INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Qing Yin,Jiali Liu,Zicheng Zhong,Yueyuan Zhang,Feiran Zhang,Mingming Wang
In this study, chitosan (CS) and phytic acid (PA) were employed as raw materials to synthesize a range of chitosan–phytic acid complexes (CP) with different ratios (CS:PA = 12:1, 9:1, 6:1, 3:1, 1:1). The structures and elemental compositions of the compounds were characterized using Fourier-Transform Infrared Spectroscopy (FT-IR) and Scanning Electron Microscopy with Energy-Dispersive X-ray Spectroscopy (SEM-EDS). The thermal stability of the synthesized materials was analyzed using a Thermogravimetric Analyzer (TG). Electrochemical testing was conducted to explore the corrosion inhibition effect of the modified inhibitors with varying ratios on Q235 steel in 3.5 wt% NaCl solution. Additionally, Scanning Electron Microscopy (SEM) was utilized to investigate the surface morphology of the immersed samples. When the CS:PA ratio was 3:1, CP exhibited an impressive corrosion inhibition efficiency of 94.9 %. Furthermore, the antimicrobial properties of CP were evaluated using the colony plate counting method. At a CS:PA ratio of 1:1, CP demonstrated the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) at 0.1250 % and 0.5000 %, respectively. This research introduces a novel green corrosion inhibitor capable of simultaneously reducing the electrochemical corrosion of Q235 while inhibiting biocorrosion, avoiding the antagonistic effects arising from the simultaneous use of biocides and corrosion inhibitors in the system.
研究领域:
材料科学
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腐蚀工程
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生物技术
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化工工程
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高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 4
·1169-1175
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IF 1.1
Qu Yafen,Yu Yanling,Huang Biwu
[2-(3,4-epoxy-cyclohexyl)ethyl]dimethyltert-butylsilane was synthesized, using tert-butyldimethylsilane (TBDMS) and 1,2-epoxy-4-vinylcyclohexane (EVC) as the main raw materials and tris(triphenylphosphine) chlororhodium(I) [RhCl(Ph 3 P) 3 ] as the catalyst. [2-(3,4-epoxy-cyclohexyl)ethyl] dimethyltert-butylsilane is a novel kind of silicon-containing epoxide. The factors affecting the reaction yield, such as catalyst use, reaction time and reaction temperature, were investigated, and the synthesized product was characterized and analyzed by FT-IR and 1 H-NMR. A series of amine-curing resins were prepared with [2-(3,4-epoxy-cyclohexyl)ethyl]dimethyltert-butylsilane, bisphenol A epoxy resin (E-51) and modified amine (593 amine). The mechanical properties of cured splines with the different proportions of amine-curing resins were tested. When the content of 593 amine was 20%, the content of E-51 was 75% and the amount of [2-(3,4-epoxy-cyclohexyl) ethyl] dimethyltert-butylsilane was 5%, the mechanical properties of the cured splines were the best with the tensile strength being 23.3 MPa, the elongation at break being 7.8%, and the Young’s modulus being 421.3 MPa.
研究领域:
高分子化学
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材料科学
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有机合成
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化学工程
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高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-12
·
IF 3.8
Yang Bing,Liu Baoliang,Gao Yuanyuan,Wei Junjie,Li Gang,Zhang Hui,Wang Linlin,Hou Zhaosheng
This study developed a kind of PEG-crosslinked O-carboxymethyl chitosan (O-CMC–PEG) with various PEG content for food packaging. The crosslinking agent of isocyanate-terminated PEG was firstly synthesized by a simple condensation reaction between PEG and excess diisocyanate, then the crosslink between O-carboxymethyl chitosan (O-CMC) and crosslinking agent occurred under mild conditions to produce O-CMC–PEG with a crosslinked structure linked by urea bonds. FT-IR and 1 H NMR techniques were utilized to confirm the chemical structures of the crosslinking agent and O-CMC–PEGs. Extensive research was conducted to investigate the impact of the PEG content (or crosslinking degree) on the physicochemical characteristics of the casted O-CMC–PEG films. The results illuminated that crosslinking and components compatibility could improve their tensile features and water vapor barrier performance, while high PEG content played the inverse effects due to the microphase separation between PEG and O-CMC segments. The in vitro degradation rate and water sensitivity primarily depended on the crosslinking degree in comparison with the PEG content. Furthermore, caused by the remaining –NH 2 groups of O-CMC, the films demonstrated antibacterial activity against Escherichia coli and Staphylococcus aureus . When the PEG content was 6% (medium crosslinking degree), the prepared O-CMC–PEG −6% film possessed optimal tensile features, high water resistance, appropriate degradation rate, low water vapor transmission rate and fine broad-spectrum antibacterial capacity, manifesting a great potential for application in food packaging to extend the shelf life.
