STUDIES OF THEOPHYLLINE IMPRINTED PHENOLIC RESIN SORBENT

By the technology of inverse suspension polymerization, theophylline template phenolic resin sorbent (TTPS) and non-template phenolic resin sorbent (NTPS) have been synthesized. Comparison of theophylline adsorption on TTPS and NTPS was made. The experimental results showed that the adsorption data fitted the Langmuir model, which implied the monomolecular layer sorption in these systems. Theophylline adsorption data matched Freundilich equation within the low concentration range, which meant the adsorption was preferential. By Scatchard analysis, it was found that TTPS showed specific binding sites. The dissociation constants and the maximum binding capacity were calculated to be K-d1 = 0.129 mmol/L and Q(max1) = 138 mu mol/g for high affinity binding sites and K-d2 = 0. 433 mmol/L and Q(max2) = 184 mu mol/g for lower affinity binding sites, respectively. Moreover, it was found that the sorption rate data of theophylline adequately fitted a semi-empirical rate equationn in initial period. It confirmed the particle-diffusion control mechanism of the sorption process. When 2. 00 mmol/L solution of theophylline at the rate of 3 BV/h flowed through TTPS columns, breakthrough point was 24th bed volume under dynamic condition. It was clear that with 1 mol/L hydrochloric acid at the rate of desorption 1.5 BV/h the removing of 97. 2% of all the theophylline adsorbed on TTPS was observed at 4 bed volumes. The result showed that TTPS possessed excellent desorption performance.