FOOD CHEMISTRY
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2012
·
IF 3.655
Jie-Ping Fan,Jing Cao,Xue-Hong Zhang,Jun-Zhong Huang,Tao Kong,Sheng Tong,Zhe-You Tian,Yan-Long Xie,Rui Xu,Jian-Hang Zhu
Ionic liquid (IL) based ultrasonic assisted extraction (ILUAE) was developed for the effective extraction of puerarin from Radix Puerariae Lobatae (RPL). The ILUAE parameters including the type of ILs, IL concentration, RPL amount, ultrasonic power and time were optimized by single-factor experiment and response surface methodology. Under the optimized experimental conditions, the best results were obtained using RPL amount 0.43 g in 10 mL 1.06 mol L −1 1-butyl-3-methylimidazolium bromide aqueous solution, ultrasonic time 27.43 min and ultrasonic power 480 W. Scanning electron microscope images of RPL samples were obtained to provide visual evidence of the sonication effect. Compared with the conventional ultrasonic assisted extraction and refluent extraction, the proposed ILUAE offered shorter extraction time and remarkable higher efficiencies due to the higher penetration ability and solubility of IL and the cavitation phenomenon produced in the solvent by the passage of an ultrasonic wave, which further supported the suitability of the proposed approach.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Kai Chen,Miancai Chen,Yuhong Feng,Gaobo Yu,Lei Zhang,Jiacheng Li
Four different surface fractal dimensions ( D sf ’s) of anisotropic silica (SiO 2 -x) similar in size were synthesized by layer-by-layer molecular imprinting strategy. Grafting was confirmed by FT-IR and X-ray photoelectron spectroscopy. The surface and interfacial properties of particles were confirmed by transmission electron microscopy, nitrogen adsorption, dynamic light scattering, and contact-angle measurement. Results showed that D sf ’s of SiO 2 -1, SiO 2 -2, SiO 2 -4, and SiO 2 -6, were 2.47, 2.55, 2.62, and 2.56, respectively. Moreover, the modified silica shape varied from spherical to anisotropic particle, and particle hydrophobicity decreased with increased the D sf . Stable emulsions were prepared by these particles. The effects of particle concentration, hydrophobicity, and D sf on the formation, stability, and rheology of emulsions were investigated using an optical microscopy and rheometer. Optical microscopy images showed that unmodified silica failed to form stabilized emulsions due to excellent hydrophility, and particles with D sf = 2.62 and 0.2 wt% concentration were the best for stabilized emulsions. Moreover, increased D sf led to decreased droplets size smaller and easier network formation. Rheology measurement further showed that increased D sf led to increased viscoelasticity and thermal stability of emulsions due to the formation of rigid volume-filling networks. This finding indicated that the particle fractal structure strongly affected the structures in the suspension to immobilize the emulsion droplets in these networks. Emulsion also exhibited longer λ-cyhalothrin release speed with increasing D sf using λ-cyhalothrin as model hydrophobic drug. The λ-cyhalothrin release kinetics well-fitted the Weibull model.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2015
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IF 2.999
Jianfei Zhang,Chengyi Chu,Aihua Sun,Si Ma,Xuanxuan Qiao,Chongyang Wang,Jianjun Guo,Zhixiang Li,Gaojie Xu
The double-sided structural color of Fe 3 O 4 @SiO 2 NPs under external electric field was found. Corresponding colloidal suspension of Fe 3 O 4 @SiO 2 showed a highly adjustable structure color change on both sides of the display cell with the applying of electric fields. As the applied voltage increased, the color changed from red to green then to blue at positive plate, at the same time, the color changed from red to gray then to red at the negative plate. Under a certain electric field, the reflection peak move backwards within a particular range of wavelength. It may be caused by the emergence of another repulsive force-“solvation force” at small interparticle distances.
