Facile preparation of ZIF-8@Pd-CSS sandwich-type microspheres via in situ growth of ZIF-8 shells over Pd-loaded colloidal carbon spheres with aggregation-resistant and leach-proof properties for the Pd nanoparticles

Fabrication of Magnetic Pd/MOF Hollow Nanospheres with Double-Shell Structure: Toward Highly Efficient and Recyclable Nanocatalysts for Hydrogenation Reaction

“…This is owing to the fact that the XPS analysis is only able to detect the amount and kinetic energy of electrons that escape from the surface (0–10 nm thickness) of the tested material, but the thickness of the outer ZIF-8 shell of Void n Fe 3 O 4 @Pd/ZIF-8@ZIF-8 is approximately 35 nm. The results fully confirmed that the inner material was completely wrapped by the outer ZIF-8 shell for Void n Fe 3 O 4 @Pd/ZIF-8@ZIF-8, corresponding to the analysis above.…”

“…Interestingly, the XPS wide scan spectra of Void nFe 3 O 4 @Pd/ ZIF-8@ZIF-8 (Figure 4d) showed strong peaks of Zn, C, and N species which belonged to the ZIF-8 shell. 44 However, the characteristic peaks of Pd and Fe could not be observed in the high-resolution XPS spectra (Figure 4e,f). This is owing to the fact that the XPS analysis is only able to detect the amount and kinetic energy of electrons that escape from the surface (0−10 nm thickness) of the tested material, but the thickness of the outer ZIF-8 shell of Void nFe 3 O 4 @Pd/ZIF-8@ZIF-8 is approximately 35 nm.…”

“…The other two satellite peaks at 343.6 and 338.3 eV were attributed to the 3d 3/2 and 3d 5/2 of Pd oxide, indicating that the surface of Pd NPs was partially oxidized because of exposure to the air. Interestingly, the XPS wide scan spectra of Void n Fe 3 O 4 @Pd/ZIF-8@ZIF-8 (Figure d) showed strong peaks of Zn, C, and N species which belonged to the ZIF-8 shell . However, the characteristic peaks of Pd and Fe could not be observed in the high-resolution XPS spectra (Figure e,f).…”

Fabrication of novel porous ZIF-67/PES composite microspheres and the efficient adsorption of triphenylmethane dyes from water

“…The peaks at 3135 and 2929 cm −1 were attributed to the C–H stretching vibrations of the aromatic and aliphatic rings in imidazole, whereas the peaks observed at 1584 and 800–1500 (755, 1301, 1303, 1419, and 1443 cm −1 ) were assigned to CN stretching and entire imidazole ring vibrations, respectively. 42 As shown in Fig. 1a, the peaks observed at 1669, 1447, and 1109 cm −1 were related to the stretching vibrations of the benzene ring, C–C bond, and C–O bond in the PES polymer, respectively.…”

Zeolitic Imidazolate Framework Cores Decorated with Pd Nanoparticles and Coated Further with Metal–Organic Framework Shells (ZIF-8@Pd@MOF-74) as Nanocatalysts for Chemoselective Hydrogenation Reactions

“…More recently, the encapsulation of metal nanoparticles (MNPs) into a core–shell structure appears be effective in improving the stability and recyclability of catalyst. − In particular, MOFs@MNPs@MOFs by sandwiching MNPs between two MOFs demonstrates great potential in enhancing catalytic reactivity and selectivity for selective hydrogenation reaction. − The MOF core could act as a support, inhibiting the aggregation of metal nanoparticles. The flexible nanopores of MOFs shell can transport reactants to the active metal surface and enhance the catalyst durability.…”