ENERGY & FUELS
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2020
·
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
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Daofan Ma,Chunying Zhu,Taotao Fu,Youguang Ma,Xigang Yuan
A novel hybrid absorbent by combining functionalized ionic liquid (IL) 1-(3-aminopropyl)-3-methylimidazolium tetrafluoroborate [Apmim][BF 4 ] with alkanolamines (monoethanolamine (MEA) and N, N-diethylethanolamine (DEEA)) was proposed for CO 2 capture. By means of a high-speed camera, the capacity and mass transfer performance of CO 2 absorption into the hybrid absorbent were investigated experimentally in microchannel over a wide range of concentration ratios (IL: amine) at the room temperature and atmosphere pressure. Three flow patterns were observed: Taylor-bubbly flow, Taylor flow and Taylor-annular flow. The results show that the CO 2 loading and mass transfer coefficient of alkanolamine solution could be improved remarkably by the addition of an appropriate amount of [Apmim][BF 4 ]. The molar ratio 3:2 of IL to amine was found to be optimal for CO 2 loading and mass transfer. Furthermore, the influences of gas and liquid flow rates on mass transfer were studied, and a new predicting correlation for CO 2 volumetric mass transfer coefficient was proposed.
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
ChemSusChem
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2012
·Vol. 5
·期 11
·2255-2261
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IF 6.827
Dazhen Xiong,Huiyong Wang,Zhiyong Li,Jianji Wang
Graphical Recovery of Ionic Liquids: Solutions of ionic liquids (ILs) and amines are separated into aqueous two-phase systems in the presence of CO 2 , in which the upper phase is ammonium-salt-rich and the lower phase is IL-rich. Thus, the ILs in aqueous solutions can be efficiently recovered, and the amines can be regenerated by heating and bubbling Ar or N 2 through the salt-rich phase. The recovery efficiency of the ILs is as high as 99 %. Recovery is a very important factor for the industrial application of ionic liquids (ILs). In this work, a novel method is presented for the recovery of ILs by using carbon dioxide (CO 2 )-induced formation of aqueous two-phase systems (ATPSs). It was found that, in the presence of amines, introduction of CO 2 into aqueous IL solutions leads to the formation of ATPSs at 25 °C and atmospheric pressure, in which the upper phase is ammonium-salt-rich and the lower phase is IL-rich. Thus, the ILs in aqueous solutions can be significantly enriched, and the amines can be regenerated by heating and bubbling Ar or N 2 in the salt-rich phase. To better understand the recovery of ILs, the phase diagrams of the ATPSs were measured at 25 °C, and the effects of the molecular structure of the ILs and the amines and temperature of the systems on the recovery efficiency of the ILs were investigated. It was shown that the single-step recovery efficiency of the ILs could be as high as 99 % in the presence of primary or secondary amines. Therefore, this new method could potentially be sustainable, efficient, and attractive to industry.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Mingji Xu,Xi Ran,Ruoli Chen,Maoshen Chen,Ruijuan Qi,Chengqin Dai,Chunhua Luo,Hui Peng,Hechun Lin
Gas sensors based on metal/metal oxide heterostructures have shown rapid advancements due to their excellent sensing performance. However, it is difficult to control the formation of Cu/CuO nanostructure due to the easy oxidation of copper and limits its sensing application. Herein, we reported the controlled oxidation of Cu superfine particles (SPs) to form Cu/CuO nanostructure via reducing CuO with monoethanolamine, oxidized with H 2 O 2 and then in-situ annealed at 250 °C. The organic residue generated during the reducing step plays a key role in controlling the oxidation of Cu SPs to form Cu/CuO nanostructure. The nanomaterial was used to fabricate gas sensor, which presents excellent p-type sensing performance to ethanol with good selectivity and a good linear relationship in the range of 1 to 100 ppm ethanol. The response to 100 ppm ethanol can be up to 99.40 under 200 °C operating temperature, and the response under 250 °C is 30.66 with the shorter response and recovery time of 214 s and 74 s, respectively. The sensing mechanism can be explained by the adsorption–desorption model. This study provides a promising strategy for the synthesis of Cu/CuO nanostructure and open a new avenue for the development of highly sensitive ethanol sensor.
