FLUID PHASE EQUILIBRIA
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2019
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IF 2.514
Kai Kang,Shanshan Zhu,Xiaodong Liang,Georgios M. Kontogeorgis,Xiaopo Wang
In this work, the liquid densities of n -decane/ o -xylene mixtures were measured at four different component proportions, the mole fractions of n -decane are 0.2001, 0.4065, 0.5835, and 0.8041, respectively. The measurements were performed based on the high-pressure vibrating-tube densimeter , and the measured temperatures were from 283.15 K to 363.15 K and the pressures were from 0.1 MPa to 60 MPa. The Tammann-Tait equation was used to correlate the experimental densities, and the simplified Perturbed Associating Fluid Theory (sPC-SAFT) and Cubic Plus Associating (CPA) equation were used to predict the high-pressure densities of the mixtures with the binary interaction parameters. Derived properties, including isothermal compressibilities and isobaric thermal expansivities, were calculated from Tait equation, sPC-SAFT equation, and CPA equation, respectively. In addition, excess molar volumes of the considered mixtures were obtained and the effects of pressure and temperature on the excess molar volume were discussed.
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RSC Advances
·
2014
·Vol. 4
·期 29
·14979-14984
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IF 3.708
Meng Deng,Bo Su,Hui Zhang,Yuxiu Liu,Qingmin Wang
A concise and efficient enantioselective strategy to synthesize two typical phenanthroindolizidine alkaloids, 14-hydroxyantofine and antofine, was developed, featuring an asymmetric deprotonation/diastereoselective carbonyl addition sequence during which the formation of a chiral C-13a center and connection of pyrrolidine and phenanthrene moieties were achieved efficiently in one step. The absolute configuration of the C-13a stereocenter can be delicately controlled by using different enantiomers of sparteine, both of which are commercially available.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaolin Liu,Tian Tian,Aifeng Liu,Zengcai Guo,Jingbo Mu,Xiaoliang Zhang,Xuan Yue,Xiaoyan Liu,Fei Gao,Hongwei Che
Herein, nitrogen-doped carbon (NC) encapsulated CoP hollow spheres are designed and prepared through a sodium L-aspartate assisted carbonization-oxidation-phosphorization route. Experimental and theoretical analysis unveil that the encapsulating of NC results in improved electric conductivity and enhanced electrolyte wettability. Particularly, an interfacial charge redistribution induces the establishment of local electric field at the CoP/NC interface, which leads to a decrease in surface OH – adsorption energies, an enhancement in charge transfer efficiency between OH – and active materials, and a reduction in OH – diffusion energy barriers. Thus, the CoP@NC electrode materials demonstrate enhanced capacity values (998C g −1 at 2 A g −1 and 640C g −1 at 20 A g −1 ) and cyclic stability (a capacity retention of 92.7 % after 5000 cycles). Moreover, three-dimensional macroporous N-doped carbon foams (MNCFs) are prepared through a facile and eco-friendly strategy using sodium L-aspartate as N-containing carbon source. Such MNCFs possess large surface area, enhanced electrical conductivity, and high-efficiency mass and ion transport, thus achieving specific capacitances of up to 426F g −1 at 1 A g −1 and 325F g −1 at 10 A g −1 . Furthermore, the fabricated CoP@NC||MNCFs hybrid supercapacitor device delivers an energy density of up to 75.1 Wh kg −1 at 800 W kg −1 , and demonstrates a capacity retention of 93.8 % after 5000 cycles. Our work not only provides valuable insights but also opens new avenues for designing and constructing advanced electrode materials for high-efficiency energy storage applications.
