JOURNAL OF MOLECULAR LIQUIDS
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2018
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IF 4.513
Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yu Pan
The solubilities and refractive indices of the NaBr–SrBr 2 –H 2 O and KBr–SrBr 2 –H 2 O systems at 288.15 K were investigated with the isothermal dissolution method. The phase diagrams and refractive index diagrams were plotted for the two systems at 288.15 K. The phase diagrams consist of one two-salt cosaturated invariant point , two univariant solubility isotherms, and two stable crystallization fields. The two systems belong to the simple eutectic type, and neither double salt nor solid solution was found. The refractive indices change regularly with the strontium bromide concentration increasing in solution, and reach the maximum value at the eutectic point. On the basis of Pitzer and Harvie-Weare (HW) model, the binary and mixing Pitzer parameters and solubility equilibrium constants of equilibrium solid salts for the two ternary systems at 288.15 K were acquired. And then, the solubilities for the ternary systems at 288.15 K were demonstrated. A comparison shows that the calculated solubilities agree well with the experimental data.
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FUSION ENGINEERING AND DESIGN
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2024
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IF 1.9
Meng She,Jianming Nie,Xiaoyan Shu,Lin Feng,Jun Tang,Bo Huang
Bubble strengthened materials have received lots of attention in recent years, and among them, potassium-doped tungsten (W-K) is extremely desirable for very high-temperature applications such as plasma-facing materials in fusion reactors. However, it is difficult to fabricate ultrafine-grained W-K bulk materials by traditional methods. In this study, a novel preparation method of ultra-fine-grained bubble-strengthened material is presented. Unlike traditional routes, W-K mixed powder was prepared by evaporating and condensing pure K on the surface of nanoscale W powder. Two W-K mixing methods using this evaporation-condensation route were developed. Mechanical milling process combined with regular SPS sintering were carried out on the W-K mixed powder, which successfully manufactured ultrafine-grained (0.9 μm) W-K bulk material with a high density (96.4%). This study can provide important reference for the fabrication of other bubble-strengthened materials.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2019
·Vol. 103
·期 2
·1018-1026
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IF 3.094
Xuefang Luo,Ziyang Hou,Tianliang Zhou,Rong-Jun Xie
Mn 4+ -activated fluoride red-emitting narrow-band phosphors have been successfully used in wide color-gamut white LEDs for liquid crystal display (LCD) backlights. However, highly concentrated and toxic HF is usually used in their synthesis, causing environment and safety issues. In this work, we proposed a HF-free green method, that is, using NH 4 F/HCl instead of HF, to synthesize a series of A 2 X F 6 :Mn 4+ ( A = K, Na, Rb, Cs; X = Si, Ge, Ti) phosphors. The microstructure, photoluminescence (PL) properties, thermal quenching, and applications of the synthesized phosphors were investigated. Using the proposed approach, the phosphors generally showed a pure phase, a particle size ranging from 5 to 45 μm, and some characteristic sharp emission lines of Mn 4+ in the red spectral range. The internal quantum efficiency was varied in a broad range of 69%-94% under the 460 nm excitation, depending on the composition of the fluoride host. Among these compositions, K 2 X F 6 :Mn 4+ ( X = Ge and Ti) phosphors even had a similar external quantum efficiency (>60%) with commercial ones. By combining K 2 GeF 6 :Mn 4+ (narrow-band red) and β -sialon:Eu 2+ (narrow-band green) with a blue LED, a white light-emitting diode (wLED) backlight with a color gamut of 87.7% National Television System Committee Standard, color temperature of 8423 K, and a luminous efficacy of 110.8 lm/W was demonstrated. These results indicate that the synthetic method proposed in this work is universal for preparing highly efficient fluoride phosphors used in wLEDs.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
