Micro–mesoporous iron oxides with record efficiency for the decomposition of hydrogen peroxide: morphology driven catalysis for the degradation of organic contaminants

Abstract

A template-free solid-state synthesis of a highly organized and morphologically controlled iron(iii)oxide micro–mesoporous Fenton catalyst is reported.

Base‐Free Transfer Hydrogenation of Nitroarenes Catalyzed by Micro‐Mesoporous Iron Oxide

“…The MMIO catalyst was characterized by field‐emission scanning electron microscopy (FESEM), high‐resolution transmission electron microscopy (HRTEM), XRD, N 2 adsorption–desorption isotherm measurements, and Mössbauer spectroscopy . The FESEM image of iron oxide is depicted in Figure a, which shows the intact flower‐shaped morphology clearly.…”

“…The MMIO catalystw as characterized by field-emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), XRD, N 2 adsorption-desorption isotherm measurements, and Mçssbauer spectroscopy. [17] The FESEM image of iron oxide is depictedi nF igure 1a,w hich shows the intact flower-shaped morphology clearly.T he MMIO catalystc omprises several nanorods and shows nanosized particles (5-7 nm), which indicatest he ultrafine building units of 3D nanocomposites (Figure 1b). The lattice fringes of randomly oriented grains support and indicate the crystallinen ature of the MMIO catalyst.…”

“…In our efforts to develop morphology‐dependent catalytic protocols, we recently succeeded in a template‐free solid‐state synthesis of a micro‐mesoporous iron oxide (MMIO) catalyst by a simple two‐step synthetic procedure; the ensuing 3 D nanoassembly of hematite nanoparticles (5–7 nm) organized in a rod‐/flower‐like morphology displayed an excellent rate constant for the decomposition of H 2 O 2 and a considerable efficiency for the degradation of organic pollutants …”

“…Similar transformations have been achievedb ye mploying formates as hydrogen donors with other metal-based catalytic systems, [16a,b] which include mesoporous iron oxide nanoparticle assemblies for the chemoselective catalytic reduction of nitroarenes. [16c] In our efforts to develop morphology-dependentc atalytic protocols, [17] we recently succeeded in at emplate-free solidstate synthesis of am icro-mesoporous iron oxide (MMIO) catalyst by as imple two-step synthetic procedure;t he ensuing 3D nanoassembly of hematite nanoparticles (5-7 nm) organized in ar od-/flower-like morphologyd isplayed an excellent rate constant fort he decomposition of H 2 O 2 and ac onsiderable efficiency forthe degradationo fo rganic pollutants. [17]…”

3D macro-micro-mesoporous FeC2O4/graphene hydrogel electrode for high-performance 2.5 V aqueous asymmetric supercapacitors

“…It has been reported that ferrous oxalate with microporous and mesoporous structure has been prepared, and the porous structure brings a relatively large specific surface area [20]. At present, it is rarely reported about the application of micro-mesoporous ferrous oxalate to supercapacitors while ironic oxide is well known active materials.…”