Ce-doped UiO-67 nanocrystals with improved adsorption property for removal of organic dyes

Abstract

The Ce-doped UiO-67 nanocrystals were successfully synthesized via a one-step hydrothermal method. Ce doping increases the negative charge on the surface of the material, thus the adsorbent exhibits high adsorption capacity to cationic dyes.

Enhanced transformation of CO2 over microporous Ce-doped Zr metal–organic frameworks

“…39 However, the one for Ce-MOF is wider compared to that of the other three MOFs, indicating that the Ce ions in the material have been successfully coordinated with the C]O of the BDC ligand. 62 All materials show intense bands at 1580 cm À1 and 1390 cm À1 , corresponding to the asymmetric and symmetric stretching vibrations of the -COOH from BDC ligand. 63 The bands at 1500 cm À1 and 748 cm À1 could be assigned to the typical vibration of C]C and the bending vibration of C-H on the benzene ring, respectively.…”

Hierarchical nMOF-867/MXene Nanocomposite for Chemical Adsorption of Polysulfides in Lithium–Sulfur Batteries

“…The Ti 2p 3/2 peaks located at 454.8, 455.7, 456.6, and 458.4 eV correspond to Ti–C, Ti 2+ , Ti–X, and Ti–O, respectively. , The Zr 3d spectrum (Figure e) exhibits peaks at 182.7 and 185.1 eV, representing the Zr–O bond . As displayed in Figure f, the C 1s spectrum shows three components at 281.5, 284.8, and 288.6 eV, which are relevant to C–Ti–T x , CC (sp 2 -hybridized carbon on the benzene ring), and HO–CO, respectively. , The O 1s core-level spectrum (Figure g) is deconvoluted into six contributions at 529.7, 530.3, 531.3, 531.8, and 532.9 eV, attributed to Ti–O, Zr–O–Zr, Ti–C–(OH) x , Zr–OH, and O–CO, respectively. , As can be seen in Figure h, two deconvoluted peaks at 398.6 and 399.7 eV are indexed to pyridinic N and pyrrolic N, , signifying the presence of pyridine ring in the ligand of Zr-MOF. From Figure i, two obvious peaks are observed in the S 2p spectrum, where the binding energies at 163.6 and 164.8 eV are in accordance with S 2p 3/2 and S 2p 1/2 of element sulfur, respectively …”

“…Recently, Liu reported octahedral-structured Fe 3 O 4 @C derived from Fe-based MIL-53 for the cathode of lithium–sulfur batteries, which delivered cycling stability with an ultralow capacity decay of 0.002% per cycle over 300 cycles at 1 C . Attractively, Zr-based MOFs with good chemical structural stability could be conducive to the adaptation of the volume expansion of cathode during the charge/discharge process of lithium–sulfur batteries . It is worth noting that N atoms in n MOF-867 can serve as the Lewis base to bond with Li + of LiPSs , and the central metal ion Zr 4+ could combine with the polysulfides anion, which is considered as dual Lewis acid–base interactions greatly inhibit the shuttle effect.…”

Zirconium-Based MOFs and Their Biodegradable Polymer Composites for Controlled and Sustainable Delivery of Herbicides

“…A second weight loss can be seen at around 550 °C, indicating the decomposition of the MOF due to linker degradation. UiO-67 MOFs show a two step weight loss with the final thermal degradation being at around 525 °C …”

“…UiO-67 MOFs show a two step weight loss with the final thermal degradation being at around 525 °C. 44 3.2. Herbicide Adsorption.…”