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FUEL
·
2022
·
IF 8.035
Tao Shen,Zhenwen Hu,Qingya Liu,Yuxin Yan,Zhenyu Liu
Hydrogen storage solvents (HSs) have drawn worldwide attention for viable transportation and utilization of hydrogen. The industrial HSs are mostly mixtures of countless compounds and have been used directly in hydrogenation reactions for decades, such as in the direct coal liquefaction. A good HS is of high hydrogen donation capacity, Q H , and a low initial hydrogen donation temperature, T i . These parameters have been quantified for some model HSs but not for real HSs. This work evaluates Q H and T i of 4 real HSs with two radical precursors and a first order kinetics, and correlates these parameters with molecular structures of the HSs. It is found that the maximum Q H of real HSs is in the range of 20.8–36.3 mmol/g, which are higher than some model HS, such as dihydrophenanthrene (DHP) and dihydroanthracene (DHA), and one of them is even higher than that of tetralin (THN). The T i of real HSs is in the range of 224.8–263.3 °C, which are similar to or slightly higher than those of DHP and DHA. The order of these parameters is found to be consistent with some of the HSs’ structure parameters, such as those characterized by GC × GC − MS, 13 C NMR and 1 H NMR.
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CRYSTAL GROWTH & DESIGN
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2015
·
IF 4.891
Ai-Yan Li,Lin-Lin Xu,Jia-Mei Chen,Tong-Bu Lu
A potassium-sparing diuretic, triamterene, shows a low oral bioavailability with wide intersubject variation due to its poor aqueous solubility (45 μg/mL). To improve its solubility, a group of pharmaceutically acceptable coformers were screened with triamterene by slurry and liquid-assisted grinding methods, and dl-mandelic acid (1) and saccharin (2) successfully cocrystallized with triamterene to form one anhydrous and one monohydrate molecular salt, respectively. Both new forms were characterized by spectroscopic methods, thermal analysis, and X-ray diffraction. Their single crystal structures reveal that proton transfer from coformers to the nitrogen atom of the pyrimidine group in triamterene and the coformer anions thus connect to the protonated triamterene by multiple hydrogen bonded heterosynthons. The apparent solubility values and intrinsic dissolution rates of 1 and 2 in simulated gastric fluid (pH 1.20) are higher than those of parent drug, indicating the solubility of triamterene can be effectively improved by cocrystallization. The exposure of 1 and 2 to 0–95% RH levels and accelerated ICH condition of 40 °C/75% RH confirm their stability and the potential of these new forms to envisage new, more efficient formulations of triamterene.
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POLYMER DEGRADATION AND STABILITY
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2018
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IF 3.193
Zhenhui Bai,Ke Shi,Tingting Su,Zhanyong Wang
Poly(butylene succinate) (PBS), poly(butylene adipate) (PBA), and poly(butylene suberate) (PBSub) were synthesized and enzymatic hydrolysis was performed in the presence of cutinase. The residues degraded at different times were characterized with respect to their molecular, thermal, crystalline, and chemical structures . The results showed that the degradation behavior of the three polyesters highly depends on their CH 2 /CO ratio, morphology, and thermal characteristics. The three polyesters were nearly degraded after 24 h, and the degradation rates was in the order of PBSub > PBA > PBS. Gel permeation chromatography and end-group analysis confirmed that the mechanism of enzymatic hydrolysis changed from endo-type to exo-type. The analyses of differential scanning calorimetry , powder X-ray diffraction, and Fourier transform infrared spectroscopy indicated that the cutinase could simultaneously degrade the crystalline and amorphous regions of polyester films.
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ACS Nano
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2020
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IF 14.588
Zhirong Liu,Xi Liang,Huanhuan Liu,Zhuo Wang,Tao Jiang,Yuanyuan Cheng,Mengqi Wu,Deli Xiang,Zhou Li,Zhong Lin Wang,Linlin Li
Electroporation is an effective approach for drug and gene delivery, but it is still limited by its low-throughput and severe cell damage. Herein, with a self-powered triboelectric nanogenerator as the power source, we demonstrated a high-throughput electroporation system based on the design of biocompatible and flexible polypyrrole microfoam as the electrode within the flow channel. In particular, to lower the imposed voltage, one-dimensional (1D) Ag nanowires were modified on the microfoam electrode to build up a locally enhanced electric field and reduce cell damage. The self-powered electroporation system realized a successful delivery of small and large biomolecules into different cell lines with efficiency up to 86% and cell viability over 88%. The handle throughput achieved as high as 105 cells min–1 on continuously flowed cells. The high-throughput and self-powered electroporation system is expected to have potential applications in the fields of high-throughput drug and gene delivery for in vitro isolated cells.
