Abstract
An adsorbent for fluoride removal from drinking water was prepared by coating Fe–Ti bimetallic oxide on magnetic Fe3O4 particles by co-precipitation. The adsorbent was a nanosized composite with a core–shell structure comprising a magnetic Fe3O4 core of 10–20nm in diameter and an amorphous adsorbent shell of several nanometer thickness. The synthesis parameters were optimized to give high adsorption capacity and high magnetization. The optimized mass ratio of the Fe–Ti bimetallic oxide shell to Fe3O4 core was 2.72. The adsorption isotherm was well fitted with the Langmuir isotherm and the saturation adsorption capacity 57.22mg/g adsorbent. Adsorption was fast and reached equilibrium within 2min. The nano-adsorbent was superparamagnetic with a saturation magnetization of 18.4emu/g, which allowed rapid separation of the adsorbent from the water solution by an external magnet.
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