JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Can Cheng,Jianjun Li,Jinyan Cao,Jiaxiu Guo,Wanglai Cen
The absorption properties of N-(2-hydroxyethyl) morpholine (HEM), morpholine (MP) and N-(2-aminoethyl) morpholine (AEM) for SO 2 were studied using sulfolane (SUL) as solvent in this work. Among these solvent combinations, HEM/SUL shows the best cyclic absorption performance, and the capacity of HEM-SUL-40 (40 wt% of HEM and 60 wt% of SUL) to absorb 8580 mg/m 3 SO 2 (the remainder is N 2 ) is 192.18 mg/g at 293.15 K. The absorption capacity of the second cycle is 97.5% of the first absorption cycle, which is higher than 70% of the Cansolv amine solution in a commercial application with similar experimental conditions. However, MP/SUL is difficult to desorb at high temperature, and the absorption capacity of AEM/SUL is much lower than HEM/SUL and MP/SUL. According to the FTIR , 1 H NMR and 13 C NMR, all three cyclic amines have charge transfer effects with SO 2 . The structure of HEM/SUL can be recovered after heating, but MP cannot be recovered. Δ r G m ° in the reaction against HEM with SO 2 increases significantly with increasing temperature. The Δ r G m ° of HEM-SO 2 and MP-SO 2 at 353.15 K is −12.56 kJ/mol and −16.29 kJ/mol, respectively, which further explains the easy desorption of HEM-SO 2 and the difficult desorption of MP-SO 2 at high temperature.
研究领域:
化学工程
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环境科学
·
物理化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qiu Zhao,Hui Zhao,Gang Wang,Hanwen Yan,Junping Zhang,Xinyue Liu,Yijun Cao
Synthesis of methylacrolein (MAL) from formaldehyde and propanal via Mannich reaction receives significant attention considering the gradual depletion of petroleum resource. Herein, series of morpholine/acid catalyst with different acid type and molar ratio were prepared to catalyze the propanal-formaldehyde reactions for MAL production. The catalytic performance of morpholine/acid was significantly affected by the morpholine/acid ratio, acid type, and initial pH value of reactant mixture. While the addition sequence of reactants and formaldehyde source would influence the yield and selectivity of MAL. As a result, the propanal conversion and MAL yield could reach 99.8 % and 89.7 % with catalysis of morpholine/acetic acid having the molar ratio of 1/3 under weak acidic environment (pH = 5.30) at 50 °C. It was revealed that the protonation of morpholine under weak acidic environment could effectively inhibit the deactivation of morpholine/acetic acid catalyst and promote the production of MAL, however, both basic and strong acidic environment would suppress the formation of MAL. Mechanistic DFT calculations also indicated the protonated morpholine species could not only interact with formaldehyde in the form of morpholine but also act as proton donor. The kinetic studies showed that the formation rate of MAL was first-order dependent on the concentrations of both propanal and formaldehyde with the activation barrier of 30.1 kJ/mol. Undesirably, the optimal morpholine/acetic acid catalyst would be gradually deactivated due to the side reactions of morpholine with formaldehyde, propanal and MAL.
研究领域:
化学工程
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催化化学
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Yahui Li,Daoguang Wang,Junfeng Wang,Yi Nie
Efficient separation of organic compounds from the high salinity brines during the treatment of reverse osmosis concentrate (ROC) is highly desirable and also very challengeable for the purpose of zero liquid discharge (ZLD). For the general treatment process, the efficient removal of organic compounds from the NaCl rich solution before the evaporation-crystallization stage is one of the key challenges. In this work, separation of N-(2-hydroxypropyl)morpholine (NMH), 4-morpholineacetate (MHA), the major organic components of ROC in refinery, and monovalent/divalent ions from the high salinity brines by three commercial nanofiltration (NF) membranes, i.e. Desal-5DK, Desal-5DL and NF270 were systematically investigated. The effects of various parameters on the rejection performance of these three NF membranes were experimentally investigated. The results showed that the retentions of NMH and MHA were dominated by flux and pH. Single stage filtration experiments showed that the rejection to NMH and MHA with various operating parameters was high and stable for DK. In comparison, DL and NF270 had higher separation efficiency for monovalent and divalent ions . The experiments determined that the rejections of NMH and MHA were 99.16% and 98.42% under the optimized conditions, respectively, indicating that NF membranes were highly efficient for separating organic compounds from the high salinity brine.
