CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
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IF 3.8
Wenjian Yue,Xiaojiang Li,Junhao Jing,Li Tong,Na Wang,Hongsheng Lu,Zhiyu Huang
Dining lampblack as a source of atmospheric pollution, urban residents had to spend a lot of economic costs all year round to solve its impact. However, traditional treatment methods often carry the risk of secondary pollution. The use of phase change absorption solvent (PCAS) controlled by CO 2 can effectively absorb the oily components in dining lampblack, and smoothly avoid the generation of secondary pollutants and squandering of resources. The reversibility of PCASs under CO 2 control was explained by pH changes and macroscopic visualizations. The absorption effects of favorable absorbents and PCASs on dining lampblack were compared and analyzed. The fatty acid (FA) in the oil absorption mixture was desorbed by interacting with D230. The results of GC/MS analysis on the oil components separated by desorption showed that the desorption of PCASs was effective for these refractory oil components. FAs can be enriched and applied to the subsequent dining lampblack treatment link to realize the waste recycling. In addition, the absorption and desorption of oily components by PCASs were combined with the CO 2 -controlled phase transformation of PCASs itself to achieve the absorption circulation of treating dining lampblack by using PCASs.
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高影响因子
COMBUSTION AND FLAME
·
2023
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IF 4.4
Yitong Zhai,Qiang Xu,Beibei Feng,Can Shao,Zhandong Wang,S. Mani Sarathy
Low-temperature (low-T) oxidation experiments of n -heptane –with and without NO addition– were experimentally and numerically investigated at stoichiometric conditions in a jet-stirred reactor. Experiments were performed at atmospheric pressure over a temperature range of 500–800 K. Reactants, intermediates, and products, were measured using synchrotron vacuum ultraviolet photoionization mass spectrometry . A detailed kinetic model was developed to gain insight into the chemical effect of NO on low-T oxidation chemistry of n -heptane. Taking 650 K as the transition temperature, the results revealed that NO addition exhibited an inhibiting effect on fuel reactivity below 650 K and a promoting effect above 650 K. The reactions of ROO + NO = RO + NO 2 and HO 2 + NO = OH + NO 2 at different temperature regions were responsible for the inhibition and promotion effects, respectively. Evidence gathered from both experimental measurements and kinetic model predictions indicated that NO addition had a significant inhibitory effect on the formation of cool flame species during the low-T oxidation process. NO suppressed low-T oxidation via the reaction of ROO + NO = RO + NO 2 , which impeded the subsequent isomerization, O 2 addition, OH-, and HO 2 -elimination reaction, and influenced product distribution of the cool flame species. The experimental observations provided detailed information about these reactive intermediates, which offered new insights into low-T oxidation phenomena and clarified the importance of NO reactions which prevent the formation of cool flame products during low-T oxidation.
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CATALYSIS LETTERS
·
2023
·
IF 2.8
Chen Yao,Li Shuyue,Li Yuchao,Zheng Yanxia,Zuo Cuncun,Ge Tingting,Xu Rui,Huang Haofei,An Jiutao
Nano-Au particles are commonly used as an active component in oxidation esterification reactions. To inhibit the agglomeration of nano-Au particles, a series of highly stable Au@CeO 2 /MnO x core–shell structured catalysts were synthesized using inverse microemulsion technology for the oxidative esterification to prepare methyl methacrylate (MMA). The core–shell structured catalysts were prepared by using two different surfactants (CTAB and CO-520) and adjusting the molar ratio of water to oil (ω). XRD, Raman, N 2 adsorption, ICP−MS, TEM, UV–vis, FT-IR, XPS, and H 2 -TPR were applied to characterize the samples. The nano-Au particles were encapsulated by CeO 2 , forming a core–shell structure confirmed with TEM. The Au@CeO 2 /MnO x -C-ω = 10 catalyst prepared with CTAB as the surfactant has the best activity. The Au@CeO 2 /MnO x -C-ω = 10 catalyst has the highest hydrogen consumption and Ce 3+ content, indicating that the catalyst has the strongest interaction among Ce, Au, and Mn and more active oxygen. Active oxygen is beneficial to methanol activation and hemiacetal dehydrogenation, accelerating the formation of esters. The active oxygen content, Ce 3+ content, and H 2 consumption were correlated with the catalytic performance positively. After the catalyst was reused 10 times, the activity remained unchanged and the Au nanoparticles did not agglomerate due to the core–shell structure. Graphical Abstract
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高影响因子
Journal of Water Process Engineering
·
2023
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IF 7
Qian Xu,Xiujun Wang,Weixin Hu,Jian Zhang,Ming Duan,Shenwen Fang
