Adsorption Kinetics of Key Nuclides From Nuclear Power Plant on Marine Sediments

In order to study the adsorption kinetics of key nuclides from nuclear power plants on marine sediments, the adsorption kinetics curves of ⁹⁰Sr, ¹³⁷Cs, ⁵⁴Mn and ⁶⁰Co on three kinds of sediments were obtained by static batch experiments. The experimental data were fitted by multi-stage adsorption kinetics model. The  distribution coefficients(Kd) of ⁹⁰Sr, ¹³⁷Cs, 54Mn and ⁶⁰Co on the three sediments are 1.8-3.0, 71.5-128.0, 23.1-167.0, 160.0-188.0 mL/g, respectively. The Kd is good agreement with the experimental data, indicating that the adsorption behavior of three sediments can be characterized by the first-order adsorption sites. The key parameters of adsorption kinetics were obtained, including adsorption rate constant, desorption rate constant and maximum adsorption capacity per unit.