Abstract:

Seven types of macroporous resin were selected to compare their performances in adsorbing and desorbing bamboo flavonoids. AB-8 macroporous resin showed high selectivity and good desorption property. Static sorption experiments were carried out to study the adsorption equilibrium and kinetics of bamboo flavonoids on AB-8 macroporous resin at different temperatures. The results indicated that Freundlich equation was  the best for the description of the adsorption equilibrium of bamboo flavonoids on AB-8 resin，the negative value of ΔG and the positive value of ?S showed that the adsorption was a spontaneous process of increased entropy，and the increase of temperature would benefit the adsorption process. The adsorption heat ?H was 13.45 kJ/mol within the range of hydrogen bond energy；and the FT-IR spectra of AB-8 resins before and after bamboo flavonoids adsorption further suggested that the adsorption of bamboo flavonoids on AB-8 resin was a type of physical adsorption with hydrogen bond. The kinetics results revealed the adsorption followed a pseudo-second-order reaction，and the adsorption rate was mainly decided by the film diffusion.