Molecular Catalysis
·
2020
·
IF 3.687
Hongbing Song,Yule Liu,Yongjie Wang,Bingxiao Feng,Xin Jin,Tingting Huang,Meng Xiao,Hengjun Gai
In this study, a series of hypercrosslinked poly(ionic liquid)s (HCPILs) formed from imidazolium tetrachloropalladate were successfully fabricated for selective hydrogenation of phenylacetylene. Its textural properties can be tuned by the different molar ratios of reactants, thereby adjusting its active sites. The synthetic HCPILs were analyzed using various characterization techniques. Due to the constraint of the microporous structure and the charge effect of ionic liquid moieties in the HCPILs, palladium nanoparticles generated from HCPILs were reduced in situ during hydrogenation of phenylacetylene and highly dispersed. Amongst which catalyst a-4 with the largest pore-volume performed the best selectivity (97.3 %) to styrene at 96 % phenylacetylene conversion under the conditions of 308 K and 1 atm H 2 pressure. Furthermore, the activity and selectivity of the catalyst did not change considerably in solvents with different polarities. Even after repeated the catalytic experiments for five times, the catalyst displayed no significant loss for activity and selectivity. This work shows industrial application potential and a developing direction in the selective hydrogenation process.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Zhentao Li,Zhenkun Mao,Changjun Hu,Qiaoyan Li,Zilin Chen
Fluorous affinity means remarkably specific interaction between highly organic fluorides. This work aims to explore the potential of fluoro-functionalized stationary phase for the separation of organic fluorides by means of fluorous-fluorous interaction. Here, by using the Michael addition strategy between 1H,1H,2H,2H-perfluorodecanethiol (PFDT) and polydopamine (PD), a novel fluoro-functionalized stationary phase was synthesized for open-tubular capillary electrochromatography (OT-CEC). The PFDT@PD was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray Photoelectron Spectrometer (XPS). The PFDT@PD@capillary exhibited outstanding separation performance towards neutral compounds (such as alkylbenzenes and chlorobenzenes) and organic fluorides (such as fluorobenzenes and perfluoroalkyl methacrylates etc.) with high resolution and high separation efficiency by hydrophobic interaction and fluorous-fluorous interaction. In addition, the column shows good stability and reproducibility. The relative standard deviations (RSDs) of the retention time for intra-day (n = 5) and inter-day (n = 3) runs and between columns (n = 3) are less than 0.39%, 1.22% and 3.87%, respectively. This novel type of fluoro-functionalized stationary phase represents a great application potential in organic fluorides separation field.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Gaoyi Yi,Jingxia He,Baian Ji,Die Gao,Kailian Zhang,Lujun Wang,Jing Zeng,Zhining Xia,Qifeng Fu
In recent years, mussel-inspired polydopamine (PDA) based materials have been widely used as stationary phases for open-tubular capillary electrochromatography (OT-CEC) because of their various excellent properties. Nevertheless, the traditional synthesis routes of functionalized PDA-based capillary columns usually are time-consuming and limited in aqueous solutions. Herein, we report a facile and rapid route to prepare octadecylamine (ODA) functionalized PDA coated OT-CEC columns in organic solvents via a novel one-step in situ solvothermal-assisted coating strategy. Through this developed solvothermal-assisted approach, the growth rate of ODA/PDA coating was significantly speeded up and their hybrid coating process on the capillary inner surface could be rapidly completed in 60 min. The successful preparation of the solvothermal-assisted ODA/PDA hybrid coating were systematically characterized and confirmed by several methods. The