Investigation of the adsorption properties of U(VI) by sulfonic acid-functionalized carbon materials

In this study, sulfonic acid-functionalized carbon materials (CS-SO3H) was carbonized and functionalized by polyphosphazene (PZS). The morphology and structure were characterized by FTIR, XPS and SEM. The influences of pH, contact time, initial concentration and temperature of CS-SO3H for uranyl ions were investigated. Results indicated that the adsorption equilibrium time was about 20 min. The adsorption process was more consistent with the Langmuir isotherm and the pseudo-second-order model. In addition, the maximum adsorption capacity of CS-SO3H was about 341.98 mg/g. Moreover, the thermodynamic parameters of Delta G, Delta H and Delta S show that the uranium adsorption process was spontaneous and endothermic.

Automated summary

The carbonization and functionalization of CS-SO3H by PZS showed good adsorption performance for uranyl ions, with results indicating that the adsorption process followed the Langmuir isotherm and pseudo-second-order model. The maximum adsorption capacity was approximately 341.98 mg/g, and the thermodynamic parameters demonstrated that the adsorption of uranium was spontaneous and endothermic.