JOURNAL OF APPLIED POLYMER SCIENCE
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2017
·Vol. 135
·期 5
·45765
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IF 1.86
Leiqing Hu,Jun Cheng,Yannan Li,Jianzhong Liu,Junhu Zhou,Kefa Cen
To optimize the CO 2 permeation and CO 2 /H 2 separation performance of hollow fiber-supported polydimethylsiloxane (PDMS) membranes, the effect of the viscosity of the PDMS coating solution on surface morphologies, thickness of PDMS layer, and solution intrusion into surface pores of hollow fiber supports was investigated. Increases in both stirring time and standing time could increase the viscosity of the PDMS solution. The PDMS layer thickness increased when the coating solution viscosity increased, whereas the surface roughness of the PDMS layer markedly decreased and then slightly changed. Moreover, when the stirring time of the PDMS coating solution was 9 min and the standing time was increased from 2 min to 25 min, the CO 2 permeance first decreased, then increased to ∼2250 GPU probably due to the decreased intrusion depth, and finally decreased because of the substantially increased thickness of the PDMS layer. However, the CO 2 /H 2 selectivity increased to 3.4 with an increase in coating solution viscosity. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45765.
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RSC Advances
·
2017
·Vol. 7
·期 77
·48526-48536
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IF 3.108
Qian Zeng,Jinwei Zhang,Hongye Cheng,Lifang Chen,Zhiwen Qi
Ionic liquids (IL) become more promising in industrial applications, especially in desulfurization processes. It is of great importance to investigate their corrosivity to steel and the effect of steel corrosion on desulfurization performance. In this work, the corrosion behavior of two typical metals, namely mild steel and stainless steel, in 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO4) IL systems for desulfurization application were investigated by weight loss and surface analyses. The model oil can inhibit the IL corrosivity, while the presence of water or H2O2 enhances the corrosion degree. The bonding information of [BMIM]HSO4 adsorbed on a steel surface was confirmed using ATR-FTIR. It was found that the IL film is mainly adsorbed on the metal surface by the interaction of the imidazolium group of the cation and HSO4− of the anion with the steel surface. From the ICP-MS and Raman analyses, the primary component of corrosion products is iron sulfate (ferric sulfate for mild steel and ferrous sulfate for stainless steel). Localized corrosion (pitting and/or intergranular corrosion) appears on steel surface from SEM observation, which could be a serious safety risk to the [BMIM]HSO4-based desulfurization systems for industrial application. The corrosion has a side effect on the desulfurization performance of [BMIM]HSO4.
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Biomed Research International
·
2015
·
IF 1.579
Mingjie Deng,Meiling Zhang,Fa Sun,Jianshe Ma,Lufeng Hu,Xuezhi Yang,Guanyang Lin,Xianqin Wang
Gas chromatography-mass spectrometry (GS-MS) in combination with multivariate statistical analysis was applied to explore the metabolic variability in urine of chronically hydrogen sulfide- (H2S-) poisoned rats relative to control ones. The changes in endogenous metabolites were studied by partial least squares-discriminate analysis (PLS-DA) and independent-samples t-test. The metabolic patterns of H2S-poisoned group are separated from the control, suggesting that the metabolic profiles of H2S-poisoned rats were markedly different from the controls. Moreover, compared to the control group, the level of alanine, d-ribose, tetradecanoic acid, L-aspartic acid, pentanedioic acid, cholesterol, acetate, and oleic acid in rat urine of the poisoning group decreased, while the level of glycine, d-mannose, arabinofuranose, and propanoic acid increased. These metabolites are related to amino acid metabolism as well as energy and lipid metabolism in vivo. Studying metabolomics using GC-MS allows for a comprehensive overview of the metabolism of the living body. This technique can be employed to decipher the mechanism of chronic H2S poisoning, thus promoting the use of metabolomics in clinical toxicology.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
·
IF 2.729
Meiling Zhang,Congcong Wen,Yuan Zhang,Fa Sun,Shuanghu Wang,Jianshe Ma,Kezhi Lin,Xianqin Wang,Guanyang Lin,Lufeng Hu
This study aims to evaluate the effect of ketamine on rats by examining the differences in serum metabolites between ketamine abuse group (Ket-group) and control group (Con-group). Compared to the Con-group, the level of phosphate, propanoic acid, ribitol and d -fructose of the Ket-group increased after continuous intraperitoneal administration of ketamine for 7 days, while the level of alanine, glycine, butanoic acid, valine, l -serine, l -proline, mannonic acid, octadecanoic acid and cholesterol decreased. After 14 days’ administration, the level of alanine, butanoic acid, valine, l -leucine, phosphate, l -serine, l -threonine, propanetricarboxylic acid, hexadecanoic acid and oleic acid of the ketamine group increased while the level of mannonic acid, octadecanoic acid and cholesterol decreased. After stopping ketamine administration for 2 days, the level of butanoic acid, phosphate, aminomalonic acid, gluconic acid, hexadecanoic acid, oleic acid and arachidonic acid of Ket-group increased, while the level of glycine, l -lysine and cholesterol decreased. This study can provide invaluable information for the metabolites changes due to ketamine abuse.