研究领域:
环境工程
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水处理
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膜技术
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 41
·e52994
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IF 3.057
Jing Ni,Hongchao Niu,Shiqing Lai,Chanjuan Liu,Li Zhou,Lichun Wang,Xiaohua Huang
Through one-step copolymerization of 4-(4-[1-morpholinyl]phenyl)-2,6-bis(4-aminophenyl)pyridine (MPAP), 9,9-bis(4-aminophenyl)fluorene (BAFL), and (4,4′-hexafluoroisopropylidene)diphthalic anhydride (6FDA), a series of polyimides containing morpholine group, pyridine ring, fluorene “cardo” pendant and hexafluoroisopropyl group are obtained. The synthesized polyimides have good thermal stability, high transparency, outstanding hydrophobicity and excellent solubility in not only high-boiling solvents but also low boiling-point solvents. Furthermore, polyimide films have large molecular chain spacing, which is consistent with the free volume calculated by molecular simulation. Consequently, polyimide membranes display better gas permeability values of CO 2 (up to 24.47 Barrer) and He (up to 45.04 Barrer), and good ideal gas selectivity values of CO 2 /N 2 (up to 15.33 Barrer) and He/N 2 (up to 23.89 Barrer), which also shows potential application of polyimide matrix materials in gas separation.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Journal of Physical Chemistry C
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2011
·
IF 4.524
Min Xie,Guichi Zhu,Yongjun Hu,Huaimin Gu
Morpholine is a typical six-membered saturated heterocycle with the molecular formula HN(CH2CH2)2O. In this work, the conformations of Morpholine in liquid and adsorbed on the surface of gold nanoparticles were studied by means of Raman spectroscopy and theoretical calculations. Ab initio calculations indicate that the energy of the chair conformers of Morpholine is ca. 7.5 kcal/mol lower than the skew-boat conformers, which implies that the chair conformers would be favorable in liquid Morpholine. Comparison of the observed Raman spectra of liquid Morpholine, its solution, and the predicted spectra of the chair conformers (equatorial and axial) revealed that both of the chair conformers coexist in its liquid, and the content of the equatorial-chair conformer may reduce in the solution. Considering the concentration-dependent Surface-Enhanced Raman Scattering (SERS) spectral profile, the surface selection rule, and the theoretical calculations, it has been inferred that at higher concentrations Morpholine is vertically chemisorbed on gold nanoparticles through the N atom of the ring, and the dominant conformation adsorbed is the axial-chair conformer. However, at the dilute concentrations, Morpholine is gradually flatly chemisorbed on the gold nanoparticles through the N atom, and the Morpholine may be deprotonated. Furthermore, the predicted spectra agree with the experimental ones very well, which confirms the results above.
研究领域:
物理化学
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材料科学
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光谱学
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产品关联
DOI
高影响因子
Journal of Analytical Methods in Chemistry
·
2018
·
IF 1.262
Mengsi Cao,Pingping Zhang,Yanru Feng,Huayin Zhang,Huaijiao Zhu,Kaoqi Lian,Weijun Kang
A reliable derivatization method has been developed to detect and quantify morpholine in apple juices and ibuprofen with gas chromatography-mass spectrometry. Morpholine can react with sodium nitrite under acidic condition to produce stable and volatile N-nitrosomorpholine derivative. In this experiment, various factors affecting the derivatization and extraction process were optimized, including volume and concentration of hydrochloric acid, quantity of sodium nitrite, derivatization temperature, derivatization time, extraction reagents, and extraction time. The derivative was extracted with dichloromethane and determined by gas chromatography-mass spectrometry. The linearity range of morpholine was 10–500 g·L−1 with good correlation, and limits of detection (LOD) and limits of quantification (LOQ) were 7.3 g·L−1 and 24.4 g·L−1, respectively. Low, medium, and high concentrations of morpholine were added in apple juices and ibuprofen samples to evaluate standard recovery rate and relative standard deviation. The spiked recovery rate ranged from 94.3% to 109.0%, and the intraday repeatability and interday reproducibility were 2.0%–4.4% and 3.3%–7.0%, respectively. The developed method has good accuracy and precision. This quantitative method for morpholine is simple, sensitive, rapid, and low cost and can successfully be applied to analyze the residual morpholine in apple juices and drug samples.
