Fig. 2
Preparation and characterization of ZIF-8, As@ZIF-8 and As@ZIF-8/PEG. A Schematic diagram of As@ZIF-8/PEG preparation. B, C TEM images of ZIF-8 (B) and As@ZIF-8/PEG (C). D, E TEM-EDS characterization of ZIF-8 (D) and As@ZIF-8/PEG (E). F Zeta potential of ZIF-8, As@ZIF-8, and As@ZIF-8/PEG (n = 3). G FTIR spectra of blank ZIF-8 (pink), As@ZIF-8 (blue), and As@ZIF-8/PEG (green). H PXRD spectra of simulated ZIF-8 (blank), ZIF-8 (pink), As@ZIF-8 (blue), and As@ZIF-8/PEG (green). I–L XPS of the as-prepared samples: XPS survey spectra of ZIF-8 (pink), As@ZIF-8 (blue) and NaAsO2 (green) (I); N (J), C (K) and Zn (L) XPS spectra of ZIF-8 and As@ZIF-8. M Cumulative release of As from As@ZIF-8/PEG at pH 5.5 and 7.4 (n = 2)