influence of the preparation parameters on the formation of hybrid coating and the separation ability of the ODA/PDA modified columns were systematically explored. Consequently, the high-efficiency baseline separation of four kinds of neutral, acidic and basic analytes were achieved based on the ODA/PDA modified columns. The repeatability of the solvothermal-assisted ODA/PDA coated column was also studied, and the relative standard deviations for intra-day, inter-day and column-to-column were all less than 5%. Additionally, the solvothermal-assisted ODA/PDA modified column exhibited good stability and long lifetime.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Shenling Wang,Yanling Geng,Xiaowei Sun,Rongyu Wang,Zhenjia Zheng,Shenghuai Hou,Xiao Wang,Wenhua Ji
In this work, a single cross-linking functional monomer, 2,5-divinylterephthalaldehyde, was designed and synthesized to simplify the preparation of molecularly imprinted polymers (MIPs). In the presence of estradiol as a template, MIPs were successfully prepared using 2,5-divinylterephthalaldehyde along with a solvent and initiator. This method reduced most of the complex variables encountered in the traditional synthesis. Characterization of the morphology and structure of the MIPs was performed by scanning electron microscopy, Fourier transform infrared spectroscopy, and Brunauer-Emmett-Teller analysis. Compared with non-imprinted polymers, the MIPs had higher adsorption capacities for five estrogens with imprinting factors above 2.9. The MIPs had high extraction efficiencies, good functional properties, long lifetimes, and good reproducibility, which made them suitable for solid-phase microextraction (SPME). Coupled with ultra-high performance liquid chromatography tandem mass spectrometry, the MIP-based fibers were applied to SPME for the analysis of five estrogens in milk samples. Under the best conditions, the established method had a wide linear range (0.5–10000 ng kg −1 ), low limits of detection (0.08–0.26 ng kg −1 ) and quantification (0.26–0.87 ng kg −1 ), good precision (3.2–8.1%, n = 6), and fiber-to-fiber reproducibility (4.3%–8.8%, n = 3). The MIPs-based fibers can be reused at least 60 times without apparent loss of extraction efficiency. Finally, this method was applied to the determination of target estrogens in milk samples with satisfactory relative recoveries (84.3%–105%, relative standard deviation ≤ 7.8%).
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yanhui Zhong,Zhaoxia Shi,Taoxiao Wen,Xiaohua Xiao,Gongke Li,Yufei Hu
In this work, a novel cataluminescence(CTL) strategy was developed for fast differentiation of sunscreen cosmetics. The CTL reactions occurring on the surface of sunscreen cosmetics whose characteristic composition served as catalyst. Normalization methodology was utilized to process sensor array signals, we developed a dimensionless quantity called “relative signal ( S kr )” to characterize the sensor response. Firstly, aldehydes are eligible for triggering CTL reactions on the surface of TiO 2 , so they served as probe in the CTL sensor. Then, with four aldehydes as sensor elements, the obtained four S kr of a catalytic material constitute as digital code for rapid screening of nanomaterials. Further, the CTL S kr of different brands and colors of sunscreen cosmetics were obtained. The CTL S kr functioned as digital code which can be used to distinguish sunscreen cosmetics. Intersecting, the CTL signals of the array could be applied to normalize, and identify sunscreen cosmetics of different brands and colors through linear discrimination analysis (LDA). It provides a rapid and convenience platform for distinguishing sunscreen cosmetics, and avoid cumbersome sample preparation. The strategy is a new idea for rapid distinguishing the complex samples based on its special ingredient.
