SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Xu Zhang,Xin Yu,Zehai Xu,Qin Meng,Chong Shen,Guoliang Zhang,Congjie Gao
In this work, a continuous dense zeolite imidazolate framework (ZIF) composite membranes for enhanced gas separation were successfully prepared on diethylenetriamine (DETA) and tannic acid (TA) cross-linked polymeric hollow fiber substrates via the in-situ solvothermal method for the first time. With strong reactivity and small molecular volume, DETA connected various TA molecules and anchored TA molecules on the organic hollow fiber substrate to form a relatively tight spatial network. The modified polyvinylidene fluoride(PVDF) support contained abundant phenolic hydroxyl, carbonyl, and amine groups, providing a large number of active sites for heterogeneous nucleation and promoting the forming of continuous and non-defect MOF film. The synergistic effect between TA and DETA not only enhanced the stiffness and durability of the MOF composite membrane, but also improved the performance of membrane on gas separation. The morphology of the amine/TA modified to support and the MOFs composite membrane was analyzed by SEM, XRD, FTIR, XPS, etc. The fabricated TA-DETA-PVDF/ZIF-8 composite membrane with a continuously dense layer and unique structural stability displayed excellent H 2 permeance of 1.01 × 10 -7 mol·m −2 s −1 Pa −1 and competitive H 2 /N 2 and H 2 /CH 4 selectivity of 24.0 and 24.4, respectively.
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高影响因子
International Journal of Polymeric Materials and Polymeric Biomaterials
·
2023
·
IF 3.2
Jiashuo Liu,Runzhi Xiang,Hongtao Li,Hong Zhu,Jiarui Dang,Zhihui Ran,Huan Deng,Wenjin Xu,Chengjie Xiong,Zhijun Huang,Peihu Xu,Haixing Xu
Here, a novel kind of composite scaffold was fabricated by loading vascular endothelial growth factor (VEGF) and gastrodin liposome (GAS-LP) into electrospun silk fibroin/graphene oxide(SF/GO)nanofibrous and silk fibroin sponge-filled, respectively. Our results demonstrated that VEGF and GAS exhibited different release patterns in vitro which VEGF showed rapid release rate in the first few days while GAS was released slowly and continuously as encapsulated in liposomes. The scaffolds realized the combination of intraneural vascularization drugs and electrical stimulation effectively, leading to enhanced growth of RSC96 cells. Furthermore, the scaffolds could protect RSC96 cells in an inflammatory environment.
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高影响因子
JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 61
·期 15
·1572-1583
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IF 3.4
Bo Li,Juan Li,Shaowen Huang,Shuhao Qin,Nan Liu
Polylactic acid (PLA) packaging materials are useful, safe, and degradable in the natural environment, and hence, have attracted considerable interest. In particular, the barrier properties of PLA are the focus of current research. In this study, organic montmorillonite (OMMT) modified with an epoxy chain extender (CE) was prepared as a barrier functional additive for PLA and PLA alloy materials. The effects of the CE-OMMT on the properties of PLA and PLA/PHA (polyhydroxyalkanoates) composites were investigated. The CE-OMMT was characterized using Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and thermogravimetry (TG). The results showed that the CE-OMMT was successfully synthesized, and that the addition of the CE did not change the crystal structure of OMMT. The morphology and microstructure of the PLA/CE-OMMT and PLA/PHA/CE-OMMT composites were characterized using XRD and transmission electron microscopy (TEM). The dispersion of the CE-OMMT in the PLA and PLA/PHA composite films was significantly enhanced. XRD analysis showed that OMMT intercalated well into the matrix. The rheological, barrier, and mechanical properties of the PLA nanocomposite films were systematically studied. The results showed that the CE-OMMT enhanced the mechanical and barrier properties of the composite films. Compared with neat PLA, the elongation at break of the PLA/CE-OMMT and PLA/PHA/CE-OMMT composite films with the addition of 3% CE-OMMT increased by 449% and 788.4%, the oxygen permeability decreased by 57.74% and 59%, and the water vapor permeability decreased by 44.79% and 53.25%, respectively. Therefore, the modified PLA composite film is a promising substitute for packaging applications. Graphical
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FOOD CONTROL
·
2023
·
IF 6
Ziming Xie,Dequan Zeng,Jingwen Wang,Mouming Zhao,Yunzi Feng
