MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 6
·1-9
·
IF 5.7
Liu Cheng,Guo Ping,Lu Yan-Rui,Zhu Yu-Lan,Ran Xiao-Yan,Wang Bang-Jin,Zhang Jun-Hui,Xie Sheng-Ming,Yuan Li-Ming
The manufacturing of chiral covalent triazine framework core-shell microspheres CC-MP CCTF@SiO 2 composite is reported as stationary phase for HPLC enantioseparation. The CC-MP CCTF@SiO 2 core-shell microspheres were prepared by immobilizing chiral COF CC-MP CCTF constructed using cyanuric chloride and (S)-2-methylpiperazine on the surface of activated SiO 2 through an in-situ growth approach. Various racemates as analytes were separated on the CC-MP CCTF@SiO 2 -packed column. The experimental results indicate that 19 pairs of enantiomers were well separated on the CC-MP CCTF@SiO 2 -packed column, including alcohols, phenols, amines, ketones, and organic acids. Among them, there are 17 pairs of enantiomers that can achieve baseline separation with good peak shapes. Their resolution values on this chiral column are between 0.4 and 5.61. The influences of analyte mass, column temperature, and composition of the mobile phase on the resolution of enantiomers were studied. In addition, the chiral resolution ability of CC-MP CCTF@SiO 2 -packed column was compared with the commercial chiral chromatographic columns (Chiralpak AD-H and Chiralcel OD-H columns) and some CCOF@SiO 2 chiral columns (β-CD-COF@SiO 2 , CTpBD@SiO 2 , and MDI-β-CD-modified COF@SiO 2 ). The CC-MP CCTF@SiO 2 -packed column exhibited some unique advantages and can complement these chiral columns in chiral separations. The research results show that the CC-MP CCTF@SiO 2 chiral column offered high column efficiency (e.g., 17680 plates m −1 for ethyl mandelate), low column backpressure (5–9 bar), high enantioselectivity, and excellent chiral resolution ability for HPLC enantioseparation with good stability and reproducibility. The relative standard deviations (RSD) ( n = 5) of the retention time, and peak areas by repeated separation of ethyl mandelate are 0.23% and 0.67%, respectively. It demonstrates that the CC-MP CCTF@SiO 2 core-shell microsphere composite has great potential in enantiomeric separation by HPLC. Graphical abstract
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COLLOID AND POLYMER SCIENCE
·
2023
·Vol. 301
·期 8
·989-999
·
IF 2.4
Hu Tao,Xu Weichuan,Li Dong,Wang Song,Wang Yuxiang,Wu Caijin,Tan Liqiang
Extensive use of Al 2 O 3 nanoparticles in consumer and industrial products has led to concerns about their potential environmental impacts in the recent years. In most studies concerning Al 2 O 3 aggregation and disaggregation, more was to consider the single factor that influences their environmental behaviors. Understanding the combined abiotic factors that influence the fate, transport, and stability of nanoparticles in a complex aquatic system has become extremely important. Here, we reported and analyzed the major abiotic factors such as typical solution pH, electrolyte cations in different valences (Na + and Ca 2+ ), and the presence of humic acid (HA) that influence the stability, aggregation, and disaggregation behaviors of Al 2 O 3 nanoparticles in a complex aquatic system. Dynamic light scattering technique combined with fluorescence spectroscopic analysis was used to explore the aggregation mechanisms. Experimental results indicated that Al 2 O 3 nanoparticle stability was mainly controlled by the steric hindrance, van der Walls, and electrostatic interactions between HA and Al 2 O 3 nanoparticles. Aggregation kinetics and attachment efficiency studies induced by the addition of Na + and Ca 2+ cations confirmed that divalent electrolytes could reduce the large energy barrier between the charged colloidal particles more efficiently, and induce a more aggressive aggregation of the particles. Additionally, the bridging effect of HA with Ca 2+ was also an important mechanism for the aggregation enhancement, which had been confirmed by the fluorescence excitation-emission matrix (EEM) spectra analysis. These findings are useful in understanding the environmental challenges of inorganic colloidal particles in natural environments.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 30
·75247-75261
·
IF 5.8
Sun Qing,Hu Xiaofang,Zhao Yingjie,Zhang Jian,Sheng Jiawei
