摘要:
By the technology of inverse suspension polymerization,theophylline template phenolic resin sorbent (TTPS) and nontemplate 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 Kd1=0129 mmol/L and Qmax1=138 mol/g for high affinity binding sites and Kd2=0433 mmol/L and Qmax2=184 mol/g for lower affinity binding sites,respectively.Moreover,it was found that the sorption rate data of theophylline adequately fitted a semiempirical rate equationn in initial period.It confirmed the particlediffusion control mechanism of the sorption process.When 200 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 15 BV/h the removing of 972% of all the theophylline adsorbed on TTPS was observed at 4 bed volumes.The result showed that TTPS possessed excellent desorption performance.