研究领域:
材料科学
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化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Hao Ling,Hongxia Gao,Zhiwu Liang
The physical solubility and mass transfer performance of CO 2 absorption into aqueous N,N-dimethylethanolamine (DMEA) solution were comprehensively studied in the present work. The physical solubility (Henry’s law constant ( He )) was measured using a stirred cell reactor for pure DMEA and aqueous DMEA at temperatures from 293.98 to 333.03 K. Then, the physical solubility of CO 2 was obtained based on the “N 2 O analogy” method. Furthermore, He was correlated successfully by using an empirical polynomial model with an average absolute relative deviation (AARD) of 4.23%. The mass transfer performance was studied in a laboratory scale structured packing absorption column at DMEA concentration of 1–4 kmol/m 3 , liquid feed temperature of 293.15–333.15 K, liquid flow rate of 3.90–11.7 m 3 /m 2 -hr, CO 2 partial pressure of 6–20 kPa, lean CO 2 loading of 0.050–0.300 mol/mol, over the inert gas flow rate range of 26.11–43.52 kmol/m 3 -hr. Based on the experimental values of He for CO 2 into aqueous DMEA solution, the effect of the gas concentration of A in gas-liquid equilibrium ( y A ∗ ) on gas phase volumetric overall mass transfer coefficient ( K G a v ) was considered in this study, but found to be an insignificant influence that can be ignored. Analogously, an attempt to correlate the mass transfer coefficient K G a v and outlet concentration of CO 2 ( y out ) using semiempirical models as function of the mentioned operational parameters was conducted. The predictive correlations for K G a v and y out of the DMEA-CO 2 -H 2 O system in structured packing column are K G a v = L 0.23 0.6144 a eq - a C / p C O 2 + 0.02327 and ln y out = l n y in - 0.77 PV G Ω L 0.23 0.6144 a eq - a C / p C O 2 + 0.02327 , with acceptable AARDs of 4.59% and 1.48%, respectively.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Qinlan Luo,Yan Ouyang,Shumin Hong,Nan Wang,Yuanyuan Li,Hongxia Gao,Gyeong S. Hwang,Bohak Yoon,Teerawat Sema,Paitoon Tontiwachwuthikul,Peng Luo,Chintana Saiwan,Zhiwu Liang
To explore the regulatory factor of phase separation and the effect of solvent structure, the phase separation behavior, absorption/desorption performance, viscosity change, heat duty and ternary phase diagram of 3 monoethanolamine(MEA)-based phasic absorbents using 3 alcohols with various carbon chain lengths and isomers were determined by comprehensive experiments. The tunable phase separation behavior of MEA-based biphasic absorbents can be achieved by adjusting the mass concentration ratio of solvent and water, and the CO 2 loading of phase separation point was much more impacted by the effect of the carbon chain length than that of isomerism. The intermolecular interactions between species in solutions before and after CO 2 absorption were analyzed by the classical molecular dynamics simulations and independent gradient model analysis. Based on the experimental and computational results, the fundamental mechanism of phase separation was elucidated, which is related to the broken of hydrogen bonds between solvent with H 2 O or MEA, and the enhanced interaction among MEACOO − , MEAH + and H 2 O. This study highlights the effect of structure effect on developing advanced CO 2 biphasic absorbents, which may reduce the energy consumption of regeneration significantly.
