Adsorption of Pb2 + and Cd2 + by Amphoteric Modified Bagasse Hemicellulose

In this study, the adsorption effect of Pb2+ and Cd2+ was investigated using amphoteric modified bagasse hemicellulose as adsorbent. The heavy metal ions adsorbed increased slowly after 30 min, and remained stable after 180 min. Application of level-2 dynamic model describing the amphoteric modified bagasse hemicelluloses gave the adsorption capacity of lead and cadmium were at 65.79 mg · g–1 and 36.23 mg · g–1, respectively. At the temperature of 293 K, the pseudo-second-order dynamics equations for the adsorption of Pb2+ and Cd2+ were as follows: dqt/dt = 0.0231(65.79–qt )2, dqt/dt = 0.0428(36.23–qt )2. Ion coexisting experiments showed that the affinity of Pb2+ was much higher than that of Cd2+.