Thermodynamic properties and thermodynamic modelling for aqueous mixed system containing sodium tetraborate and sodium pentaborate

IF 2.2 3区工程技术 Q3 CHEMISTRY, PHYSICAL Journal of Chemical Thermodynamics Pub Date : 2025-02-20 DOI:10.1016/j.jct.2025.107471

Ruyi Lin , Shuaiqi Sun , Qingfen Meng , Dan Li , Yong Ma , Lingzong Meng , Yafei Guo , Tianlong Deng

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Abstract

The solubilities and physicochemical properties in the system Na₂B₄O₅(OH)₄–NaB₅O₆(OH)₄–H₂O at 323.15 K were studied with the isothermal dissolution method. The phase diagram in the system is composed of one co-saturation point, two solubility curves and two single-salt crystallization regions for Na₂B₄O₅(OH)₄·8H₂O and NaB₅O₆(OH)₄·3H₂O. The water activities and osmotic coefficients were determined based on the sodium chloride standard reference solution with the isopiestic method. With the assumption of only two boron species B₄O₅(OH)₄²⁻ and B₅O₆(OH)₄⁻ in the solution, the single salt parameters of NaB₅O₆(OH)₄ and mixing ion interaction parameters in the system were fitted with the solubilities and water activities based on Pitzer model. The dissolution equilibrium constants of NaB₅O₆(OH)₄·3H₂O were obtained with the activity product constant method. The agreement for the calculated solubilities and water activities with the experimental results in the system shows that the Pitzer model with the above assumption can be used to describe the experimental values.

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来源期刊

Journal of Chemical Thermodynamics 工程技术-热力学

CiteScore

5.60

自引率

15.40%

发文量

199

审稿时长

79 days

期刊介绍： The Journal of Chemical Thermodynamics exists primarily for dissemination of significant new knowledge in experimental equilibrium thermodynamics and transport properties of chemical systems. The defining attributes of The Journal are the quality and relevance of the papers published. The Journal publishes work relating to gases, liquids, solids, polymers, mixtures, solutions and interfaces. Studies on systems with variability, such as biological or bio-based materials, gas hydrates, among others, will also be considered provided these are well characterized and reproducible where possible. Experimental methods should be described in sufficient detail to allow critical assessment of the accuracy claimed. Authors are encouraged to provide physical or chemical interpretations of the results. Articles can contain modelling sections providing representations of data or molecular insights into the properties or transformations studied. Theoretical papers on chemical thermodynamics using molecular theory or modelling are also considered. The Journal welcomes review articles in the field of chemical thermodynamics but prospective authors should first consult one of the Editors concerning the suitability of the proposed review. Contributions of a routine nature or reporting on uncharacterised materials are not accepted.