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2019
·Vol. 22
·期 3
·742-752
·
IF 9.405
Xiwei Hu,Xun Sun,Qiang Song,Yangyang Zhu,Yu Long,Zhengping Dong
Metal-free carbon catalysts with excellent catalytic performance have drawn much research attention recently. Herein, polymer-derived N,S co-doped carbon catalysts (PDNSC-X) with a hierarchically porous structure were facilely prepared by a cost-effective and convenient strategy via carbonization of a N- and S atom-containing polymer precursor and were subsequently used as efficient metal-free catalysts. The catalytic activity of the as-fabricated PDNSC-800 was greater than those of other reported heteroatom-doped carbon catalysts in catalytic reduction of various nitroarenes. The high catalytic activity of PDNSC-800 was related to the synergistic effects of a high surface area, a hierarchically porous structure, abundant N- and S-containing active sites, and defect formation. In addition, the close relationship between the N species (especially pyrrolic N) and high selectivity in metal-free catalytic synthesis was investigated in the reduction of nitroarenes and selective oxidation of ethylbenzene. This study may provide a new strategy to fabricate specific heteroatom-doped metal-free carbon catalysts for environmentally friendly efficient organic transformation.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2019
·
IF 3.858
Zhihua Song,Shenghong Li,Yafeng Guan,Shuo Wang,Yinghao Wang,Gangqiang Yang,Xiaochen Zhang,Jinhua Li,Wenhao Song,Chuanming Zhou,Lingxin Chen
In this work, multilayer zirconia-coated silica (ZrO 2 /SiO 2 -n) microspheres were successfully produced by a straightforward hydrothermal procedure with a low concentration of Zr 4+ (5 mM) under low potential of hydrogen (pH) conditions (pH = =2). The obtained ZrO 2 /SiO 2 -n materials exhibited favorable characteristics for high-performance liquid chromatography (HPLC) separation, including high surface area and pore volume, good pore structure, narrow particle size, and pore size distribution. In addition, the zirconia coverage in the mesopores was confirmed by soaking the material in 1 M NaOH solution, with the particles showing strong resistance to the basic solution. The obtained ZrO 2 /SiO 2 -n stationary phases were packed into a fused-silica capillary tubing for the separation of alkaloids in hydrophilic interaction chromatography (HILIC) mode, and a column efficiency of 47,800 plates/m was obtained for berberine on a ZrO 2 /SiO 2 -6 micro column. The ZrO 2 /SiO 2 -6 microspheres were further modified by dodecylphosphonic acid (C 12 P-2-ZrO 2 /SiO 2 -6); the C 12 P-2-ZrO 2 /SiO 2 -6 material showed great potential for application in reversed-phase liquid chromatography (RPLC) mode. The C 12 P-2-ZrO 2 /SiO 2 -6 micro column showed a column efficiency of 55,000 plates/m for naphthalene and 51,300 plates/m for benzene.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BUILDING AND ENVIRONMENT
·
2019
·
IF 4.82
Shen Yang,Xudong Yang,Dusan Licina
People spend a substantial amount of daily time in vehicle environments being exposed to variety of airborne chemicals. High concentrations of volatile organic compounds (VOCs) inside vehicle cabins have been of increasing concern owing to various health risks. Yet, there is a limited knowledge and data about VOC emissions from interior vehicular materials. In a controlled small-scale ventilated chamber, we quantified dynamic VOC emission characteristics for four commonly-used vehicular interior materials (leather coat of seats (LCS), dashboard (DB), pillar (PI) and ceiling (CE)) exposed to the two interior air temperatures (25 and 60 °C). The emission strengths of VOCs increased with temperature elevation by 3–36 times, but not linearly for every group of compounds. The level of individual VOC compounds emitted was a strong function of time, indicating the importance of a continuous sampling approach. Correlation analysis of individual VOCs revealed different emission mechanisms among the major compounds. The source apportionment results indicated that the LCS materials were associated with emissions of aromatics, carbonyls and other VOCs at 25 °C, while special attentions should be paid to the DB and the PI for their predominant contributions to extremely elevated level of aliphatic compounds at 60 °C. The results of this study are potentially useful for database of VOC emissions from vehicular materials, development of improved standard testing methods and for improved modeling of VOC emissions.
✓ 已验证
产品关联
DOI
高影响因子
SN Applied Sciences
·
2019
·Vol. 2
·期 1
·1-11
·
IF 0
Li Genrong,Yu Wenqin,Xiao Zhaojing,Long Mei,Tong Lanyan,Qiu Yue
A rapid, sensitive, and practical QuEChERS method coupled with gas chromatography–mass spectrometry was developed for the simultaneous determination of 16 chemical adjuvant residues in samples of fruits (apple, nectarine, grape) and vegetables (tomato, cucumber, spinach). All target compounds were separated in less than 16 min. Samples were extracted with acetonitrile, and the types of extraction salt and cleanup sorbent were optimized. The optimized method was validated by evaluating the linearity, accuracy, precision, and matrix effect. The recoveries of the 16 pesticides adjuvants ranged from 61.2 to 116.3% with relative standard deviations lower than 11.6%. Limits of detection ranged from 0.21 to 3.02 μg/kg, and limits of quantification ranged from 0.71 to 10.07 μg/kg. Finally, the developed method was successfully employed to identify and quantify pesticide adjuvant residues in the analysis of 30 real fruit and vegetable samples.
