Synthesis And Adsorption Performances Of Polar Hypercrosslinked Resin

Hypercrosslinked adsorbent is a kind of adsorptional polymer. Comparing with traditional adsorbents, it has high specific surface area, suitable pore and surface structure, well swellablity and easy regeneration. Currently, the most researched is synthesis of postcrosslinked polystyrene resin. However, it has many disadvantages. On the one hand, the resin skeleton structure of it is single, on the other hand, it needs higher cost. So in this paper, taking economy and convenience into account, melamine and trimesic acid or other aromatic acids were used as reactive monomers to prepare non-styrenic hypercrosslinked resin through polycondensation. And the adsorption properties of hypercrosslinked resin were studied.1.Using different concentration and ratio of melamine and trimesic as reactive monomers, a series of hypercrosslinked resin were synthesized by polycondensation. The result showed the BET surface areas of them were from 195.6 m2/g to 598.3 m2/g, and pore size of resins were distributed in macroporous, mesoporous, microporous. The determination of TG, bulk denstiy and solubility showed that this kind of resin is an excellent adsorbent of good performance and structure.2.Adsorption properties for phenol, puerarin and gallic acid of resin were studied. And the BET surface of resin was 598.3m2/g. The result showed that the adsorption capacity has reached 64.03 mg/g, 130.1 mg/g and 56.59 mg/g, and regeneration is good. Thermodynamic parameters showed that the main adsorption driving force is hydrogen bond beteween N, O in adsorbent and adsorbate, and the process is physical adsorption.3. Adsorption resins were prepared with different aromatic di-acid and melamine, and the number of carboxyl and amino groups are equal. The effect of different aromatic di-acid monomer on surface area and pore structure was studied. Three resins were obtained by the reaction of phthalic, isophthalic, terephthalic and melamine. BET surface area of the three resins were 615.9 m2/g, 515.5 m2/g and 399.1 m2/g. The adsorption capacity of phenol were 60.03 mg/g, 54.44 mg/g and 46.59mg/g, and the adsorption capacity of unit specific surface area for phenol were 97.47 mg/m2、105.6 mg/m2 and 137.4 mg/m2. It showed that the adsorption capacity was influenced by both specific surface area and functional groups.