RSC Advances
·
2016
·Vol. 6
·期 26
·22174-22178
·
IF 3.289
Dezhang Ren,Jun Fu,Lu Li,Yunjie Liu,Fangming Jin,Zhibao Huo
An efficient process for the production of levulinate esters from biomass-derived furfuryl alcohol in liquid alcohol over commercial α-Fe2O3 was firstly investigated. Among the catalysts we tested, α-Fe2O3, a cheap, commercially available and environmentally benign catalyst, exhibited a remarkable catalytic performance for the transformation and gives levulinate esters in good yield compared to the previous studies. The corresponding esters such as methyl levulinate, ethyl levulinate and butyl levulinate were obtained in high yields under optimized reaction conditions. Several influence factors for the formation of levulinate esters were also discussed. A plausible reaction mechanism for the formation of levulinate ester from furfuryl alcohol was proposed. From the viewpoint of practice and economy, the present study provides a potential application for the efficient synthesis of fine chemicals from biomass-derived compounds over cheap, commercially available and environmentally benign catalysts.
研究领域:
化学工程
·
可再生资源利用
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DOI
高影响因子
Case Studies in Thermal Engineering
·
2021
·
IF 4.724
Jing Fan,Han Mu,Chang Gao,Fenhong Song
Recently, biodiesel is considered as a biodegradable, renewable and high-potential fuel which could be used directly in tradition internal combustion engines. Fuel’ transport properties in high pressure are required to model the process of fuel spray, atomization and combustion accurately. This work, three ethyl esters’ liquid thermal conductivity (biodiesel compounds) in the liquid phase was measured by an experiment system which is established based on a transient hot-wire method with a bare platinum hot wire. The measurements were conducted at the temperatures ranging from 292 K to 372 K and pressure up to 15 MPa. The combined expanded uncertainty of the measurement was estimated to be ±2.0% (in the 0.95 confidence level). For interpolation, the relationship between measured results with temperature and pressure were correlated as a polynomial function, and the maximum deviation of correlations were less than 0.30%.
研究领域:
能源科学
·
物理化学
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DOI
高影响因子
Chem Catalysis
·
2025
·
IF 11.6
Yingxin Ma,Xuyun Guo,Wenfang Yuan,Peinuo Yang,Yu Zhang,Wenxuan Chen,Lejuan Cai,Valeria Nicolosi,Wenlong Wang,Yang Chai,Bocheng Qiu
Electrochemical upcycling of nitrate (NO 3 − ) wastewater to ammonia offers a sustainable route for reclaiming nitrogen resources from waste. However, its practical implementation still faces substantial obstacles, including high energy input and limited selectivity. Here, we report a paired electrochemical system that combines the anodic oxidation of polyethylene terephthalate (PET) hydrolysate, specifically its ethylene glycol (EG) monomer, to glycolic acid (GA) with the cathodic reduction of NO 3 − to ammonia. All of this is made possible by the discovery of a PdCu alloy anode and a CuCo alloy cathode. Built upon experimental demonstration and a theoretical understanding of the improved CO resistance on the PdCu alloy for EG oxidation, as well as the synergy between Cu and Co for NO 3 − reduction, our paired system enables the efficient co-production of GA and ammonia from PET hydrolysate and NO 3 − -containing wastewater. This conceptual design of paired electrochemistry provides an intriguing way to synthesize high-value chemicals from waste resources.
研究领域:
环境科学
·
材料科学
·
化学工程
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DOI
高影响因子
World Journal of Engineering
·
2014
·Vol. 11
·期 3
·271-278
·
IF 0
Leqin He,Jiquan Zhao,Shenjun Qin,Tao Chang,Yuecheng Zhang,Guangqing Zhang,Xiaorui Gao
Five halogen-free amphiphilic Brønsted acidic ionic liquids (ILs) based on 3-(N,N-dimethylalkylammonium)-propanesulphonate quaternary ammonium zwitterions andp-toluene sulphonic acid monohydrate were synthesized. The IL structures were characterized using1H NMR,13C NMR and (ESI)-MS. The IL thermal instability was characterized using TG-DSC. The ILs were used as dual-solvent catalysts for esterification of several carboxylic acids, with different alcohols under mild conditions to study relevant structure-activity relationships. Results showed that the miscibility of the acidic IL, which is affected by the length of the carbon chain in the cation, is an important factor influencing the activity of the catalyst for the esterification reaction. Post-processing steps were simple, and the catalyst could be reused easily.