Dissolved antibiotics have been a research subject due to their widespread presence and potential threats in drinking water treatment. To enhance the photocatalytic activity of Bi 2 MoO 6 for the degradation of norfloxacin (NOR), the heterostructured Co 3 O 4 /Bi 2 MoO 6 (CoBM) composites were synthesized by employing ZIF-67-derived Co 3 O 4 on Bi 2 MoO 6 microspheres. The as-synthesized resultant material 3-CoBM by 300 °C calcination was characterized by XRD, SEM, XPS, transient photocurrent techniques, and EIS. The photocatalytic performance was evaluated by monitoring different concentrations, NOR removal from aqueous solution. Compared with Bi 2 MoO 6 , 3-CoBM exhibited the better adsorption and elimination capacity of NOR due to the combined effect between peroxymonosulfate activation and photocatalytic reaction. The influences of catalyst dosage, PMS dosage, various interfering ions (Cl − , NO 3 − , HCO 3 − , and SO 4 2− ), pH value, and type of antibiotics for application removal were also invested. By activating PMS under visible-light irradiation, 84.95% of metronidazole (MNZ) can be degraded within 40 min, and NOR and tetracycline (TC) can be completely degraded using 3-CoBM. Degradation mechanism was elucidated by quenching tests in combination with EPR measurement, and the degree of activity of the active groups from strong to weak is h + , SO 4 - •, and •OH, respectively. The degradation products and conceivable degradation pathways of NOR were speculated by LC-MS. In combination of excellent peroxymonosulfate activation and highly enhanced photocatalytic performance, this newly Co 3 O 4 /Bi 2 MoO 6 catalyst might be a promising candidate for degrading emerging antibiotic contamination in wastewater.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 26
·68467-68476
·
IF 5.8
Yu Kun,Guo Jiaqi,Li Bing,Guo Jianzhong
Sorption is prominent in low price, high efficiency, availability, and eco-friendliness. Organic porous materials have the characteristics of easy functionalization, diverse structure and stability, and show great potential in adsorption, energy storage, catalysis, and other fields. A mesoporous phenolic resin-type polymer (PRP) was successfully synthesized and modified by solid state reaction with maleic anhydride to prepare adsorbent (called as PRP-MAH) for sorption of Pb 2+ . The impact of reaction conditions (the pH value, reaction temperature, fresh concentration of solution, ionic strength and reaction time, etc.) was systematically studied. Characterization methods such as SEM, FTIR, and XPS indicated that the synthesized adsorbent PRP-MAH had regular morphology and good stability. The fitting of isothermal adsorption experiment data conforms to Langmuir sorption isotherm, and the sorption capacity reached 366.40 mg·g −1 at 308 K. The kinetic data were consistent with the quasi-second-order model, which indicated that the chemisorption might play the main role in the sorption process. Thermodynamic research manifested that the sorption of Pb 2+ by PRP-MAH was carried out by a spontaneous process at the study temperature. The studies show that PRP-MAH can remove Pb 2+ from water solution through ion exchange, electrostatic attraction, and surface complexation.
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AQUACULTURE INTERNATIONAL
·
2023
·
IF 2.9
Liu Guoqing,Zhou Meng,Mao Xiangjie,Gu Dianchao,Chen Wangwang,Long Xianmei,Xie Shouqi,Tan Qingsong
The
objective of this study was to evaluate the nutritional value of Clostridium autoethanogenum protein (CAP) as a sole protein source at different dietary protein levels by growth performance, health status, and intestinal microbiota of grass carp. Grass carp (4.56 ± 0.01 g) were randomly divided into 6 treatments in triplicate (30 fish per replicate) and fed with gradient protein level (24.45%, 27.31%, 31.82%, 35.79%, 38.64%, and 42.82%, respectively; named CAP1, CAP2, CAP3, CAP4, CAP5, and CAP6) diets for 8 weeks. Final body weight (FBW) and specific growth rate (SGR) were the significantly highest in the CAP4 group ( P < 0.05). Based on SGR and feed efficiency (FE), the dietary protein requirement for juvenile grass carp was estimated to be 36.14–37.90%. CAP4 promoted hepatopancreatic health by reducing lipid deposition and structural lesions, and improved the anti-inflammatory ability by upregulating the relative expression level of il10 ( P < 0.05). At the same time, the CAP4 improved the length of mucosal fold and the thickness of muscular layer. In addition, CAP4 can maintain the composition and metabolic function of intestinal microbiota and enhance the endocrine system and bacterial chemotaxis. However, it is worth noting that increasing CAP inclusion depressed hepatopancreatic antioxidant capacity. In conclusion, CAP is a promising novel protein source for grass carp, while careful consideration of its side effect at high inclusion level is deserved.
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International Journal of Environmental Science and Technology
·
2023
·
IF 3.1
Yang X.,Mao L.,Shuai H.,Rong Q.,Zhang S.,Lu H.
