MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Huijie Qin,Tongwei Zhang,Lihong Bao,Bo Dang,Jianxi Li
The high flammability of ethylene vinyl acetate copolymers (EVA) limits its important applications in fire safety, and the addition of highly effective flame retardants can improve this deficiency. Melamine cyanurate (MCA) has limited carbon-forming ability and therefore is often combined with other flame retardants to achieve synergistic flame retardant effects and thus improve the flame retardancy of EVA. Therefore, in this study, MoS 2 @Fe 3 O 4 hybrid materials were synthesized by in-situ growth of molybdenum disulfide (MoS 2 ) and ferric oxide (Fe 3 O 4 ) and their structures were characterized using various techniques. The hybrids were blended with melamine cyanurate (MCA) into ethylene vinyl acetate copolymer (EVA) by melt blending method to reduce the fire hazard. The EVA composites with 1.0 wt% MoS 2 @Fe 3 O 4 blends significantly improved the coke residue and limiting oxygen index values to 22.5 % and 23.2 %, while their peak heat release rate, total heat release, and total smoke release were reduced by 62.5 %, 11.7 %, and 35.3 %, respectively, as compared to pure EVA. The results suggest that the use of MoS 2 @Fe 3 O 4 hybrids in combination with MCA is a promising strategy for the development of advanced flame-retardant materials.
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高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Dehua Wang,Biqian Wei,Yi Zhang,Tongxin Xie,Jing Yu,Yong Xue,Biao Kong,Changhu Xue,Qingjuan Tang
Excessive salt consumption is strongly linked to the chronic diseases development, highlighting the urgent need for effective salt-reduction strategies in food products. However, reducing salt content often compromises both food preservation and flavor. In this study, we hypothesized that curcumin could enhance the flavor perception of sodium chloride while compensating for its antimicrobial effect in reduced-salt applications. To test this, we developed a curcumin/γ-cyclodextrin/sodium chloride complex (IC), using γ-cyclodextrin as a carrier, and evaluated its antimicrobial and flavor-enhancing properties. The complex's formation was confirmed through various analytical techniques. Results from electronic tongue and sensory evaluations demonstrated that the IC enhanced the perception of saltiness and imparted unique aromatic characteristics compared to standard sodium chloride. GC-IMS analysis identified key aroma contributors, such as aldehydes and alcohols. Additionally, antimicrobial tests revealed that the IC efficiently mediated the sono/photodynamic inactivation of Shewanella putrefaciens and Vibrio parahaemolyticus . In summary, the IC offers a multifunctional approach, enhancing flavor, reducing salt, and enabling antimicrobial activity, while promoting practical uses of sono/photodynamic technology in low-sodium foods.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2024
·Vol. 47
·期 6
·957-969
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IF 3.5
Zou Xiao-Zhou,Gong Lu-Chan,Li Ting-Ting,Lv Shu-Yi,Wang Jun
γ-Aminobutyric acid (GABA) is a crucial neurotransmitter with wide application prospects. In this study, we focused on a GABA-producing strain from a traditional Chinese fermented beverage system. Among the six isolates, Lactobacillus hilgardii GZ2 exhibited the greatest ability to produce GABA in the traditional Chinese fermented beverage system. To increase GABA production, we optimized carbon sources, nitrogen sources, temperature, pH, and monosodium glutamate and glucose concentrations and conducted fed-batch fermentation. The best carbon and nitrogen sources for GABA production and cell growth were glucose, yeast extract and tryptone. Gradual increases in GABA were observed as the glucose and monosodium glutamate concentrations increased from 10 g/L to 50 g/L. During fed-batch fermentation, lactic acid was used to maintain the pH at 5.56, and after feeding with 0.03 g/mL glucose and 0.4 g/mL sodium glutamate for 72 h, the GABA yield reached 239 g/L. This novel high-GABA-producing strain holds great potential for the industrial production of GABA, as well as the development of health-promoting functional foods and medical fields.
