Adsorption Behavior of the Multi-amino-modified Bagasse for Pb( Ⅱ ),Zn( Ⅱ),Cd( Ⅱ ) and Cu( Ⅱ ) in Aqueous Solution
Sugarcane bagasse was modified by multi-amino group to prepare for metal adsorbent The adsorp tion of Pb2+, Zn2+ , Cd2+ and Cu2+ from aqueous single metal solutions by the modification was studied. Within the test range, the results showed that, Pb2+ , Zn2+ , Cd2+ and Cu2+ were quickly adsorbed by the modification, the adsorption equilibration time of Pb2+ is 12h, and that of Zn2+ , Cd2+ and Cu2+ is 20h. respectively. The best adsorption pH is in the range of 4-5 for Pb2+ , about 6. 2 for Zn"' , and about 5 for Cd2+ and Cu2+ . The maximal adsorptive capacity of Pb2+ , Zn2+ , Cd2+ and Cu2+ is 34. 96mg/g,2. 24mg/g, 10. 40mg/g,2. 60mg/g, respectively. Langmuir and Freundlich equations can be used to fit the adsorption isotherm of Pb2+ , Zn2+ , Cd2+ and Cu2+.