研究领域:
化学工程
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环境科学
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计算化学
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产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
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2022
·Vol. 25
·期 9
·2201444
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IF 4.122
Peng-Shuai Bin,Wen-Hao Geng,Tao Wang,Qiangxia Zhu,Min Li,Xiang-Le Liu,Peng-Fei Qian,Ze-Long Bao,Zhi-Xian Yang,Hong-Zhang Geng
Herein, silver nanowires (AgNWs) and aluminum-doped zinc oxide (AZO) are prepared by polyol and gel–sol method, respectively. Then bendable, strong adhesion, flat, and high optical transmittance AgNWs:AZO composite transparent conductive film (TCF) is prepared in an all-solution method. By spinning the AZO to the upper layer of the AgNW networks and annealing at 120 °C for 20 min, the junctions of the AgNW networks are welded by the capillary force in the solvent evaporation and AZO crystallization process. The sheet resistance of the TCF is as low as 12.9 Ω sq −1 at an optical transmittance of 92.1% (@550 nm), which is comparable to the indium tin oxide film on glass. The root means square roughness is reduced from 30.1 to 8.48 nm to match the criteria as anode for organic light emitting diodes (OLEDs). Furthermore, the adhesion between the AgNW networks and the substrate has been significantly improved. Finally, a flexible green OLED device with AgNW:AZO TCF as the anode is successfully prepared. The maximum luminous intensity of the prepared OLED is 10 060 cd m −2 , and the maximum current efficiency is 6.43 cd A −1 , which proves the great potential of the film in flexible electronics.
研究领域:
材料科学
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光学工程
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电子工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Qinlan Luo,Shumin Hong,Hongxia Gao,Yuanyuan Li,Nan Wang,Gyeong S. Hwang,Bohak Yoon,Zhiwu Liang
An energy-efficient monoethanolamine (MEA)/ n-butanol biphasic solution with tunable phase separation was proposed in this study. The effect of the solvation environment and the mechanism of the liquid–liquid phase separation were investigated systematically by both experimental study and molecular dynamics simulations. Experimental results showed that the concentration ratio of n-butanol and water played a significant role in the phase separation behavior and desorption performance, and can effectively reduce the heat duty of desorption. The mechanism of phase separation was obtained using 1 H NMR and molecular dynamics simulation, which was related to the strong strength of hydrogen bonds between MEAH + and H 2 O, MEACOO − and H 2 O, and the van der Waals forces between MEAH + and MEACOO − . In addition, the effect of the solvation environment on the phase separation was also attributed to the strong intermolecular interaction between MEAH + and MEACOO − . This study highlights the effect of the solvation environment on the tunable phase separation and the mechanism of phase separation for the further development of biphasic solutions.
研究领域:
化学工程
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环境科学
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计算化学
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产品关联
DOI
高影响因子
APPLIED ENERGY
·
2022
·
IF 11.446
Hangtian Hu,Mengxiang Fang,Fei Liu,Tao Wang,Zhixiang Xia,Wei Zhang,Chunliang Ge,Jingjuan Yuan
Biphasic solvents for CO 2 capture have received significant attention due to their potential for energy conservation. However, traditional biphasic solvents result in highly viscous CO 2 rich-phases and high amine losses. To overcome these drawbacks, we have developed a novel alkanolamine-based biphasic solvent by blending 2-(methylamino) ethanol (MAE), 3-(dimethylamino)propan-1-ol (3DMA1P), diethylene glycol dimethyl ether (DGM), and water. The aqueous MAE/3DMA1P/DGM solvent showed a cyclic capacity of 0.45 mol CO 2 /mol amine, which is 1.8 times that of monoethanolamine (MEA), and a desorption rate and regeneration efficiency twice those of MEA. The viscosity of the biphasic solvents can be reduced to 13.12 mPa⋅s at 313 K, which is lower than that of reported biphasic solvents. The evaluated regeneration energy was 2.33 GJ/ton CO 2 . Cation chromatography measurements revealed the tendency of MAE to accumulate in the CO 2 -rich phase with increasing CO 2 absorption loading. Quantitative 13 C NMR analyses were performed to investigate the species distribution in both phases, and DGM was found to be the major component of the CO 2 -lean phase. Different solubilities of the MAE molecules and MAE carbamate in DGM resulted in phase separation. Molecular dynamics (MD) simulations on the CO 2 -unloaded and CO 2 -loaded solutions verified the phase separation mechanism. MAE molecules tended to cluster, and the interactions between MAE and DGM dropped significantly, with increasing DGM concentration.