RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2023
·Vol. 67
·期 1
·S78
·
IF 2.1
Han H. J.,Ma J. J.,Xing K. Q.,Shao D. X.,Zhong S. K.
Abstract In this work, the equal-water activities for the ternary system LiCl−KCl−H 2 O and its sub-binary systems LiCl−H 2 O were determined using an isopiestic method at 323.15 K. The determined isopiestic composition lines for the LiCl−KCl−H 2 O system were found to deviated Zdanovskii rule high with increasing ionic strength of the mixture solution. The addition of KCl to an aqueous solution of LiCl was found to decrease and increase the water activity at low and high LiCl molality. The Pitzer–Simonson–Clegg (PSC) model was used to represent the experimental determined water activities of the titled system and the calculated values are discussed. Based on the calculated results, the turning point appears at about 17.0 mol kg −1 LiCl solution.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Lu Dong,Shui Wang,Wenchao Ma,Dongxu Wang,Yixin Qu
In this paper, the solubility of levodropropizine, an important cough suppressant drug, in 13 pure solvents (including 8 alcohol solvents and 5 acetate solvents) was studied with the aid of a laser dynamic solubility-monitor device at a temperature from 283.15 to 323.15 K and atmosphere pressure. In the measured temperature range, the solubility of LVDP increases with increasing temperature and follows the following order: iso-butanol > iso-pentanol > n-hexanol ≈ n-heptanol > n-pentanol > n-propanol > n-butanol > iso-propanol > ethyl acetate > n-propyl acetate > n-butyl acetate > n-pentyl acetate > iso-propyl acetate. Three semiempirical models (modified Apelblat, three-parameter van’t-Hoff, and λh) and two activity coefficient models (Wilson and NRTL) were used to correlate solubility of LVDP as a function of temperature and the mixing thermodynamic properties of the 13 solutions were evaluated based on measured solubility and the parameter values of Wilson’s model.
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Molecular Catalysis
·
2022
·
IF 5.089
Ying Xiong,Xinwei Du,Peng Wang,Xiaogeng Feng,Junshuo Cui,Zhenning Lou,Weijun Shan,Haibiao Yu
This work aimed at elucidating the beneficial effect of the solid-phase grinding method on the catalytic performance of K- x Al for catalyzing γ-valerolactone to butene. Research indicated that a part of Al species was successfully introduced into the framework of KIT-6 support without destroying its original ordered mesoporous structure by the solid-phase grinding treatment method. Hence, Lewis and Brønsted acid sites were formed on the surface of the catalyst. By adjusting the amount of Al species, the content of weak acid sites (100-300 °C) on the catalyst surface can reach as much as 0.31 mmol·g −1 . Through the catalytic activity tested, the K-4Al catalyst exhibited optimum catalytic performance. The GVL conversion rate and butene yield can reach 96.2% and 90.1% at 300 °C, respectively. In addition, the K-4Al catalyst also showed satisfactory renewable performance in cycle tests. These findings will provide useful guidelines for further catalyst design for the preparation of butene from γ-valerolactone.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhao Wang,Yurou Wang,Yuxuan Lin,Gang Bian,Hai-Yang Liu,Xiang Li,Jun Yin,Jian Zhu
Aqueous zinc-ion batteries (ZIBs) have gained wide attention for their low cost, high safety, and environmental friendliness in recent years. β-MnO2, a potential cathode material for ZIBs, has been restricted by its small channels for efficient charge storage. Herein, β-MnO2 nanorods with oxygen vacancies are fabricated by a K+-doping strategy to improve the performance of ZIBs. The assembled batteries exhibit a capacity of 468 mAh g–1, a power density of 2605 W kg–1, and an energy density of 179 Wh kg–1, which outperforms most reported ZIBs. Such a performance is owing to the synergistic combination of the oxygen vacancies in β-MnO2 and concurrent deposition of ε-MnO2 from Mn2+ in the electrolyte. Furthermore, superior cycling stability with negligible capacity decay in these batteries is demonstrated over 1000 cycles at a high current of 2 A g–1. This study reveals the importance of oxygen vacancies and Mn2+ deposition effect in understanding the mechanism of charge storage in MnO2-based ZIBs.
