Fig. 1.

Characterization of MnO₂-BSA NPs. (a) TEM images of MnO₂-BSA. (b) Size distribution of MnO₂-BSA determined by DLS in PBS. (c) UV–vis absorbance spectra of MnO₂-BSA with different concentrations in PBS. (d) UV-Vis absorption spectra of MB after degradation by the MnO₂-BSA -mediated Fenton-like reaction in different solutions. (e) The degradation process of MB at different time points. (f) The degradation process of MB under different concentration of H₂O₂. (g) The degradation process of MB under different PH. (h) EPR spectra of different groups, where the 5,5-dimethyl-1-pyrroline N-oxide (DMPO) served as the spin trapping agents to detect the •OH generation during the reaction. (i) Radiolabeling stability of ²¹¹At-ATE-MnO₂-BSA in PBS and 10% FBS