Research on Adsorption Property of Cs⁺ on PAN-NaTS Spherical Composite Adsorbent

The effects of contact time, pH, co-existing ions and initial Cs⁺ concentration on the adsorption property of Cs⁺ on polyacrylonitrile-sodium titanosilicate (PAN-NaTS) were studied by static experiments. The adsorption process was analyzed by thermodynamics, adsorption mechanism and kinetics, and the PAN-NaTS was characterized and analyzed by SEM, FT-IR and XRD. The results show that the adsorption process of Cs⁺ on PAN-NaTS reaches equilibrium after about 20 h, the optimized pH value of solution is in the range of 3.90-10.87, and the existence of K⁺, Na⁺, NH⁺₄, Ca²⁺ or Mg²⁺ has inhibiting effects on the adsorption. The adsorption process of PAN-NaTS mainly fits the pseudo-first-order equation. In addition, intraparticle diffusion and film diffusion control the rate of adsorption simultaneously, and the intraparticle diffusion is the main rate-controlling step. The adsorption of Cs⁺ on PAN-NaTS follows Langmuir model and is monolayer adsorption. The saturated adsorption capacity of Cs⁺ on PAN-NaTS is up to 219-298 mg/g.