Synthesis, characterization and magnetic behavior of Mg–Fe–Al mixed oxides based on layered double hydroxide

Iron-Based Layered Double Hydroxide Implants: Potential Drug Delivery Carriers with Tissue Biointegration Promotion and Blood Microcirculation Preservation

“…The total substitution of Al 3+ cations by Fe 3+ in the LDH layers is still challenging. Heredia et al 4 synthesized a series of Mg 3 M 3+ -CO 3 LDHs, varying the Fe/Al molar ratio from the Mg 3 Al-CO 3 to the Mg 3 Fe-CO 3 material. As the iron amount increased in the layers, a progressive loss of the material's crystallinity was observed.…”

“…The presence of both trivalent cations in the Zn-LDH propitiated the formation of a mixed spinel after calcination, instead of the separated spinel phases ZnAl 2 O 4 and ZnFe 2 O 4 , usually observed for matrices of zinc/aluminum or magnesium/ aluminum composition, respectively. 32 Heredia et al 4 submitted a series of Mg 3 M 3+ -CO 3 LDHs, including a material similar to the ternary Mg 4 FeAl-Cl presented in this work (Fe/Al molar ratio equal to 1), to air calcination at 550 °C for 9 h. The authors observed X-ray diffraction peaks related to the MgO for all samples, and for those containing iron in particular, it was also observed the formation of spinel MgFe 2 O 4 was also observed but not the MgAl 2 O 4 phase, possibly because of the lower temperature applied.…”

“…Layered double hydroxides containing iron cations in their intralayer composition have received considerable attention in the field of catalysts for electrochemical water splitting, , magnetic materials, − photon Fenton reaction, and adsorbents since their physical and chemical properties can be tuned by the interlayer species and also by the content and ratio of metal cations’. Besides, iron is an earth-abundant and endogenous element, which amplifies its sphere of applications and justifies efforts to develop iron-based materials.…”

Influence of Fe-clustering on the water oxidation performance of two-dimensional layered double hydroxides

“…The absorption band below 300 nm could be ascribed to the ligand-to-metal charge transfer (from the hydroxyl ligands to Fe( iii ) cations), while the shoulders centred in the range 300–400 nm and around 500 nm might be associated with oligomeric and aggregated large-sized iron clusters, respectively. 43–45 Sample MgFe depicts slightly larger shoulders in both regions, that could be interpreted as the first evidence of the role of TEA on the Fe-clustering modulation. Moreover, X-ray photoelectron (XPS) spectroscopy was performed to evaluate the chemical composition and oxidation state of iron.…”

Mixed Metal Oxide by Calcination of Layered Double Hydroxide: Parameters Affecting Specific Surface Area

“…), and A n− is an exchangeable anion such as CO 3 2− , NO 3 2− , SO 4 2− , etc. Due to the variation in metal composition, even ternary or quaternary metal composition is possible [ 19 , 20 , 21 , 22 , 23 , 24 ], high anionic exchange capacity, and anisotropic structure, LDHs are widely studied as catalyst, catalytic support, drug delivery carrier, pollutant adsorbent, etc. [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ].…”