In this study,the passion peel insoluble dietary fiber(PIDF) was prepared from passion peels, and its adsorption characteristics for Cu2+, Pb2+ and Cd2+were studiedin the simulated intestines and stomach. The effects of the PIDF content and reaction time, and metal ion concentrationwere studied through adsorptionexperiments. Meanwhile,the adsorption isotherms and kinetics characteristicswere analyzed. The results showed that the adsorption of Cu2+, Pb2+ and Cd2+ by the PIDF reached equilibrium after 30 min in the simulated intestines and stomach.The equilibrium adsorption capacity of Cu2+, Pb2+ and Cd2+ by the PIDF in the simulated intestines were 8.751, 9.106 and 10.778 mg/g, and the absorption rate were 40.822%, 44.845% and 55.814%, respectively.Moreover, the equilibrium adsorption capacity of Cu2+, Pb2+ and Cd2+ by the PIDF in the simulated stomach were 4.852, 5.014 and 1.846 mg/g and the adsorption rate were 1.846 mg/g, and 24.201%, 24.807% and 9.273%, respectively. With the increase of metal ions concentration, the adsorption capacity of the PIDF to the metal ions increased, andthe adsorption rate decreased. The adsorption capacity of the PIDF to the metal ionsdecreased with the increase of PIDF content, and the adsorption rate increased.The adsorption isotherms and kinetics indicated that the adsorption of metal ions bythe PIDF was the multi-molecular layer adsorption. The adsorptionbehavior conformed to the pseudo-second-order kinetic model (R2>0.99).The adsorption rate was controlled by liquid film diffusion and intraparticle diffusion,and the intraparticle diffusion was rate-controlling step.
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