Synthesis, Characterization and Photocatalytic Activity of CoFe2O4/Fe2O3 Dispersed in Mesoporous KIT-6

Abstract

The present work aimed to synthesize and characterize a solid based on CoFe2O4/Fe2O3-KIT-6 and evaluate its performance in the photocatalytic degradation of the remazol red ultra RGB dye. By analyzing XRD, N2 physisorption, and Mössbauer results, it was possible to identify that the desired CoFe2O4/Fe2O3 phase was achieved, which maintained its structural properties. The FTIR-pyridine indicated the presence of Lewis acid sites, while TPD-CO2 showed a large amount of weak basic sites. The band-gap energy indicated that the compound can be applied in photocatalytic degradation under UV/visible light, with the possibility of magnetic separation at the end of the reaction. The photocatalysis results indicated that there was complete degradation of the remazol red ultra RGB dye within 1 h of reaction. Despite the absence of H2O2, the combination of the proposed photocatalyst with the anatase phase (TiO2) showed significant improvements in the degradation process. The proposed mechanism for complete dye degradation indicated that a sequence of radical reactions is necessary, generating oxidant species such as •OH and the final products were CO2 and H2O.

Space‐confined growth of CsPbBr3 nanocrystals in mesoporous KIT‐6 and application in LEDs

“…First, the chosen KIT-6 has a three-dimensional (3D) two-helix structure containing a long-range and highly ordered pore with uniform and suitable size of 7 to 11 nm, a large specific surface area, as well as most important thermostability, which can ensure precisely confined growth of NCs with uniform size and quantum confinement regime. 33,34 Secondly, a general hot-injection process is adopted to ensure CsPbX 3 precursors embedded in uniform pores grow into highquality CsPbX 3 NCs in situ. Organic ligands and matrix encapsulation play a dual protective role to avoid the damage of NCs by the external environment.…”

“…Herein, we report a novel encapsulation strategy to synthesize monodispersed, highly luminescent, and stable full‐color CsPbX 3 NCs in MS of KIT‐6 via a simple one‐step solution method. First, the chosen KIT‐6 has a three‐dimensional (3D) two‐helix structure containing a long‐range and highly ordered pore with uniform and suitable size of 7 to 11 nm, a large specific surface area, as well as most important thermostability, which can ensure precisely confined growth of NCs with uniform size and quantum confinement regime 33,34 . Secondly, a general hot‐injection process is adopted to ensure CsPbX 3 precursors embedded in uniform pores grow into high‐quality CsPbX 3 NCs in situ.…”