研究领域:
分析化学
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食品科学
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药物分析
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2013
·
IF 2.206
Yan Liu,Zhenhu Cao,Yan Zhang,Zhengping Fang
Cerium N-morpholinomethylphosphonic acid (MMPA-Ce) with fibrous structure was synthesized via hydrothermal reaction between cerium nitrate hexahydrate and N-morpholinomethylphosphonic acid. The thermal stability and flame retardancy of high density polyethylene (HDPE) containing various amounts of MMPA-Ce was investigated by thermal gravimetric analysis and cone calorimeter. It is found that even at low addition of MMPA-Ce into HDPE could increase the thermal stability of HDPE. The results of cone calorimeter showed that the emission of CO decreased while the emission of CO2 increased instead.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENVIRONMENTAL ANALYTICAL CHEMISTRY
·
2022
·
IF 2.731
Tao Ma,Yiyun Li,Changchun Yuan,Zhichun Li,Wenbing Ma,Ling Ma
As a vital biological molecule, H2O2(Hydrogen Peroxide) is involved in different physiological and pathological processes. And in addition to this, H2O2 is suitable for medical wound disinfection, environmental disinfection and food disinfection. Accordingly, it is of high significance to conveniently and effectively detect H2O2 in the environment and organisms. This subject synthesised a fluorescent probe Pyrimidine-Se by using selenomorpholine and pyrimidine dye, which detect H2O2 in an aqueous environment. Pyrimidine-Se has a large Stokes shift (Δλ = 155 nm), which can specifically and quickly quantitatively detect H2O2. When the probe Pyrimidine-Se reacted with H2O2, the Se(II) in the selenomorpholine was oxidised to Se(IV), so the electron withdrawing ability of the electron withdrawing group of Pyrimidine-Se was improved, and the fluorescence intensity of the probe were enhanced. Interestingly, Se(IV) can be reduced by GSH (Glutathione) to Se(II) to quench the fluorescence, and this redox cycle can continue several times, which indicated that it can have a potential of real-time monitoring the redox state in vivo. The probe was also satisfactorily used to detect H2O2 in Argentina Bloodfin larvaes and abnormal H2O2 content in some organs was detected.
研究领域:
生物化学
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医学检测
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 16
·2714-2721
·
IF 5.047
Chao Xu,Ying Qian
A simple selenamorpholine-based fluorescent probe has been designed and synthesized using a combination of selenamorpholine and a BODIPY fluorophore. BODIPY–Se has a low pKa value of 4.78 because of the selenamorpholine unit, which is beneficial for the probe to detect the lysosome. BODIPY–Se can turn on partial fluorescence only in lysosomes, due to a PET-inhibited process of protonation of selenamorpholine. In addition, the selenamorpholine unit of BODIPY–Se could selectively react with H2O2 through a redox reaction, leading to the alteration of the valence state of selenium from Se(II) to Se(IV) and an additional PET-inhibited process. When BODIPY–Se tracked H2O2 in lysosomes, the two PET-inhibited processes would obviously amplify the fluorescence signal in living cells and in vivo. The probe could also detect the redox cycles between H2O2 and GSH continuously. Using confocal fluorescence imaging, the fluorescence localization of lysosomes demonstrated that BODIPY–Se could successfully target lysosomes. The probe could not only detect exogenous/endogenous H2O2 in living cells, but could also realize real-time monitoring of H2O2 in cancer cells and zebrafish. The results proved that BODIPY–Se is a promising fluorescent probe in biological applications.