✓ 已验证
产品关联
DOI
Separation Science Plus
·
2019
·Vol. 2
·期 12
·432-439
·
IF 0
Yu-Yu He,Qing Pu,Jun-Hui Zhang,Sheng-Ming Xie,Xue-Xian Chen,Li-Ming Yuan
Mesoporous materials are promising functional materials due to their properties, such as a large surface area, tunable pore size, structure and morphology. Chiral mesoporous silica is an indispensable part of mesoporous materials. Considering that chirality is rare in inorganic mesoporous materials, there are very few reports on chiral inorganic mesoporous silica for chromatographic separations. In this work, we report the use of chiral inorganic mesoporous silica based on the template of myristyl chloride- l -valine sodium as the stationary phase for enantioselective separation in gas chromatography. Thirteen chiral compounds were resolved on a fabricated column using dynamic coating, including chiral alcohols, epoxides and amino acid derivatives. In addition, n -alkanes, n -alcohols and aromatic hydrocarbons have also been separated.
✓ 已验证
产品关联
DOI
CHIRALITY
·
2019
·Vol. 31
·期 12
·1053-1059
·
IF 1.927
Yu-Yu He,Jun-Hui Zhang,Qing Pu,Sheng-Ming Xie,Yan-Xia Li,Lan Luo,Xue-Xian Chen,Li-Ming Yuan
Chiral mesoporous silica (CMS) has attracted widespread attention because of some unique properties, such as high surface area, uniformly structured nanoscale cavities, and excellent chemical and thermal stability. In this work, we report the utilization of a CMS as the stationary phase for the separation of racemates in gas chromatography (GC). A CMS-coated capillary column was fabricated by a dynamic coating method. Eighteen racemates belonging to different classes of organic compounds were separated on this column, including chiral alcohols, aldehydes, ketones, organic acids, halohydrocarbons, alkenes, alcohol amines, epoxides, and amino acid derivatives. In addition, linear alkanes, alcohols, and aromatic hydrocarbons have also been resolved.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 44
·17306-17314
·
IF 3.069
An Pei,Luna Ruan,Jianhua Liao,Huan Zhang,Jiexiang Wang,Kai Yang,Zhiping Liu,Lihua Zhu,Bing Hui Chen
Herein, Ni/C was prepared at room temperature (RT) by liquid chemical reduction by using hydrazine hydrate as the reducing agent. The impregnation method was adopted to deposit precious metals on carbon black (C) to obtain the Pd/C, Ru/C monometallic and PdRu/C bimetallic catalysts. The PdNi/C, RuNi/C bimetallic and PdRuNi/C tri-metallic catalysts were obtained through a chemical replacement reaction method. The as-prepared catalysts were characterized by inductively coupled plasma mass spectrometry (ICP-MS), X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution TEM (HRTEM), high-angle annular dark-field scanning TEM (HAADF-STEM) and STEM energy dispersive X-ray spectroscopy (STEM-EDS) elemental mapping and line-scanning, scanning electron microscopy (SEM) and SEM-EDS, X-ray photoelectron spectroscopy (XPS) and high-sensitivity low-energy ion scattering spectroscopy (HS-LEIS) techniques, which proved that PdRu islands were supported on the Ni/Ni(OH)2 nanoparticles (NPs) (PdRu-on-Ni/Ni(OH)2 NPs) in PdRuNi/C. The results revealed that the PdRuNi/C catalyst showed the most excellent catalytic performance for ethylbenzene hydrogenation under mild reaction conditions mainly owing to the synergistic effect among the Pd, Ru and Ni related species. The PdRuNi/C catalyst also exhibited good stability in ethylbenzene hydrogenation.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）