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IF 2.4
Pengqi Hou,Jibin Song,Hongliang Wu,Shuaishuai Lu,Hongkang Zhao,Qunsheng Li
The solubility of 3,5-dimethylbenzoic acid (3,5-DMBA) in 11 pure solvents and ethanol + ethyl acetate binary mixtures was measured using the static equilibrium method combined with gravimetric analysis at temperatures from 293.15 to 333.15 K. Solubility increased with temperature in all systems. In pure solvents, the order was cyclohexanone > n-butanol > isopropanol > acetone > n-propanol > ethanol > isobutanol > n-propyl acetate > ethyl acetate > isopropyl acetate > acetonitrile. In binary mixtures, solubility exhibited a maximum at an ethanol mass fraction of 0.4. Experimental data were correlated with the modified Apelblat, van’t Hoff, λh, NRTL, Wilson, and UNIQUAC models; the modified Apelblat equation yielded the best fit. KAT-LSER analysis indicated the contributions of α, β, π*, and δH to the solubility of 29.48%, 4.04%, 39.44%, and 27.04%, respectively. Thermodynamic functions of mixing derived from the Wilson model showed endothermic mixing in acetonitrile, isopropyl acetate, and cyclohexanone, and exothermic mixing in the others. ΔSmix increased with temperature, ΔGmix remained negative (spontaneous), and the dissolution driving force shifted from entropy- to enthalpy-dominated with increasing temperature. The order of ΔGmix was inverse to solubility. These findings offer theoretical support for optimizing industrial crystallization of 3,5-DMBA and solvent-temperature selection.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2026
·
IF 4.5
Haoyang Zhang,Binyu Wang,Junyao Pan,Yufei Wang,Junhui Guo,Qinhe Pan,Yanze Du,Wenfu Yan
Direct synthesis of HEU zeolite from non-alkali-activated spent FCC catalyst. • K + -directed seed-assisted crystallization enables selective HEU formation. • Seed crystals accelerate nucleation by shortening the induction period. • FCC-derived HEU exhibits abundant exchange sites for Pb 2+ removal. • Waste-derived HEU provides a sustainable platform for ion-exchange applications. The direct valorization of spent fluid catalytic cracking (FCC) catalysts into high-value zeolitic materials remains challenging because conventional conversion routes generally require alkali activation, complex pretreatments, or organic structure-directing agents. Herein, we report a direct and reproducible synthesis of HEU -type zeolite from non-alkali-activated spent FCC catalyst through a K + -directed seed-assisted hydrothermal strategy. In this approach, KOH serves as the sole alkali source, while synthetic HEU seeds promote nucleation and regulate framework formation. The optimized synthesis conditions (2.3 K 2 O: Al 2 O 3 : 8.0 SiO 2 : 440 H 2 O, 13 wt% seed loading, 160 °C, 72 h) yield highly crystalline HEU zeolite without the use of organic structure-directing agent (OSDA) or alkali activation. Systematic investigation of the crystallization field reveals that K + plays a critical structure-directing role by stabilizing the building units required for HEU formation, whereas seed crystals shorten the induction period and accelerate nucleation. After Na + exchange, the resulting Na-FCC-HEU exhibits excellent Pb 2+ adsorption performance, including >99.8% removal efficiency at a low solid-to-liquid ratio of 1/1000, rapid adsorption equilibrium within 35 min, broad pH tolerance (3–7), strong resistance toward competing ions, and a maximum adsorption capacity of 215.1 mg g −1 at 80 °C. The superior adsorption behavior originates from the low Si/Al ratio and abundant exchangeable sites of FCC-derived HEU . This work provides a sustainable route for converting industrial waste into functional zeolitic materials and offers new insights into the crystallization chemistry of HEU zeolite. We developed an energy-efficient, economical, and reproducible route for high value-added HEU zeolite synthesis from non-alkali-activated spent FCC catalyst, which exhibited excellent performance in removing Pb 2+ pollution after Na + modification by ion-exchange. Download: Download high-res image (276KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Yue Wu,Hong Chen,Zhuo Chen,Qingling Guan,Shirui Zhang,Yuhao Huang,Yang Xiao,Yun Liao,Liangshu Xia,Fang Wang
