Activation of O₂ over three-dimensional manganese oxide nanoprisms under ambient conditions towards oxidative removal of aqueous organics

Abstract

Three-dimensional nanomaterials are generally beneficial to the catalytic performance because of larger specific surface aera, more exposed active sites, promoted mass transfer and shorter diffusion distance between reactants and catalysts....

Ce Doping Boosts the Photocatalytic Activity of Ultrathin Bi2MoO6 Nanosheets for Toluene Selective Oxidation

“…The stacking mode between the sheets is changed; thus, the three-dimensional space of 5-CBMOS is significantly stronger than that of BMOS. It assists in exposing more catalytic active sites, which is beneficial for the adsorption and activation of O 2 and reactants. , Figure e is the TEM image of 5-CBMOS, showing the ultrathin sheet structure, which is consistent with the SEM results. The crystal structure of 5-CBMOS is further magnified, and the lattice fringes with a spacing of 0.274 nm correspond to the {002} crystal plane of the orthorhombic phase Bi 2 MoO 6 (Figure f). , Energy-dispersive X-ray spectroscopy (TEM–EDX) results of the prepared samples indicate that Bi, Ce, Mo, and O elements contained in 5-CBMOS are uniformly distributed in the matrix material (Figure g), which further confirm the successful synthesis of the Ce-doped Bi 2 MoO 6 composite.…”

“…By comparing the SEM images of BMOS and 5-CBMOS, Ce doping has few effects on the thickness, but it can make the sheet size of Bi 2 MoO 6 increase slightly.The stacking mode between the sheets is changed; thus, the threedimensional space of 5-CBMOS is significantly stronger than that of BMOS. It assists in exposing more catalytic active sites, which is beneficial for the adsorption and activation of O 2 and reactants 42,43. Figure1eis the TEM image of 5-CBMOS, showing the ultrathin sheet structure, which is consistent with the SEM results.…”

“On–off” switch for H2 and O2 generation from HCOOH resp. H2O2

“…As shown in Figure 2B, the strong characteristic peaks centered at around 1602 and 1342 cm −1 are attributed to the graphitic carbon (G-band) and disordered carbon (D-band), respectively. 66 The values of I G /I D were 0.89, 0.92, and 1.0 for Pd/CNS-700, Pd/CNS-800, and Pd/CNS-900, respectively, indicating that the graphitic carbon was more readily obtained at higher calcination temperature. In Figure 2C, the diffraction peak at 2ϴ = 24°corresponds to the d-spacing of graphitic carbon (002) (JCPDS Card No.…”

“…These absorption peaks, except for the –OH group, were comparatively weaker in Pd/CNS‐700, Pd/CNS‐800, and Pd/CNS‐900, indicating that the surface functional groups were carbonized at high temperature. As shown in Figure 2B, the strong characteristic peaks centered at around 1602 and 1342 cm −1 are attributed to the graphitic carbon (G‐band) and disordered carbon (D‐band), respectively 66 . The values of I G / I D were 0.89, 0.92, and 1.0 for Pd/CNS‐700, Pd/CNS‐800, and Pd/CNS‐900, respectively, indicating that the graphitic carbon was more readily obtained at higher calcination temperature.…”

Oxygen Vacancy-Mediated Activates Oxygen to Produce Reactive Oxygen Species (ROS) on Ce-Modified Activated Clay for Degradation of Organic Compounds without Hydrogen Peroxide in Strong Acid

“…In order to further detect the species and vacancies of oxygen on the surface of the synthesized catalyst, the O1S was investigated (Figure 2c,d). The O1S of the XPS spectrum was decomposed into two parts, including saturated lattice oxygen (situated around 529.70 eV) and surface-absorbed oxygen species (situated around 531.30 eV) [54]. The CeAY surface-absorbed oxygen species concentration was dominantly higher than that of CeO 2 , and after the CeO 2 was added to the acid-treated clay, the saturated lattice oxygen completely disappeared.…”