Fig. 3

A Drug loading and its efficiency. B Thermogravimetric analysis of FMHN and FMDHN, and their weight loss between 70 and 450 °C heating. C Magnetization curves at room temperature for Fe3O4 nanozymes, FMHN and FMDHN. D Quantitative analyses of DOX release at 37 °C at different pH with and without PTT. E O2 generation in H2O2 solution with Fe3O4 nanozymes, FMHN and FMDHN with and without PTT. F Fluorescence spectra of terephthalic acid incubated with Fe3O4 nanozymes, FMHN, FMDHN with and without PTT in the hypoxic condition to show the presence of ·OH