Controllable Synthesis of Polar Modified Hyper-Cross-Linked Resins and Their Adsorption of 2-Naphthol and 4-Hydroxybenzoic Acid from Aqueous Solution

We synthesized a series of polar hyper-cross-linked resins, and the porosity and polarity of these resins were effectively tuned by feeding different amounts of glycidyl methacrylate (GMA). As the feeding amount of GMA increased, the Brunauer Emmett Teller surface area, pore volume, micropore area, and micropore volume sharply decreased; the pore size distribution of the resins showed a large population of pores in the microporous region extending to a higher part of the mesoporous region, and the O content increased while the static contact angle lowered. The adsorption experiments indicated that these resins were efficient for adsorption of 2-naphthol and 4-hydroxybenzoic acid (4-HBA). The adsorption process was very fast, and the kinetic data for the adsorption of 2-naphthol could be well-fitted by a pseudo-second-order rate equation, while those for the adsorption of 4-HBA could be characterized by a pseudo-first-order rate equation.