JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Dandan Gao,Dongdong Li,Wu Li
Solubility of RbCl(cr) and CsCl(cr) in pure water were determined at subzero temperatures. The solubility of RbCl(cr) and CsCl(cr) decreased with temperature increment. Specific heat capacity of RbCl(aq) and CsCl(aq) solutions were determined at 298.15 K and concentration to near saturation. The specific heat capacity of RbCl(aq) and CsCl(aq) solutions decreased with concentration increment and for the same molality the specific heat capacity of CsCl(aq) is smaller than that of RbCl(aq). A temperature dependent thermodynamic model based on the Pitzer-Simonson-Clegg activity coefficient equations was used to represent the activity, thermal and solid-liquid equilibria properties of RbCl + H 2 O and CsCl + H 2 O systems. The obtained models can reproduce and predict the thermodynamic properties and phase diagram of the two binary systems well for the temperature range from 200 K to 370 K. The present models have an advantage especially at subzero temperatures due to the utilization of low temperature solubility experimental data in parameterization.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2017
·
IF 2.323
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
Solubility isotherms of the ternary NaCl + RbCl + H2O system were elaborately determined at T = (273.15 and 298.15) K by an isothermal equilibrium method, and the results showed that there are only two solubility branches for the solid phase NaCl(cr) and RbCl(cr) at both temperatures. The liquid composition of invariant points at T = (263.15, 323.15, 338.15, and 348.15) K were also determined. The experimental data at T = 298.15 K were reproduced using a Pitzer–Simonson–Clegg activity model by adding a temperature independent ternary mixing parameter. Then, the solid–liquid equilibria in the ternary NaCl + RbCl + H2O system were predicted from the available binary parameters obtained in our previous study and the mixing parameter regressed at 298.15 K in this study. The model was further validated by comparing the predictions with the present data at other temperatures that were not used in parametrization. Finally, the phase diagram of the ternary NaCl + RbCl + H2O system in the temperature range from the lowest eutectic point to 373.15 K was constructed to lay the foundation for equilibria property predictions for more complex Rb-containing systems.
研究领域:
物理化学
·
热力学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) phase equilibrium of the ternary system (NaCl + RbCl + H 2 O) at T = (288.15, 298.15 and 308.15) K was studied by the method of isothermal solution saturation. Moreover, the density and refractive index of the solution was also determined. The solid phase was studied by the Schreinemaker’s wet residue method and verified by X-ray diffraction. The results show that each of the phase diagrams contains one invariant point, two univariant curves, and three crystallization regions. The crystallization region of NaCl increased obviously with the temperature increasing, while the crystallization regions of RbCl and the mixed crystallization region of (NaCl + RbCl) decreased a little. Furthermore, there are break points at the invariant points for density and refractive index curves.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2018
·Vol. 48
·期 3
·367-378
·
IF 1.401
Li Hongxia,Guo Lijiang,Li Jianqiang
The water activities of the MgCl 2 –RbCl–H 2 O ternary system and its sub-binary systems have been measured with the isopiestic method at 323.15 K. The measured water activities for the MgCl 2 –H 2 O and RbCl–H 2 O sub-binary systems agree well with the results reported in literature. The measured equal water activity lines of the MgCl 2 –RbCl–H 2 O ternary system are not straight lines, which means the mixing behavior of the solutions do not obey Zdanovskii’s rule. The solubility of the MgCl 2 –RbCl–H 2 O ternary system has been determined with the Flow-Cloud-Point method at 323.15 K, and the measured results are roughly consistent with values reported in the literature. The Pitzer model was selected to correlate the water activity and solubility data measured in this work. The predicted water activities and solubility isotherm for the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K, with binary solution parameters only, both deviated from the experiment values. The ternary solution Pitzer model parameters were obtained by fitting the measured water activities in the ternary system. The water activities and solubility isotherms of the MgCl 2 –RbCl–H 2 O ternary system at 323.15 K were calculated including both binary and ternary solution parameters. The calculated water activities are consistent with the experimental values. The calculated solubility isotherms are roughly consistent with experiment values, except they deviate somewhat in the RbCl crystallization region.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2019
·Vol. 11
·期 8
·1093-1103
·
IF 0
Wu Yujie,Zhang Yuting,Gong Yinyan,Niu Lengyuan,Li Can,Liu Xinjuan
Photocatalysis is a green and effective way to degrade antibiotic remnants, one of the main persistent and ecotoxic sources for aquatic environment pollution. Developing highly efficient photocatalysts is a key issue for large-scale application of this technique. In this work, we showed
that layered heterostructure photocatalyst composed of defective g-C3N4 by RbCl-assisted thermal polymerization of melamine (RbCN)/Bi2O2CO3 (BOC) appeared as a promising candidate for photocatalytic degradation of antibiotic pollutants.
