Fig. 1. (a) Effect of initial pH on biosorption of uranium by S. cerevisiae, (b) The relative species distribution of 100 mg·L^-1 U(Ⅵ) at different pH calculated by Visual MINTEQ 3.1 (c₀=100 mg·L^-1, T=25 ℃, M=5 g·L^-1, t=60 min)

Fig. 2. The changes of phosphorus content after biosorption under different pH

Fig. 3. (a) Effect of reaction time on biosorption of uranium by S. cerevisiae and the pseudo-second-order kinetic model, (b) Webber intraparticle diffusion model (c₀=100 mg·L^-1, pH=3.0, T=25 ℃, M=5 g·L^-1)

Fig. 4. Effect of temperature on the biosorption of U(Ⅵ) by S. cerevisiae

Fig. 5. (a) FTIR of S. cerevisiae before and after reaction with uranium, (b) FTIR-peak-differentiating analysis in 900~1 800 cm^-1 range

Fig. 6. SEM-EDS of S. cerevisiae before and after reaction with uranium
(a): Control; (b): After reaction

Fig. 7. X-ray photoelectron binding energy curves of S. cerevisiae before and after biosorption
(a): Full spectrum; (b): U(4f) spectra; (c): P(2p) spectra; (d): The ratio of Sp/Sc under different uranium adsorption capacity

Fig. 8. XRD patterns of S. cerevisiae before and after biosorption of uranium