层状双氢氧化物吸收铜的平衡、动力学和热力学研究

IF 0.8 4区工程技术 Q4 ENGINEERING, CHEMICAL

Hemijska Industrija Pub Date : 2017-11-12 DOI:10.2298/HEMIND150608005N

Ayawei Nimibofa, E. A. Tobin, S. David, W. Donbebe, Dikio Ezekiel Dixon

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引用次数: 4

摘要

本研究探讨了Mg/Al层状双氢氧化物（LDH）在合成和表征后对水溶液中Cu2+的吸附能力。采用间歇吸附工艺实验研究了浓度、温度和吸附时间等操作参数对Cu2+吸附的影响。研究发现，层状双氢氧化物（LDH）可以作为吸附剂去除低浓度金属盐水溶液中的铜离子。活化能、等温吸附热、熵和焓的平均值分别为1.447、12.9、0.0137和–4.8390 kJ/mol。这表明金属离子在吸附剂上的吸附遵循物理吸附机制。动力学结果符合拟二阶模型（R2=0.9959）和二阶动力学模型（R2=0.09952），吸附剂的吸附特性符合Langmuir和Freundlich吸附等温线模型。

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Equilibrium, kinetic and thermodynamic studies of the uptake of copper by layered double hydroxide

This study explored the adsorption capacity of Mg/Al layered double hydroxide (LDH) for the removal of Cu 2+ from aqueous solutions after synthesis and characterization. The effect of various operational parameters such as concentration, temperature and sorption time on the adsorption of Cu 2+ was investigated using batch adsorption process experiments. It was found that layered double hydroxide (LDH) can be used as adsorbent for the removal of copper ions in aqueous solution containing low concentration of the metal salt. The average values of activation energy, isosteric heat of adsorption, entropy and enthalpy were 1.447, 12.9, 0.0137 and –4.8390 kJ/mol, respectively. This shows that the adsorption of the metal ion on the adsorbent follows a physical adsorption mechanism. The kinetic results conform to pseudo-second order model ( R 2 = 0.9959) and second order kinetic model ( R 2 = 0.9952) while the adsorption characteristics of the adsorbent followed both Langmuir and Freundlich adsorption isotherm models.

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来源期刊

Hemijska Industrija 工程技术-工程：化工

CiteScore

1.60

自引率

11.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Journal Hemijska industrija (abbreviation Hem. Ind.) is publishing papers in the field of Chemical Engineering (Transport phenomena; Process Modeling, Simulation and Optimization; Thermodynamics; Separation Processes; Reactor Engineering; Electrochemical Engineering; Petrochemical Engineering), Biochemical Engineering (Bioreactors; Protein Engineering; Kinetics of Bioprocesses), Engineering of Materials (Polymers; Metal materials; Non-metal materials; Biomaterials), Environmental Engineeringand Applied Chemistry. The journal is published bimonthly by the Association of Chemical Engineers of Serbia (a member of EFCE - European Federation of Chemical Engineering). In addition to professional articles of importance to industry, scientific research papers are published, not only from our country but from all over the world. It also contains topics such as business news, science and technology news, information on new apparatus and equipment, and articles on environmental protection.