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PubMed
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ENERGY & FUELS
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2015
·
IF 2.79
Wenan Deng,Jing Lu,Chuan Li
2,6-Diisopropylnaphthalene (2,6-DIPN), 1-methylnaphthalene (1-MN), and biphenyl (BP) were selected as model compounds to investigate the hydrogenation behavior of bicyclic aromatics. The experiments were conducted in a micro-autoclave in the presence of a dispersed catalyst at a temperature from 380 to 430 °C and pressure from 3 to 15 MPa. Through the analysis of the reaction products by gas chromatography–mass spectrometry (GC–MS) and gas chromatography (GC), the results revealed that hydrogenation of aromatics can be promoted significantly in the presence of a dispersed catalyst. A high selectivity toward monocyclic aromatic products was observed in hydrogenation of these model compounds, and its behavior was affected by the presence of substituents and a π-conjugated bridge on an aromatic ring. The yield of hydro-bicyclic aromatics increased with the temperature and hydrogen pressure, while sometimes, ring hydrogenation was influenced by thermodynamic properties of aromatics. Reaction pathways for hydrogenation of 2,6-DIPN, 1-MN, and BP in the presence of a dispersed catalyst were proposed.
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WATER RESEARCH
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2018
·
IF 7.051
Yang Zhou,Jin Jiang,Yuan Gao,Su-Yan Pang,Jun Ma,Jiebin Duan,Qin Guo,Juan Li,Yue Yang
Recently, in situ chemical oxidation (ISCO) using peroxymonosulfate (PMS) for environmental decontamination has received increasing interest. In this study, oxidation kinetics and products of four steroid estrogens (i.e., estrone, 17β-estradiol, estriol, and 17α-ethinylestradiol) by PMS under various conditions were investigated. PMS could fairly degrade steroid estrogens over the pH range of 7–10, and the degradation rate increased with the increase of solution pH. This pH-dependence was well described by parallel reactions between individual acid-base species of steroid estrogens (E and E − ) and PMS (HSO 5 − and SO 5 2− ), where specific second-order rate constants for E − with HSO 5 − and SO 5 2− were in the range of 2.11–5.58 M −1 s −1 and 0.77–1.25 M −1 s −1 , respectively. Identification of oxidation products by liquid chromatography/electrospray ionization quadrupole time-of-flight mass spectrometer showed that PMS readily oxidized the phenolic group of steroid estrogens, leading to the generation of hydroxylated and ring-opening products. The presence of bromide and chloride ions (Br − and Cl − ) at environmentally relevant levels could greatly accelerate the degradation of steroid estrogens by PMS with the formation of halogenated aromatic products. This effect was quantitatively estimated by a kinetic model, where the formation of free bromine and chorine and their rapid electrophilic substitution with steroid estrogens were taken into consideration. Eco-toxicity of transformation products of 17α-ethinylestradiol by PMS treatment in the absence and presence of bromide and chloride was estimated by quantitative structure–activity relationship analysis using ECOSAR. These findings advance the understanding of ISCO using PMS.