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COMBUSTION SCIENCE AND TECHNOLOGY
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2013
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IF 1.011
Ming-Di Li,Zhong Wang,Yang Zhao,Rui-Na Li,Shuai Liu
An experimental study was reported on premixed ethanol/n-heptane/oxygen/argon flames at low pressure (4.655 kPa) with ethanol blending ratios of 0 (Flame 1), 15% (Flame 2), and 30% (Flame 3). The equivalence ratio was 1.0. Flame species were identified using molecular beam mass spectrometry with tunable synchrotron photoionization. The flame temperature profiles were measured with a Pt-6%Rh/Pt-30%Rh thermocouple. The mole fraction profiles of major and intermediate flame species under different ethanol ratios were analyzed in this article. Experimental results showed that the temperature profiles of measured flames fall almost on a single curve, which means that ethanol had little effect on flame temperature. The peak mole fraction of the main combustion products occurred 2–6 mm above the burner. With the increase of ethanol blending ratios, the mole fractions of H2, CO, and CO2 decreased, the mole fraction of H2O increased, and the mole fractions of intermediate combustion products (C2H2, C2H4, HCHO, C3H3) decreased. During the combustion process, the oxygen atom of ethanol partly replaces the O2, thus the final mole fraction of O2 increased with the increase of ethanol ratios.
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ENZYME AND MICROBIAL TECHNOLOGY
·
2014
·
IF 2.966
Chuan-Yang Shang,Wei-Xun Li,Rui-Feng Zhang
ZnO nanowires were successfully introduced into a macroporous SiO 2 by in situ hydrothermal growth in 3D pores. The obtained composites were characterized by SEM and XRD, and used as supports to immobilize Candida antarctica lipase B (CALB) through adsorption. The high specific surface area (233 m 2 /g) and strong electrostatic interaction resulted that the average loading amount of the composite supports (196.8 mg/g) was 3–4 times of that of macroporous SiO 2 and approximate to that of a silica-based mesoporous material. Both adsorption capacity and the activity of the CALB immobilized on the composite supports almost kept unchanged as the samples were soaked in buffer solution for 48 h. The chiral resolution of 2-octanol was catalyzed by immobilized CALB. A maximum molar conversion of 49.1% was achieved with 99% enantiomeric excess of ( R )-2-octanol acetate under the optimal condition: a reaction using 1.0 mol/L ( R , S )-2-octanol, 2.0 mol/L vinyl acetate and 4.0 wt.% water content at 60 °C for 8 h. After fifteen recycles the immobilized lipase could retain 96.9% of relative activity and 93.8% of relative enantioselectivity .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2015
·
IF 2.587
Xiao-dong Tang,Yong-fen Zhang,Jing-jing Li,Yuan-qiang Zhu,Da-yong Qing,Ya-xin Deng
Deep eutectic solvents (DESs), which were prepared by using AlCl3, chlorinated paraffins-52, and various aromatics, show excellent desulfurization performance to various thiophenic sulfur compounds. In DESs, aromatic compounds strongly influence the desulfurization performance, and the order is toluene > p-xylene > o-xylene > ethylbenzene > benzene > chlorobenzene. The DESs containing toluene (DES-T) can deeply remove the three thiophenic sulfur compounds, that is, 3-methylthiophene, benzothiophene, and dibenzothiophene, within 10 min at 293 K. The extractive desulfurization mechanism is considered to be a π–π interaction of the aromatic ring along with the acid–base complexation. Satisfactorily, the extractive desulfurization is still effective for real oils, and real oil quality is improved in this process.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2014
·
IF 2.045
Zhuqiang Yang,Qincheng Bi,Yong Guo,Zhaohui Liu,Jianguo Yan,Qiang Zhang
The densities of endothermic hydrocarbon fuel at supercritical pressure condition are measured online using a radial measurement method. The densitometer is based on the attenuation theory of gamma ray using a count rate mode. One advantage of the method is that it is noninstrusive and practical for a small tube measurement. The densitometer was measurably optimized for the design and calibrated by the reference fluids with different density ranges. A kind of endothermic hydrocarbon fuel was measured covering the temperature from (283 to 950) K at the supercritical pressures of (3.0 and 4.0) MPa. The data were regressed with polynomial equations and the isobaric thermal expansion could be obtained by the fitted density curve.