Photocatalytic extraction of uranium from wastewater presents an attractive route for environmental remediation as well as sustainable nuclear energy, aligning with the carbon peaking and carbon neutrality goals. However, conventional g-C₃N₄-based photocatalytic systems suffer from fast electron-hole recombination. To address the challenge, this work innovatively constructed a photocatalytic material using a strategy of K/S co-doping coupled with cyano functionalization. It demonstrated superior U(VI) photocatalytic extraction efficiency, strong anti-interference capability against coexisting ions and excellent recyclability. An extraction efficiency of 95.7% for U(VI) was attained without any sacrificial agent or protective gas. The results indicated the synergy of K/S doping combined with cyano functionalization tailored the band structure and generated high localized electron density. The large molecular dipole induced a built-in electric field (BEF) promoting oriented photo-excited electron movement and thereby enhancing U(VI) photocatalytic extraction. Ultimately, U(VI) ions were enriched on the photocatalyst via deposition of (UO 2 )O 2 ·2H 2 O, driven synergistically by photogenerated electrons and ·O₂ − . This research presents a novel and effective approach for recovering uranium resources from wastewater through photocatalysis.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Yu Dong,Tiantian Ping,Xiaoqin Shi,Shufeng Shen
Nonaqueous amine-based blends have great potential for energy-efficient CO 2 absorbent. In this work, densities and viscosities were measured for liquid binary mixtures of 2-(ethylamino)ethanol (EAE) and 2-(butylamino)ethanol (BAE) with 2-butoxyethanol (EGBE) at temperatures of (293.15–353.15)K over the entire concentration range and atmospheric pressure. Intermolecular interactions between EGBE and two secondary amines with different carbon chain length were discussed. The excess molar volume ( V E ), viscosity deviations ( ∆η ) and excess Gibbs free energy ( ∆G ⁎ E ) were calculated from the experimental data and also correlated with the Redlich-Kister equation to estimate the binary interaction parameters. The experimental data and the calculated from the proposed correlations for the studied binary mixtures matched well each other, with AADs within 0.01% and 1.45% for density and viscosity respectively. The variation of excess properties was also discussed in terms of intermolecular interactions. Weak interactions on mixing these binary mixtures with different mass fractions were observed from the FTIR spectra analysis.
研究领域:
化学工程
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热力学
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流体物理化学
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气体吸收
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分离科学
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2026
·
IF 2.1
Jiazuo Wei,Bowen Tan,Bolun Yang,Jingjun Liu
To identify suitable extractants for extractive enhanced glycerol-CO2 carbonylation, liquid–liquid equilibrium data were determined for glycerol–glycerol carbonate systems with 2-pentanone, cyclohexanone, and 4-methyl-2-pentanone at 423.2, 433.2, and 443.2 K under a pressure of 1.5 MPa. The efficacy of the three extractants in the extraction of glycerol carbonate from glycerol was evaluated using distribution coefficients and extractive selectivity. Among the extractants, cyclohexanone possessed the highest distribution coefficient (>1) and superior extraction capability, while 4-methyl-2-pentanone exhibited the best selectivity for glycerol carbonate over glycerol. The liquid–liquid equilibrium data were then correlated using the Non-Random Two-Liquid (NRTL) model, and the corresponding binary interaction parameters were determined. The regressed parameters effectively reproduced the phase equilibrium trends observed for all studied systems. This work provides fundamental data and parameters for the selection of extractant to enhance the glycerol-CO2 carbonylation through extractive reactions as well as for subsequent process development and optimization for the carbonylation.