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PubMed
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 20
·7486-7494
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IF 5.287
Xuning Li,Alexandre I. Rykov,Bo Zhang,Yanjie Zhang,Junhu Wang
A series of nitrogen-doped graphene encapsulated FexCoy bimetallic (FexCoy@C) nanocages were newly fabricated via a one-step thermal decomposition of Prussian blue analogue FeyCo1−y[Co(CN)6]0.67·nH2O nanospheres at different temperatures. The as-synthesized FexCoy@C nanocages were systematically characterized and applied as effective catalysts to activate peroxymonosulfate (PMS) for the removal of bisphenol A (BPA). The catalytic activity of Fe3Co7@C-650 obtained at 650 °C was found to be the highest and also much higher than that of metallic cobalt, cobalt oxide and cobalt–iron spinels. The nitrogen-doped graphene shells were demonstrated to be effective in preventing the release of metal ions, thus resulting in a better stability. Furthermore, the BPA degradation pathway was proposed based on GC-MS and LC-MS results. The involved radicals were identified through electron paramagnetic resonance and radical scavenger experiments. Based on the systematic characterization of the catalyst before and after the catalytic oxidation reaction, the overall mechanism of PMS activation over FexCoy@C nanocages was proposed. Results indicate that FexCoy@C nanocages are available to serve as promising materials for environmental remediation by activation of PMS.
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ACS Applied Materials & Interfaces
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2016
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IF 7.145
Bo Yuan,Xiao-Qian Yin,Xiao-Qin Liu,Xing-Yang Li,Lin-Bing Sun
Much attention has been paid to metal–organic frameworks (MOFs) due to their large surface areas, tunable functionality, and diverse structure. Nevertheless, most reported MOFs show poor hydrothermal stability, which seriously hinders their applications. Here a strategy is adopted to tailor the properties of MOFs by means of incorporating carboxyl-functionalized natural clay attapulgite (ATP) into HKUST-1, a well-known MOF. A new type of hybrid material was thus fabricated from the hybridization of HKUST-1 and ATP. Our results indicated that the hydrothermal stability of the MOFs as well as the catalytic performance was apparently improved. The frameworks of HKUST-1 were severely destroyed after hydrothermal treatment (hot water vapor, 60 °C), while that of the hybrid materials was maintained. For the hybrid materials containing 8.4 wt % of ATP, the surface area reached 1302 m2·g–1 and was even higher than that of pristine HKUST-1 (1245 m2·g–1). In the ring-opening of styrene oxide, the conversion reached 98.9% at only 20 min under catalysis from the hybrid material, which was obviously higher than that over pristine HKUST-1 (80.9%). Moreover, the hybrid materials showed excellent reusability and the catalytic activity was recoverable without loss after six cycles. Our materials provide promising candidates for heterogeneous catalysis owing to the good catalytic activity and reusability.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yaxin Ru,Yajie Chen,Xinyan Yu,Qiuyu Zhang,Yuejia Yin,Guohui Tian
Hollow heterostructured catalysts have been widely investigated and applied in photocatalytic organic reactions. However, achieving hybrid catalysts with optimized hollow structure and controllable components is still a challenge. Herein, Cu-BTC@CuS@CeO 2 ternary heterostructure hollow octahedrons were designed and prepared using a copper-based metal–organic framework (Cu-BTC) as both copper source and template. A thin CeO 2 nanolayer was first formed and covered on the prepared Cu-BTC octahedron surface through a hydrothermal process. In the meanwhile, the Cu-BTC octahedrons were controllably etched in this hydrothermal process, leading to the formation of Cu-BTC@CeO 2 hollow octahedron. The following sulfidation reaction produced Cu-BTC@CuS@CeO 2 double p-n heterojunction hollow octahedrons. Benefiting from the novel hollow octahedron double p-n heterojunctions, excellent visible-near infrared light absorption, and fast charge transfer and separation, the obtained Cu-BTC@CuS@CeO 2 hollow octahedron hybrid catalyst exhibited a significantly higher photocatalytic activity toward the oxidative coupling of amines to imines at room temperature under visible-near infrared light irradiation compared to the control single component catalysts (Cu-BTC, CeO 2 , and CuS) and binary hybrid catalysts (Cu-BTC@CeO 2 , Cu-BTC@CuS, and CuS@CeO 2 ). The enhanced charge transfer at the double p-n heterojunction was discussed. Meanwhile, the photocatalytic oxidation products and reaction mechanism were investigated by surface-enhanced Raman spectroscopy, gas chromatography-mass spectrometry, and pyridine adsorption FT-IR spectroscopy. This work presents a promising strategy for the design of multi-component hollow heterostructure catalysts.
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