Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Bingke Tian,Chaofeng Huang,Yingshuang Zhang,Cong li,Hongru Jiang,Chongqing Wang,Hui Wang,Shangbo Zhang,Liuchuang Zhao
Plastics are extensively used in packaging, automobiles, sanitation, agriculture, and architecture due to their lightweight, malleability, corrosion resistance, and low cost. However, their short lifespan leads to the rapid accumulation of plastic waste. Therefore, recycling waste plastics is crucial to conserve resources and protect the environment from "white pollution." This study developed a flotation process to facilitate the recycling of common polyesters by separating polyamide (PA), polycarbonate (PC), polyethylene terephthalate (PET), polymethyl methacrylate (PMMA), and polyurethane (PU). The flotation process was based on a hydrophilic gradient induced by modification with methanol, ethanol, and ethanolamine. The floatability sequence of the polyesters was PA < PU < PET < PC < < PMMA in the methanol-based system, PA < PU < PET < < PC ≈ PMMA in the ethanol-based system, and PET < PU < PA < < PC < PMMA in the ethanolamine-based system. The floatability of the polyesters was closely related to the reactivity of ester exchange. Based on the hydrophilic gradients, a cascaded flotation process was designed, following the ester exchange mechanism, to sequentially recover PET, PA, PC, and PMMA. PA, PET, and PU were the sinking plastics after modification with methanol, ethanol, and ethanolamine, respectively, while only PC remained hydrophilic after methanol modification. The purity of PA, PC, PET, and PMMA was 95.10 %, 93.68 %, 89.39 %, and 86.42 %, respectively, with recovery rates of 82.96 %, 83.90 %, 96.08 %, and 100 %. This study presents a promising approach for the flotation separation of waste polyesters.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xiaoda Wang,Lumin Han,Weican Wang,Ling Li,Ting Qiu
The enzymatic reaction–distillation coupling process is a promising technology to realize the chiral resolution of (R/S)-1-phenylethanol with ethyl butyrate and ethanol as acyl donor and byproduct, respectively. In order to design such a coupling process, the vapor–liquid equilibrium (VLE) data are necessary. However, these data were incomplete in literatures. In this work, the isobaric VLE experiments were conducted at 101.3 kPa for the binary systems of 1-phenylethanol + ethyl butyrate, 1-phenylethanol + ethanol, 1-phenylethyl butyrate + ethyl butyrate, 1-phenylethyl butyrate + ethanol, and 1-phenylethyl butyrate +1-pheny ethanol. Additionally, the saturated vapor pressure of 1-phenylethyl butyrate was measured in the temperature range 420–500 K and correlated with the Antoine equation. Both the Non-Random Two Liquid (NRTL) and Wilson models were used for the correlation of experimental VLE data. Both models showed satisfactory accuracy, although the Wilson model performed slightly better than the NRTL model. This work would provide important thermodynamic information for the design of enzymatic reaction–distillation coupling process to realize the chiral resolution of (R/S)-1-phenylethanol.
研究领域:
化学工程
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生物化学
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2019
·
IF 4.561
Hui Guo,Yu Dong,Tiantian Ping,Xiaoqin Shi,Shufeng Shen
Densities and viscosities for the binary liquid mixtures of monoethanolamine (MEA) with 2-alkoxyethanols (2-ethoxyethanol (EGEE) and 2-butoxyethanol (EGBE)) were measured over the entire concentration range at temperatures of 293.15–353.15 K and atmospheric pressure. From the experimental results, the excess molar volume ( V E ), viscosity deviations (∆ η ) and excess Gibbs free energy of activation of viscous flow (∆ G ⁎E ) were calculated and the excess/deviations properties for the studied binary systems were fitted with the Redlich-Kister equation to estimate the binary interaction parameters. The results were analyzed in terms of intermolecular interactions between unlike molecules and intramolecular interactions within like associated molecules. The densities and viscosities of CO 2 -loaded solutions were also measured and correlated with the proposed correlations. The calculated values of density and viscosity for the binary/ternary systems are in good agreement with the experimental values, with AADs within 0.2% for density and 3.2% for viscosity. The FTIR spectral analysis for the binary mixtures of MEA with 2-alkoxyethanols at various concentrations suggests the presence of weak interactions between component molecules in the systems, and also supports the findings of excess properties.
研究领域:
物理化学
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分子相互作用
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DOI
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Hui Yang,Tingting Guo,Kang Qin,Qingyun Liu
Layered double hydroxides (LDHs) have been known as highly desired anode materials in the alkaline electrolyte. With regard to non-noble metal electrocatalysts, the interlayer spacing of LDHs has important influences on the electrocatalytic activity toward ethanol oxidation. Herein, ZnCo-LDHs with different interlayer spacing controlled by different interlayer anions (NO3–, Cl–, and CH3COO–) are used as effective non-noble metal electrocatalysts for the ethanol oxidation reaction (EOR). The interlayer spacing of three non-noble metal electrocatalysts follows the order: ZnCo-LDH-CH3COO– (0.763 nm) > ZnCo-LDH-Cl– (0.733 nm) > ZnCo-LDH-NO3– (0.719 nm). ZnCo-LDH-CH3COO– exhibits the highest mass activity (345.4 mA mg–1) for the EOR, which is 1.22 and 1.37 times higher than that of ZnCo-LDH-Cl– (283.8 mA mg–1) and ZnCo-LDH-NO3– (252.8 mA mg–1), respectively, attributed to the enlarged interlayer space. This work proposes a potential mechanism of the catalytic process toward the EOR, which may provide a new idea to design non-noble metal electrocatalysts with high catalytic activity in direct ethanol fuel cells (DEFCs).