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JOURNAL OF CHEMICAL THERMODYNAMICS
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2022
·
IF 3.269
Lingyan Gui,Dongdong Li,Jiangtao Wu,Xianyang Meng
The apparent molar heat capacities of LiBO 2 (aq), NaBO 2 (aq), KBO 2 (aq), Na 2 B 4 O 7 (aq) and K 2 B 4 O 7 (aq) solutions at molalities from 0.01 to 2.6 mol·kg −1 , and at temperatures T = (298.12, 313.13 and 328.14) K have been determined using a Picker flow calorimeter built in this work. Further, the standard heat capacities of these solutes were derived from the experimental data by extrapolation to infinite dilution using the Pitzer ion-interaction model. The group contribution method is used to calculate the standard molar heat capacities of tetraborate ion in three equilibria for different assumptions, among which the prediction on the assumption that the standard molar heat capacity of reaction for the association reaction is zero is the most reasonable, and the results are in good agreement with the experimental data.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2022
·
IF 3.119
Shaohua Lv,Yun Hao,Bohao Yang,Linghong Tang
In this article, a calorimeter was established on the basis of steady-flow calorimetry. The present calorimeter was utilized to measure the isobaric heat capacity (cp) of target fluids. First, water was measured to verify the reliability of the experimental system. Then the measurements of cp for methyl hexanoate and ethyl hexanoate were carried out at temperatures from 313 K to 433 K and pressures of up to 10 MPa. To implement easier industrial application, a correlation was proposed on the basis of the experimental data to calculate the cp values of methyl hexanoate and ethyl hexanoate, with maximum absolute relative deviations of 0.77% and 0.65%, respectively. The newly reported data will be helpful for use with methyl hexanoate and ethyl hexanoate.
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Hui Lu,Xiaoran Li,Feng Li,Xiuquan Xu,Rong Zhao,Chenyi Xiong,Qing Hu,Zhuoqing Miao,Miao Tian
Photocatalytic technique has been widely accepted as a promising and effective candidate for eliminating antibiotic and pathogen pollutants in aquatic environment. Herein, a novel O, K co-doped g-C 3 N 4 photocatalyst embedded with single-atom Ag (denoted as Ag/OKCN) was successfully constructed to achieve the enhanced photocatalytic degradation and disinfection efficiency under visible light irradiation. The optimal Ag/OKCN-6 could eliminate 80.4 % of tetracycline (TC) within 60 min with a rate constant of 0.0259 min −1 , which was 4.98 times of pristine g-C 3 N 4 . Meanwhile, Ag/OKCN-6 could also completely inactivate>7-log CFU·mL −1 of Escherichia coli ( E. coli ) by efficient disruption of cell membranes. The synergistic effect of O, K co-doping and single-atom Ag embedding contributed to an extended light response, preeminent separation and transfer of photoexcited charges, prolonged carrier lifetime as well as ameliorative hydrophilicity, which was conducive to the excellent photocatalytic performance. Radical trapping and electron spin resonance (ESR) experiments validated that superoxide radicals ( • O 2 − ) were crucially responsible for the superior photocatalytic activity. This work provides a facile route to construct multi-strategy modified g-C 3 N 4 -related photocatalysts for efficiently eliminating aquatic environmental pollutants.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Xiaomei Qin,Yapei Chen,Shihao Yang,Xiaoyun Qin,Jianbo Zhao,Wenjun Fang
Measurements on densities, viscosities, and refractive indices at atmospheric pressure for binary mixtures of 1,3-dimethyladamantane (1,3-DMA), 1,3,5-trimethyladamantane (1,3,5-TMA), and 1-ethyladamantane (1-EA) with n-nonane or n-undecane are carried out over the whole composition range at temperatures T = 293.15–343.15 K and atmospheric pressure. The excess molar volume (VmE), deviation in viscosity (Δη), deviation in refractive index (ΔnD), and deviation in molar refraction (ΔR) for the six mixtures are calculated and then fitted to the Redlich–Kister polynomial. The VmE values are all negative over the entire range of mole fractions and decrease with increasing temperature for the six binary systems. The absolute values of Δη for the mixtures decrease obviously with increasing temperature. The ΔnD values with the volume fraction for the six systems are all positive over the entire composition range. Density, viscosities, and refractive index of the six systems are correlated by the Jouyban–Acree model. The experimental results could be useful for the development of high-energy-density hydrocarbon fuels.
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