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GREEN CHEMISTRY
·
2015
·Vol. 18
·期 1
·157-164
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IF 8.02
Mohammad Chand Ali,Qiwei Yang,Andrew Aaron Fine,Wenbin Jin,Zhiguo Zhang,Huabin Xing,Qilong Ren
The removal of nitrogen compounds (N-compounds) from fuels has attracted considerable attention because of the necessity to reduce nitrogen oxide emission and improve sulfur elimination. In this work, we reported a novel denitrogenation method of fuels using deep eutectic solvents (DESs) as extractants, and demonstrated the essential role of a rational control of the physicochemical character of DESs in achieving superior denitrogenation performance. Among the investigated DESs, the 1 : 2 molar mixture of choline chloride and phenylacetic acid presented the best denitrogenation performance, showing simultaneous efficient removal of both basic and non-basic N-compounds. Without chemical reactions, the extraction efficiencies of pyridine and carbazole at 308 K with a 1 : 1 DES : oil mass ratio were 99.2% and 98.2%, respectively, and the selectivities to n-heptane were higher than 10 000. This was better than the performance of compared conventional solvents. The extraction efficiency was not sensitive to the DES : oil mass ratio and temperature, and remained unchanged after four regeneration cycles. In addition to the “green solvents” character of DESs, these results collectively demonstrate the considerable potential of DESs as promising materials for the green and efficient denitrogenation of fuels.
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ANALYST
·
2015
·Vol. 140
·期 9
·3107-3112
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IF 4.107
Ye-Yu Wu,Cheng-Xiong Yang,Xiu-Ping Yan
The unique properties of metal–organic frameworks, such as diversity in structures and pore sizes, high surface area, shape selectivity and available to functionality make them as potential materials of the stationary phase for gas chromatography. Here we show an in situ growth approach to the fabrication of zeolite imidazolate framework-90 (ZIF-90) bonded capillary column for gas chromatography separation. ZIF-90 was directly grown onto the inner wall of the carboxyl modified capillary via the coordination between Zn(II) and carboxyl group. The fabricated ZIF-90 bonded capillary column acted as a weak polar stationary phase. It not only exhibits high capacity in the separation of linear molecules, but also offers excellent features for the separation of 2- and 3-substituted ketones.
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JOURNAL OF POROUS MATERIALS
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2017
·Vol. 25
·期 2
·373-382
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IF 1.624
Wang Liang,Li Zhu,Jing Qiangshan,Liu Peng
The aim of this paper is to synthesis a new type of insulation material (EPA), which fill the aerogels into the expanded perlite (EP). EP is a kind of lightweight filler, its application is constrained by the character of absorbing water easily. The silicic acid is inhaled into the expanded perlite at −0.1 MPa, aging 24 h, it becomes aerogel after solvent exchanging/surface modifying and drying. The pores of EP are filled with aerogel which affects thermal conductivity of expanded perlite little and makes it hydrophobic. EPA has a wider use than EP for its hydrophobic character. A new recipe to synthesize aerogel, filled into EP, with the thermal conductivity of 0.034 W/m K in ambient pressure drying is found in this experiment. The time and reagents dosage for synthesizing EPA are less than large block of aerogel, while the thermal conductivity is close to it. The scanning electron microscopy is used to analyze EPA’s micro structure. The thermal conductivity tester is used for testing the thermal conductivity of silica aerogel, expanded perlite and EPA.
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Journal of Physical Chemistry C
·
2017
·
IF 4.536
Yong Xiong,Tiantian Cao,Qian Chen,Zhen Li,Yue Yang,Shengming Xu,Shiling Yuan,Johan Sjöblom,Zhenghe Xu
Molecular dynamics simulation was used to investigate the adsorption of a polyaromatic compound (C5Pe) on silica surfaces from organic solvents. Heptane and toluene were used as oil phase to probe the effect of solvent properties on C5Pe adsorption. The results showed that C5Pe molecules tend to adsorb rapidly on silica surface in heptane and assemble to form long strip shaped aggregates, while in toluene C5Pe prefers to form aggregates which remain mostly in bulk oil phase. The van der Waals interactions were found to provide the largest contribution for driving the adsorption of C5Pe from heptane solutions due to the protonated state of C5Pe molecules. The calculated lower system free energy of C5Pe adsorption from heptane than from toluene corresponded well with the observed stronger adsorption of C5Pe from heptane than from toluene. AFM imaging confirmed the observed trend of C5Pe adsorption on silica from heptane and toluene.
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