Preparation of Amino-modified Chitosan Adsorbent and Its Adsorption Properties for Uranium
Chitosan microspheres(HTCC)were prepared by hydrothermal method,and Amino-modified chitosan adsorbent(AHTCC)was prepared by epoxidization and amination method to adsorb low concentration uranium in wastewater.The structure,composition and thermal stability of AHTCC were characterized by infrared spectrometer,elemental analyzer and thermogravimetric analyzer,and the adsorption and desorption properties of AHTCC for uranium were investigated.The results show that AHTCC has a good adsorption effect on uranium in solution at pH=5～8.Under the condition of equilibrium mass concentration of uranium adsorption of 120 mg/L,the adsorption capacity reaches the 151.6 mg/g.Its adsorption rate is faster in the initial 60 min and reaches equilibrium at 180 min.Using 80 g/L Na2CO3+20 g/L NaHCO3 as the desorption agent,the desorption rate of uranium is 97.5％.For real uranium containing wastewater with high concentration of impurities,the removal rate of uranium can reach 95.6％after single adsorption by AHTCC.
万方数据
维普