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高影响因子
JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
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2015
·
IF 2.729
Miaomiao Tian,Yongcun Zou,Shaoyan Zhou,Tianpeng Wang,Xueju Lv,Qiong Jia
Novel magnetic adsorbents based on Fe 3 O 4 /SiO 2 /poly(acrylamide- N , N' -methylene bisacrylamide) magnetic microspheres modified with non-ionic triblock copolymer surfactant were successfully prepared as a magnetic solid phase extraction adsorbent for the determination of trace natamycin in jam samples. The adsorbent was characterized by scanning electron microscopy, transmission electron microscopy, Fourier transformed infrared spectroscopy, vibrating sample magnetometer, and X-ray diffractometer analysis, confirming that Pluronic L64 was effectively functionalized on the magnetic materials. Various experimental parameters affecting the extraction capacity were investigated including adsorbent amount, extraction time, desorption time, sample pH, and ionic strength. For recovery evaluations, the jam samples were spiked at two concentration levels of 100 and 200 μg kg −1 of natamycin and the recovery values were in the range of 78.8–93.4%. The relative standard deviations (RSD) for the recoveries were less than 3.5%. The novel magnetic solid phase extraction method provided several advantages, such as simplicity, low environmental impact, convenient extraction procedure, and short analysis time when used for natamycin analysis.
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiaoe Dang,Sining Yun,Yongwei Zhang,Jingjing Yang,Zhuolei Liu,Changwei Dang,Yinhao Wang,Yingying Deng
With the increasing energy demands and impending climate change, significant concerns have been raised over the metal–organic frameworks (MOFs)-derived porous carbons and their utilization for hydrogen evolution reaction (HER) and triiodide reduction reaction (IRR). However, the provision of high intrinsic activity, active-site accessibility, and structural stability of MOF-derived Co-embedded N-doped carbon (Co/N-C) for HER and IRR is challenging. In this work, core-shell MOF-in-MOF precursors are designed to construct novel double-shell N-C-in-Co/N-C electrocatalysts with nanorod- and rhombic dodecahedron-shaped hollow morphologies (NR-H-C and RD-H-C). The double-shell structured NR-H-C and RD-H-C significantly enhance the HER and IRR activity of Co-MOF-derived Co/N-C. Specifically, NR-H-C achieves a high N-content (10.35 at.%), large specific surface area (590.87 m 2 g −1 ), and hierarchical porous configuration (micropores and mesopores). When NR-H-C is applied as the HER catalyst in alkaline electrolyte, it exhibits an admired overpotential of 123 mV at 10 mA cm −2 and a Tafel slope of 51 mV dec −1 . The solar cell adopting NR-H-C as counter electrode for IRR achieves a high short circuit current density of 16.77 mA cm −2 , an open-circuit voltage of 0.745 V, a fill factor of 0.682, and a power conversion efficiency of 8.51%, higher than that of Pt-based solar cell (16.26 mA cm −2 , 0.744 V, 0.602, and 7.28%). The elucidatory Volmer-Heyrovsky HER mechanism and reversed Volmer-Heyrovsky IRR mechanism give a better understanding of the enhanced dual-functional activity of NR-H-C. This work provides an essential information for the rational design of high-performance dual-functional HER and IRR catalysts and further open up a new avenue for the construction of multicomponent MOFs in the energy conversion field.
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TETRAHEDRON
·
2018
·
IF 2.377
Qing-He Wang,Zhong-Xiang Zhu,Tiao Huang,Ming-Shu Wu
A new rearrangement of isatin-derived N,N′-cyclic azomethine imines to afford intermediate 3-hydroxy-1H-pyrazole -substituted oxindole was found, and then Michael addition of them to a vinyl bisphosphonate ester provided 3,3-disubstituted oxindole-fused pyrazolidone derivatives containing bisphosphonates in the presence of the readily available DMAP. This transformation is particularly attractive due to features such as unexpected rearrangement, mild conditions, atom economy, the ready availability of the starting materials.
