CATALYSIS COMMUNICATIONS
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2020
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IF 3.612
Pengbo Wang,Qian He,Hao Zhang,Qingdi Sun,Yujie Cheng,Tao Gan,Xiaohui He,Hongbing Ji
Several research studies have been conducted on N -formylation of amines using phenylsilane and CO 2 . However, most of these studies involved tedious processes of catalyst preparation or complex procedures. In the present study, we describe the use of a simple and commercially available ZnO catalyst for selective N -formylation of amines under mild condition. High-yielding N -formylation products with good recyclability and wide substrate scope were obtained, which can promote fine chemical synthesis and CO 2 capture.
研究领域:
有机化学
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催化化学
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绿色化学
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产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 10
·e17775
·
IF 4.167
Bo Hao,Wenbo Zhao,Xiangxin Tong,Shaoyun Shan,Yuan Chen
The high viscosity of ionic liquids (ILs) limits their practical application in SO 2 capture. In this work, the low viscous aminoalkyl-phenyl-silanes were synthesized to capture SO 2 . The π – π interaction between phenyl groups reduced the volatility of aminoalkyl-phenyl-silanes greatly, but it did not increase their viscosity significantly. Among them, N-[(dimethylphenylsilyl)methyl]-N-methylbenzenemethanamine (DPSA) containing two phenyl groups exhibited the strongest π – π interaction. Therefore, the thermal decomposition temperature reached 150°C, while its viscosity was only 8.45 mPa·s at 25°C, which is much lower than that of ILs. The absorption enthalpy and entropy change of DPSA absorption reaction were −79.284 kJ/mol and −224 J/mol/K, respectively. These values are more negative than those of SO 2 capture reaction with ILs. An objective function was proposed to obtain the optimal absorption and desorption temperature. Furthermore, five cycles of regeneration experiments indicated that DPSA possessed good regeneration ability.
研究领域:
化学工程
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环境科学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2024
·Vol. 42
·期 2
·70-80
·
IF 1.3
Yanling Yu,Biwu Huang,Yafen Qu,Junshan Qiu,Yong Lai
[2-(3,4-epoxycyclohexyl) ethyl] triphenylsilane was synthesized, using triphenylsilane and 1,2-epoxy-4-vinylcyclohexane as the main raw materials. When the molar ratio of triphenylsilane to 1,2-epoxy-4-vinylcyclohexane was 1.0:1.2, the content of Wilkinson catalyst was 0.4%, the reaction temperature was 90°C, and the reaction time was 6 hours, the yield of [2-(3,4-epoxycyclohexyl) ethyl] triphenylsilane could reach 95.21%. The structure of the synthesized product was analyzed and characterized using FT-IR and 1H-NMR. The synthesized product was added to a bisphenol A-type epoxy resin (E-51) and a modified amine (593 amine) to prepare an adhesive. Then, the adhesive was poured into the mold and cured at 35°C for 8 hours. The cured sample exhibited the best performance when the ECETPS: E-51:593 amine molar ratio was 0.8:7.2:2. Thermal gravimetric analysis (TG) showed that the thermal stability of the cured samples increased relative to pure E-51 amine-cured samples with the synthesized product added. The mechanical properties of the samples were tested using a universal material testing machine, and the results showed a tensile strength of 37.95 MPa and a bending strength of 39.10 MPa.
研究领域:
有机化学
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材料科学
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DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
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2019
·
IF 1.163
Zhizhou Yang,Shuqing Fu,Cheng Yan,Jinshui Yao,Weiliang Liu
The present research focuses on the synthesis and applications of a series of hyper-cross-linked polymer networks obtained from the one-step Friedel–Crafts reaction of triphenylsilane and formaldehyde dimethyl acetal. The materials were characterized through FTIR, 13C NMR, PXRD, TGA, N2 adsorption-desorption isotherms, H2 sorption and dye adsorption. These materials exhibited increased surface areas of approximately 441–1101 m2 g−1 with increasing ratio of monomer to cross-linker. The H2 storage capacity of the polymer networks reached 1.19 wt % (5.96 mmol g−1) under 1.03 bar and 77.3 K. In addition, the material showed excellent adsorption capacity of 806 mg g−1 for Congo Red and retained their adsorption capacity after recycling nine times. Taken together, the results demonstrate that the obtained hyper-cross-linked polymers could be applied to H2 storage and water treatment.