Cationic polyamide-amine dendrimer can promote the clarification performance of nonionic block polyether water clarifier for treating produced water from heavy oil field, but the reason is lack of study. In this paper, a cationic polyamide-amine dendrimer TA which can effectively improve the oil removal speed of nonionic polyether DMEA-PE and reduce the onset temperature of DMEA-PE clarification performance was prepared, and the reason was explored from both thermodynamic and dynamic aspects by studying the effect of TA on the hydrophilic-lipophilic deviation (HLD) equation and oil-water interface behavior of DMEA-PE. The research results showed that TA moved up the HLD vs T curve of DMEA-PE and decreased its temperature corresponding HLD = 0, which was a favor of decrease in onset temperature of DMEA-PE clarification performance. TA had no effect on the DMEA-PE's capacity of oil-water interface adsorption and decreasing oil-water interface film strength. However, TA can reduce the electronegativity of oil droplet in water and enhance the oil droplets coalescence, hence the oil removal speed and efficiency of DMEA-PE were enhanced. This is the first time that HLD concept was used to investigate the action mechanism of composite water clarifier and the results are useful for the water clarifier design.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
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IF 7.4
Youchao Chen,Junxian Huang,Yaseen Muhammad,Zhenxia Zhao,Shencheng Fan,Wenjie Luo,Jing Li
Based on the four-component separation technology of asphalt, the influence mechanism of carbon nanotubes (CNTs), graphene microsheets (GNPs) and graphene oxide (GO) in SBS-modified asphalt four-component was systematically analyzed by combining macroscopic properties and microscopic characteristics, as well as exploring the morphological distribution of SBS in asphalt four-component. According to the results of Fourier transform infrared spectroscopy and field emission scanning electron microscopy, the modification mechanism of asphalt by three types of carbon nanomaterials follows two pathways: chemical reaction and physical blending. The addition of CNTs, GNPs, and GO results in the destruction of long carbon chains of the saturated fraction in SBS-modified asphalt, and promotes the aggregation of SBS in the asphaltene, as well as its dense distribution and crosslinking in the oil fractions. The results of the fluorescence microscopy test and phase separation test showed that the dispersing effect of the three carbon nanomaterials could alleviate the aggregation phenomenon of SBS, improve the mutual integration between SBS and matrix asphalt, and promote the storage stability of SBS-modified asphalt. Therefore, based on the excellent mechanical properties of the three carbon nanomaterials and their promotion of filling and crosslinking of SBS in asphaltene, they have made significant contributions to the mechanical properties of carbon nanomaterials-composite SBS modified asphalt. This can also be demonstrated by DSR testing and conventional physical property testing. This study hopes to provide a viable analytical route for the use of nanomaterials in modulating the four-component structure and improving the properties of asphalt.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
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IF 6
Ziwen Ying,Shuang Liu,Guannan Li,Qifeng Wei,Xiulian Ren
As an essential separation and purification method, solvent extraction was widely used in many fields. In previous studies, extractants had received much attention, while the role of diluents had often been ignored. However, the diluent had a very complex effect on the extraction process. In the study, the influence of diluent on the extraction of chromium with amide as an extractant was discussed in detail. In order to increase the universality of the study, the common organic solvents, including alkanes, aromatic hydrocarbons, and halohydrocarbons, were selected as diluents. The extraction performance, formation of extracted complex, and thermodynamics under different diluents were determined. In addition, FT-IR and UV–Vis spectral analyses have been carried out to investigate the influence of diluent on the spectrum. The results showed that the diluent had an obvious influence on the spectrum of the amide group before extraction, and the influence was weakened after extraction. Based on the analysis of molecular electrostatic potential, the effect of diluent on the reaction site of amide extractant was investigated. Further, the molecular polarity index was used to calculate polarity parameters and deepen the understanding of the effect of diluent on the extraction process. The study provided a theoretical basis for other extraction systems to select appropriate diluents.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
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IF 6
Boxuan Lou,Yue Xu,Xiaolan Qin,Chang Liu,Shujun Wang,Haikuan Yuan,Xijian Liu,Lijuan Zhang,Jie Lu
