Preparation of Magnetic Hyper-Cross-Linked Polymers for the Efficient Removal of Antibiotics from Water

A novel method for fabricating magnetic hyper-cross-linked polymers (MHCPs) with high Brunauer–Emmett–Teller (BET) specific surface area, large pore volume, and good magnetic properties was developed. The synthesis process of MHCPs included two steps: the preparation of HCPs by external cross-linker and the in situ oxidation of the iron source in the structure of HCPs. On the basis of the systematic investigation of the influences of oxidation time and amount of hydrogen peroxide added, a series of MHCPs with different specific surface area, pore volume, and magnetic responsiveness was controllably prepared with the highest BET specific surface area and maximum saturation magnetization of 729.93 m2/g and 12.4 emu/g, respectively. Furthermore, the adsorption performance of MHCPs with antibiotics was studied by using chloramphenicol (CAP) and tetracycline hydrochloride (TC) as model adsorbates. The kinetics isotherms of CAP and TC followed a pseudo-second-order model, and the adsorption isotherms of them we...