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Bilayer-silane-coated Fe 3 O 4 nanoparticles with inner layer of tetraethoxy silane (TEOS) and outer layer of vinyltriethoxysilane (VTEO) were generated to enhance their acid resistance. These nanoparticles were copolymerized with vinylbenzyl chloride (VBC) using suspension polymerization, and then post-crosslinked. The resulting hypercrosslinked magnetic resin M150 presented specific bimodal property with large specific surface area of 1109 m 2 /g. It exhibited more excellent adsorption capacity of p -nitrophenol compared to another two magnetic adsorbents Q150 and MIEX ® . Moreover, the acid stable property of the magnetite in M150 extended its application at low pH value.

Magnetic powder resin Q150 with high specific surface area of 1074 m2/g was prepared by the membrane emulsification-suspension polymerization technique. Adsoption of tetracycline on the obtained sorbent Q150 was evaluted by using the granule resin (GR) XAD-4, the powder activated carbon (PAC) 1240AC and the granule activated carbon (GAC) HD4000 for comparison. It was found that Q150 had a larger adsorption capacity, faster kinetic and easier regeneration under alkaline condition. The results suggested that the powder resin (PR) Q150 would be a promising sorbent for removing antibiotics and even other organic micropollutants from the aquatic environment.

Membrane emulsification-suspension polymerization method was introduced to prepare the monodisperse hypercrosslinked adsorbents ZQ-1 and ZQ-2 which can be used in solid phase extraction (SPE). Compared with the commercially available adsorbent LichrolutEN, ZQ-1 exhibits obvious superiority for five conventional polar analytes owing to its large specific surface area, hydrophilic groups and small particle size.