The as-prepared RbCN/BOC heterostructure photocatalyst exhibited better photocatalytic activity than bare BOC, and can degrade 84% of tetracycline hydrochloride within 60 min under illumination. The observed improvement is ascribed to enhanced transfer and restrained recombination of free
electron–hole pairs generated under light irradiation as a result of staggered band alignment of RbCN/BOC, extended optical response region, large interface area and possibly more reactive sites associated with RbCl-assisted in-plane structural modification of g-C3N4.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
JOURNAL OF SOLUTION CHEMISTRY
·
2017
·Vol. 46
·期 9
·1767-1777
·
IF 1.342
Guo Lijiang,Wang Yaxiao,Tu Lanying,Li Jianqiang
Water activities for the MgCl 2 –RbCl–H 2 O ternary system and its sub-binary MgCl 2 –H 2 O and RbCl–H 2 O systems at 298.15 K have been measured using the isopiestic method. The measured results for the binary systems agree well with literature data. The measured equal water activity lines for the MgCl 2 –RbCl–H 2 O ternary system deviate from Zdanovskii’s rule. The solubilities for the MgCl 2 –RbCl–H 2 O ternary system also have been measured using a isothermal visual first/last crystal method, and the results are consistent with one reported set of solubility data. Pitzer’s model was selected to correlate the measured water activity and solubility data and the parameters reported in the literature are re-examined by comparing the model-calculated equal water activity lines and solubilities with experimental values measured in this work. New and reasonable parameters are obtained by fitting the water activity and solubility data measured in this work and those reported in the literature. The water activities and solubilities were simulated with the new parameters and the results show that the Pitzer model can successfully represent the thermodynamic properties and be used to calculate the solubility isotherms.
研究领域:
化学热力学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Dandan Gao,Dongdong Li,Bin Hu,Wu Li
A temperature-dependent thermodynamic model was developed for representing the solid–aqueous equilibria in the quaternary NaCl + KCl + RbCl + H2O system based on the previous ones for binary and ternary systems. The solid–liquid equilibria in the quaternary system were first predicted by the developed model and then verified by conducting the experiments at T = 298.15 K by an isothermal equilibrium method with equilibration times of 5 and 160 days, respectively. The predicted univariant curve saturated with NaCl(cr) and (K,Rb)Cl(ss) in the system is in good agreement with our experimental data. Moreover, to verify the reliability of the model for the prediction of solid solution composition that coexisted with NaCl(cr), the XRD quantitative analysis technique based on the inverse Vegard approach is used. The experimentally determined solid solution compositions well support the results predicted by the model, indicating that the model can simultaneously predict the compositions of aqueous solution and solid solution that coexisted with a pure salt, i.e., NaCl(cr), in a system under an equilibrium state. Finally, phase diagrams of the quaternary NaCl + KCl + RbCl + H2O system at a temperature range of 273.15–373.15 K were predicted. These diagrams are useful for the future industrial applications.
研究领域:
物理化学
·
热力学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 18
·6411
·
IF 3.748
Zhangyang Kang,Maogang He,Guangxuan Lu
In this study, the phase diagram of the NaCl+RbCl binary system was measured using differential scanning calorimetry, and the measured molar percentages of the binary mixture RbCl ranged from 12 to 97 mol%, updating and extending the experimental data for this binary system. The liquid phase of this system was thermodynamically modeled using a modified quasichemical model, and a computer optimization program for evaluation of the experimental data on phase equilibria and other thermodynamic data was developed based on this model. All thermodynamic models of the NaCl+RbCl binary system were constructed; calculations of the phase diagram, enthalpy of mixing, and activity coefficient of NaCl of the NaCl+RbCl binary system were completed using the obtained model parameters; and the calculated eutectic point positions werexRbCl= 0.567 and 550.2 °C. The calculated results were able to reproduce the various types of experimental data well, and the thermodynamic self-consistency between different types of experimental data was demonstrated.Keywords:differential scanning calorimetry;modified quasichemical model;phase diagram;thermodynamics;phase equilibria;activity coefficient
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Plants-Basel
·
2021
·Vol. 10
·期 4
·717
·
IF 3.935
Auni Aqilah Ahmad Tarmizi,Alina Wagiran,Faezah Mohd Salleh,Lee Suan Chua,Farah Izana Abdullah,Rosnani Hasham,Suraiya Binte Mostafiz