研究领域:
化学
·
催化科学
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DOI
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Yuanyuan Meng,Lei Zhan,Chichun Hu,Yuke Tang,Daniel Großegger,Xiangqian Ye
Sustainable bio-oil, as a modifier and partial substitute for asphalt binder, is potentially reducing dependence on non-renewable petroleum asphalt in pavement engineering. However, unsatisfactory performance of bio-oil asphalt dramatically hinders the application of bio-oil in pavement engineering. In this paper, bio-oil based polyurethane modified asphalt (BPMA), an innovative way of modifying bio-oil asphalt binder, was explored to prepare a sustainable asphalt binder with satisfactory performance. BPMA was synthesized by virgin asphalt and bio-based polyurethane (BPU), in particular, BPU was pre-assembled by castor oil, isosorbide, and isocyanate. The formulation and synthesis process of BPU were investigated via mechanical property test and fourier transform infrared spectroscopy (FTIR). Attributed to the addition of isosorbide, BPU exhibited a significant decrease in crosslinking density and a remarkable improvement in ductility. Furthermore, BPMA containing various contents of BPU at different curing duration were systematically studied by rotational viscosity, storage stability, fluorescence microscopy, FTIR, dynamic shear rheometer and bending beam rheometer to evaluate workability, compatibility, modification mechanism, working performances. Results showed that BPMA exhibited suitable workability, good compatibility, and satisfactory working performance. Moreover, the microstructure of BPMA transformed from VB-phase dominated island structure to BPU-phase dominated spatial network structure as BPU content increased. FTIR results indicated a combination modification mechanism of physical modification (effect of BPU) and chemical modification (chemical crosslinking between BPU and VB).
研究领域:
材料科学
·
环境工程
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DOI
高影响因子
JOURNAL OF POLYMER ENGINEERING
·
2015
·Vol. 35
·期 9
·847-857
·
IF 0.465
Jingshui Xu,Denglong Chen,Xianglong Hu,Yangchuan Ke,Qian Zhou,Wensuai Gao,Zheling Zeng,Guoliang Zhang
The poly(methyl methacrylate-ethylene glycol dimethacrylate-2-acrylamido-2-methylpropanesulfonic acid) [poly(MMA-EGDMA-AMPS)] microsphere was produced by a soap-free emulsion polymerization of MMA, EGDMA and AMPS. The chemical composition, morphology, particle size distribution and properties of the obtained microspheres were characterized by energy dispersive spectrometer (EDS), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), a laser particle analyzer and thermogravimetric analysis (TGA). Results showed that the microspheres had a high-quality spherical morphology, irrespective of the components, and their particle sizes mainly ranged from 10 μm to 70 μm. The microspheres were thermally stable up to 190°C. As the AMPS loading was increased, the synthetic yield rate decreased and the water uptake increased. The optimum synthetic yield rate and water uptake were obtained at a 2.0 wt% AMPS. In addition, the selected microspheres with a diameter of approximately 25 μm provided an effective plugging, and the plugging rate was up to 80%. This study demonstrated that the plugging behavior of microspheres was due to their deformation, migration and aggregating properties in the plugging process, which made them potential materials for modifying the porous reservoir to enhance oil recovery in petroleum engineering.
研究领域:
材料科学
·
石油工程
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2013
·Vol. 20
·期 7
·1-11
·
IF 2.019
Cheng Chuanjie,Bai Xiongxiong,Liu Shaojin,Huang Qinghua,Tu Yuanming,Wu Haiming,Wang Xiaoji
A cardanol-derived reversible addition-fragmentation chain transfer (RAFT) agent was synthesized in 57 % total yield, and a cardanol-based anionic surfactant was also facilely prepared. Emulsion polymerization of methyl methacrylate (MMA) was realized to form a cardanol-terminated PMMA polymer by using the novel RAFT agent as well as the cardanol-based anionic surfactant. To improve the properties of cardanol-terminated PMMA as a material, UV-curing was performed. According to the comprehensive behavior of the UV-cured resins, optimal irradiation time was 20 min.
