天然和碳酸铵改性高岭石粘土吸附去除水中重金属的研究

IF 0.8 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY South African Journal of Chemistry-Suid-Afrikaanse Tydskrif Vir Chemie Pub Date : 2023-01-01 DOI:10.17159/0379-4350/2023/v77a09
J. Lawal, E. Odebunmi, F. A. Adekola
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引用次数: 0

摘要

采用碳酸铵处理尼日利亚Share天然高岭石,提高其吸附能力。将天然黏土(SK黏土)吸附金属离子的最佳操作条件应用于碳酸铵处理的黏土(SK- ac黏土)。采用吸附等温线和动力学模型对吸附数据进行了分析。统计p值小于0.05,表明模型项对金属离子的吸附是显著的。拟二级动力学模型最能描述金属离子的吸附机理。得到的活化能小于40 kJ mol-1,表明存在物理吸附。Langmuir吸附等温线模型拟合Fe2+、Zn2+和Cr6+离子的吸附数据,Freundlich模型拟合Pb2+离子的吸附数据。热力学参数分析表明,吸附是自发的吸热吸附。碳酸铵改性粘土的吸附量分别从10.74 ~ 13.60 mg g-1、16.48 ~ 17.38 mg g-1和11增加。Fe2+、Pb2+和Zn2+的吸收量为96 ~ 13.8 mg g-1, Cr6+的吸收量为8.75 ~ 7.25 mg g-1。结果表明,碳酸铵处理可增强含高岭土对Fe2+、Pb2+和Zn2+离子的吸附。
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Removal of heavy metals from aqueous solutions by adsorption using natural and ammonium carbonate modified kaolinite clays
Natural kaolinite obtained from Share, Nigeria was treated with ammonium carbonate to enhance the adsorption capacity. The optimum operating conditions for the adsorption of metal ions on the natural clay (SK clay) were employed on the ammonium carbonate-treated clay (SK-AC clay). The adsorption data were analysed using adsorption isotherm and kinetic models. The statistical p-values were less than 0.05, indicating that the model terms are significant for the adsorption of the metal ions. The pseudo-second-order kinetic model best describes the metal ions adsorption mechanism. The activation energy values less than 40 kJ mol-1 obtained indicated physisorption. Langmuir adsorption isotherm model fitted the adsorption data for Fe2+, Zn2+ and Cr6+ ions while the Freundlich model fitted Pb2+ ions adsorption. Analysis of thermodynamic parameters shows the adsorption is spontaneous and endothermic. The ammonium carbonate-modified clay exhibited an increase in adsorption capacity from 10.74 to 13.60 mg g-1, 16.48 to 17.38 mg g-1 and 11. 96 to 13.8 mg g-1 for Fe2+, Pb2+ and Zn2+ ions while uptake of Cr6+ decreased from 8.75 to 7.25 mg g-1. The results showed that the adsorption of Fe2+, Pb2+ and Zn2+ ions onto kaolin-containing cowlesite can be enhanced by treating it with ammonium carbonate.
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来源期刊
CiteScore
3.10
自引率
0.00%
发文量
6
审稿时长
>12 weeks
期刊介绍: Original work in all branches of chemistry is published in the South African Journal of Chemistry. Contributions in English may take the form of papers, short communications, or critical reviews.
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