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标题：Adsorption of Copper Ions in Aqueous Solution by Montmorillonite-Biochar Composite
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作者：Yuanyuan Cai ; Yaowei Du ; Yue Wang 等
期刊名称：Nature, Environment and Pollution Technology
印刷版ISSN：0972-6268
出版年度：2019
卷号：18
期号：4
页码：1201-1209
语种：English
出版社：Technoscience Publications
摘要：A composite adsorbent was prepared by montmorillonite and biochar from peanut shell. The adsorption experiment of the Cu 2+ ions from aqueous solution by the montmorillonite-biochar composite was carried out in detail. The effects of initial concentration of Cu 2+ ions in aqueous solution and contact time on adsorption efficiency were studied. FTIR spectroscopy, SEM and TEM analyses, standard N 2 adsorption-desorption techniques, EDS and XPS were used to evaluate the physico-chemical, textural and crystalline properties of the montmorillonite-biochar composite. Results showed that the montmorillonite-biochar composite was mesoporous material. The surface of montmorillonite-biochar composite was rough with irregular layer structure. According to the experimental data, pseudo first order kinetics model and pseudo second order kinetics model were applied. The adsorption process fits well with the pseudo second order kinetics model. The predominant process is chemisorption, which involves a sharing of electrons between the adsorbate and the surface of the adsorbent. Adsorption data were correlated well by Freundlich isotherm models and adsorption process was chemical. It is concluded that the montmorillonite-biochar composite can be used as an effective adsorbent for the removal of Cu 2+ ions from aqueous solutions.
关键词：Adsorption;Copper ions;Montmorillonite-biochar;composite;Peanut shell