In this work, the solubility of unsolvated crystalline (R)-equol in six (alcohols + n -heptane) binary solvents and that of solvated crystalline (R)-equol in methanol along with ethanol were firstly systematically measured and analyzed. The experimental results revealed that the solubility of unsolvated crystalline (R)-equol was positively correlated with temperature and mass fraction of alcohol. And the solubility order was 2-propanol > 1-propanol > 1-butanol > 1-pentanol > 3-methyl-1-butanol > 2-methyl-1-propanol > n -heptane. The transformation temperatures between unsolvated and solvated forms were acquired at 316.28 K and 310.50 K, respectively. Meanwhile, the experimental solubility data of unsolvated crystalline (R)-equol were correlated using modified Apelblat, λh , quartic polynomial and CNIBS/R-K equations, in which the modified Apelblat equation achieved the best regression performance. Besides, the dissolution of unsolvated crystalline (R)-equol was endothermic. Furthermore, solvent parameters, solvation free energy and molecular electrostatic potential surface obtained through molecular simulation were used to explain the experimental phenomena, and found the polarity of solvents, van der Waals and hydrogen bonding interactions made different contributions to various dissolution processes.
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高影响因子
FUEL
·
2022
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IF 8.035
Xu He,Zechang Liu,Houshi Jiang,Fengshan Liu,Qing Yang,Zhenghui Jiang,Guangyuan Feng
The laminar burning velocity and Markstein length of TRF ( n -heptane, isooctane, and toluene)-air mixtures were investigated at the initial temperature of 400 K and 453 K, initial pressure of 1 bar, and an equivalence ratio range of 0.8–1.5. The effects of extrapolation radius ( R f ) and Markstein length ( L b ) were discussed on the linear and nonlinear extrapolation models. The results showed that the linear model leads to higher extrapolation result for all equivalence ratios compared with the nonlinear model due to the differences in the third term of Taylor expansion. Finally, the laminar burning velocity and Markstein length uncertainty caused by the extrapolation model can be minimized by adjusting L b R f 1 ( R f1 refers to the flame initial extrapolated radius). When the value of L b R f 1 was below 0.012, the laminar burning velocity and Markstein length uncertainty can be controlled at < 0.05 and < 0.5, respectively.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
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IF 9.5
Huange Zhen,Mengyuan Wu,Zhijie Yuan,Zhibo Qi,Yingshuang Meng,Xihong Zu,Dan Liu,Gaohong He,Xiaobin Jiang
Nanofiltration (NF) is a promising technique to achieve sustainable and efficient separation of antibiotics with high industrial value. In this work, carboxymethyl- β -cyclodextrin (CM- β -CD) modified nanofiltration membrane was fabricated through interfacial polymerization (IP) for high concentration cephalexin solution separation, which is a classic antibiotic pharmaceutical wastewater. In principle, CM- β -CD can slow down the diffusion of amine monomers via electrostatic attraction, steric effect, hydrogen bonding and adsorption of the piperazine (PIP) monomer onto the hydrophilic surface, which renders amine monomer the high local concentration. The fabricated NF membranes possessed a larger proportion of dense primary layer on the surface. In addition, the accumulation of CM- β -CD between the substrate membrane and polyamide (PA) layer played the role as a barrier with specific cavity structure and bulk carboxylate to enhance the rejection of cephalexin. The cavity structure and stacking gap of CM-β-CD simultaneously rendered the membrane interlayer highly permeable. The optimal CM- β -CD modified membrane exhibited high rejection of cephalexin (94.7%) and water permeability of 122.4 L m −2 h −1 MPa −1 when the concentration of cephalexin was 3473.9 ppm (10 mmol/L). This work furnished an available way to prepare a novel nanofiltration membrane with efficient separation performance for relevant pharmaceutical production wastewater.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
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IF 6
Li Wang,Yi Zeng,Hongsheng Lu,Zhiyu Huang,Ya Liu
Organogelators and hydrogelators which belong to low-molecular-weight gelators (LMWGs) have attracted considerable attention due to various practical applications. Whether organogelators or hydrogelators, they can congeal single oil or water phase. However, gelators capable of gelation at oil/water interface have thus far remained unexplored. Herein, we report a class of surface-active ionic liquids (SAILs) based on dimethylcyclohexylamine and fatty acids. They can form high-strength gels at the oil/water interface instead of in single oil or water phase. These molecules spontaneously aggregate at oil/water interface, and then self-assemble into lamellar liquid crystalline structure, as evident from POM and SAXS analysis. Rheology analysis shows that these gels are of very high viscosity, strength and stability. These unique characters make these SAILs can effectively block the oil–water interface, which has potential application in oilfield development or oil leaks from underwater tubes.
