Dowex G-26(H) 树脂去除水溶液中铁(III)离子的动力学和热力学

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING Russian Metallurgy (Metally) Pub Date : 2024-03-20 DOI:10.1134/S0036029523110071
A. A. Geidarov, N. I. Abbasova, Z. A. Dzhabbarova, A. A. Ibragimova, G. I. Alyshanly
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引用次数: 0

摘要

研究了强酸性 Dowex G-26(H)阳离子交换树脂对铁(III)吸附的影响因素。这些因素包括吸附剂剂量、溶液 pH 值、接触时间、溶液中铁(III)的初始浓度和温度。根据实验结果构建了 Langmuir 和 Freundlich 吸附等温线。这两个等温线都很好地描述了 Dowex G-26(H)吸附剂对铁(III)的吸附,其决定系数(R2)都很高(接近统一值)。在不同温度(T = 293-313 K)下,计算得出的吸附容量为 166.6 至 196.1 mg g-1。该过程的动力学和热力学参数(ΔH°、ΔS°、ΔG°)已经确定。计算得出的正标准熵(ΔS°)和焓(ΔH°)变化表明,Fe(III) 离子在树脂上的吸附是内热和自发的。
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Kinetics and Thermodynamics of Iron(III) Ion Removal from Aqueous Solutions by Dowex G-26(H) Resin

The factors affecting iron(III) adsorption by strongly acidic Dowex G-26(H) cation-exchange resin are studied. These factors include the adsorbent dose, pH of the solution, contact time, initial Fe(III) concentration in the solution, and temperature. Langmuir and Freundlich adsorption isotherms are constructed from the experimental results. Both isotherms quite satisfactorily describe Fe(III) adsorption by the Dowex G-26(H) adsorbent, which is indicated by high (close to unity) coefficients of determination (R2). The calculated capacity of the adsorbent ranges from 166.6 to 196.1 mg g–1 at different temperatures (T = 293–313 K). The kinetic and thermodynamic parameters of the process (ΔH°, ΔS°, ΔG°) have been determined. The positive calculated standard entropy (ΔS°) and enthalpy (ΔH°) changes suggest that the adsorption of Fe(III) ions on the resin is endothermic and spontaneous.

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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
期刊介绍: Russian Metallurgy (Metally)  publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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