RSC Advances, 2016, vol 6, 53, pp. 47530-47535
A novel type of porous magnetic microsphere (Fe3O4@HCP) was firstly synthesized just via one-step Friedel–Crafts alkylation promoted by FeCl3. This universal and facile method to fabricate porous magnetic microspheres possesses distinct advantages such as cheap reactants, mild reaction conditions, a short reaction time and a simple post-treatment process. The core–shell spheres with a well-defined and uniform morphology possess a high Brunauer–Emmett–Teller specific surface area (770 m2 g−1). Besides, the magnetization saturation value reaches up to 18 A m2 kg−1 which is high enough to separate Fe3O4@HCP from aqueous solution. Fe3O4@HCP possesses fast adsorption kinetics and an excellent adsorption capacity for organic dyes: methyl orange (211 mg g−1) and fuchsin basic (231 mg g−1). The adsorption-saturated Fe3O4@HCP composites can be easily collected by an external magnetic field and reused at least 3 times after simple Soxhlet extraction and drying.