研究领域:
材料科学
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电化学
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能源催化
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
·
IF 2.298
Xiaoqin Shi,Chenxu Li,Hui Guo,Shufeng Shen
Blends of amines with alkoxyethanols have been potentially used as alternative absorbents to conventional aqueous amines for energy-efficient CO2 capture, due to the lower specific heat capacity and enthalpy of vaporization of organic solvents than water. In this work, densities and viscosities were measured at atmospheric pressure for binary liquid mixtures of 2-(methylamino)ethanol (MAE) + 2-methoxyethanol (EGME), MAE + 2-ethoxyethanol (EGEE), and MAE + 2-butoxyethanol (EGBE) over the entire composition range and at temperatures of 293.15–353.15 K. The excess molar volume and viscosity deviations were also calculated and fitted by the Redlich–Kister equation. The calculated values of density and viscosity from the proposed correlations are in good agreement with the experimental values, with average absolute relative deviations within 0.06 and 1.23% for density and viscosity, respectively. The variations of excess or deviation properties with temperature and components were also discussed in terms of intermolecular interactions and structural effects.
研究领域:
化学
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物理化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
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2023
·
IF 2
Miao Qiao,Xin Hua,Yongjun Yuan,Xi Cao
This work attempts to achieve the enrichment of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in acylglycerols as well as biodiesel production by investigating the performance of various lipases in ethanolysis. The ethanolysis activities of five immobilized lipases in decreasing order were as follows: Lipozyme TL IM, Novozym 40086/Lipozyme RM IM, Novozym 435 and Rhizopus oryzae lipase immobilized on polypropylene (RO PP). EPA could be enriched to a certain content by Lipozyme TL IM, Novozym 40086, Lipozyme RM IM, and RO PP. The enrichment of DHA was achieved well by those four sn -1,3 regioselective lipases, and DHA contents in acylglycerols were the highest when Lipozyme TL IM and Novozym 40086 were used, reaching 2.87-fold and 2.81-fold of the initial content. However, Novozym 435 could not enrich EPA and DHA effectively. Fatty acid ethyl esters produced in this work contained abundant palmitic acid and palmitoleic acid, which could be ideal biodiesel considering their chain length. The competitive factors of five lipases towards DHA were all significantly higher than those towards EPA. When Lipozyme TL IM and Novozym 40086 achieved the maximum DHA contents, their DHA recoveries in acylglycerols reached 91.87% and 89.00%, respectively. The DHA recoveries were all significantly higher than the corresponding EPA recoveries in the reactions catalyzed by five lipases. Moreover, Lipozyme TL IM could be a potential lipase for the separation of EPA and DHA. This study may promote the full use of fish oil and broaden the application of lipases.
研究领域:
生物化学
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食品科学
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酶工程
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DOI
高影响因子
Industrial Chemistry & Materials
·
2023
·
IF 0
Tian Ye,Yuhao Bai,Kewei Wang,Weijie Hu,Meng Zhang,Li-Ming Wu
Control over the pore structure of zeolite is very important, so researchers are trying to regulate the pore structure of zeolite through various methods to endow it with better performance in industrial applications. Here, a confined etching route that could selectively increase the microporous structure of zeolite is developed using ethanol/amine buffer solution. Ethanol is introduced into an aqueous amine solution, where it could decrease the migration rate and concentration of hydroxyl ions which can etch the framework atoms of zeolite to fabricate various porous structures, consequently developing a confined etching route that could selectively increase the microporous structure of zeolite, unlike conventional approaches that generally increase mesoporous and macroporous architectures. In addition, ethanol enhances the solubility of amine in water, and a buffer solution (ethanol/amine) is formed, which is able to release hydroxyl ions continuously. Based on the above confined etching route, a micropore-increased beta crystal is synthesized and when used as a carrier in ZnLaY/beta catalysts, it achieves excellent ethanol conversion of 96.04% and butadiene selectivity of 64.22% in 20 h time-on-stream in an ethanol to butadiene reaction.
Keywords: Ethanol; Confined etching route; Micropore-increased; Beta zeolite; Ethanol to butadiene.
研究领域:
材料科学
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化学工程
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DOI
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2015
·
IF 2.679
Dong Fu,LeMeng Wang,Pan Zhang,ChenLu Mi
The saturated solubility of CO 2 in monoethanolamine (MEA) promoted 2-diethylaminoethanol (DEAE) aqueous solution was investigated at temperatures ranging from (303.2 to 323.2) K. The mass fraction and temperature dependences of the saturated solubility and CO 2 loading are illustrated. The viscosities of both CO 2 -unloaded and CO 2 -loaded DEAE–MEA aqueous solutions were measured and then calculated by using the Weiland equation. The effects of temperature, mass fraction and CO 2 loading on viscosities are demonstrated.
