JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2015
·
IF 2.037
Xiong Zheng,Ying Zhang,Maogang He
The speed of sound in hexane and heptane (mass purity > 0.990, GC) was measured using the Brillouin light scattering method at T = (300.15 to 506.15) K for hexane, (302.15 to 536.15) K for heptane), and p = (1.0 to 8.5) MPa, including saturated liquid, saturated vapor, and compressed liquid. The expanded relative uncertainty (k = 2) of the speed of sound was estimated to be less than 1.0% over the whole investigated range of states. Polynomial representations for the speed of sound in hexane and heptane were fitted to the experimental results. A comparison of the speed of sound data with the correlation shows that, for hexane, the AAD is 0.67% for the saturated liquid, 0.36% for the saturated vapor and 0.57% for the compressed liquid respectively, and for heptane, the AAD is 0.46% for the saturated liquid, 0.38% for the saturated vapor and 0.41% for the compressed liquid, respectively.
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高影响因子
APPLIED GEOCHEMISTRY
·
2017
·
IF 2.581
Wei Zhang,Li Zhou,Hongfeng Tang,Heping Li,Wenlei Song,Gang Xie
The solubility of fluorite in hydrothermal conditions is important in ore forming and geothermal processes and groundwater utilization. However, a quantitative description of the geochemical behavior of fluorite under hydrothermal conditions has not been previously reported. In this work, the solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 M was determined by experiments and modeling. The solubility products obtained in this work at 30 and 50 °C under ambient pressure and those from literature were used to regress the density model parameters for fluorite solubility product calculation at high temperature. The Pitzer interaction model was adopted to calculate the activity coefficient . The fluorite solubility determined in KCl solution at 250 °C under vapor saturated pressure and that from the literature were combined with the low-temperature thermodynamic properties of heat capacity and osmotic coefficient to obtain the binary parameters of NaF and KF at temperatures up to 260 °C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 °C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 °C and 0.1 M NaCl was well predicted. Both temperature and ionic strength had significant effects on fluorite solubility, and fluorite exhibited a similar dissolution pattern in both NaCl and KCl solution. When the concentration was lower than 2 M, the solubility of fluorite first increased with temperature, reached a maximum at approximately 100 °C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wen Lu,Aimin Wang,Yanyu Zhang,Songyu Ren,Zhongguo Zhang
In this work, an innovative strategy combining vacuum ultraviolet (VUV) and K doping graphite carbon nitride (K-g-C 3 N 4 ) was proposed for antibiotic removal in aqueous. The properties of K-g-C 3 N 4 were systematically characterized by XRD, FT-IR, BET, SEM, UV-vis DRS, and XPS, showing that K-g-C 3 N 4 possessed a larger specific surface and richer functional groups than g-C 3 N 4 . The catalytic efficiency of K-g-C 3 N 4 was investigated for the trimethoprim (TMP) removal under VUV irradiation. Compared with UVC photolysis, VUV photolysis, UVC/g-C 3 N 4 , VUV/g-C 3 N 4 , and UVC/K-g-C 3 N 4 processes, VUV/K-g-C 3 N 4 enhanced the pseudo-first-order reaction rate constant of TMP removal by 2.0–19.7 times and the mineralization rate by 9.0%-38.2%. Electron paramagnetic resonance results and quenching experiments validated that O 2 •- , • OH, 1 O 2 , h + , and e - were engaged in the VUV/K-g-C 3 N 4 process. The fluorescent spectra of O 2 •- -substituted and • OH-substituted products revealed that the K-g-C 3 N 4 greatly enhanced the quantity of O 2 •- and • OH during VUV irradiation. The VUV/K-g-C 3 N 4 system produced marginally more H 2 O 2 and • OH than the UVC/K-g-C 3 N 4 system, confirming that K-g-C 3 N 4 predominantly utilized the UVC and other ultraviolet–visible light emitted by the VUV lamp, with VUV having a minor effect. Furthermore, K-g-C 3 N 4 had exceptional stability and reusability, efficiently degrading various contaminants under VUV irradiation. This work offered a comprehensive insight into VUV/K-g-C 3 N 4 process as a novel approach for antibiotic removal from water.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Yi Hua,Jinqiu Ma,Shuaiqi Sun,Qingfen Meng,Dan Li,Yong Ma,Lingzong Meng,Guangli Zhou