研究领域:
材料科学
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食品科学
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化学
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生物技术
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DOI
PubMed
高影响因子
Foods
·
2024
·Vol. 13
·期 6
·932
·
IF 4.7
Yan Gou,Donglin Gu,Jing Fan,Jianbo Yang,Ke Zan,Jingjing Liu,Hongyu Jin,Ying Wang,Feng Wei,Shuangcheng Ma
Polygonum multiflorumThunb. (PM) and derived products are broadly utilized in Chinese traditional medicine. According to our previous research, PM mostly contains polysaccharides, which display a wide range of biological activities. Two water-soluble polysaccharides (PMPs-1 and PMPs-2) were obtained from PM by DEAE-Cellulose and Sephadex G-100 column chromatography. Colorimetry, HPGPC-MALLS-RID, HPLC-PDA, methylation, FT-IR, NMR, and SEM were used to characterize these polysaccharides. PMPs-1 and PMPs-2 had average molecular weights of 255.5 and 55.7 kDa, respectively. PMPs-1 consisted of Man, Glc, Gal, and Ara at 0.9:78.6:1.0:1.6 and was a glucan with → 4)-Glcp-(1 → as a backbone. Meanwhile, PMPs-2, an acidic polysaccharide, comprised Rha, GalA, Glc, Gal, and Ara at 3.2:20.3:2.7:1.0:8.3. PMPs-1 and PMPs-2 significantly improved the proliferation of RAW 264.7 cells and induced NO, TNF-α, and IL-6 release. This study reveals that these two polysaccharides can be explored as novel immunomodulators and provide a basis for further development of PM in food and pharmaceutical industries.
研究领域:
药理学
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免疫学
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生物化学
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中医
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PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Wenfei Zhao,Wen Wang,Yixuan Wu,Wenhui Guo,Wenzhuo Ren,Shiyu Meng,Shaojun Yun,Cuiping Feng
In this study, a spent mushroom substrate (SMS) from Lentinus edodes cultivation was used to prepare biochar (BC) and magnetic biochar (MBC) at high temperatures. The magnetic field strength of MBC was proved via VSM analysis. The results of the nitrogen adsorption‒desorption isotherms of BC and MBC showed that MBC exhibited stronger adsorption, and SEM was performed to compare the microstructures of BC and MBC. TEM was performed to compare the distributions of C, O, and Fe. The FT-IR and XRD results revealed changes in the structure and the formation of new substances after magnetization; that is, MBC was more conducive to the adsorption and recovery of pesticides. Moreover, a method for the detection of tetramethrin, beta-cypermethrin, and fenvalerate in water samples (tap water, lake water, and river water) was established, and this method combined the use of MBC as adsorbent and high-performance liquid chromatography. Moreover, great linearity of the method was obtained in the range of 0.5–2.5 μg/mL; the recoveries in real samples were in the range of 70.20–73.32%, and the RSDs were in the range of 0.22–1.09%. The method is simple and effective, is suitable for the detection of pyrethroids in water, and has certain application potential.
研究领域:
环境科学
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分析化学
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材料科学
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农业科学
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Zishuang Guo,Menghui Deng,Haiwang Wang,Xiao Xiang,Chengang Zhang,Bingzhu Wang
In this paper, the microstructure evolution of polymeric carbon nitride was investigated and Au ions was used to improve its photocatalytic efficiency. Their structures were investigated by FT-IR, XPS, XRD , SEM and TEM. Their specific surface area and aperture distribution were measured by BET. Meanwhile, the energy band structure and electron-hole separation efficiency were analyzed by UV–Vis and PL spectroscopy. In addition, the photocatalytic performance of the photocatalysts was assessed by photocatalytic degradation of RhB and photocatalytic hydrogen evolution . The results showed that 600-PCN possessed the best photocatalytic performance, with a degradation rate of 46.92 % in 150 min. What's more, the degradation rate of RhB solution by 2 % Au/PCN reached 47.88 %, which was 2.17 times higher than that of 550-PCN (22.01 %). During the degradation process, h + oxidatively degrade RhB. The hydrogen production rate of 2 % Au/PCN was about 11.658 μmol/g/h, which was 41.23 times higher than that of 550-PCN (0.282 μmol/g/h).