Fuchsin acid (FA) and other organic dye contaminants have a great harm to the environment and organisms. It is of importance to develop suitable materials with simple preparation process, low cost and excellent performance, for the purification of polluted water. Layered double hydroxides (LDH), as a kind of efficient anion adsorption materials, can be reused simply, but with poor solid–liquid separation efficiency. Herein, the magnetized modified CaAl-LDH (designated as M-CaAl-LDH) was successfully prepared by using cheap compounds such as CaO, AlCl 3 and Fe 2+ /Fe 3+ under the ultrasound-assisted co-precipitation condition. The crystal structure, surface morphology, and elemental compositions were characterized by XRD, FTIR-ATR, SEM–EDS, for the as-prepared LDH materials. The optimized results of removal effect for FA in the simulated sewage show that the removal rate was reached 92.15%, when 0.5 g M-CaAl-LDH was added to the simulated solution with initial pH = 7.5 after adsorption time of 60 min. As for CaAl-LDH before and after magnetic loadings, it is also found that the elimination capacity of M-CaAl-LDH is slightly lower than CaAl-LDH, which may be resulted from the loading of minor amounts of magnetic nano-Fe 3 O 4 with poor removal ability. Graphical Abstract
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CELLULOSE
·
2023
·Vol. 30
·期 10
·6507-6521
·
IF 5.7
Fan Lingling,Zheng Wenfeng,Yang Yuan,Sun Yan,Peng Songlin,Xu Jie,Yin Guangfu
Bacterial cellulose (BC)/polypyrrole (PPy) nanofibrous composites have been extensively studied in supercapacitors owing to their large specific surface area and excellent tensile strength. However, the inferior cycling stability due to structural pulverization of PPy impedes their potential applications. Herein, nanofibrous composite membranes of MXene, PPy and oxidized BC (TOBC) were prepared for flexible supercapacitor electrodes. The C6 primary hydroxyl groups of BC nanofibers were oxidized into aldehyde or carboxyl groups. Due to the enhanced interaction of TOBC with PPy and MXene, the TOBC nanofibers were horizontally wrapped on the MXene nanosheets and PPy was homogeneously deposited on the TOBC nanofibers. The flexible solid-state supercapacitors fabricated with the MXene@TOBC@PPy (TMP) electrodes achieved an areal specific capacitance of 928.9 mF cm −2 at 0.7 mA cm −2 and a capacitance retention of 85.5% after 5000 cycles. Therefore, the TMP electrodes could be a promising electrode material for flexible supercapacitors.
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GLYCOCONJUGATE JOURNAL
·
2023
·Vol. 40
·期 4
·435-448
·
IF 3
Bai Ruifeng,Wang Jingyi,Brockhausen Inka,Gao Yin
The presence of N -glycolylneuraminic acid (Neu5Gc), a non-human sialic acid in cancer patients, is currently attributed to the consumption of red meat. Excess dietary red meat has been considered a risk factor causing chronic inflammation and for the development of cancers. However, it remains unknown whether Neu5Gc can be generated via a chemical reaction rather than via a metabolic pathway in the presence of high levels of reactive oxygen species (ROS) found in the inflammatory and tumor environments. In this study, the conversion of N -acetylneuraminic acid (Neu5Ac) to Neu5Gc has been assessed in vitro under conditions mimicking the hydroxyl radical-rich humoral environment found in inflammatory and cancerous tissues. As a result, Neu5Gc has been detected via liquid chromatography-multiple reaction monitoring mass spectrometry. Furthermore, this conversion has also been found to take place in serum biomatrix containing ROS and in cancer cell cultures with induced ROS production.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9446-9458
·
IF 4.5
Cheng Zhipeng,Yin Jingzhou,Chu Xiaozhong,Yang Tingting,Gao Yuan,Zhong Hui,Zhang Lili
Transition metals (TMs) have an excellent catalytic effect on the thermal decomposition of ammonium perchlorate (AP). However, nanosized TM catalysts tend to agglomerate due to their high surface energy and magnetism. In this work, a new Fe/Al composite catalyst was synthesized by loading Fe nanoparticles onto Al powder through a facile replacement route, and its effect on the thermal decomposition stability of AP and AP-based propellants was investigated. Morphological and structural characterization showed that Fe nanoparticles were successfully decorated on the Al surface without noticeable aggregation or shedding. The diameter of Fe nanoparticles was approximately 10 nm. The constructed Fe/Al composite catalyst presented a strawberry-like structure. Elemental mapping analysis revealed that the dispersion state of the Fe/Al composite catalyst was better than that of commercial Fe nanoparticles with AP. Thermal analysis indicated that the Fe/Al composite catalyst presented excellent catalytic stability in the high-temperature decomposition (HTD) of AP, reducing the HTD temperature by approximately 100 °C. Burning tests showed that the relative standard deviations of the burning rate with the Fe/Al composite catalyst were 2.5 and 2.2% at 5 and 10 MPa, respectively, whereas those with Fe reached 17.1 and 13.9% at 5 and 10 MPa, respectively. The Fe/Al composite catalyst inherited the good dispersion of Al, effectively resolving the problems of Fe nanocatalyst agglomeration. Therefore, the as-obtained Fe/Al composite catalyst can significantly improve the thermal decomposition stability of AP and AP-based propellants and will have wide application prospects in the field of AP-based propellants.
