fig18

Figure 18. (A) TEM images of UiO-66-(OH)₂@UiO-66-Br particles and their SAED patterns. (B) TEM images of UiO-66-(OH)₂@UiO-66-Br treated with HNO₃ at different times, SAED pattern and SEM image are provided on the right. (C) TEM images of UiO-66-(OH)₂@UiO-66-Br after different times of ROS treatment, SAED pattern and SEM images are provided on the right. (D) Powder X-ray diffraction patterns of hollow UiO-66-Br. (E) N₂ adsorption isotherms of solid UiO-66-Br and hollow UiO-66-Br obtained. (F) Normalized molar fraction of DOBDC in UiO-66-(OH)₂@UiO-66-Br after treatment with HNO₃ and ROS for different times. (G) FT-IR spectra of UiO-66-(OH)₂ etched by 2.5 M HNO₃ for various time. Area 1 is the benzene skeleton vibration. Area 2 is the symmetric stretching of -NO₂. Area 3 is the out-of-plane bending of C=C-H of benzene ring, (H) ¹H NMR spectra of UiO-66-(OH)₂ digested after HNO₃ etching (2.5 M) for different times. (A-H) Adapted with permission^[245]. Copyright 2019, American Chemical Society. ROS: Reactive oxygen species; DOBDC: 2,5-dihydroxyterephthalic acid.