研究领域:
材料科学
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化学
·
催化
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纳米技术
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环境科学
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 47
·期 3
·1216-1225
·
IF 3.925
Anqi Niu,Hang Xu,Qinlin Yuan,Fengmin Wu,Xuefeng Wei
Lewis acidic ionic liquid-loaded Fe3O4@SiO2 magnetic catalytic microspheres were prepared. When coupled with persulfate, the microspheres catalytically oxidized and removed dibenzothiophene (DBT) from octane. The microspheres used for catalytic desulfurization were characterized and analyzed by SEM, TEM, FT-IR, VSM, and TG-DTA. The results indicated that the prepared catalytic desulfurization microspheres had a uniform particle size distribution, an overall diameter of 200 nm, and a core diameter of Fe3O4 of about 180 nm. The saturation magnetization of the catalytic desulfurization microspheres was 39.8 emug−1, which allowed them to be rapidly magnetically separated. The optimal experimental conditions were 1.5 g catalyst, 1.2 g PMS (20%) oxidant, 30 °C, an initial sulfur content of 500 ppm, 6.0 g octane, and 3.0 g acetonitrile. Under these conditions, the desulfurization rate reached 98.5% after 25 min, which decreased by about 10% after five recycles. GC-MS analysis indicated the oxidation product was dibenzothiophene sulfone (DBTO2). In the desulfurization mechanism, DBT was first extracted by acetonitrile. Then, in the acetonitrile phase, Co2+ catalyzed hydrogen persulfate to form active oxygen atoms that oxidized DBT and eventually formed DBTO2.
研究领域:
化学工程
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环境科学
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材料科学
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分析化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Feng-Ying Wu,Yan Cheng,Xin-Yue Yuan,Qi-Lei Sun,Fu-Min Xue
The study investigated the extraction of alkaloids and glycosides from the Camptotheca acuminata Decne using deep eutectic solvent (DES). 18 types of deep eutectic solvents (DESs) were prepared, and it was found that the extraction performance of choline chloride (ChCl)-formic acid (FA) was optimal, surpassing traditional solvents such as methanol/70 % methanol. In comparison to methanol, the extracted amount of compounds by DES was 2–3 times higher. The extraction processes involving the molar ratio of ChCl-FA, pH, DES/H 2 O mass ratio, solid/liquid ratio, as well as ultrasonic power were optimized. A mathematical model for solid/liquid extraction kinetics from Camptotheca acuminata Decne was developed. The extraction mechanism was investigated using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and 1 H nuclear magnetic resonance( 1 H NMR). The results revealed that the DES caused dissociation in Camptotheca acuminata Decne and formed hydrogen bonds with Camptothecin (CPT). Meanwhile, density functional theory (DFT) calculations verified that FA-based exhibited the highest extracted amount for CPT. In addition, this study investigated the recovery rate of DES, and the results showed that after 10 cycles, the DES system remained effective for the extraction of alkaloids and glycosides.
研究领域:
药学
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分析化学
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植物化学
·
提取技术
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高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2019
·
IF 4.067
Sai Kumar Tammina,Yang Wan,Yanyan Li,Yaling Yang
A simple and one-step microwave digestion method was utilized to synthesize the highly photoluminescent glucosamine derived nitrogen and zinc doped carbon dots (N, Zn-CDs) with a bluish-green luminescence property. The synthesized N, Zn-CDs inherited a good photoluminescence property with a quantum yield of 74% and which were characterized by XPS , XRD , TEM , FT-IR, UV–Vis, and fluorescence spectrometry . More importantly, N, Zn-CDs served as a fluorescence sensor for the detection of Fe 3+ ions, under optimal conditions, a good linear relationship was established in the concentration range of 0.25–125 μM. Also, the experimental results showed the detection limit of N, Zn-CDs against Fe 3+ was 0.15 μM, this could be a promising assay for sensing Fe 3+ ions. Also, the role of zinc doping was explored by conducting the detection under similar experimental conditions in the absence of zinc, and reports revealed that the reason for high photoluminescence was due to the zinc doping. Along with the sensing application, our group had investigated the bactericidal property of synthesized N, Zn-CDs against gram-negative ( Escherichia coli ), and gram-positive pathogens ( Staphylococcus aureus ). N, Zn-CDs displayed good bactericidal activity against both pathogens under light conditions, but Escherichia coli , even under the dark condition proved its activity. Besides, the morphology of both the strains was displayed before and after the treatment via a scanning electron microscopic images. Also, a plausible mechanism for bactericidal activity was also explained. The reported synthesis method could provide a novel approach for the design of high photoluminescent N, Zn–CDs with good sensing and bactericidal property towards Fe 3+ ions, gram-negative and positive bacterial strains .
