents was measured in a stirred cell reactor with a stable gas-liquid interface at temperatures from 275.2 to 285.2 K and ProK molar concentrations up to 2.0 M. The experiments were performed under the pseudo-first-order regime to determine the overall kinetic rate constant ( k ov ) using two-film theory. The results showed that the reaction rates in each polar solvent increase considerably as the increasing ProK concentrations and temperatures. The reaction order was found to be in the range of 1.4–2.0 with respect to ProK concentration, depending on the solvents used. The kinetic results for the reaction in ethanol were also interpreted based on zwitterion mechanism and termolecular mechanism. The calculated from the two proposed models match well with the experimental data.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2022
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IF 3.898
Yihan Yin,Aoqian Qiu,Hongxia Gao,Yanqing Na,Zhiwu Liang
Phase change absorbents for CO 2 are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process. Compared with other phase change absorbents, monoethanolamine (MEA)-sulfolane-water is inexpensive and has a fast absorption rate. It is one of the most promising solvents for large-scale industrial applications. Therefore, this study investigates the mass transfer performance of this phase change system in the process of CO 2 absorption in a packed tower. By comparing the phase change absorbent and the ordinary absorbent, it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration. In the 4 mol⋅L −1 MEA/5 mol⋅L −1 sulfolane system, the CO 2 loading of the upper liquid phase after phase separation is almost zero, while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent, which greatly reduces the energy consumption. This study also investigates the influence of operating parameters such as lean CO 2 loading, gas and liquid flow rates, CO 2 partial pressure, and temperature on the volumetric mass transfer coefficient ( K G a V ). The research shows that K G a V increases with increasing liquid flow rate and decreases with the increase of lean CO 2 loading and CO 2 partial pressure, while the inert gas flow rate and temperature have little effect on K G a V . In addition, based on the principle of phase change absorption, a predictive equation for the K G a V of MEA-sulfolane in the packed tower was established. The K G a V obtained from the experiment is consistent with the model prediction, and the absolute average deviation (AAD) is 7.8%.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
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IF 3.573
Juan Lv,Sen Liu,Hao Ling,Hongxia Gao,Wilfred Olson,Qiang Li,Zain Ali Saleh Bairq,Zhiwu Liang
A new sulfolane/secondary amine biphasic absorbent, sulfolane/2-methylaminoethanol (MAE) solution, was developed for postcombustion CO2 capture (PCC). Surprisingly, using a 4M/5M sulfolane/MAE solution saves about 60% energy consumption (EC) for CO2 stripping when compared with traditional aqueous 5M monoethanolamine (MEA) solutions. First, we theoretically proved that MAE in sulfolane-based biphasic solution improves the CO2 absorption rate with high CO2 loading at the phase-changing point, which could be energy-saving for CO2 stripping. Based on a comprehensive comparison of the phase-changing behavior, nuclear magnetic resonance (NMR) spectra, absorption rate, and desorption performance, the 4M/5M sulfolane/MAE was determined to be the optimal molar ratio among six sulfolane/MAE biphasic solutions for CO2 capture. In addition, the absorption and desorption experiments with various temperatures revealed that relatively low temperature (ranging from 110 to 120 °C) was favorable for CO2 removal and energy-saving. Furthermore, the 4M/5M sulfolane/MAE solution achieved a very low energy consumption (EC) compared with that of 5M MEA solution, and the stripped CO2 amount is similar to that of 5M MEA and 5M MAE solutions.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Hui Li,Hui Guo,Shufeng Shen
Solvent regeneration for the conventional aqueous amine-based CO2 capture is very energy intensive. Development of phase-changing absorbents is an attractive solution for low energy consumption. In this work, a novel water-lean amino acid salt-based biphasic absorbent was proposed to improve CO2 capture performance and energy efficiency. Potassium prolinate (ProK) and potassium sarcosinate (SarK) with a secondary amino group were used as active components, and 2-alkoxyethanols with low volatility, low specific heat, and low viscosity were used as physical antisolvents and triggered the formation of solid phase during CO2 absorption. CO2 absorption and desorption characteristics in these systems and continuous capture cycles were investigated under ambient pressure. Relative regeneration energy consumption for solvent regeneration was also evaluated in comparison with the benchmark aqueous MEA. Phase change behavior and partition of CO2 absorbed in liquid and solid phases were characterized, and the product species in CO2-rich solid phase were identified by 13C NMR and XRD. Results demonstrated that using weak polar solvents, such as 2-methoxyethanol (EGME) and 2-ethoxyethanol (EGEE), can be favorable for the formation of solid precipitates in these systems investigated. Solid slurry with CO2 loading of 2.5–3.5 mol kg–1 can captured about 50–80% of the absorbed CO2. Ionic products such as bicarbonate and protonated amino acid salt were proved to be the main compositions in the solid precipitate. In comparison with aqueous 5.0 M MEA, the 3.0 M ProK/EGME system showed comparable cyclic capacity (about 0.80 mol kg–1) and a little higher desorption efficiency. Surprisingly, about 40–50% reduction of regeneration energy indicates that water-lean phase change ProK/EGME absorbent has a great potential for advanced CO2 capture technology.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2022
·
IF 4.889
Qinlan Luo,Qiang Sun,Qi Liu,Sen Liu,Min Xiao,Mengjie Chen,Yuanyuan Li,Hongxia Gao,Zhiwu Liang
The kinetics of CO 2 absorption in ethanolamine (MEA) + H 2 O + ethanol systems was investigated using stopped-flow apparatus. The first-order reaction rate constant ( k 0 ) values were tested with varying H 2 O and MEA concentrations. Transiting from the aqueous to non-aqueous solvents, the k 0 decreases and the reaction order for MEA shifts from 1.05 to 1.88. The zwitterion mechanism with the rate-limiting step of deprotonation was used to explore the role of water and its effect. Results showed that water could impact reactions through direct involvement and changing solvation environment. An improved kinetic model based on the zwitterion mechanism was obtained to indicate the quantitative influence of H 2 O concentration on the reaction kinetics of MEA + H 2 O + ethanol systems. The predicted values from the model well agreed to the experimental data with the average absolute relative difference of 6.73%. This study highlights the important effects of water on the reaction kinetics of CO 2 absorption into water-lean amine solutions.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）