Effective removal of bisphenols from aqueous solution with magnetic hierarchical rattle-like Co/Ni-based LDH

A novel unique adsorbent (Fe 3 O 4 @Co/Ni-LDH) has been successfully synthesized and applied for removal of bisphenols (BPs) from aqueous solution. The prepared adsorbent was characterized to appear in a hierarchical rattle-like structure, and possesses high specific surface area, abundant pore system, and magnetic properties. Adsorption kinetics fitted well with the pseudo-second-order model. Adsorption isotherms abide by the Langmuir model, and the maximum adsorption capacity for bisphenol A (BPA), F (BPF), AF (BPAF) and S (BPS) on Fe 3 O 4 @Co/Ni-LDH at pH of 7.0 were 238.96, 177.09, 320.56 and 345.84 mg/g, respectively. Moreover, it was found that the high pH and NaCl concentration were not conducive to the removal of BPs. The humic acid and real waters had no significant effects on the removal of BPs on Fe 3 O 4 @Co/Ni-LDH. Furthermore, the FT-IR spectra indicated that the removal of four BPs were primarily Hydrogen bond interaction between BPs and Fe 3 O 4 @Co/Ni-LDH. The Fe 3 O 4 @Co/Ni-LDH was regenerated effectively by methanol and can be repeatedly used. This novel Fe 3 O 4 @Co/Ni-LDH can be applied as a promising adsorbent for removal of BPs from aqueous matrices.