In this study, sewage sludge-derived biochars (SSBs) were prepared at two pyrolysis temperatures of 450°C (SSB450) and 600°C (SSB600) for U(VI) removal. The maximum adsorption capacity of SSB450 and SSB600 was 43.13 and 47.47mgg-1, respectively, at initialpH of 3. While the adsorption process of U(VI) onto the SSBs were accurately described by the pseudo-second-order model and Langmuir isotherm model. Ion exchange and complexation were assumed as the adsorption mechanism. The adsorption–desorption experiment showed that both the U(VI) remova...