研究领域:
材料科学
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分析化学
·
微生物学
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2022
·Vol. 331
·期 2
·889-902
·
IF 1.754
Fu Xibiao,Liu Jun,Ren Zheng,Zhang Siqin,Xiao Fangzhu,Peng Guowen
Metal-organic frameworks (MOFs) MIL-101(Cr)-PMIDA with phosphate groups were prepared for the adsorption of U(VI). The morphology and structure of the samples were characterized by SEM, TEM, FT-IR, BET, XPS and XRD. This study investigated the effects of the initial U(VI) concentration, contact time, pH, adsorption temperature and coexisting ions on the adsorption of U(VI) by MIL-101(Cr)-PMIDA. The experimental results showed that the adsorption capacity of MIL-101(Cr)-PMIDA was 267.92 mg g −1 at C 0 (U) = 40 mg L −1 , pH = 6.0 and T = 298 K, which was much higher than that of MIL-101(Cr)-NH 2 (71.10 mg g −1 ). More importantly, the material exhibited excellent selective removal performance for U(VI) in an aqueous solution. Furthermore, adsorption thermodynamics and kinetic studies showed that the adsorption was spontaneous (∆G < 0) and exothermic (∆H ˃ 0), following the pseudo-second-order kinetic model (R 2 > 0.99). Graphical abstract
研究领域:
化学
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材料科学
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环境科学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Haoyu Yue,Zhijie Shang,Pan Xu,Dongyue Feng,Xinxue Li
A novel EDTA functionalized chitooligosaccharide/sodium alginate/Ca 2+ physical double network hydrogel (ECSDNH) was prepared by using of high-salinity oilfield produced water. The formation and structure of ECSDNH were characterized by FT-IR and SEM. Various factors, including EDTA functionalized chitooligosaccharide content, pH of solution, initial concentration of heavy metal ions, temperature and contact time, were thoroughly investigated to explore their effect on adsorption capacity of ECSDNH. The obtained results showed that ECSDNH had higher adsorption capacity for Zn 2+ , Ni 2+ and Mn 2+ . The maximum adsorption capacities of Zn 2+ , Ni 2+ and Mn 2+ were 160.19 mg/g, 72.67 mg/g and 52.43 mg/g at 298 K, respectively. The pseudo-second-order kinetic model and Langmuir isotherm model fit the experimental data fairly well. The thermodynamic parameters of the adsorption, Δ H ° , Δ S ° , and Δ G ° , were also calculated. In addition, the ECSDNH still had higher removal efficiency for three metal ions after three adsorption-regeneration cycles, indicating its potential application for removing heavy metal ions from wastewater.
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
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·
IF 3
Yuhan Chen,Nian Yin,Yunfei Wang,Shanjun Gao,Chunhui Shen
A novel bio-based carbon forming agent (Mg@PA-CS) containing P and N elements was were synthesized using the complexation characteristics of chitosan (CS) and phytate (PA). The flame retardant behavior of poly(lactic acid) (PLA)/Mg@PA-CS/APP composites (addition of 20 wt% of different ratios of Mg@PA-CS and APP to polylactic acid composites) were investigated by the limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimetry test (CCT), and thermogravimetric analysis (TGA). Due to the biphasic flame retardant and synergistic effect, since the 20 wt% flame retardant system (Mg@PA-CS:APP = 1:2), PLA composites passed the UL-94 test V-0 rating, reached 34% LOI value. The peak heat release rate (PHRR) and total heat release rate (THR) were reduced to 1/2 of the pure PLA, char residue could be as high as 11.49% at 800°C. Moreover, the flame-retardant mechanism of PLA composites during thermal decomposition was analyzed using a scanning electron microscope (SEM) and the coupling techniques of TGA linked with FT-IR (TG-FTIR).
研究领域:
材料科学
·
高分子科学
·
消防安全工程
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高影响因子
危险品化学品经营许可证（带存储）