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Journal of Water Process Engineering
·
2023
·
IF 7
Fangke Yu,Xiaochun Xu,Jing Yang
In this study, precursor ultrathin molybdenum disulfide nanosheets and ZIF-67 was selected to prepare Co and N co-doped porous carbon by the support of Mo (MoS 2 /Co@NPC) to activate peroxymonosulfate (PMS) for perfluorooctanoic acid (PFOA) degradation. The morphology, crystal form and composition of MoS 2 /Co@NPC are studied by scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and other methods. In MoS 2 /Co@NPC/PMS process, PFOA was completely degraded in 180 min at pH 7, 0.3 g/L catalyst, 0.1 mM PMS and reaction temperature of 25 °C. The degradation efficiency was much higher than that in other systems. The oxidative species for PFOA degradation was studied using free radical quenching experiments and electron paramagnetic resonance (ESR) tests. SO −4 plays a major role in the degradation of PFOA, OH plays an auxiliary role, and 1 O 2 contributes the least. The effect of different types and positions of cobalt‑nitrogen and molybdenum atoms on the electrocatalytic activity was investigated by density functional theory (DFT) calculations. The co-doping of Co and N into carbon-based materials can synergistically enhance by Mo for the activation of PMS. The unsaturated S atoms on the surface of metal sulfides can trap protons to form H 2 S while exposing the reducing metal active site, which also accelerates the rate-limiting step of the Co 3+ /Co 2+ conversion. The core-shell structure of Co@NPC doped with Mo has the characteristics of improving the electron transfer ability of carbon, promoting the mass transfer of reactants, and preventing cobalt metal agglomeration and metal dissolution. The degradation pathways of PFOA were investigated and three possible pathways were proposed. In addition to PFOA, MoS 2 /Co@NPC-800/PMS system can also remove contaminant in pharmaceutical wastewater, indicating that the process has potential application value in practical wastewater treatment .
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Leikai Ye,Fangyan Chen,Yubin Tang,Wenqian Sun,Yanhua Song
At present, the rapid, sensitive, and highly selective detection of trace organic contaminants is a research spot in the field of environment. Herein, a novel fluorescent nanoprobe N, S-CDs@MIP based on N/S co-doped carbon quantum dots (CDs) coupled with amoxicillin molecularly imprinted polymer was synthesized. The fluorescent property of N, S-CDs@MIP and fluorescence quenching level of amoxicillin to N, S-CDs@MIP was explored. Furthermore, the fluorescence analysis method based on N, S-CDs@MIP probe for quantitatively detecting amoxicillin was established. The synthesized N, S-CDs@MIP has a maximum fluorescence emission wavelength of 440 nm and a significantly selective fluorescence response toward amoxicillin with a large imprinting factor of 4.07. For the developed fluorescence analysis method, the detection limit, the linear range of the standard curve, and relative standard deviation (RSD) were obtained as 1.17 ng/mL, 5.8–200 ng/mL, and <3 %, respectively. The real environmental water samples were measured with a high accuracy with the recovery of 83.6 % ~ 104.7 % and RSD of 2.3 % ~ 5.1 %. Compared to the HPLC-UV, HPLC-MS, and the fluorescence detection method based on CDs or doped CDs, the established fluorescence detection method exhibits high selectivity, wide linear range, and low detection limit. It is greatly promising in the quick detection of trace amoxicillin.
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CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yan Runhan,Cui Hongmin,Shi Jinsong,Yan Nanfu,Weng Yaqing,Cheng Ting,Wang Wei
There are still challenges in the recovery of rare earth elements (REEs) from leaching liquor of ion-adsorption type rare earth ore. In this paper, unsaponified N, N-di(2-ethylhexyl)-diglycolamic acid (HDEHDGA) was used to develop a green extraction process for efficient separation and enrichment of REEs. The cation exchange mechanism of RE(III) extraction was proposed by slope analysis and FT-IR spectra. HDEHDGA exhibited excellent extraction performances, such as short equilibrium time, high selectivity towards RE(III) and easy stripping by 0.5 mol/L HCl solution. REEs was enriched from 287.5 mg/L to 63.30 g/L by five-stage counter-current extraction and three-stage counter-current stripping using unsaponified HDEHDGA. The enrichment factor reached 220, and the proportion of REEs was increased from 80.76 wt% to 98.82 %. The loss of REEs was controlled below 2.14 wt%. This extraction strategy helps to improve the REEs recovery and avoid ammonia–nitrogen wastewater, which demonstrates its application potential in the ion-adsorption type rare earth ore.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wei Li,Qian Liu,Xun Zhang,Yingfeng Wang,Maoli Yin,Xuchen Tao