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Crystals
·
2022
·Vol. 12
·期 10
·1339
·
IF 2.67
Hui Han,Ying-Ying Wang,Xing-Chao Yu,Yan-Na Ma,Xuenian Chen
Alkali metal (M = Na, K) salts of the [CB11H12]−anion have attracted increasing attention in many fields such as catalysis and all-solid-state batteries. However, tedious and low-yielding synthetic methods have seriously limited their application in these fields. We developed a facile method for the direct synthesis of the unsolvated potassium and sodium salts of the [CB11H12]−anion in 66% and 68% yields, respectively, by reactions of Na[B11H14] with NaH/NaHMDS (sodium bis(trimethylsilyl)amide), CF3SiMe3in THF and K[B11H14] with KH, CF3SiMe3in DME. This method avoids the exchange of cation and significantly simplifies the reaction setup, thus enabling convenient large-scale synthesis. It is believed that this method will support further application of Na[CB11H12] and K[CB11H12] as solid electrolytes for an all-solid-state battery.Keywords:Na[CB11H12];K[CB11H12];Na[B11H14];K[B11H14];one-pot synthesis
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JOURNAL OF FOOD SCIENCE
·
2022
·Vol. 87
·期 6
·2463-2473
·
IF 3.693
Daojiu Zhang,Huibin Chen,Ledao Zhang,Ji-Li-Te Wang,Steve W Cui,Mingchun Wang,Ji Kang,Biao Wang,Hao Wang
This research aims to prepare capsules emulsion using gallic acid (GA), dextran (DEX), bovine serum albumin (BSA), sodium alginate, and K-carrageenan (K-Car) as the biological delivery system of lycopene. The stability and bioaccessibility of lycopene were further improved through encapsulation of covalent complex of sodium alginate and K-Car. The molecular weight distribution and secondary structure of the conjugates were analyzed by sodium dodecyl sulfate–polyacrylamide gel electrophoresis (SDS–PAGE) and Fourier transform infrared spectroscopy (FTIR). The storage stability of the emulsion stabilized by conjugates was measured with Turbiscan stability index (TSI) and fluctuation of the particle size. The TSI value of ternary conjugates was 18.7 (37℃) with particle sizes ranging from 208 to 319 nm. Then, the changes of three-dimensional reticulate structures and physical properties of sodium alginate-K were analyzed by scanning electron microscopy (SEM) and TPA. The thermal stability of the sodium alginate–K-Car composite systems was increased compared with sodium alginate. The bioaccessibility of lycopene was significantly improved under the dual embedding of BSA–DEX–GA conjugate emulsion and sodium alginate–K-Car composite systems.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Kui Wu,Xiaofang Li,Lingfeng Xu,Runlin Han,Xiaobing Liu,Yajun Li,Dingwa Zhang,Yan Sui
For the design, optimization, and control of the solution crystallization process of diacetone acrylamide (DAAM), solid–liquid equilibrium data in various solvents are critical. In this work, the solubility of DAAM in 15 pure solvents, such as methanol, ethanol, n-propanol, isopropanol, n-butanol, 1-hexanol, isobutanol, n-pentanol, isopentanol, 2-butanone, acetone, ethyl acetate, 2-pentanone, acetonitrile, methyl acetate, and ethyl formate, is analyzed by a gravimetric method under ambient pressure and temperatures ranging from 272.05 to 323.65 K. The solubility values in all of the solvents are positively correlated with temperature. The solubility of DAAM can be satisfactorily correlated by the Apelblat equation, λh equation, nonrandom two-liquid (NRTL) model, and Wilson model, and the calculated solubility agrees well with the measured results. The obtained maximum relative average deviation (RAD) and root-mean-square deviation (RMSD) are 2.44 × 10–2 (n-propanol, NRTL model) and 2.40 × 10–2 (methanol, λh equation), respectively. The most suitable model is the Apelblat equation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Shi Feng,Jing Guo,Fucheng Guan,Jianbin Sun,Xuecui Song,Jiahao He,Qiang Yang
Advances in conductive hydrogels are responding to the emerging need for flexible strain sensors. However, achieving an excellent combination of injectability, conductivity, and sensing characteristics is challenging. For this purpose, suitable 3D printing inks are required to generate hydrogels with the desired morphological and functional characteristics. We composited thermosensitive kC with PVA using borax as a cross-linking agent and a source of conductive ions (Na + ) to obtain borax cross-linked PVA and kC conductive hydrogel inks. And then, the corresponding conductive hydrogels (B-PVA/kC) were successfully prepared using their thermal response behavior and freeze-thaw method. The results show that kC enables B-PVA/kC to undergo a rapid sol-gel transition when cooled from 70 °C to room temperature . The B-PVA/kC hydrogels show a fast, sensitive, and accurate response to movement. After a freeze-thaw cycle (1 F-T), the hydrogels still have good electrical conductivity and strain-sensing properties, with better strength and increased structural stability . More excitingly, this hydrogel can be printed in different shapes to fit the body better and also exhibits good sensing signals when compressed by external forces, which is expected to facilitate the personalization of flexible strain sensors.