In the present work, a dispersive liquid-liquid microextraction (DLLME) method combined with gas chromatography-mass spectrometry (GC-MS) was successfully developed for accurate determination of aroma-active components in soy sauce . Several key experimental parameters were optimized, including the type of dispersant, vortex time and the volume ratio of extractant and dispersant. The optimal conditions were 1200 μL acetone as dispersant, 800 μL dichloromethane as extractant and 3 min of vortex mixing. The proposed method was validated, achieving good linearities with R 2 ≥ 0.9941, recoveries between 82 and 129% with 4-hydroxy-2,5-dimethyl-3(2H)-furanone (HDMF) and 4-hydroxy-2 (or 5)-ethly-5 (or 2)-methyl-3(2H)-furanone (HEMF) within 84–103%, relative standard deviations ranging from 0.02 to 8.60% with HDMF and HEMF between 0.26 and 1.44%, and limits of detection and limits of quantification in the range of 0.08–35.95 μg/L and 0.25–119.83 μg/L, respectively. The entire sample processing with DLLME was completed in roughly 15 min with a total consumption of 2 mL of organic solvent, and 93 volatiles identified in the obtained extracts, with 87.1% (81 volatiles) showing relative standard deviations lower than 10%. Compared to conventional liquid-liquid extraction (LLE), DLLME exhibited obvious advantages of simplicity, rapidity, stability and low solvent consumption, favouring the extraction of acids and ketones. This is the first application of the DLLME technique for the analysis of aroma compounds in soy sauce and is suitable for rapid determination of key aroma compounds like HDMF and HEMF, especially for routine detection and large batch analysis of soy sauce, which can provide reliable information for soy sauce flavour analysis.
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Advanced Healthcare Materials
·
2023
·
IF 10
Geng Yang,Ting Song,Hanxi Zhang,Mengyue Li,Xiaodan Wei,Wanyi Zhou,Chunhui Wu,Yiyao Liu,Hong Yang
Photothermal therapy (PTT) is considered a promising treatment for tumors; however, its efficacy is restricted by heat shock proteins (HSPs). Herein, a stimuli-responsive theranostic nanoplatform (M/D@P/E-P) is designed for synergistic gas therapy and PTT. This nanoplatform is fabricated by a load of manganese carbonyl (MnCO, CO donor) in dendritic mesoporous silicon (DMS), followed by the coating with polydopamine (PDA) and loading of epigallocatechin gallate (EGCG, HSP90 inhibitor). Upon near-infrared (NIR) irradiation, the photothermal effect of PDA can kill tumor cells and allow for the controlled drug release of MnCO and EGCG. Moreover, the acidity and H 2 O 2 -rich tumor microenvironment enable the decomposition of the released MnCO, accompanied by the production of CO. CO-initiated gas therapy can realize to disrupt the mitochondrial function, which will accelerate cell apoptosis and down-regulate HSP90 expression by decreasing intracellular ATP. The combination of EGCG and MnCO can significantly minimize the thermo-resistance of tumors and improve PTT sensitivity. In addition, the released Mn 2+ enables T 1 -weighted magnetic imaging of tumors. The therapeutic efficacy of the nanoplatform is methodically appraised and validated both in vitro and in vivo. Taken together, this study affords a prime paradigm for applying this strategy for enhanced PTT via mitochondrial dysfunction.
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PubMed
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2023
·
IF 5
Fangjie Wang,Xiaoning Chen,Huichen Li,Bowen Huang,Yu He,Zongwei Cai
The interest in the contaminants in PM 2.5 1 (PMs with a diameter of <2.5 μm) has increased because of its potential adverse effects on human health. In this study, seven alkylphenols (APs), which are a typical endocrine-disrupting chemicals (EDCs), were measured by atmospheric pressure gas chromatography-tandem mass spectrometry (APGC-MS/MS). The methods were successfully applied to analyze the PM 2.5 samples collected from Taiyuan and Guangzhou. The total concentration of seven APs was 700.58 pg m −3 in Guangzhou and 916.12 pg m −3 in Taiyuan. The dominant PM 2.5 -bound APs were 4-pentylphenol (4-PeP), 4-nonylphenol (4-NP), and 2-6-di-tert-butyl-4-(hydroxymethyl)phenol (BHT-OH). Meanwhile, a higher concentration of APs was observed in Taiyuan during spring and winter, according with obvious seasonal variation. The presence of APs in air samples from Guangzhou was primarily attributed to human activities. Furthermore, estimated daily intakes (EDIs) of APs via ambient inhalation were calculated for different age groups to evaluate human exposure risk, which revealed that the worst-case EDI for children was 61.29 pg kg bw −1 day −1 , indicating that the presence of APs in the atmospheric environment should not be underestimated.