研究领域:
材料科学
·
高分子化学
·
可持续化学
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DOI
高影响因子
BIOORGANIC CHEMISTRY
·
2025
·
IF 4.7
Wenhao Zhou,Yijie Cai,Xilei Wang,Yijun Tu,Jiejuan Jiang,Jianqing Yu
Alantolactone (AL) and isoalantolactone (IAL) are the bioactive components of Inula racemosa Hook. f. and constitute a significant portion in this herb. These two compounds are widely utilized in pharmaceuticals, cosmetics, agriculture and other fields due to their extensive biological activities, exhibiting remarkable market potential. However, their current acquirement remains primarily reliant on traditional Chinese medicine, which makes it necessary to optimize the extraction process. Additionally, the minor components, particularly sesquiterpenes, are often overlooked due to the high contents of AL and IAL, which makes their chemical components still unclear. This study developed an HPLC detection method and optimized an ultrasound-assisted extraction process with response surface methodology (RSM), achieving optimal parameters: liquid-solid ratio of 15.34: 1, 88.92 % ethanol, and 49.21 °C. Furthermore, to identify the minor components, a novel combination of Feature-based Molecular Networking (FBMN), Network Annotation Propagation (NAP), and ClassyFire was employed. The results revealed that the minor sesquiterpenes still accounted for a high proportion. Systematic separation yielded 22 sesquiterpenes, including three novel compounds ( 1 – 3 ) and 19 known ones ( 4 – 22 ). Biological evaluation demonstrated that some compounds exhibited stronger cytotoxicity than AL and IAL against HepG2, SKOV3 and HeLa cells, and compound 14 showed the best cytotoxicity via apoptosis induction. Moreover, four compounds exhibited synergistic effects with cisplatin (CDDP) on SKOV3 cells. Compounds 14 and 15 displayed potent anti-inflammatory effects with IC 50 < 3 μM. These findings indicated that the neglected part still contain bioactive sesquiterpenes, deserving for further exploration.
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2024
·Vol. 13
·期 2
·656-667
·
IF 6.1
Ji Wang,Wei Wang,Kejun Li,Yanhua Wu,Xiaoting Yang,Jiping Zhou,Zhijie Zhang,Yongjun Jiang
Wound healing is a challenging due to the presence of bacterial infection, excessive inflammation and angiogenesis disorders. While traditional therapies struggle, a functional hydrogel can effectively repair wounds. However, the use of hydrogels is limited due to their high swelling and excessive dehydration characteristics. Herein, an interpenetrating polymer network hydrogel (HGP@EGCG) based on hyaluronic acid methacrylate (HAMA), glycyrrhizic acid (GA), polyvinyl alcohol (PVA), epigallocatechin-3-gallate (EGCG), and glycerin/water binary solvent was developed by self-assembly, physical entanglement and chemical crosslinking for infected wound healing. GA forms a primary network through self-assembly induced by Zn2+ and HAMA forms a more robust network structure through free radical polymerization as a rigid backbone, followed by the physical entanglement of PVA, which provides additional crosslinks within the network. The robust network structure conferred the HGP hydrogel with low swelling properties. HGP@EGCG hydrogels could adhere to the wound surface, exhibiting adequate tensile and compressive strength to withstand deformations induced by external forces. Then HGP@EGCG hydrogels with good moisture retention could facilitate the maintenance of wound hydration and prolong usage. Moreover, HGP@EGCG hydrogels could release the drug rapidly in an acidic environment and eliminate bacteria. The designed hydrogels demonstrated multifaceted functionality, including suitable adhesion, low swelling, good moisture retention, and efficient antibacterial properties. Both in vitro and in vivo investigations confirmed that HGP@EGCG hydrogels had good biocompatibility and promoted human umbilical vein endothelial cell migration and tube formation, which markedly expedited wound healing. Consequently, HGP@EGCG hydrogels present a broad spectrum of potential applications in the clinical treatment of infected wounds.