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Greenhouse Gases-Science and Technology
·
2023
·Vol. 13
·期 5
·689-698
·
IF 2.2
Xuewei Tu,Luping Zhang,Yutong Chen,Shouxin Zhu,Can Sun,Jiali Jin,Min Liu,Hui Zheng
The conversion of CO 2 into valuable chemicals to reduce greenhouse gas emissions has received extensive attention. Converting CO 2 into pharmaceutical intermediates via graphitic carbon nitride (CN) at atmospheric pressure is a challenge. In this work, a series of novel graphitic carbon nitrides (K-CN) catalysts with different doping ratios of K were synthesized by post-treatment of CN with KOH as a dopant under magnetic stirring. Herein, substrates of o -phenylenediamine with different electron-donating/withdrawing groups were employed to convert CO 2 into high-value heterocyclic benzimidazoles. The optimal reaction conditions were determined by a single factor optimization approach. A series of benzimidazole derivatives were synthesized with a yield of up to 96% under atmospheric pressure, indicating that the catalyst can efficiently fix CO 2 . This work not only designs a simple and low-cost K-CN catalyst but also provides a new pathway for converting CO 2 into valuable benzimidazole derivatives at atmospheric pressure. © 2023 Society of Chemical Industry and John Wiley & Sons, Ltd.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xinghui Wu,Lina Yang,Mingjie Xia,Kejin Yu,Wenqi Cai,Taiyuan Shi,Mengxi Xie,He Liu
The stable energy barrier of mucin and soy hull polysaccharide (SHP) is established at the air/water interface in the intestinal fluid and is conducive to the absorption and transportation of nutrients. This study aimed to investigate the effect of different concentrations (0.5 % and 1.5 %) of Na + and K + on the energy barrier through the digestive system model in vitro . The interaction between ions and microwave-assisted ammonium oxalate-extracted SP (MASP)/mucus was characterized by particle size, zeta potential, interfacial tension, surface hydrophobicity, Fourier transform infrared spectroscopy, endogenous fluorescence spectroscopy, microstructure, and shear rheology. The results showed that the interactions between ions and MASP/mucus included electrostatic interaction, hydrophobic interaction, and hydrogen bond. The MASP/mucus miscible system was destabilized after 12 h, and the ions could improve the system stability to some extent. MASP aggregated continuously with the increase in the ion concentration, and large MASP aggregates were trapped above the mucus layer. Furthermore, the adsorption of MASP/mucus at the interface increased and then decreased. These findings provided a theoretical basis for an in-depth understanding of the mechanism of action of MASP in the intestine.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 30
·期 5
·1995-2006
·
IF 3.667
Shen Jian,Xu Xinyi,Ouyang Xiao-kun,Jin Mi-cong
Based on the excellent performances of nanocrystalline cellulose, sodium alginate, or K-carrageenan in Pb 2+ adsorption, nanocrystalline cellulose/sodium alginate/K-carrageenan composite hydrogel beads were prepared to adsorb Pb(II) from aqueous solutions. The objective of this study was to demonstrate the excellent potential of the composite hydrogel beads for heavy metal ion adsorption. We successfully prepared ecofriendly Fe-modified nanocrystalline cellulose/sodium alginate/K-carrageenan composite hydrogel beads and characterized them. The structure and adsorption mechanism were investigated using scanning electron microscopy, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy, and the optimal adsorption conditions were determined. The tricomponent hydrogel beads were robust and exhibited improved adsorption capacity for Pb 2+ and good reusability. The adsorption results could be fitted well with a pseudo-second-order kinetic model and the Langmuir adsorption model. The maximum adsorption capacity obtained by fitting was 351.04 mg g −1 . Recycling experiments revealed that the adsorption capacity of the adsorbent remained high after five cycles of reuse.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 47
·期 3
·118888
·
IF 6.3
Ji Huang,Liwen Qin,Yang Wu,Jingjing Chen,Xiangdong Ding,Changbai Long,Xue Chen,Laijun Liu
Calcium bismuth niobate (CBNO), known for its high Curie temperature ( T C ), has been investigated as a potential material for vibration sensor due to its ability to operate at elevated temperatures. However, the inherent weakness in piezoelectric response of CBNO has limited its sensing performance. This study successfully induced pseudo-tetragonal distortion in CBNO through the co-doping effects of K/Ce at A site and In/W at B site. This modification altered the interaction between the perovskite layer and the bismuth layer, thereby enhancing both piezoelectric and ferroelectric properties. The co-doped Ca 0.94 (K 0.5 Ce 0.5 ) 0.06 Bi 2 Nb 1.96 (In 1/3 W 2/3 ) 0.04 O 9 exhibits a significantly enhanced piezoelectric coefficient ( d 33 ) of 22.3 pC/N, compared to the 5~7 pC/N for pure CBNO ceramics, and the remanent polarization ( P r ) increased to 11.91 μC/cm 2 , compared to 3.83 μC/cm 2 for CBNO. Furthermore, the sample maintains a suitable resistivity ( ρ = 2.46 × 10 5 Ω·cm) even at 600°C. This work not only deepens the understanding of bismuth layer structure ferroelectrics (BLSFs) but also proposes a viable co-doping strategy, providing an effective approach for developing high-performance, high-temperature-resistant piezoelectric sensors.
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