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
L.W. Wang,F. Wu,D.X. Tian,W.J. Li,L. Fang,C.Y. Kong,M. Zhou
In this paper, Na-doped ZnO (NZO) thin films with doping contents of 3–30 at.% were synthesized on quartz glass substrates by sol–gel spin coating method. The structure, morphology, optical transmittance and photoluminescence properties of NZO films were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), atomic force microscope (AFM), UV–VIS spectrometer and fluorescence spectrophotometer, respectively. The results showed that all the NZO thin films exhibit a strong preferential c -axis orientation with a hexagonal polycrystalline structure. An apparent increase in crystallinity was observed with the increasing Na content. The surface of the heavily Na doped samples (30 at.%) exhibits nanorods morphology. The RMS roughness changed from 16.219 nm to 53.072 nm with the increase of Na concentrations. As Na doping content increases to 24 at.%, the average transmittance was still larger than 62% in the visible range. The optical band gap initially increased and then decreased nearly linearly with the increase of Na content. The refractive index of NZO films in the visible range was found to increase gradually with increasing Na dopants. Room temperature photoluminescence (PL) spectra showed sharp ultraviolet emissions centered at 388 nm and broad green–yellow emissions (450–650 nm). The violet emission centered at 424 nm appeared in the spectra of 30 at.% NZO. In addition, it was found that the low Na doping concentration contributed to the enhancement of I NBE / I DLE .
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2017
·
IF 2.323
Yangyang Bian,Yue Zhao,Shufeng Shen
Potassium prolinate + water + ethanol (ProK/W/Eth) solution has potential use as a liquid-to-solid phase-changing absorbent for energy-efficient CO2 capture process. In this study, the equilibrium solubility of CO2 in ProK/W/Eth solutions was measured in a stirred equilibrium cell at a temperature range from 293 to 343 K and CO2 partial pressures up to 200 kPa. Density and viscosity were also measured at temperatures from 293 to 333 K and ProK molality up to 6.09 mol·kg–1 ethanol. Moreover, the CO2 loading and cyclic capacity were compared with aqueous monoethanolamine (MEA) and aqueous ProK solution. The solubility data were well-represented using a Soft model with AAD within 8.0%. The data of density and viscosity were also correlated with empirical models. The predicted results matched well the experimental data with AAD within 0.37% for density and 1.38% for viscosity.
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
JOURNAL OF CHEMICAL THERMODYNAMICS
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2017
·
IF 2.726
Shufeng Shen,Yue Zhao,Yangyang Bian,Yong Wang,Hui Guo,Hui Li
The solubility of CO 2 in aqueous potassium lysinate (LysK) solutions was measured in a stirred reactor at temperatures from 298 to 353 K, for 9.0, 17.4, 25.3, 33.1 and 41.2 mass% LysK and CO 2 partial pressures up to 110 kPa. The vapor-liquid equilibrium (VLE) data were interpreted using the modified Kent-Eisenberg model. The apparent equilibrium constants of carbamate hydrolysis and amino acid deprotonation were correlated as a function of temperature, CO 2 loading (expressed as mole CO 2 per mole LysK) and LysK concentration to fit the experimental solubility data. The proposed model satisfactorily predicted the VLE data for the H 2 O-LysK-CO 2 system, especially at moderate to high CO 2 loading, with an average absolute deviation within 3.2%. Liquid species in the CO 2 -loaded LysK solutions were also qualitatively characterized by 13 C NMR experiments.
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
危险品化学品经营许可证（带存储）