研究领域:
材料化学
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环境科学
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能源存储
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高分子科学
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吸附技术
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2015
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IF 5.056
Ling Ling Xia,Cai Lian Li,Yan Wang
In this work, two novel poly(vinyl alcohol) (PVA)/organosilica hybrid membranes are developed via the sol–gel process, with phenyltriethoxysilane (PTES) and diethoxydiphenylsilane (DEDPS) as crosslinkers and organosilica precursors, and employed for ethanol dehydration via pervaporation . Effects of organosilane type on the membrane morphology, physicochemical properties and pervaporation performance of the as-fabricated membranes are studied. In addition, the effects of the organosilane loading and the thermal treatment temperature on the physicochemical properties and pervaporation performance of the membrane are explored systematically. Various characterization techniques (FT-IR, TGA, SEM , etc) are employed to illuminate physicochemical changes of membranes. The optimal pervaporation performance of PVA–PTES hybrid membrane with 0.4 mmol/g PTES loading and thermally treated at 80 °C has a flux of 145 g/m 2 h and a separation factor of 1026 for the pervaporation dehydration of 85% ethanol aqueous solution at 40 °C.
研究领域:
化学工程
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膜科学
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材料科学
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分离技术
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DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Meiijian Wang,Hao Wang,Shiyun Lou,Dexi Tao,Yaolin Tang,Bingfang Zou,Yongqiang Wang
Liquid-phase microextraction (LPME) relies critically on precise solvent control to achieve efficient extractant recovery. To address this, we developed a magnetic microparticle-based dispersive liquid-phase microextraction (MP-DLPME) strategy, employing hydrophobic porous Fe 3 O 4 microparticles (∼1 μm) as solvent-stabilizing microcarriers. These microparticles were functionalized via covalent grafting of 3-chloropropyltriethoxysilane (CPS) and optimized porosity, enabling rigid confinement of organic solvents (e.g., 1-octanol) through dual mechanisms: (I) hydrophobic solvent anchoring to modified surfaces and (II) capillary trapping within mesopores. When applied to hydrophobic polycyclic aromatic hydrocarbons (PAHs) and organophosphorus pesticides (OPPs), the system generates solvent-encapsulated magnetic aggregates that dynamically fragment into microdroplets under vortex-induced shear forces, facilitating efficient analyte extraction via magnetic collection. By integrating the high efficiency of dispersive extraction with the rapid recovery of magnetic separation, the MP-DLPME method provides a robust sample pretreatment solution for environmental water analysis.
研究领域:
分析化学
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环境科学
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材料科学
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样品前处理
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污染物检测
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产品关联
DOI
PubMed
高影响因子
TALANTA
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2020
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IF 5.339
Guifeng Liu,Huan Liu,Yuanjun Tong,Linyan Xu,Yu-Xin Ye,Cheng Wen,Ningbo Zhou,Jianqiao Xu,Gangfeng Ouyang
Headspace solid-phase microextraction (HS-SPME) of low volatile analytes from complex aqueous samples can be substantially facilitated by elevating the temperature of the samples. However, many SPME coatings prepared from novel sorptive materials may suffer from low stabilities in hot water steam. Herein, a superhydrophobic metal-organic framework (MOF) derived from decorating the metal-oxo nodes of the amino-functionalized UiO-66(Zr) with phenylsilane was prepared and successfully developed into a novel SPME fiber coating. The highest extraction efficiencies towards the semi-volatile ultraviolet (UV) filters were achieved when the aqueous samples were heated up to 100 °C. It was notable that the lab-made coating exhibited extraordinary stability towards hot water steam, probably because the hydrophobic groups capped on the MOF prevented water molecules from entering and deconstructing its lattice. Even after being treated with water steam under 100 °C for 21 h, the extraction performance of the coating remained unchanged, and the crystal structure of the MOF maintained. Furthermore, a negligible matrix effect was observed even in the samples containing humic acid. Under the optimal extraction and thermal desorption conditions, a method for determining UV filters in aqueous samples was established, which possessed low detection limits (0.6–2.1 ng L −1 ), wide linear ranges (10–50000 ng L −1 ), good inter-fiber reproducibility (2.3–6.0%, n = 6), and satisfying intra-fiber repeatability (1.8–5.8%, n = 3). The method was successfully applied in quantifying UV filters in environmental water samples. In addition, the lab-made NH 2 -UiO-66(Zr)-shp-coated fiber was also suitable for the analysis of polycyclic aromatic hydrocarbons (PAHs). This study provided an effective strategy for preparing MOF coatings that can maintain their crystalline structures and high extraction performances in high-temperature steam.
