JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
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IF 3.119
Zhen Jiao,Mengnan Zhang,Lixia Yang,Yuxuan Wang,Jiajie Fu
To evaluate the feasibility of extraction of 1-methylimidazole from its low-concentration aqueous solution by ionic liquids, the liquid–liquid equilibrium of the ternary system of water + 1-methylimidazole + ionic liquid ([Hmim][PF6], [Omim][PF6], or [Omim][BF4]) was determined at 303.15 K and atmospheric pressure. The distribution coefficient and selectivity were calculated in accordance with the experimental results. The effects of the anion and cation of ionic liquids on the separation ability were discussed. The results indicated that the extraction capacity increased with increasing cationic carbon chain length, and the change of anions significantly affected the distribution coefficient and selectivity. As expected, the three ionic liquids were feasible as extractants for separating 1-methylimidazole from water. It also indicated that [Omim][PF6] was a more suitable extractant than [Hmim][PF6] and [Omim][BF4] for the extraction. The highest distribution coefficient and selectivity of [Omim][PF6] could reach 1.71 and 111.92, respectively, indicating [Omim][PF6] as a good choice for extracting 1-methylimidazole from water. In addition, the non-random two-liquid model was employed to successfully correlate the experimental data with a root-mean-square deviation of less than 0.0188. Moreover, a GUI-MATLAB tool was used to verify the consistency of the correlated parameters.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CHEMICAL PAPERS
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2023
·Vol. 77
·期 10
·5873-5880
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IF 2.2
Zhou Jialin,Fei Jiayu,Zeng Cheng,Quan Hong Hua,Li Ming
Stably retaining the water-soluble molybdate within electrodes is of great significance in phosphate analysis. This study fabricated an [Omim] 6 Mo 7 O 24 carbon paste electrode (OCPE), which was able to effectively retain molybdate in the aqueous solution. The electrochemistry of phosphate at the surface of the OCPE was studied using cyclic voltammetry (CV). The voltammograms showed three reversible redox peaks corresponding to the redox of Mo(VI/V) as well as several irreversible peaks involving the formation of hydrogen molybdenum bronze. The currents of all three reversible redox peaks linearly varied versus phosphate concentrations in 0.1 mol·L −1 H 2 SO 4 -KCl. After optimizing the mass ratio of the [Omim] 6 Mo 7 O 24 and carbon powder, peak C6 shows a wide linear range (1.0 × 10 –2 –1.0 × 10 –7 mol·L −1 ; R 2 = 0.9970) with a sensitivity of 5.3 (± 0.1) μA/μM. The limit of detection (LOD = 3 σ /s) was 8.5 × 10 –8 mol·L −1 . Interferences from common anions, silicate, and glyphosate on phosphate analysis were also investigated. The proposed sensing method was successfully applied to the determination of phosphate in tap water, whose results were verified with ion chromatography (IC).
研究领域:
分析化学
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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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2018
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IF 6.735
Lingwan Hao,Lulu Sun,Ting Su,Dongmei Hao,Weiping Liao,Changliang Deng,Wanzhong Ren,Yanmei Zhang,Hongying Lü
In this study, a novel Polyoxometalate (POM)-based ionic liquid (IL), [3-(pyridine-1-ium-1-yl)propane-1-sulfonate] 3 (NH 4 ) 3 Mo 7 O 24 ·4H 2 O, abbreviated [PyPS] 3 (NH 4 ) 3 Mo 7 O 24 , was prepared and employed as a catalyst in the extraction and catalytic oxidative desulfurization (ECODS) of model and actual diesel . The catalyst was characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric and differential thermal analyses (TG-DTA) and X-ray photoelectron spectroscopy (XPS). The [PyPS] 3 (NH 4 ) 3 Mo 7 O 24 catalyst demonstrates unprecedented activity in oxidative desulfurization system that the removal of dibenzothiophene (DBT) could reach 99% under quite mild conditions ( T = 25 °C, n (catalyst) = 0.0056 mmol, t = 60 min, n (H 2 O 2 )/ n (sulfur) = 3, V IL /V Model Oil = 1/10). Moreover, the catalytic oxidative desulfurization system can work under the extreme reaction condition, i.e., the DBT removal could reach 99% even at 0 °C. Some important parameters which affect the ODS process, such as temperature, hydrogen peroxide dosage reaction systems and different sulfur compounds, were systematically studied. In addition, the catalyst exhibits remarkable selectivity to the catalytic oxidation sulfides compared with monocyclic or di-aromatics. And this desulfurization system could be recycled for five times without significant reducing the desulfurization. Furthermore, the deep catalytic oxidative desulfurization of actual diesel could also be achieved with this oxidative desulfurization system.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Kun Yue,Guowei Zhou