This study mainly aimed to reveal the superiority of the positively charged poly( N , N -dimethyl acrylamide) (PC-PDMAA)/poly(ethyl acrylate) (PEA) structure to control poly(sodium allyl sulfonate) (PSAS)/PEA structure in enhancing the sizing properties (viscosity stability, adhesion to fibers (cellulose-based cotton and hydrophobic polyester), and film properties) and desizability of starch, and avoid desizing difficulty issue of positively charged PATAC-grafted starch, due to its worse desizing efficiency. Also, it aimed to survey the influence of grafting ratio on these properties, to develop a new biobased starch adhesive, PC-PDMAA- g -starch- g -PEA (PC-PDMAA- g -S- g -PEA), for the sizing of cotton and polyester. Under a similar grafting ratio, the PC-PDMAA- g -S- g -PEA (IV) showed significantly superior bonding to both fibers, film elongation and endurance ( p < 0.05), and better paste stability and desizability compared to control PSAS- g -starch- g -PEA (PSAS- g -S- g -PEA, IV # ). This demonstrated that combining the PC-PDMAA/PEA branches could further enhance these properties of acid-thinned starch (ATS) compared to the PSAS/PEA branches. Bonding strengths, viscosity stability, desizability, film elongation, and film endurance of PC-PDMAA- g -S- g -PEA were strengthened with an increased grafting ratio from 0 % to 10.80 %. According to these findings, PC-PDMAA- g -S- g -PEA, a novel starch bio-based adhesive with a grafting ratio of 10.80 %, showed promise for use in cotton and polyester warp sizing.
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PubMed
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CHINESE JOURNAL OF POLYMER SCIENCE
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2025
·
IF 4
Qian Yu-Ke,Feng Shao-Bo,Song Zi-Yuan
The preparation of polypeptide materials in continuous flow reactors shows great potential with improved reproducibility and scalability. However, conventional polypeptide synthesis from the polymerization of N -carboxyanhydride (NCA) is conducted at relatively slow rates, requiring long tubing or ending up with low-molecular-weight polymers. Inspired by recent advances in accelerated NCA polymerization, we report the crown-ether-catalyzed, rapid synthesis of polypeptide materials in cosolvents in flow reactors. The incorporation of low-polarity dichloromethane and the use of catalysts enabled fast conversion of monomers in 30 min, yielding well-defined polypeptides (up to 30 kDa) through a 20-cm tubing reactor. Additionally, random or block copolypeptides were efficiently prepared by incorporating a second NCA monomer. We believe that this work highlights the accelerated polymerization design in flow polymerization processes, offering the continuous production of polypeptide materials.
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FOOD MICROBIOLOGY
·
2026
·
IF 5.4
Liangliang Gao,Tengjie Li,Zengrong Xiong,Mingnan You,Jun Zhang,Nengguo Tao
In this study, N'-(4-fluorophenyl)-2-pyridinecarbohydrazide (2-FPH), N'-(4-fluorophenyl)-3-pyridinecarbohydrazide (3-FPH), and N'-(4-fluorophenyl)-4-pyridinecarbohydrazide (4-FPH), which showed considerable antifungal activities against the prochloraz-resistant Penicillium italicum strain (PiR2), were designed and synthesized. Among these, 2-FPH displayed the strongest antifungal activity against PiR2 growth, with minimum inhibitory concentrations (MIC) of 12.5 μg/mL and minimum fungicidal concentrations (MFC) of 25 μg/mL. In vivo antifungal and hemolytic toxicity tests showed that 2-FPH effectively prevented PiR2 infection of citrus fruits, but exhibited exceptionally low hemolytic toxicity. At equivalent concentrations, its biological safety and control efficacy were far superior to those of prochloraz. According to morphological findings, 2-FPH increased cell membrane permeability, caused cell swelling and morphological abnormalities, disrupted structural integrity, and decreased chitin content in cell walls. Physiological, biochemical, and molecular biology investigations indicated that 2-FPH binds to succinate dehydrogenase (SDH), inhibits its enzymatic activity, and suppresses associated gene expression. This decreases intracellular ATP levels, disrupts normal mitochondrial function, and triggers a substantial increase in reactive oxygen species (ROS). In summary, 2-FPH shows promising potential as a possible fungicide and succinate dehydrogenase inhibitor for managing citrus blue mold.
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