研究领域:
分析化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2019
·
IF 3.372
Jun Zhang,Kaijun Dong,Weimin Luo
A facile and mild method for the catalytic production of 2,5-dimethylfuran (DMF) from 5-hydroxymethylfurfural (HMF) was developed, which utilized commercial PdCl 2 as the catalyst together with the green, non-toxic and low-cost hydride source, polymethylhydrosiloxane (PMHS). A synergistic effect among hydrogen donor, in situ generated metallic Pd 0 species and acid site HCl in the reaction played a key role in DMF formation. Gratifyingly, the desirable yield of hydrodeoxygenation product DMF as high as 89.7% from HMF was attained at room temperature (298 K) in 0.5 h. Meanwhile, biomass derived sugars also could be converted into DMF in relative high efficiency via a one-pot reaction in the present system. A plausible pathway for the hydrodeoxygenation of HMF into DMF in the present system was also proposed. The study thus highlights a new perspective for a simple, green, and efficient hydrodeoxygenation of biomass derivatives under milder conditions, employing a readily available, inexpensive and practical catalytic system of PdCl 2 -PMHS-ethanol, but without any external hydrogen supplies and pre-reduction treatments.
研究领域:
化学工程
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可再生能源
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2022
·
IF 3.662
Ming Yuan,Dayun Huang,Zefeng Wang,Xin Chen,Minghua Yang
Hydrosilanes, including diethylsilane (DES), triethylsilane (TES), phenylsilane (PSH), and diphenylsilane (DPS), have in the present study been used as initiators for the preparation of poly(methyl methacrylate) (PMMA) in the presence of Pd nanoparticles (Pd NPs). DPS initiated the polymerization of MMA in the production of PMMA, with a number average molecular weight ( M n ) of 2.00 × 10 6 Da and a dispersity (PDI) of 1.81 in the presence of 18.9 ppm of Pd NPs. The kinetic of the polymerization was investigated and the reaction orders, with regard to the MMA, DPS, and Pd NPs, were calculated as 0.85, 0.58, and 0.80, respectively. The molecular weight of the PMMA was measured using gel permeation chromatography (GPC) and the structure was characterized using proton nuclear magnetic resonance ( 1 H NMR). The transmission electron microscopy (TEM) and electron spin resonance (ESR) results revealed that the polymerization took place at the surface of the Pd NPs through a radical mechanism.
