Adsorption characteristics and mechanism of hydroxyethyl cellulose/sodium alginate blend films for uranium(Ⅵ)

Hydroxyethyl cellulose/sodium alginate (HEC/SA) polymer composite porous films were made by blending HEC and SA together and crosslinked by glutaraldehyde, and its adsorption properties for uranium(Ⅵ) (U(Ⅵ)) in simulated wastewater containing uranium were studied. The effects of initial pH value, initial U(Ⅵ) ions concentration, temperature and adsorption time et al on the adsorption of HEC/SA blend films for U(Ⅵ) were investigated by static experiment. The process of adsorption was investigated by thermodynamic and kinetic analysis. The adsorption mechanism was investigated by FTIR, SEM, energy dispersive X-ray spectrum and so on. The experimental results show that there is a positive correlation between temperature and the U(Ⅵ) adsorption quantity, adsorption equilibrium time is about 90 min, and the optimal initial pH value is 5.0. The adsorption process conforms to the pseudo-second-order kinetics model, and mainly preforms particle internal diffusion. The isothermal adsorption process conforms to the Langmuir isothermal adsorption model, when the temperature is 45 ℃, the maximum adsorption capacity of HEC/SA blend films for U(Ⅵ) ions reaches 357.1 mg·g^-1. The adsorption of HEC/SA blend films for U(Ⅵ) presents ion-exchange process, and the interaction groups with U(Ⅵ) is carboxyl.