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PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2025
·
IF 5.2
Zi-Quan Wang,Ya-Peng Du,Xiao-Ping Zheng,Yu Chai,Yu-Cang Zhang,Yan-Zhen Zheng
The direct conversion of raw lignocellulosic waste into specialty chemicals such as levulinic acid (LA) has the potential to significantly enhance biorefinery profitability. Here, we demonstrated that incorporating γ-valerolactone (GVL) as a co-solvent during the SO 3 H-functionalized ionic liquid-catalyzed conversion of bagasse in water markedly enhanced reaction rates and catalytic activity, achieving a LA yield as high as 76.1 % with a 1:1 vol ratio of GVL to water. This catalytic system also effectively converted other lignocellulosic waste to LA. Reaction constants and activation energies for the bagasse dehydration process to LA were obtained. Comprehensive characterization via Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and X-ray diffraction (XRD) elucidated significant changes in functional groups, surface morphology, and crystallinity index of solid residues over extended reaction times. Notably, hemicellulose and cellulose were converted within 4 h, with lignin remaining in the solid residues and forming by-products after prolonged reaction times. This efficient one-pot conversion method showed promise as a sustainable approach to transform agricultural waste into LA, offering new opportunities for eco-friendly resource utilization.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yuhan Wang,Qingyuan Xu,Bao Lu,Jinfeng Sun,Zhonglun Zhang,Chuanlin Hu,Guihua Hou
In the preparation of foam concrete (FC), reconciling the contradiction of porosity (or thermal conductivity) and mechanical strength poses a significant challenge. In this paper, the strategy of regulating the carbonation of γ-2CaO·SiO 2 (γ-C 2 S) to form aragonite whiskers for strengthening the pore wall was proposed, thereby achieving the highest possible total porosity while meeting the required compressive strength. The controlled formation of aragonite and its strengthening mechanism of pore wall, as well as the optimum preparation conditions of FC formed by γ-C 2 S carbonation were studied. The results indicated that the CaCO 3 in the pore walls predominantly existed in the form of whisker-like aragonite under the action of modifier MgCl 2 ·6H 2 O, and the mass content of aragonite achieved 53.4 %, almost without calcite. Under the optimum preparation conditions, the thermal conductivity and compressive strength of aragonite foam concrete (AFC) were 0.0496 W/m·K and 0.5 MPa, respectively. Compared with calcite foam concrete (CFC) formed without the regulator, the compressive strength was increased by 150 % and the thermal conductivity was decreased by 5.2 %, it showed that thermal conductivity and mechanical strength were reconciled. Based on pore structure analysis, the formation of aragonite reduced the pore wall porosity (PP) and refined the most probable pore size. Furthermore, the CO 2 absorption rate reached 45.4 % under the carbonation of 84 h. This provides a new perspective for the preparation of low thermal conductivity FC with CO 2 sequestration functionality.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yanling Wang,Yanqi Xu,Haiqing Qin,Cunjun Li,Luwen Tang,Luyang Gan,Hai Wang,Xinyu Wang,Linjiang Wang
Addressing the environmental impact of heavy metal ions and organic dye pollution from industrial processes is a critical challenge for sustainable development. Herein, an innovative approach is reported to sustainable purification of industrial wastewater through the synthesis of magnetic γ-Fe 2 O 3 @NiFe-layered double hydroxides (γ-Fe 2 O 3 @NiFe-LDHs) from wastewater containing various heavy metal ions, which are recovered by a magnetic field and then applied to Rhodamine B (RhB) wastewater treatment. The synthesized γ-Fe 2 O 3 @NiFe-LDHs were proved to possess LDHs characteristics, as confirmed through a comprehensive suite of techniques including X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), X-ray photoelectron spectroscopy (XPS), X-ray absorption spectroscopy (XAS), and electron paramagnetic resonance (EPR) analysis. Remarkably, these γ-Fe 2 O 3 @NiFe-LDHs demonstrate exceptional efficacy in removing high concentrations of heavy metal ions (including Fe, Ni, Cr, Cu, Ca, Al, and Mg), as well as Mn, achieving removal efficiencies of 99.99 % and 97.89 %, respectively, through highly super-stable mineralization process. Meanwhile, the integration of multiple transition metals (Ni, Fe, Cr, Cu, and Mn) within the NiFe-LDHs laminates enables critical electronic cycling for RhB degradation via Fe-based Fenton-like reactions, achieving both cost-effective and highly efficient catalytic performance. Specifically, these γ-Fe 2 O 3 @NiFe-LDHs facilitated the degradation of RhB (100 mL, 50 mg/L) to an impressive 96.44 % without any light irradiation, and notably retained catalytic activity across several reused cycles. This environmentally friendly approach promotes sustainable treatment among different industrial wastewaters and offers great potential for the development of multilevel resource utilization and green environmental management.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Mengli Zhou,Sichan Li,Haojie Tian,Xinyu Liu,Zhimin Wu,Qiying Liu,Jianchun Jiang