Isobaric vapor–liquid equilibrium data for the ternary system of ethyl acetate + ethanol + ionic liquids (ILs) were obtained at 101.3 kPa. The ILs used were 1,3-dimethylimidazolium dimethylphosphate ([MMIM][DMP]) and 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM][PF 6 ]). The vapor–liquid equilibrium data were correlated using the nonrandom two-liquid model, and the results were well fitted with the experimental data, showing that the minimum concentration (mole fraction) of [MMIM][DMP] and [OMIM][PF 6 ] to break the azeotrope of ethyl acetate + ethanol system was 0.048 and 0.141, respectively. [MMIM][DMP] brought about a monotonous “salting-out” effect on ethyl acetate, while [OMIM][PF 6 ] brought about a crossover effect containing “salting-in” and “salting-out” on ethyl acetate. Finally, polarity of solvents and ions dissociated by ILs was analyzed through the σ-profiles, indicating the mechanism of various separation results using these two ILs. It is suggested that [MMIM][DMP] and [OMIM][PF 6 ] can be used as good candidate entrainers in separating ethyl acetate and ethanol.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
JOURNAL OF ETHNOPHARMACOLOGY
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2024
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IF 4.8
Feifan Liu,Yuanmei Bai,Xue Wu,Yan Wan,Shifang Luo,Linao Zhang,Tao Li,Hua Tang,Xianjin Tang,Rong Chen,Qinghua Chen,Yuhuan Xie,Peixin Guo
Ethnopharmacological relevance Allergic rhinitis (AR) stands as a non-infectious inflammatory condition affecting the nasal mucosa, marked by bouts of sneezing, nasal itching, and congestion. This ailment afflicts individuals across all age groups and poses challenges for effective treatment due to its chronic nature. Cangerzisan (CEZS), documented in the Jishengfang compendium, represents a traditional Chinese medicinal formula long utilized for AR management. Aim of the study : Investigating mechanism beneath therapeutic effect of CEZS in alleviating AR. Materials and methods The main active components in CEZS were determined by High Performance Liquid Chromatography (HPLC).The active constituents of CEZS and their corresponding targets were identified through an exhaustive screening process employing TCMSP database. To identify targets relevant to AR, GeneCards, OMIM, and DisGeNET databases were thoroughly applied. Protein-protein interaction (PPI) network was assembled utilizing STRING platform. Potential signaling pathways influenced by CEZS were delineated through GO and KEGG enrichment analyses. Subsequently, an AR model was induced by administering aluminum hydroxide (Al(OH)3) and ovalbumin (OVA) for affecting basal and local sensitization, respectively, facilitating experimental validation of the principal signaling pathways. Results There were 61 active constituents identified within CEZS, targeting a pool of 129 entities associated with AR treatment. Pathways analysis of KEGG revealed that CEZS potentially inhibits AR advancement via modulating TLR4 signaling pathway. Animal experiments demonstrated that CEZS effectively alleviated symptom scores in guinea pigs with AR. Moreover, it exhibited notable improvements in serum immune and inflammatory factors levels, as well as reduced inflammatory infiltration within nasal mucosa, including goblet and mast cells. CEZS was found to enhance GATA-3 expression while reducing T-bet expression, thereby modulating the TH1/TH2 immune balance. Additionally, CEZS downregulated HMGB1, TLR4, and p–NF–κB/NF-κB protein expressions within nasal mucosa of guinea pigs. Conclusions The therapeutic mechanism of CEZS against AR involves rectifying TH1/TH2 immune imbalance and upregulating inflammatory and immune factors through modulating key proteins expression within TLR4 pathway. This targeted regulation effectively impedes AR progression.
研究领域:
民族药理学
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药理学
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免疫学
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传统中药
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生物信息学
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实验验证
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DOI
PubMed
高影响因子
CHROMATOGRAPHIA
·
2018
·Vol. 81
·期 4
·595-610
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IF 1.401
Liu Wei,Quan Ji
In this work, a quantitative structure–property relationship (QSPR) model based on atom-type electrotopological state (E-state) indices has been developed for predicting the dispersive liquid–liquid microextraction (DLLME) enrichment effect for aromatic organics by using 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIM][PF 6 ]) ionic liquid as extractant. The enrichment factors of the aromatic organics obtained through DLLME-IL process were used as the dependent variable of the multiple linear regression (MLR) equation. The E-state indices of those organic compounds which combined together both electronic and topological characteristics of the analyzed molecules were used as molecular structure descriptors and the independent variable of the equation. The squared correlation coefficient R 2 for the MLR was 0.992 for the training set of 33 compounds. For the test set of 8 compounds, the linear regression coefficient was R 2 = 0.985. The results of this study showed that it can successfully predict enrichment factors of [OMIM][PF 6 ] in DLLME by using atom-type E-state indices, which can provide one more way for predicting the ability of ionic liquid to extract organic compounds based on their molecular structures.
研究领域:
分析化学
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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）