Evidences of segregated SnO2 type nanoparticles coating layered double hydroxide at moderate temperature

New SnO2/MgAl-layered double hydroxide composites as photocatalysts for cationic dyes bleaching

“…5). Similar results have been obtained by Intissar et al [10] when they have tried to incorporate Sn 4+ in the octahedral layer of Co/Al-hydrotalcite using coprecipitation method, at constant pH. Moreover, it can be observed that hydrotalcite particles, which are not involved in the segregation have a needle-like shape (Fig.…”

“…Moreover, when NaOH is used as hydrolysing agent, the samples calcined at 723 K shows a 504 m 2 /g surface area while the sample MW calcined shows 408 m 2 /g. The increase of the surface area during calcination is well correlated to Intissars' observations [10], the same parameter showing a decrease as the tin loading increases due to the increase of pore size (Table 3). In addition, it is expected that the amount of MB adsorbed onto catalyst to be depend on its surface area.…”

“…Moreover, the presence of absorption at about 220 nm can be noticed in the UV-Vis spectra of the samples. This absorption can be associated with the amorphous nature of SnO 2 [10], suggesting that tin cations are surrounded by a smaller number of oxygen anions than in octahedral coordination which is similar to SnO 2 -like xerogel [38]. Once the tin loading increases, the decrease of the ratio between the absorption intensities corresponding to tetrahedral or octahedral coordination can be noticed.…”

“…Velu et al [8,9] have reported partial isomorphous substitution of Al 3+ with Sn 4+ , in order to obtain a new Mg-Al-Sn ternary LDH. Using coprecipitation method, Intissar et al [10,11] have obtained a segregation of SnO 2 -type nanodomains in the interphasing MgAl-LDH sand-rose region. Using XAS and Möss-bauer spectroscopies, Intissar et al [12] have, also, proved that the incorporation of tetravalent cations in octahedral sheets does not occur, but actually an amorphous SnO 2 is formed and impregnates the hydrotalcite crystallites.…”

Nanosized silver–anionic clay matrix as nanostructured ensembles with antimicrobial activity

“…Hydrotalcite, like anionic clays or more generally speaking layered double hydroxides (LDHs), show the ability of LDHs to allow cells to grow well and to function properly or even to force living cells to make changes according to the nature of the particular biomolecules [11,12]. The LDH clay matrix is also able to bring into a cumulative structure not only the advantage of good biocompatibility and controlled textural features [13,14] but also high adsorption and ion exchange capacities [15]. It was also reported that the particular texture of the LDH allows bacteria and viruses to adsorb on the clay matrix [12] and thus to interact closely with the supported nanoparticles.…”