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FOOD CHEMISTRY
·
2023
·
IF 8.8
Yujiao Cheng,Leng Han,Linhua Huang,Xiang Tan,Houjiu Wu,Guijie Li
Thermal pasteurization decreases the sensory quality of mandarin juice. Flavor composition was determined in four fresh-squeezed and heat-processed mandarin juice varieties using molecular sensory science approaches. The relationships between odorants and sensory profiles were analyzed, and markers for flavor deterioration were screened by multivariate statistical analysis. Seventy-four volatiles were identified, among which 36 odorants with flavor dilution factors ranging from 2 to 128 were detected by multidimensional gas chromatography-mass spectrometry/olfactometry (MDGC-MS/O) coupled with aroma extract dilution analysis (AEDA). Higher intensities of cooked and off-flavor notes were observed in the heated mandarin juice, which was related to the concentration changes of the methional, methanethiol, dimethyl sulfide, and carbon disulfide by partial least squares (PLS) analysis. Ten potential markers (methional, methanethiol, dimethyl sulfide, hydrogen sulfide, β -damascenone, camphene, trans - β -ionone, decanal, d -limonene, and α -pinene) were responsible for the sensory discrimination of fresh-squeezed and heated mandarin juices.
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PubMed
高影响因子
Frontiers in Nutrition
·
2023
·
IF 5
Su Hongxia,Chen Zhanpeng,Zhao Yuan,An Jiejie,Huang Haohe,Liu Ren,Huang Chongxing
Introduction: Chlorine dioxide (ClO2) is a safe and efficient bactericide with unique advantages in reducing foodborne illnesses, inhibiting microbial growth, and maintaining the nutritional quality of food. However, gaseous ClO2 is sensitive to heat, vibration, and light, which limits its application.Methods: In this study, a ClO2 precursor-stabilized ClO2 aqueous solution was encapsulated by the double emulsion method, and a high-performance ClO2 self-releasing polyvinyl alcohol (PVA) film was prepared to investigate its performance and effect on blueberry quality during storage.Results: The self-releasing films had the best overall performance when the microcapsule content was 10% as the film's mechanical properties, thermal stability, and film barrier properties were significantly improved. The inhibition rates of Listeria monocytogenes and Escherichia coli were 93.69% and 95.55%, respectively, and the mycelial growth of Staphylococcus griseus was successfully inhibited. The resulting ClO2 self-releasing films were used for blueberry preservation, and an experimental study found that the ClO2 self-releasing antimicrobial film group delayed the quality decline of blueberries. During the 14-day storage period, no mold contamination was observed in the ClO2 self-releasing film group, and blueberries in the antibacterial film group had higher anthocyanin accumulation during the storage period.Discussion: Research analysis showed that films containing ClO2 microcapsules are promising materials for future fruit and vegetable packaging.
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PubMed
高影响因子
Scientific Reports
·
2023
·Vol. 13
·期 1
·1-10
·
IF 4.6
Pang Honglei,Qiu Yayu,Sheng Weipeng
Hybrid polyvinylidene fluoride-silica-hexadecyltrimethoxysilane (PVDF-SiO 2 -HDTMS) membranes were fabricated via a non-solvent-induced phase-inversion method to create stable hollow-fiber membranes for use in the membrane contact absorption of carbon dioxide (CO 2 ). The surface properties, performance characteristics, and long-term performance stability of the prepared membranes were compared and analyzed. The outer surfaces of the prepared membranes were superhydrophobic because of the formation of rough nanoscale microstructures on the surfaces and their low surface free energy. The addition of inorganic nanoparticles improved the mechanical strength of the PVDF-SiO 2 -HDTMS. Long-term stable operation experiments were carried out with a mixed inlet gas (CO 2 /N 2 = 19/81, v/v) at a flow rate of 20 mL/min. The absorbent liquid in these experiments was 1 mol/L diethanolamine (DEA) at a flow rate of 50 mL/min. The mass transfer flux of CO 2 through the PVDF-SiO 2 -HDTMS membrane decreased from an initial value of 2.39 × 10 –3 mol/m 2 s to 2.31 × 10 –3 mol/m 2 s, a decrease of 3% after 20 days. The addition of highly stable and hydrophobic inorganic nanoparticles prevented pore wetting and structural damage to the membrane. The PVDF-SiO 2 -HDTMS membrane was found to have excellent long-term stable performance in absorbing CO 2 .