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
JOURNAL OF RAMAN SPECTROSCOPY
·
2022
·Vol. 54
·期 2
·191-200
·
IF 2.727
Yuhao Xie,Siwei Yang,Shenghua Zhou,Jiazhen Liu,Shuai Zhao,Shangzhong Jin,Qiang Chen,Pei Liang
Raman spectroscopy is widely used in the identification of substances. Raman spectra contain molecular information from various components and interference from noise and instruments. Therefore, using Raman spectroscopy to identify components is still challenging, especially for substances with high similarity. In this study, a class of highly similar products (methanol and ethanol) and a multicomponent mixture of propanol and water were tested using a portable Raman spectrometer. They are divided into 11 categories according to the volume fraction ratio. A total of 5,060 groups of Raman spectrum data were obtained, constituting the data set of this study. The deep neural network structure adopted in this study is based on ResNet architecture, on which the SE module in the attention mechanism is added, which increases the weight of some spectral features and achieves significant performance improvement. Finally, SE-ResNet achieves a recall of 0.95, a precision rate of 0.95, a Micro-F1 of 0.95, and an accuracy rate of 99.20%.
研究领域:
分析化学
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人工智能
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光谱学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
·
IF 7.2
Meng-yuan Ding,Juan Wang
Photocatalytic hydrogen production is of great significance for the transformation of energy system . To improve the hydrogen production performance, nano-photocatalysts including pure TiO 2 and NiO-TiO 2 were prepared by sol-gel method in this paper. To unravel reaction intermediates and pathways, the adsorption experiments and photocatalytic reaction of ethanol over the photocatalysts were carried out in combination with in situ DRIFTS technique, and the main products in the photocatalytic process were detected through gas chromatography . The results showed that 2NiO-TiO 2 as the optimum photocatalyst can yield the maximum H 2 rate at 20.10 mmol g −1 h −1 . For the adsorption of ethanol on TiO 2 and 2NiO-TiO 2 , the molecular form of ethanol is more dominant than the dissociated form, and CH 3 CH 2 OTi is more easily generated on 2NiO-TiO 2 than pure TiO 2 . The hydrogen production pathway changes by doping with NiO, reducing the production of acetic acid and aldehydes and producing the important intermediate CH 2 CHOTi.
研究领域:
能源科学
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催化化学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Daofan Ma,Chunying Zhu,Taotao Fu,Xigang Yuan,Youguang Ma
The densities and viscosities of binary mixtures monoethanolamine (MEA) + H 2 O, 2-(Diethylamino)ethanol (DEEA) + H 2 O, MEA + DEEA and ternary mixtures MEA + DEEA + H 2 O were measured over the entire composition at temperatures ranging from (293.15 to 333.15) K and atmospheric pressure. The volumetric and viscometric properties such as excess molar volume, partial molar volume, partial molar volume at infinite dilution, apparent molar volume, viscosity deviation, molar enthalpy, molar entropy and the molar Gibbs energy of activation for viscous flow of mixtures were calculated in terms of experimental data, respectively. Furthermore, excess molar volumes were fitted by the Redlich–Kister equation for binary mixture and by Cibulka equation for ternary solution. The volumetric and viscometric properties were analyzed through the molecular structure and intermolecular interactions.
研究领域:
物理化学
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热力学
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DOI
高影响因子
AICHE JOURNAL
·
2018
·Vol. 64
·期 7
·2515-2525
·
IF 3.326
Helei Liu,Moxia Li,Xiao Luo,Zhiwu Liang,Raphael Idem,Paitoon Tontiwachwuthikul
In this work, Diethanolamine (DEA) was considered as an activator to enhance the CO 2 capture performance of Monoethanolamine (MEA). The addition of DEA into MEA system was expected to improve disadvantages of MEA on regeneration heat, degradation, and corrosivity. To understand the reaction mechanism of blended MEA-DEA solvent and CO 2 , 13 C nuclear magnetic resonance (NMR) technique was used to study the ions (MEACOO - , DEACOO – , MEA, DEA, MEAH + , DEAH + , , ) speciation in the blended MEA-DEA-CO 2 -H 2 O systems with CO 2 loading range from 0 to 0.7 mol CO 2 /mol amine at the temperature of 301 K. The different ratios of MEA and DEA (MEA: DEA = 2.0:0, 1.5:0.5, 1.0:1.0, and 0:2.0) were studied to comprehensively investigate the role of DEA in the system of MEA-DEA-CO 2 -H 2 O. The results revealed that DEA performs the coordinative role at the low CO 2 loading and the competitive role at high CO 2 loading. Additionally, the mechanism was also proposed to interpret the reaction process of the blended solvent with CO 2 . © 2018 American Institute of Chemical Engineers AIChE J , 64: 2515–2525, 2018
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
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