研究领域:
材料科学
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化学工程
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高分子化学
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产品关联
DOI
高影响因子
Biosensors-Basel
·
2023
·Vol. 13
·期 3
·330
·
IF 5.4
Jing Neng,Yazhi Wang,Yilong Zhang,Peng Chen,Kai Yang
The quinolone antibiotics represented by enrofloxacin (ENRO) are harmful to the ecological environment and human health due to illegal excessive use, resulting in increasing food residues and ENRO levels in the environment. To this end, we developed a MIPs–SERS method using surface-enhanced Raman spectroscopy (SERS) and molecularly imprinted polymers (MIPs) to detect ENRO in food matrices. Firstly, a layer of silver nanoparticles (Ag NPs) with the best SERS effect was synthesized on the surface of copper rods as the enhancing material by in situ reductions, and then MIPs targeting ENRO were prepared by the native polymerization reaction, and the MIPs containing template molecules wrapped on the surface of silver nanoparticle films (Ag NPs–MIPs) were obtained. Our results showed that the Ag NPs–MIPs could specifically identify ENRO from the complex environment. The minimum detection limit for ENRO was 0.25 ng/mL, and the characteristic peak intensity of ENRO was linearly correlated to the concentration with a linear range of 0.001~0.1 μg/mL. The experimental results showed that in comparison to other detection methods, the rapid detection of ENRO in food matrices using Ag NPs–MIPs as the substrate is reliable and offers a cost-effective, time-saving, highly selective, and sensitive method for detecting ENRO residues in real food samples.Keywords:surface-enhanced Raman spectroscopy;molecularly imprinted polymers;biosensor;enrofloxacin
研究领域:
食品安全检测
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环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2023
·
IF 1.8
Luo Peng,Chen Junteng,Mu Manman
Herein, a series of cobalt nanoparticles embedded in nitrogen-doped porous carbon catalyst (Co@NPC) was prepared through the pyrolysis of tetragonal Co-based metal–organic framework which consisted of Co centers and benzimdazole linkers. Due to large BET specific surface area (389.41 m 2 /g), abundant metallic Co content (39.3%), small Co nanoparticle size and high pyridinic-N content, the as-obtained Co@NPC-700 catalyst exhibited superior catalytic performance for the hydrogenation and one-pot reductive acetylation of nitrobenzene. The high 99.80% conversion of nitrobenzene and 99.56% yield of aniline were acquired in the catalytic hydrogenation of nitrobenzene with hydrazine hydrate at 80 °C for 2 h. Simultaneously, the above catalyst showed high conversion (87.2%) and selectivity (95.3%) for the one-pot reductive acetylation of nitrobenzene in the presence of phenyl silane at room temperature. Additionally, Co@NPC-700 exhibited excellent activities for the catalytic hydrogenation and one-pot reductive acetylation of other nitroarenes as well as good recyclability. This work offered a facile approach to prepare metallic Co loaded on porous carbons, serving as efficient catalysts for catalytic reductive applications.
✓ 已验证
产品关联
DOI
高影响因子
ChemSusChem
·
2023
·
IF 8.4
Kaizhi Wang,Zehui Sun,Wendi Guo,Mugeng Chen,Conglin Zhu,Jiachen Fei,Yongmei Liu,Heyong He,Yong Cao,Xinhe Bao
Graphical Highly selective degradation of polylactide (PLA) waste can be achieved through the use of supported-metal catalysts and molecular oxygen in water, process, known as “catalyst-controlled tandem hydrolysis-oxidation”, that offers a high flexibility and pathway-specific control. It is also scalable and operationally efficient, enabling complete conversion of PLA waste into valuable feedstocks such as pyruvic acid, acetic acid, or a mixture of acetic acid and formaldehyde through carbon upcycling. As plastic waste pollution continues to pose significant challenges to our environment, it is crucial to develop eco-friendly processes that can transform plastic waste into valuable chemical products in line with the principles of green chemistry. One major challenge is breaking down plastic waste into economically valuable carbon resources. This however presents an opportunity for sustainable circular economies. In this regard, a flexible approach is presented that involves the use of supported-metal catalysts to selectively degrade polylactide waste using molecular oxygen. This protocol has several advantages, including its operation under organic solvent-free and mild conditions, simplicity of implementation, and high atom efficiency, resulting in minimal waste. This approach enables the chemical upcycling of polylactide waste into valuable chemicals such as pyruvic acid, acetic acid, or a mixture containing equimolar amounts of acetic acid and formaldehyde, providing a viable alternative for accessing key value-added feedstocks from waste and spent plastics.
研究领域:
环境科学
·
绿色化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）