Enhancement of the bentonite sorption properties
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- 作者：Annamá ; ria Mockovč ; iaková ; Zuzana Orolí ; nová ; Jiř ; í ; Š ; kvarla
- 关键词：Montmorillonite ; Magnetic composite ; Structural ; Surface and pore properties ; Sorption ; Low concentration
- 刊名：Journal of Hazardous Materials
- 出版年：2010
- 出版时间：15 August 2010
- 年：2010
- 卷：180
- 期：1-3
- 页码：274-281
- 全文大小：389 K
文摘
The almost monomineral fraction of bentonite rock–montmorillonite was modified by magnetic particles to enhance its sorption properties. The method of clay modification consists in the precipitation of magnetic nanoparticles, often used in preparing of ferrofluids, on the surface of clay. The influence of the synthesis temperature (20 and 85 °C) and the weight ratio of bentonite/iron oxides (1:1 and 5:1) on the composite materials properties were investigated. The obtained materials were characterized by the X-ray diffraction method and Mössbauer spectroscopy. Changes in the surface and pore properties of the magnetic composites were studied by the low nitrogen adsorption method and the electrokinetic measurements. The natural bentonite and magnetic composites were used in sorption experiments. The sorption of toxic metals (zinc, cadmium and nickel) from the model solutions was well described by the linearized Langmuir and Freundlich sorption model. The results show that the magnetic bentonite is better sorbent than the unmodified bentonite if the initial concentration of studied metals is very low.