研究领域:
生物材料学
·
医学
·
药剂学
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2019
·
IF 1.918
Chenghuan Yang,Liang He,Qingqing Guan,Jiajing Chen,Rongrong Miao,Lei Tao,Ningmeng Hu,Bin Li
Enhancement of the transesterification efficiency of triglyceride has come under heated study in biodiesel-making industry. In this research, the NiMo/La-Al2O3 nanopowders have been prepared for producing biodiesel efficiently. The screening test showed that the NiMo/La-Al2O3 catalyst has the best catalytic activity for triglyceride transesterification. Besides, the process parameters including reaction temperature, time, oil-to-alcohol ratio and catalyst loading etc., also have been investigated for optimization of the transesterification process. The results showed that with 5 wt% of catalyst loading, and oil to methanol molar ratio of 1:9, the conversion yield of triglyceride could be up to 95.2% within 120 min at 160°C. The NiMo/La-Al2O3 catalyst has the outstanding recycle property, which proved that the prepared NiMo/La-Al2O3 powders can be suitable for biodiesels’ production.
研究领域:
化学工程
·
催化
·
可再生能源
·
生物柴油生产
✓ 已验证
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2019
·
IF 1.163
Fulin Zheng,Pingping Jiang,Ling Hu,Yanmin Bao,Jialiang Xia
To examine the reinforcing effects of isocyanated graphene oxide (NCO-GO) on a waterborne polyurethane matrix, the surface of GO was respectively modified by isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and toluene diisocyanates (TDI) and then confirmed by FT-IR, Raman, TGA, XRD, TEM, AFM and SEM-EDS. The dispersity behavior between different NCO-GO and polymer was evaluated by FESEM and XRD. The nanocomposites’ chemical structure, emulsion morphology, hydrophobicity, thermal and mechanical properties were investigated by FT-IR, TEM, TGA, tensile testing machine and water contact angle test, respectively. It was shown that these properties of nanocomposites including tensile strength, initial thermal degradation and hydrophobicity were increased by the incorporation of NCO-GO, in which, particularly, the tensile stress and initial degradation temperature were respectively increased from 13.32 to 18.80 Mpa and 249 to 288 °C after the addition of TDI-GO. These superior reinforcing effects were attributed to the two-dimensional structure of NCO-GO as well as the good interfacial adhesion between the NCO-GO and WPU matrix.
研究领域:
材料科学
·
高分子科学
·
纳米技术
·
表面化学
·
复合材料
✓ 已验证
DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 24
·4272
·
IF 5.1
Mengqi Wang,Yi Zhang,Yunqi Gao,Huanyu Zheng,Mingming Zheng
Ethyl butyrate is a typical flavor ester with pineapple-banana scents, but the poor yield from natural fruits limits its feasibility in food and fragrance industries. In this study, dendritic fibrous nano-silica (DFNS) was hydrophobically modified with octyl groups (DFNS-C 8 ) to immobilize Candida antarctica lipase B (CALB) for solvent-free esterification of ethyl butyrate. The immobilized lipase CALB@DFNS-C 8 , with the enzyme loading of 354.6 mg/g and the enzyme activity of 0.064 U/mg protein, achieved 96.0% ethyl butyrate conversion under the optimum reaction conditions where the molar ratio of butyric acid to ethanol was 1:3, with a reaction temperature and time of 40 °C and 4 h. Under the solvent-free catalytic reactions, CALB@DFNS-C 8 presented the maximum catalytic efficiency of 35.1 mmol/g/h and retained 89% initial activity after ten reuse cycles. In addition, the immobilized lipase can efficiently catalyze the synthesis of various flavor esters (such as butyl acetate, hexyl acetate, butyl butyrate, etc.) and exhibits excellent thermostability and solvent tolerance. A molecular docking simulation reveals that the hydrophobic cavity around the catalytic triad stabilizes the acyl intermediate and ensures the precise orientation of both acid and alcohol substrates. This work provides new insights into the sustainable production of flavor esters using highly active and recyclable immobilized lipases through rational carrier hydrophobization and structural confinement design.
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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）