A novel chitosan modified material, CTS-AM-AO-DA was synthesized through the crosslinking of chitosan with amidoxime group and (1-(dimethylamino)allyl) phosphonic acid (DMAAPA) as the uranium adsorbent from seawater. The chemical structures and appearance of the polymers were characterized by the FT-IR spectrum and the SEM. The adsorption kinetics in simulated seawater and the effects of solution pH, salinity, and competing ions on the adsorption properties of materials were studied by using adsorption experiments. The equilibrium adsorption capacity of CTS-AM-AO-DA is 223 mg/g and the adsorption dynamic data are applicable to the quasi-second-order model. Weak alkalinity (8.0), high salinity (0.5 mol/L) or the presence of competitive ions (Ca2+, Mg2+, V5+) can not affect the adsorption properties of this material (CTS-AM-AO-DA) that provides the potential applications in real seawater environment.