The water activities and osmotic coefficients in the ternary system NaB(OH)4–Na2B4O5(OH)4–H2O at 323.15 K were investigated with the isopiestic method. The solubilities and physicochemical properties in the NaBO2–Na2B4O7–H2O system at 323.15 K were studied with the isothermal dissolution equilibrium method. The phase diagram in the system consists of two single salt regions for NaBO2·4H2O and Na2B4O7·10H2O, one invariant point saturated with the above salts, and two univariant solubility curves. On the basis of the Pitzer model, the Pitzer binary parameters of Na2B4O5(OH)4 and mixing parameters were fitted with the osmotic coefficients and solubilities. The dissolution equilibrium constant of Na2B4O7·10H2O was calculated with the experimental solubility data and parameters. The calculated solubilities and water activities with the parameters and dissolution equilibrium constants of NaBO2·4H2O and Na2B4O7·10H2O agree with the experimental data.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qin Liu,Peipei Dang,Guodong Zhang,Hongzhou Lian,Ziyong Cheng,Guogang Li,Jun Lin
Mn2+-doped luminescent materials play a significant role in a variety of fields, including modern lighting, displays, and imaging. Mn2+ exhibits a broad and adjustable emission, hinging on the local environment of the crystal field and the interaction of the 3d5 electrons. However, it is still a challenge to realize the precise control of the emission of Mn2+ ions due to site-prior occupation in a specific lattice. Here, the formation of Mn–Mn dimers is proposed to be an effective strategy to design a novel red emission. Multimode emitters in Mn2+-activated AZn4(PO4)3 (A = K, Rb, and Cs) with unique [Zn4PO12] chains and [ZnOn] groups are observed to achieve regular green and unusual red emissions. KZn4(PO4)3:Mn2+ shows broad dual emissions at 542 and 608 nm, attributed to [MnO4] and [Mn2O7] dimers, respectively. While K is replaced with Rb and Cs, the Zn ions form [ZnO4] tetrahedra and [ZnO5] octahedra. RbZn4(PO4)3:Mn2+ exhibits a broad red emission at 618 nm, ascribing to [Mn2O7] and [Mn2O8] dimers. CsZn4(PO4)3:Mn2+ also displays a broad orange-red emission at 608–620 nm with increasing doping levels, deriving from energy transfer from [MnO5] to [Mn2O7] and [Mn2O8] dimers. This work provides a framework for creating novel red emissions from Mn2+-doped luminescent materials.
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PubMed
高影响因子
BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Haotian Xie,Zhaojiang Yin,Guobin Wei,Binghui Li,Hanfeng Cui,Hao Fan,Jing Zhang
This study developed a dual-mode “on-off-on” sensor based on a bipyridine ruthenium metal–organic framework (Ru-MOF) and dual enzyme cleavage technology for the sensitive detection of the K-ras gene. The sensor combines electrogenerated chemiluminescence (ECL) and fluorescence (FL) detection modes, achieving high sensitivity and specificity in detecting the K-ras gene through catalytic hairpin assembly (CHA) and dual enzyme cleavage reactions. Experimental results showed that the detection limits for the K-ras gene were 0.044 fM (ECL) and 0.16 fM (FL), demonstrating excellent selectivity and stability during detection. Through testing actual samples, the sensor has shown potential for application in complex biological environments. This method offers an efficient and reliable new tool for cancer diagnosis and treatment.
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PubMed
高影响因子
Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 7
·1368-1375
·
IF 0.7
Zhang Xueping,Liu Youquan,Zhou Lang,Pu Junhong
Abstract In this work, the isothermal dissolution equilibrium method was used to investigate the solid-liquid equilibrium of the quaternary system NaBr–KBr–CaBr 2 –H 2 O at 273.15 K. The isothermal solubility of three bromides in aqueous solution was measured, and the dry salt phase diagram and water diagram were constructed. The determination results indicate that the system is a simple co-saturation type, and the equilibrium crystals are all simple salts. The isothermal phase diagram of the quaternary system NaBr–KBr–CaBr 2 –H 2 O at 273.15 K contains three isothermal dissolution lines intersecting at an invariant point. The saturated salts at this point are: NaBr⋅2H 2 O, KBr, and CaBr 2 ⋅6H 2 O. The entire phase space of the dry salt phase diagram is divided into three parts by three isotherms, that is, the crystalline region of NaBr⋅2H 2 O that occupies most, the larger crystalline region of KBr and the narrow crystalline region of CaBr 2 ⋅6H 2 O. The invariant point characteristics of the system at different temperatures were compared, and the Pitzer model was used to theoretically predict the isothermal solubility of the quaternary system at 273.15 K. Since the selected parameters in the calculation program come from the temperature correlation equation reported in the literature, the reliability of the parameters is relatively strong. The predicted value of solubility has a small deviation from the experimental value, and the result proves that the reliability of the experimental data is strong. The results of the phase equilibrium study not only reveal the dissolution and crystallization rules of bromine salts in the brine of oil and gas fields in the Sichuan Basin, but also verify the applicability of the Pitzer model in predicting the solubility of low-temperature bromine-containing system.
