Figure 1. Scanning electron micrographs of the (a)UiO-66(Zr)-NH2and (b)UiO-66(Zr/Ti)-NH2nanoparticles. (c) X-ray diffraction patterns of UiO-66(Zr)-NH2 and UiO-66(Zr/Ti)-NH2. (d) N2 adsorption–desorption isotherms of UiO-66(Zr)-NH2 and UiO-66(Zr/Ti)-NH2. (e) X-ray photoelectron spectroscopy (XPS) patterns of UiO-66(Zr)-NH2 and UiO-66(Zr/Ti)-NH2. (f) Ti 2p XPSspectra of UiO-66(Zr/Ti)-NH2.