Levlinic acid (LA) and its derived γ-valerolactone (GVL) are the two important biomass derived platform molecules, which showed wide application in the fields of fine chemicals, drug and liquid fuel industrials. Considering the coupling of sequential steps for glucose to LA and GVL, selective production of LA and GVL via glucose one-pot conversion in water is an open challenge. Herein, we used metal chlorides as the acidic catalyst for glucose conversion to LA, obtaining the high yield of 77.8 C-mol% over SnCl 4 . Moreover, using the SnCl 4 and Ru/C as the combined catalyst, glucose or cellulose could be converted to GVL with the high yield of 60.1 or 57.9 C-mol% in the case of in situ hydrogenation by formic acid (the by-products during LA formation) decomposition. The formation of LA was responsible for the cooperative effect of BAS (Bronsted acid sites) and LAS (Lewis acid sites) of SnCl 4 for accelerating glucose isomerization, fructose dehydration followed by 5-hydroxymethyl furfural (HMF) rehydration, while the GVL production is relative to the highly efficient formic acid decomposition to H 2 followed by LA hydrogenation to GVL over Ru/C. This study provided an avenue for facile and highly efficient conversion of biomass and the derivatives to LA and GVL using commercial catalysts.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2016
·
IF 3.169
Yan Lin,Guanhong Xu,Fangdi Wei,Aixia Zhang,Jing Yang,Qin Hu
In this present work, a rapid and simple method to detect carcinoembryonic antigen (CEA) was developed by using surface-enhanced Raman spectroscopy (SERS) coupled with antibody-modified Au and γ-Fe 2 O 3 @Au nanoparticles. First, [email protected] reporter and γ-Fe 2 O 3 @Au were prepared, and then modified with CEA antibody. When CEA was present, the [email protected] reporter and immuno-γ-Fe 2 O 3 @Au formed a complex through antibody-antigen-antibody interaction. The selective and sensitive detection of CEA could be achieved by SERS after magnetic separation. Under the optimal conditions, a linear relationship was observed between the Raman peak intensity and the concentration of CEA in the range of 1–50 ng mL −1 with an excellent correlation coefficient of 0.9942. The limit of detection based on two times ratio of signal to noise was 0.1 ng/mL. The recoveries of CEA standard solution spiked with human serum samples were in the range of 88.5–105.9% with the relative standard deviations less than 17.4%. The method built was applied to the detection of CEA in human serum, and the relative deviations of the analysis results between the present method and electrochemiluminescence immunoassay were all less than 16.6%. The proposed method is practical and has a potential for clinic test of CEA.
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PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 7
·3581-3590
·
IF 4.21
Yang Xue,Song Yanliang,Ma Sen,Zhang Xu,Tan Tianwei
A method for isolating components of lignocellulose in hybrid poplar by using an organic solvent (γ-valerolactone) in combination with a solid organic acid ( p -toluenesulfonic acid) is studied here. The combined hydrolysis factor (CHF) was used to measure the severity of the pretreatment conditions and to find the optimal reaction conditions (CHF = 54.99) by judging enzymatic saccharification and characterization of lignin residual. At this pretreatment strength, 91.67% hemicellulose and 86.14% lignin in lignocellulose were effectively removed, and the enzymatic hydrolysis of cellulose residue reached 84.84%. Hemicellulose was hydrolyzed to 4.39 g L −1 of xylose, and a portion was converted to 2.95 g L −1 of furfural and 3.59 g L −1 of acetic acid. The molecular weight, polydispersities and phenolic hydroxyl groups content of the isolated lignin were 1587 g mol −1 , 1.04 and 3.64 mmol g −1 respectively, which indicated that the lignin had the potential to be a phenolic resin material and wood polyurethane foam. In summary, this method effectively separated three components of lignocellulose and obtained high purity cellulose and lignin.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Ming-Jia Guo,Cheng-Cheng Xiang,Yi-Yang Hu,Li Deng,Si-Yu Pan,Chao Lv,Shou-Xiao Chen,Hao-Tian Deng,Cheng-Dong Sun,Jun-Tao Li,Yao Zhou,Shi-Gang Sun