研究领域:
生物化学
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医学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2019
·Vol. 11
·期 2
·323
·
IF 3.164
Xiang Shen,Peng Liu,Shubiao Xia,Jianjun Liu,Rui Wang,Hua Zhao,Qiuju Liu,Jiao Xu,Fan Wang
Membrane fouling induced by the adsorption of organic matter, and adhesion and propagation of bacteria onto the surfaces, is the major obstacle for the wide application of membrane technology. In this work, the capsaicin-based copolymer (PMMA-PACMO-Capsaicin) was synthesized via radical copolymerization using methyl methacrylate (MMA),N-acrylomorpholine (ACMO) and 8-methyl-N-vanillyl-6-nonenamide (capsaicin) as monomers. Subsequently, the capsaicin-based copolymer was readily blended with PVDF to fabricate PVDF/PMMA-PACMO-Capsaicin flat sheet membrane via immersed phase inversion method. The effects of copolymer concentration on the structure and performance of resultant membranes were evaluated systematically. With increase of PMMA-PACMO-Capsaicin copolymer concentration in the casting solution, the sponge-like layer at the membrane cross-section transfers to macroviod, and the pore size and porosity of membranes increase remarkably. The adsorbed bovine serum albumin protein (BSA) amounts to PVDF/PMMA-PACMO-Capsaicin membranes decrease significantly because of the enhanced surface hydrophilicty. During the cycle filtration of pure water and BSA solution, the prepared PVDF/PMMA-PACMO-Capsaicin membranes have a higher flux recovery ratio (FFR) and lower irreversible membrane fouling ratio (Rir), as compared with pristine PVDF membrane. PVDF/PMMA-PACMO-Capsaicin membrane is found to suppress the growth and propagation ofStaphylococcus aureusbacteria, achieving an anti-bacterial efficiency of 88.5%. These results confirm that the anti-fouling and anti-bacterial properties of PVDF membrane are enhanced obviously by blending with the PMMA-PACMO-Capsaicin copolymer.Keywords:poly(vinylidene fluoride);biofouling;hydrophilicity;acrylomorpholine;capsaicin
研究领域:
材料科学
·
环境工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Xiaomin Qiu,Bingjie Huo,Qi Wang,Jingwei Yang,Zhaoyou Zhu,Yinglong Wang,Jun Gao
In this work, the effects of N-methyl pyrrolidone, N,N-dimethylformamide, cyclohexanol, butyl butyrate, and N-formylmorpholine on the separation efficiency of a p-xylene and 1-pentanol azeotropic system are investigated, and the best solvent is selected from these solvents. The vapor–liquid equilibrium data of binary systems of 1-pentanol + butyl butyrate, 1-pentanol + N-formylmorpholine, and p-xylene + butyl butyrate are measured using a modified Rose-type circulating still under 101.3 kPa. In order to check the thermodynamic consistency of the experimental vapor–liquid equilibrium data, the Herington and Van Ness methods are used. In addition, the nonrandom two-liquid, universal quasichemical, and Wilson models are used to correlate the experimental data of binary systems, and the interaction parameters of binary systems are obtained.
研究领域:
化学工程
·
热力学
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产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2012
·Vol. 18
·期 5
·315-319
·
IF 0
Feng Yakai,Chen Chengbin,Zhang Li,Tian Hong,Yuan Wenjie
A series of novel copolymers were successfully synthesized by ring-opening polymerization (ROP) of 3(S)-methyl-morpholine-2,5-dione (MMD) and 5-methyl-5-benzyloxycarbonyl-1,3-dioxan-2-one (MBC) using stannous octoate as catalyst. The copolymers were characterized by means of 1H-NMR and FT-IR spectroscopy. Gel permeation chromatography (GPC) test shows that the average-number relative molecular mass and average-weight relative molecular mass slightly increase with the increase of MBC content in feed. The results of differential scanning calorimetry (DSC) demonstrate that the glass transition temperature of copolymers increases with the increase of MBC content in copolymers. The copolymers of MMD and MBC are amorphous copolymers, as indicated by DSC results, while the homopolymer of MMD is semicrystalline.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）