Layered double hydroxides intercalated with anionic surfactants/benzophenone as potential materials for sunscreens

Abstract

Layered double hydroxides intercalated with dodecylsulfate or dodecylbenzenesulfonate were synthesized by co-precipitation under alkaline conditions. After characterization by PXRD, FTIR, and TGA/DTA, the ZnxAl/SUR compounds were reacted with neutral benzophenone, using different procedures. The products obtained from benzophenone adsolubilization were investigated by PXRD, FTIR, and DRUV-Vis spectroscopy before and after exposure to UV radiation. In general, the content of adsolubilized benzophenone was small and depended on the synthetic procedure. The best results were achieved under microwave irradiation, which furnished 9.09 wt% adsolubilized benzophenone. The products presented good adsorption in the full UV region, from UVC to UVA, and good stability to UV radiation. They did not cause skin irritation in tests conducted on rabbits, which makes them good candidates for the development of a new generation of sunscreens.

Adsolubilization of 2,4,6-trichlorophenol from aqueous solution by surfactant intercalated ZnAl layered double hydroxides

“…With further study of LDHs, anionic surfactants with long alkyl chain can be intercalated into the interlayer. The intercalation of anionic surfactants between layers of LDHs can change the original hydrophilic surface to hydrophobic accompanied by the increased interlayer spacing [35][36][37][38][39][40][41][42][43]. These significant variations endow modified LDHs new adsorptive properties for some organic molecules that general LDH materials do not.…”

Synthesis and Characterization of Polystyrene (PS)/Modified Ni‐Al LDH Nanocomposite: Role of Composition, Modifier and Synthesis Route of Layered Double Hydroxides (LDH)

“…The weight loss around 100 and 200 °C is due to physisorbed and interlayer water molecules, respectively. The weight loss above 500 °C ascribed to oxidation of organic matter and the formation of a respective mixture of oxides . According to the literature, the sulfate functional group got retained in the inorganic residue.…”

“…Thereafter, continuous weight loss took place due to fragmentation of SDBS molecules and attainment of the respective mixture of oxides at high temperature. With increasing Ni/Al ratio, thermal stability is increased due to tightly packing of alkyl chains in the interlayer spaces in both 3NiAl SDS and 3NiAl SDBS . The decrease in residue content in SDBS intercalated LDH than SDS intercalated SDS is due to the high thermal stability of SDBS molecules, this can be understood from the thermal stability of the nanocomposites shown in Table .…”

Ab initio simulations of the intercalation of iron(III) porphyrinates in Zn 2 Al-LDH: Structural analysis and evaluation of their basic and acid sites

“…A n − x/n .mH 2 O is a hydrated n-valent anion and x is the molar fraction between the trivalent cation and the total amount of cations. Many applications of these materials were already investigated and explored in the literature, such as mixed nanostructured oxides production through thermal treatment (Hadnadev-Kostic et al, 2011), exfoliation/delamination (Manohara et al, 2012), and the intercalation of anionic species (Nangoi et al, 2015) and adsolubilization of neutral molecules between organic surfactant anionic pillars (Cursino et al, 2013).…”