Layered Zinc Hydroxide Salts Intercalated with Anionic Surfactants and Adsolubilized with UV Absorbing Organic Molecules
authors Cursino, ACT; Rives, V; Carlos, LD; Rocha, J; Wypych, F
nationality International
journal JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
author keywords layered hydroxide salt; intercalation; sunscreen; adsolubilization; solar protection
keywords MICROWAVE-HYDROTHERMAL TREATMENT; NITRATE; ADSORPTION; DYES; FUNCTIONALIZATION; NANOCOMPOSITES; IRRADIATION; ABSORPTION; SUNSCREENS; BEHAVIOR
abstract Two anionic surfactants, dodecylsulfate (DDS) and dodecylbenzenesulfonate (DBS), were intercalated into layered zinc hydroxide salts (LHS) using the direct alkaline co-precipitation method, and characterized by powder X-ray diffraction (PXRD), Fourier-transform infrared (FTIR) and thermogravimetric analysis/differential thermal analysis (TGA/DTA). Different UV-absorbing organic molecules, like salicylates, cinnamates and benzophenones, were adsolubilized in the LHS interlayer following two different procedures (conventional microwave treatment and microwave with hydrothermal treatment). The adsolubilized products were investigated by PXRD, FTIR, diffuse reflectance UV-Vis (DRUV-Vis) and luminescence spectroscopies before and after exposure to UV radiation. Most of the products showed a good absorption in the UV region, from UVC to UVA, and good stability under UV radiation. The photodegradation tests showed that DDS-intercalated compounds were more stable than those intercalated with DBS. Adsolubilization in LHS can be an interesting alternative to immobilize neutral molecules with UV absorption capability, to prepare materials to be used in sunscreen formulations.
publisher SOC BRASILEIRA QUIMICA
issn 0103-5053
year published 2015
volume 26
issue 9
beginning page 1769
ending page 1780
digital object identifier (doi) 10.5935/0103-5053.20150152
web of science category Chemistry, Multidisciplinary
subject category Chemistry
unique article identifier WOS:000361556500005
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