Adsorpce toxických oxoaniontů Se na povrchově upravený kaolin
Klíčová slova:adsorpce, oxoanionty Se, povrchově upravený kaolin
Se is a trace element and an important micronutrient. At higher concentrations it may become a serious threat for the environment and human health. Se occurs in nature in organic or inorganic compounds (SeO32–, SeO42–). The toxic compounds can be removed from water by adsorption on aluminosilicates (kaolins, bentonites, zeolites). The aim of this work was the preparation of new low-cost sorbents based on kaolins and determination of their stability. The adsorbents were prepared by treatment of kaolin with Fe2+ or Al3+ solution yielding mesoporous amorphous FeIII or AlIII oxides/hydroxides. The obtained materials were selective adsorbents of SeIV in water. The batch sorption was performed with 10–1500 mg l–1 aqueous Se solutions and evaluated using a Langmuir model. The removal of Se using the Al-treated kaolin was more effective than its Fe analog.