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高影响因子
Foods
·
2022
·Vol. 11
·期 24
·4073
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IF 5.561
Yingrui Ji,Dongming Lan,Weifei Wang,Kok Ming Goh,Chin Ping Tan,Yonghua Wang
With the prevalence of edible diacylglycerol (DAG) oil, which is beneficial to human, the generation of 3-monochloropropanediol esters (3-MCPDE) and glycidyl esters (GE) as well as the stability of physical properties during heat-induced processing still need to be explored. In this study, the experiment used olive-based edible oil with different contents of DAG (40, 60, and 80%) to make crackers and fry chicken. They were heated at 160 and 180 °C to determine the changes in 3-MCPDE and GE, the crackers’ hardness and gumminess, and the physical properties of the oil. During baking and frying, 3-MCPDE decreased, while the content of GE slightly increased with the prolonged heating duration. Finally, 3-MCPDE and GE were lower than 1.25 mg/kg and 1.00 mg/kg, respectively. The AV increased proportionally as duration increased and POV was below 0.30 g/100 g. In general, the changes in 3-MCPDE and GE were related to the heating temperature and duration, and not significantly (p> 0.05) related to the content of DAG.Keywords:3-MCPD ester;glycidyl ester;diacylglycerol;crackers;frying oil
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PubMed
高影响因子
CHEMICAL ENGINEERING RESEARCH & DESIGN
·
2023
·
IF 3.9
Wanyi Tao,Bo Zhang,Luxia Yin,Xiao Teng,Zhang Wen,Zekai Zhang,Wensheng Ning
Fabrication of adsorbent can play an important role in the adsorption desulfurization technology as a most promising deeply desulfurization technology. Ag 2 O/CeO 2 /SiO 2 aerogel composites were synthesized, where the easy oxidation of Ce 3+ into Ce 4+ was realized by adding hydrogen peroxide, and were utilized to remove thiophenics from model fuels and aromatics. Compared with Ag 2 O/SiO 2 and CeO 2 /SiO 2 , the adsorption uptake and solvent washing regeneration performance of Ag 2 O/CeO 2 /SiO 2 for thiophene was obviously enhanced, and the adsorption selectivity for thiophene in the presence of aromatics was relatively close to CeO 2 /SiO 2 , attributed to that Ag 2 O/CeO 2 /SiO 2 adsorbed thiophenics via the π-Ag + complexation and S-Ce bonding, where the latter was main interaction. However, there was no synergistic interaction between Ag and Ce species acted as adsorption sites in the Ag 2 O/CeO 2 /SiO 2 , which could be supported by that the chemical state of Ag and Ce in Ag 2 O/CeO 2 /SiO 2 was consistent with corresponding one in Ag 2 O/SiO 2 and CeO 2 /SiO 2 , respectively. Among Ag 2 O/CeO 2 /SiO 2 aerogel composites with different molar ratios of Si/Ce, Ag 2 O/CeO 2 /SiO 2 -50 performed the best, its adsorption uptake for thiophene, benzothiophene and dibenzothiophene from model fuels arrived at 20.4, 21.8 and 27.2 mg-S/g ads , respectively. Langmuir and Freundlich adsorption isotherm models, the pseudo-second-order kinetic model could well describe the adsorption of thiophenics over Ag 2 O/CeO 2 /SiO 2 -50.
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