Low Concentration Iron-Doped Alumina (Fe/Al2O3) Nanoparticles Using Co-Precipitation Method

Infrared photodissociation spectroscopy of (Al2O3)2–5FeO+: influence of Fe-substitution on small alumina clusters

“…Analysis of the structures of (Al 2 O 3 ) n FeO + ( n = 1–5) reveals that Al prefers trigonal planar or tetrahedral O atom coordination while Fe seems more flexible and adapts also to two-fold coordinated environments. 28 These observations are in line with the results for Fe-doped nanocrystals or nanoparticles, 12 in which dopant Fe atoms preferably replace Al atoms of the Al 2 O 3 network mostly in the surface layer 21 without inducing major distortions or even structural changes. 53 While structural deviations from the corresponding all-Al clusters are evident for the clusters with larger Fe : Al ratios ( n = 1–3), starting from Al 8 M O 13 + the cluster framework is virtually identical for M = Fe and Al, proving the suitability of iron as a dopant for Al 2 O 3 .…”

“…In agreement with the results for Fe-doped Al 2 O 3 nanoparticles 12 and solid corundum, the substitution of a single Al atom with an Fe atom has little influence on the structure of the larger clusters of the homolog series (Al 2 O 3 ) n FeO + ( n = 1–5). Only the first two members ( n = 1, 2) significantly change their structure, as can be concordantly seen from the experiment (spectra) and theory (structure prediction).…”

“…optical behavior, magnetism and catalytic activity. [5][6][7][8][9][10][11][12] Detailed experimental information about the change in local lattice structure due to incorporated Fe ions in solid Al 2 O 3 is scarce. While changes of the electronic structure can be probed via UV/Vis adsorption, 6,11,12 Mo ¨ssbauer 13,14 or electron paramagnetic resonance (EPR) 15 spectroscopy, modern X-ray methods such as extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) are necessary to determine coordination environments and bond distances of the metal centers.…”

“…[5][6][7][8][9][10][11][12] Detailed experimental information about the change in local lattice structure due to incorporated Fe ions in solid Al 2 O 3 is scarce. While changes of the electronic structure can be probed via UV/Vis adsorption, 6,11,12 Mo ¨ssbauer 13,14 or electron paramagnetic resonance (EPR) 15 spectroscopy, modern X-ray methods such as extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) are necessary to determine coordination environments and bond distances of the metal centers. Kou and co-workers, 16 as well as Tai and co-workers, 17 report an average Fe-O bond distance of 198-202 pm for Fe-doped g-Al 2 O 3 and a coordination number (CN) of 4.9 for iron, indicating a mixture of tetrahedral and octahedral coordination.…”

Tailoring the structure of polysulfone nanocomposite membranes by incorporating iron oxide doped aluminium oxide for excellent separation performance and antifouling property

“…22 3. Results and discussion 26,29 The peak which developed at 475 cm −1 is related to the Fe 2 O 3 (hematite) phase. 26 The surface charge of the Fe:Al nanoparticles shifted to lower pH in this study due to the presence of the dopant.…”