LDH and TiO2/LDH-type nanocomposite systems: A systematic study on structural characteristics

Abstract

a b s t r a c tThe work reported involves a detailed characterization study on a series of nanocomposite systems comprising layered double hydroxides and TiO 2 seeds with anatase crystal structure. The TiO 2 /LDH nanocomposite structural and textural features were varied by the isomorphous substitution within the LDH sheets network of the divalent cations (Zn 2+ by Cu 2+ ) and the trivalent cations (Al 3+ by Fe 3+ or Ti 4+ ) respectively. In depth characterization was obtained by using a combination of XRD, N 2 sorption, SEM, TEM/EDX and SAXS characterization techniques in order to maximize the structural information of the parent and modified LDH materials. An increase material compactness on the TiO 2 /LDH nanocomposites was observed due to the accommodation of the TiO 2 seeds within the mesopores together with a surface coating. SAXS observations indicated the modification of the morphology of the parent LDH samples by the addition of the TiO 2 seeds suggesting the rearrangement of the LDH layers during the nanocomposite formation.

Highly efficient Ru/TiO2 -NiAl mixed oxide catalysts for CO selective methanation in hydrogen-rich gas

“…To improve the catalytic performance of MMO, various composite materials with enhanced reactivity have been developed by maximizing their intrinsic properties (eg, increased SSA, metal dispersion, and structural stability) . In this regard, TiO 2 attracted our attention as it has been reported to be effective in CO‐SMET .…”

Removal of Dyes from the Environment by Adsorption Process

“…Researchers try to make some new adsorbents with high surface area to solve this problem. Recently, many papers have been published that show there is a tendency to synthesize high surface area materials such as modified silica and zeolites; ZnO and TiO 2 on clay; metal-organic frameworks; carbon nanocages; graphene; nanotubes; porous polymers and functional 3D boron nitride nanostructures to remove dyestuffs from water [34][35][36][37][38][39][40]. Not only the most of these adsorbents can be reused, but they are very efficient and fast, thanks to their high surface area.…”

Enhanced photocatalytic activity of TiO2-impregnated with MgZnAl mixed oxides obtained from layered double hydroxides for phenol degradation

“…Furthermore, TiO 2 /LDH composite photocatalysts have much higher sedimentation velocities than TiO 2 nanoparticles, facilitating their removal by physical processes [21].…”

“…However, there is a decrease in the intensity of the reflection peaks, related to the LDH. This is probably due to the disorder caused by the randon incorporation of TiO 2 nanoparticles inside the LDH lamellar structure can lead to broad peaks and a low intensity[20,21,36,37] One can also observe an increase in the (003) inter-layer distance from 7.69 (MgAl-CO 3 ) to 7.72 Å (TiO 2 /MgAl-CO 3 ) and from 7.59 Å in MgZnAl-CO 3 -5 to 7.62 Å in TiO 2 /MgZnAl-CO 3 -5 caused by TiO 2 incorporation .INSERT FIG. 3…”