Preparation, characterization and enhanced adsorption performance for Cr(VI) of mesoporous NiFe2O4 by twice pore-forming method

► The increase of BET area was realized by leaching of ZnO from mesoporous ZnO/NiFe2O4. ► TPF-NiFe2O4 demenstrates higher adsorption capacity for Cr(VI) in aqueous solution. ► TPF-NiFe2O4 with magnetic sensitivity is promosing for Cr(VI) removal. ► The used TPF-NiFe2O4 adsorbent can be recycled.