Silicon (Si) is considered to be one of the most suitable anode materials for high energy density lithium-ion batteries due to its high theoretical specific capacity. However, the practical application of Si anode is limited by its huge volume change, leading to the rupture of electrode during cycling. In this study, a natural polymer of poly-glutamic acid ( γ -PGA) is derived from nattomycin gum and poly-acrylic acid (PAA) through thermal cross-linking method and served as a dual force cross-linked binder. The two polymers are firmly bonded by dehydration to form the cross-linked γ -PGA-PAA binder with stable ester bonds, which readily creates hydrogen bonding forces with the hydroxyl groups on Si surface. The γ -PGA-PAA exhibits robust mechanical properties to achieve excellent electrochemical performance of Si-based electrode. When the γ -PGA-PAA is used as binder of Si nanoparticle anodes, the capacity retention of Si/ γ -PGA-PAA electrode can reach 63.1% after 300 cycles at charge/discharge current density of 420 mA g −1 with a mass loading of about 0.7 mg cm −2 . As a comparison, the capacity retentions of the Si/PAA and Si/ γ -PGA electrodes are respectively 8.7 and 17.9% under the same conditions. At higher current density of 2940 mA g −1 , the capacity retention of Si/PAA electrode has dropped dramatically to 23.3%, and the Si/ γ -PGA-PAA electrode keeps still high-capacity retention of 72.5% after 400 cycles, while the Si/ γ -PGA electrode can only last 40 cycles. When the three binders are applied to SiO electrode with 1 mg cm −2 loading, the γ-PGA-PAA binder yields also the highest capacity retention of 87.3% after 100 cycles at 160 mA g −1 , while those corresponding to PAA and γ-PGA binders are 81.3% and 74.9%, respectively. XPS characterization results indicate that the γ -PGA-PAA binder has a strong adhesion to Si particles. This cross-linked binder network of γ -PGA-PAA effectively enhances the cycling performance and maintains the structural integrity of Si and SiO electrodes.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 44
·15918-15926
·
IF 7.393
Zhigang Gao,Luyue Niu,Feifei Zhang,Sikai Wang,Jing Xiao,Jun Chen,Lian Zhang,Jing Ren,Katsuhisa Tanaka
Manipulating the plasmonic properties of metal nanocrystals (NCs) is key to many modern nanophotonic technologies. Here, the strategy of combining Ag+ ↔ Li+ ion exchange and controlled thermal crystallization is proposed as an effective means to prepare transparent nano-glass composites (nano-GCs) embedded with hybrid Ag–metal and γ-Ga2O3:Ni2+ NCs. Only by this method can a large amount of Ag–metal NCs (1.1 mol%) be implanted and well dispersed in the glass matrix without sacrificing their optical transmission properties. The broadband near-infrared (NIR) emission of Ni2+ is enhanced by 100% in the presence of Ag–metal NCs, which is otherwise impossible by raising the Ni2+ concentration due to the limited solubility and intrinsically weak absorption of Ni2+ in nano-GCs. The mechanisms responsible for the enhanced NIR emissions of Ni2+ are comprehensively discussed in the context of both experimental investigations and theoretical simulations. The present study not only provides a promising robust nano-GC-based gain medium for integrated optics but also offers some insights into the plasmonic metal-enhanced photoluminescence for enriched optical functions.
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FUEL
·
2021
·
IF 6.609
Xueying Gao,Xin Yu,Lincai Peng,Liang He,Junhua Zhang
A magnetically-recoverable multifunctional catalyst (Fe 3 O 4 /ZrO 2 @MCM-41) was tailored by the impregnation of ZrO 2 supported on mesoporous MCM-41 coated Fe 3 O 4 nanoparticles, which successfully served as a monolithic catalyst for the cascade conversion of furfural (FAL) giving high yield to γ-valerolactone (GVL), a versatile platform molecule. The ordered hexagonal framework of the parent MCM-41 well reserved after the embedding of Fe 3 O 4 and ZrO 2 . The incorporation of Fe 3 O 4 could not only impart the catalyst with a strong magnetism, but also tune its acidity to promote GVL production. An impressive yield of 85% was accomplished straight from FAL processing with iso -propanol as a hydrogen donor and solvent. The kinetic study demonstrated higher activation energy for levulinate-to-GVL step (86.9 kJ/mol) than FAL transfer hydrogenation (35.0 kJ/mol) and subsequent alcoholysis process (51.0 kJ/mol). The catalyst could be fully recovered by an external magnetic field and showed good reusability. The sustainability of this conversion represents greatly improved by the process intensification based on one-pot reaction, magnetically-recoverable multifunctional catalyst, and mild operating conditions without using gaseous hydrogen.
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