Labisia pumilais a precious herb in Southeast Asia that is traditionally used as a health supplement and has been extensively commercialized due to its claimed therapeutic properties in boosting a healthy female reproductive system. Indigenous people used these plants by boiling the leaves; however, in recent years it has been marketed as powdered or capsuled products. Accordingly, accuracy in determination of the authenticity of these modern herbal products has faced great challenges. Lack of authenticity is a public health risk because incorrectly used herbal species can cause adverse effects. Hence, any measures that may aid product authentication would be beneficial. Given the widespread use ofLabisiaherbal products, the current study focuses on authenticity testing via an integral approach of DNA barcoding and qualitative analysis using HPLC. This study successfully generated DNA reference barcodes (ITS2andrbcL) forL. pumilavar.alataandpumila. The DNA barcode that was generated was then used to identify species ofLabisia pumilain herbal medicinal products, while HPLC was utilized to determine their quality. The findings through the synergistic approach (DNA barcode and HPLC) implemented in this study indicate the importance of both methods in providing the strong evidence required for the identification of true species and to examine the authenticity of such herbal medicinal products.Keywords:Labisia pumila;DNA barcoding;ITS2;rbcL;herbal medicinal products (HMPs);HPLC;authentication
研究领域:
植物学
·
分子生物学
·
药学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2024
·
IF 2
Yueheng Wang,Ziyu Zhuang,Yanfei Fan,Dandan Gao,Dongdong Li
Ammonium ion is of the same charge as alkali ions and with similar ionic radius as potassium, rubidium, and cesium ions. Solid solutions are very common between ammonium and alkali salts, which is of great interest for understanding the geology, soil, and environment fate of these elements. In this study, the solid–aqueous equilibrium in the NH4Cl + RbCl + H2O and NH4Cl + CsCl + H2O systems was determined at 298.15 K. For each system, two incontinuous solid solutions, i.e. (NH4,Rb)Cl(α) and (Rb,NH4)Cl(β), or (Cs,NH4)Cl(α) and (NH4,Cs)Cl(β), presented, and their composition and structure were studied using Schreinemakers’ wet residues analysis, XRD, and Raman characterization. The equilibrium between these solid solutions and aqueous solutions were well modeled using an integrated solution equilibrium calculator program, in which a Pitzer-Simonson-Clegg model and a subregular model were implemented for describing the nonideality of aqueous phase and solid solution. According to the experimental and thermodynamic modeling results, NH4Cl can dissolve RbCl and CsCl in the solid state (NH4,Rb)Cl(α) or (NH4,Cs)Cl(β) with limited solid solubilities of 0.18 or 0.051 in mole fraction, respectively. RbCl or CsCl can also dissolve NH4Cl in the solid state (Rb,NH4)Cl(β) or (Cs,NH4)Cl(α) with limited solid solubilities of 0.37 and 0.095 in mole fraction, respectively.
研究领域:
化学
·
环境科学
·
地质学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2016
·
IF 2.196
Xiuhua Hao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) equilibrium (SLE) and (liquid + liquid) equilibrium (LLE) of RbCl/CsCl + ethylene carbonate (EC) + H 2 O ternary systems were carefully investigated at 298.15 K. The SLE and LLE data were correlated by the corresponding equations respectively. Furthermore, the thermodynamic properties of RbCl/CsCl in the EC–water systems were determined by potentiometric method at T = 298.15 K. The experiment data were correlated by the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The mean activity coefficients, osmotic coefficients and excess Gibbs free energies, standard Gibbs free energy of transfer and the standard solubility product of systems were calculated. The mean activity coefficient γ ± decreases with the increase of the molality of electrolyte at the fixed mass fraction of EC. But γ ± vary abnormally with the increase of the EC content. The result of Δ G t 0 reflects the spontaneously transfer of the electrolytes from water to the mixed solvents.
研究领域:
物理化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2020
·
IF 2.369
Lijiang Guo,Hongxia Li
The solubility of the RbCl–CsCl–H2O ternary system has been investigated at the temperature range from 298.15 to 348.15 K by two different methods, namely, the Flow-Cloud-Point (FCP) method and the Isothermal Dissolve Equilibrium (IDE) method. The measured solubility for this ternary system at 298.15 K by FCP method is consistent with the reported result in literature. The measured solubility results for this ternary system at 323.15 K by the FCP and IDE, two different methods that are consistent with each other, which indicated the results are more reliable. Meanwhile, the measured liquid–wet solid–solid lines proved that the equilibrium solid phases are two types of solid solutions (Rb,Cs)Cl(ss) and (Cs,Rb)Cl(ss) rather than pure salts (RbCl and CsCl) reported in literature. For the first time, the solubility of the RbCl–CsCl–H2O ternary system at 308.15 and 348.15 K has been measured by IDE method. The measured results shown that the equilibrated solid phases in this ternary system at 308.15 and 348.15 K are two types of solid solution (Rb,Cs)Cl(ss) and (Cs,Rb)Cl(ss), at RbCl rich side and CsCl rich side, respectively.
研究领域:
无机化学
·
溶液热力学
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）