Magnetic sepiolite composite (MSEP) was prepared in air.
The average pore diameter of MSEP was 8.6703 nm.
The isoelectric point of MSEP was obtained at pH 7.7.
The value of saturation magnetization of MSEP was 31.82 emu/g.
The maximum adsorption capacity for atrazine was 15.9 渭g/(m2 adsorbent).