Composite SiO2-iron oxide materials for magnetically intensified adsorption

Composite SiO2-iron oxide materials were prepared by three experimental pro cedures. In the first case, the iron oxides were precipitated during a sol- gel process. In the second case, a SiO2 matrix was initially obtained, and the iron oxides were formed by thermal treatment after impregnation of a so luble Fe2+ salt in the previously processed matrix. In the third method, fe rrite powders, prepared by wet chemical method, were embedded into a SiO2 b ased sol-gel matrix. Materials with convenient porosity and nano-sized iron oxide content could be prepared using the mentioned methods. The prepared composite has been tested for arsenic(V) removal.