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高影响因子
CRYSTENGCOMM
·
2016
·Vol. 18
·期 9
·1655-1664
·
IF 3.849
Dong Yan,Chun-Li Hu,Jiang-Gao Mao
Four new alkali metal boroantimonates, namely, A2SbB3O8 (A = Na, K, Rb) and β-RbSbB2O6, have been synthesized by high-temperature solid-state reactions. Isostructural A2SbB3O8 (A = Na, K, Rb) crystallizes in the monoclinic space group P21/c, with structures featuring a novel 3D anionic framework composed of SbO6 octahedra and linear B3O8 groups with 1D tunnels of Sb4B4 8-membered-rings (MRs) along the a-axis, which are filled by alkali metal ions. β-RbSbB2O6 crystallizes in the polar space group Cc, revealing novel 3D anionic networks composed of SbO6 octahedra chains and B2O5 groups with 1D tunnels of Sb4B2 6-MRs along the b-axis and 1D tunnels of Sb3B4 7-MRs along the c-axis. Studies on their optical properties and thermal stability, band structure calculations based on DFT methods and linear optical calculations have also been performed.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Zilong Cui,Jingling Ye,Liang Yao,Zhi Wang,Ting Wang,Yonghong Hu
In this study, the data on solid–liquid equilibrium of l-prolinamide were studied using the gravimetric method. The solubility of l-prolinamide was measured in ten pure solvents (tetrahydrofuran, n-heptane, n-propanol, acetone, acetonitrile, ethyl acetate, N,N-dimethylformamide, n-hexane, cyclohexane, and isopropanol) and three binary solvent mixtures(ethyl acetate + tetrahydrofuran, n-heptane + ethyl acetate, and n-hexane + acetone) in the temperature range of 278.15–323.15 K at atmospheric pressure. The experimental values showed that the solubility increased with the increase of temperature in all solvents. The solubility data in different pure solvents were fitted using the modified Apelblat model and the Buchowski–Ksiazaczak λh model. For the solubility data of three binary solvent mixtures, the modified Apelblat model, the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) model, and the Jouyban–Acree model were used to fit. In all four models, the modified Apelblat model had a better correlation with the solubility of l-prolinamide weather in pure solvents or binary solvent mixtures. The experimental results showed that n-heptane and n-hexane could be used as antisolvents, which could be used in the purification process of l-prolinamide and guide the large-scale production of many drugs such as Alpelisib in industries.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Chenyang Wen,Xianyang Meng,Kaixin Wei,Jiangtao Wu
The compressed liquid viscosities of 2-methylpentane, 3-methylpentane, and 2,3-dimethylbutane were measured using a vibrating-wire viscometer over the temperature range of (273 to 343) K and at pressures up to 40 MPa. The combined expanded uncertainty of the reported viscosity is about 2% with a confidence level of 0.95 (k = 2). An empirical Andrade–Tait equation was used to correlate the viscosity as a function of temperature and pressure with average absolute percentage deviations of 0.19%, 0.23%, and 0.25%, respectively.
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高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Huanxin Li,Junwei Zhang,Yonghui Dou,Li Xu,Guoji Liu
Data of liquid–liquid equilibria (LLE) for water + 1,6-hexanediamine + 1-butanol and water + 1,6-hexanediamine + 1-pentanol ternary systems were determined at T = 298.2, 308.2, and 318.2 K under atmospheric pressure. The distribution coefficients and selectivity factors calculated from LLE data were applied to evaluate the feasibility and effectiveness of extracting 1,6-hexanediamine from the aqueous solution. The results showed that the selectivity factors decrease with the amount of 1,6-hexanediamine increasing in the aqueous phase, and the effect of temperature is insignificant in this study. The nonrandom two-liquid and universal quasichemical activity coefficient models were also applied to regress the experimental equilibrium data of the two ternary systems and the root mean square deviation values between the correlated and experimental results were lower than 0.7%. It turned out that these phase equilibrium behaviors can be described by the two models. Meanwhile, the binary model parameters were acquired from the relevant process simulations.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Jinqiu Ma,Ziquan Wang,Dan Li,Lingzong Meng,Yafei Guo,Tianlong Deng,Shuaiqi Sun,Yong Ma
The solubilities in the ternary system KCl–CsCl–H2O at 348.15 K were studied with the isothermal dissolution equilibrium method. The phase diagram of the system at 348.15 K is composed of one invariant point, two unvariant curves, and two single-salt crystallizations for KCl and CsCl. A comparison of the diagrams of the system KCl–CsCl–H2O from 298.15 to 348.15 K shows that the solid solution forms at 298.15 K and disappears at 323.15 and 348.15 K. Combining Pitzer binary parameters of KCl and CsCl obtained from the literature and solubility data in the system CsCl–H2O, the temperature dependence equations for Pitzer mixing parameters (θK,Cs and φK,Cs,Cl) and dissolution equilibrium constants of CsCl were built on the basis of the Pitzer model. The model for the mixed system provides reasonable mineral solubility from 273.15 to 348.15 K. The assumption of no solid solution existence in the ternary system can be applied in parameter fitting and solubility calculation. The results on the phase diagrams and thermodynamic model of the system KCl–CsCl–H2O can supply basic thermodynamic data and theoretical references for CsCl separation from the brine containing KCl.
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