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JOURNAL OF SOLUTION CHEMISTRY
·
2023
·Vol. 52
·期 9
·1048-1065
·
IF 1.2
Li Dan,Zheng Yingdi,Jin Yang,Li Yixin
The fundamental physical properties including density, viscosity and refractive index have been measured for binary mixtures of four fatty acid ethyl esters mixed with diethyl carbonate (DEC) over the entire composition range at temperatures T = (293.15 to 323.15) K and normal atmospheric pressure. The values of excess molar volume, viscosity deviation and refractive index deviation are calculated and the effects of temperature and composition on the variation of excess properties are discussed. All of the values of excess molar volume and refractive index deviation are observed to be positive and the values of viscosity deviation are negative. The excess or deviation properties have also been evaluated and fitted to the Redlich–Kister equation with satisfied results.
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Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 3
·1-12
·
IF 20.1
Dang Hui,Kong Qianqian,Winchester William,Wan Xin,Lei Yu,Zhang Haisheng,Zhao Yu,Liu Xinyu,Xu Ben Bin,Zhang Baoshan,Wang Zhe
Auricularia auricula , one of the most important edible mushrooms, is affected heavily by Trichoderma . We collected the diseased samples from the main A. auricula cultivation regions to characterize the pathogen and study the effect of Trichoderma spp. on A. auricula species. We identified one Trichoderma species, T. pleuroticola , based on the internal transcribed spacer and morphology characteristics, and two types of A. auricula strains, Heiwei 15 (HW 15) and Hei 29 (H 29), were tested in this work. The growth rate of T. pleuroticola was 3.26–3.52 times higher than that of A. auricula and advantageously competed for living space and nutrients. In confrontation culture, T. pleuroticola completely inhibited the mycelium growth of A. auricula and grew on it, resulting in a diverse impact on HW 15 and H 29. In addition, T. pleuroticola can produce metabolites with antibacterial activity. The inhibition rate of volatile metabolites to H-29 and HW 15 was 13.46% and 10.44%, and the inhibition rate of nonvolatile metabolites to H-29 and HW 15 was 36.04% and 31.49%, respectively. Further analysis showed that these antifungal activities inhibiting Auricularia auricula growth were mainly attributed to the organic compounds from T. pleuroticola , nonanal, tyrosine, beta-sitosterol, and wortmannin. In short, T. pleuroticola was a highly pathogenic fungi in the production of A. auricula . Graphical Abstract T. pleuroticola can affect the normal growth of A. auricula hypha, and its metabolites also have inhibitory effects on A. auricula hypha.
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Carbon Letters
·
2023
·
IF 4.5
Li Guochun,Li Jiaxin,Yang Ziyu
This study reports the synthesis of a novel graphene/chitosan/β-cyclodextrin composite material (GO/CS/β-CD) via a one-step chemical reduction method, which combines the advantages of graphene, chitosan, and β-cyclodextrin. The morphology and structure of the composite were characterized using various techniques, such as scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy. Subsequently, sortase A (SA) was immobilized onto the GO/CS/β-CD for the detection of Staphylococcus aureus . The sensor exhibited a good linear relationship within the concentration range of 30–300 CFU/mL, with a detection limit of 12 CFU/mL. The GO/CS/β-CD composite material showed enhanced properties due to the synergistic effect of graphene, chitosan, and β-cyclodextrin. The immobilization of sortase A onto the composite material improved the sensitivity and selectivity of the sensor for the detection of S. aureus . This study presents a novel graphene/chitosan/β-cyclodextrin composite material with immobilized sortase A, demonstrating enhanced sensitivity and selectivity for the detection of Staphylococcus aureus, which has potential for the development of high-performance sensors in various fields.
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