Abstract: A series of acrylic ester resins with different pore structures was synthesized by varying the type and the amount of monomers, crosslinkers and poreforming agents. Among of them, resin 1# polymerized by trimethylolpropanetrimethacrylate(TRIM) with suitable pore distribution structure, resin 5# by TRIM and triallylisocyanurate(TAIC) with amide groups, and the commercial macroporous acrylic resin XAD-7 were used to study the adsorption behavior of tylosin and the mechanism on acrylic ester resins. The 1# resin exhibited a better adsorption property toward adsorbate. Similar patterns of pH-dependent adsorption showed that the adsorption amounts of tylosin increased with the increase pH values. The amounts of tylosin adsorbed increased in the presence of NaCl while decreased with CuCl2 because of the dominant contribution of hydrophobic effect and size-exclusion effect. The adsorption kinetics of the three adsorbents followed the pseudo-second order model, while the adsorption isotherm data fit well to the Langmuir models, indicating the coverage of the surface by a mono-molecular layer. The apparent temperature influence on the adsorption process demonstrated that the “solvent replacement” was the dominant mechanism.

Key words: acrylic ester resins, synthesis, adsorption, tylosin, mechanism