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2018
·
IF 2.196
Jia-nan Zheng,Mingjun Yang
Carbon dioxide (CO2) emission and fresh water scarcity have become two huge global issues over the last decades, and CO2 hydrate-based technology was promoted and developed to address them. This study investigated the effects of methylcyclopentane (MCP) on the hydrate formation condition and CO2 capture efficiency. Five cases and 31 cycles experiments of different MCP/water molar ratios (ranging from 0 to 0.03) in salt solution and porous media were conducted using the isochoric method. The hydrate phase equilibrium data of CO2–MCP hydrates were measured, and meanwhile the CO2 capture efficiencies were calculated. The results indicated that the rising MCP concentrations increase both the hydrate equilibrium temperature and the gas uptake. After the comparisons of the interpolated hydrate gas uptakes at uniform hydrate phase equilibrium pressure of 3 MPa among CO2–MCP, CO2–CP (cyclopentane), and CO2–C3H8 (propane) hydrates, CO2-MCP hydrates are especially suitable for CO2 capture. It should be noted that MCP is likely to form s-H hydrate with CO2 gas, but further confirmation is needed. Anyway, MCP can be thought as a potential coguest for integrated hydrate-based CO2 capture and desalination process.
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高影响因子
ENERGY & FUELS
·
2019
·
IF 3.021
Lingjun Ma,Caixia Yue,Liang Ye,Qihuang Huo,Lina Han,Liping Chang,Weiren Bao,Jiancheng Wang
Pd–Fe bimetallic sorbents were shown to be a great potential sorbent for Hg0 removal from coal-derived fuel gas. In this work, activated carbon (AC), Al2O3, and Beta molecular sieve were chosen as supports to disperse Pd–Fe bimetallic components. The effects of the supports on Hg0 removal of Pd–Fe bimetallic sorbents were evaluated using a fixed-bed reactor at 200 °C. The regeneration performance of sorbents was also investigated. The results showed that Hg0 removal activity and regeneration performance over Pd–Fe/AC was the best, followed by Pd–Fe/Beta, and Pd–Fe/Al2O3. The Hg0 removal efficiency of Pd–Fe/AC bimetallic sorbents remained above 80% within 400 min after regeneration 4 times. The Pd–Fe bimetallic sorbents were characterized by N2 adsorption–desorption, Fourier transform infrared spectroscopy, X-ray diffraction, CO pulse adsorption, Hg temperature-programmed thermal desorption, and X-ray photoelectron spectroscopy. The analysis results revealed that three sorbents had a similar Hg0 removal mechanism. Hg0 transformed to Pd–Hg amalgam and HgS after reacting with the sorbents. Pd0 and Fe2O3 were the active species for the removal of Hg0. The removal performance of Hg0 by Pd–Fe/Al2O3 sorbents was the lowest. It is because Pd–Fe/Al2O3 sorbents have the lowest specific surface area, surface content, and dispersion degree of the Pd component. Furthermore, Pd0 over Pd–Fe/Al2O3 sorbents was severely poisoned and transformed to PdS during the regeneration process.
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ChemCatChem
·
2018
·Vol. 10
·期 20
·4689-4698
·
IF 4.674
Yan Liu,Ye Wu,Zarina Akhtamberdinova,Xiaoping Chen,Guodong Jiang,Dong Liu
Graphical High fives ! The catalyst 5Ni-5Ce exhibits the best catalytic performance in the dry reforming of shale gas and CO 2 . The introduction of Ce creates strong interaction between Ni and Ce, which enhances the electron transfer between them. And the substitution of Ni for Ce produces oxygen vacancies and defects, which can accelerate the adsorption and activation of the reactant gases molecule, further promoting the reaction. The dry reforming of shale gas (methane and ethane with an average ratio of 4 : 1) with carbon dioxide (DRS) is considered to be a promising way to produce syngas, which widens the utilization of shale gas and mitigates carbon dioxide emission. In this paper, Ce modified Ni-based catalysts were developed and the corresponding catalytic performances for DRS were investigated with a fixed bed reactor. Results showed that the catalyst containing 5 wt% of Ni and 5 wt% of Ce performed a best catalytic effect, including the selectivity of syngas and the carbon resistance performance, which is due to the good metal dispersion, strong interaction between Ni and Ce, and the formation of Ni-CeO x solid solution. The electron transfer between Ni and Ce, substitution of Ni for Ce, and the sequential oxygen vacancies or defects, play significant roles in activating CH 4 , C 2 H 6 and CO 2 . The conversion of reactant gas increased with temperature, while the selectivity of syngas is little affected with temperature. In addition, the desired catalyst containing 5 wt% of Ni and 5 wt% of Ce showed good stability in the long-time operation, which indicates that the Ce modified Ni-based catalyst is a promising one for the dry reforming of shale gas.
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