Abstract: Polyacrylonitrile-potassium cobalt/titanium hexacyanoferrate(Ⅱ) spherical composite adsorbents （PAN-KCoCF and PAN-KTiCF） were prepared to remove cesium ions from aqueous solution. The effects of contact time, pH, competition ions and initial cesium concentration on cesium sorption were investigated via batch experiments. The adsorptive kinetics and isotherms were analyzed. The characterization of PAN-KCoCF and PAN-KTiCF were performed by SEM, FT-IR, XRD, etc. The results show that the cesium sorption of PAN-KCoCF and PAN-KTiCF can reach equilibrium after about 16 h. With the increase of pH, the cesium sorption of PAN-KTiCF increases fast at first and maintains at an almost constant value, while the cesium sorption of PAN-KCoCF isn’t almost affected. Compared with PAN-KTiCF, the cesium sorption of PAN-KCoCF is more selective when K⁺, Na⁺, NH⁺₄, Ca²⁺ or Mg²⁺ is added to solution. The sorption kinetics of two adsorbents for Cs⁺ can be described by pseudo-second-order equation, and the sorption rate is mainly controlled by surface adsorption. The sorption of two adsorbents for cesium is monolayer adsorption, and the sorption data can be interpreted in terms of Langmuir isotherm. The saturated adsorption capacities of PAN-KCoCF and PAN-KTiCF are 128.370 mg/g and 278.552 mg/g, respectively.