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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Kaolinite-polymer compounds by grafting of 2-hydroxyethyl methacrylate and 3-(trimethoxysilyl)propyl methacrylate

Full text
Author(s):
Ferreira, Breno F. ; Ciuffi, Katia J. ; Nassar, Eduardo J. ; Vicente, Miguel A. ; Trujillano, Raquel ; Rives, Vicente ; de Faria, Emerson H.
Total Authors: 7
Document type: Journal article
Source: APPLIED CLAY SCIENCE; v. 146, p. 526-534, SEP 15 2017.
Web of Science Citations: 5
Abstract

Novel kaolinite-polymer solids containing methacrylate groups were prepared by functionalization of the Brazilian Sao Simao kaolinite with the monomers 2-hydroxyethyl methacrylate (HEMA) and 3-(trimethoxysilyl) propyl methacrylate (TMSPM). Functionalization involved reflux of the monomers in the presence of kaolinite previously intercalated with dimethylsulfoxide (DMSO). HEMA and TMSPM effectively displaced DMSO molecules from the clay mineral interlayer, forming Al-O-C bonds in organic-inorganic hybrid matrices. The resulting materials were characterized by powder X-ray diffraction, thermal analysis, infrared spectroscopy and TEM analysis. Powder X-ray diffraction evidenced the intercalation of DMSO, and its substitution by HEMA and TMSPM. Thermal analyses indicated that HEMA- and TMSPM-functionalized kaolinite materials were thermally stable up to 300 degrees C. The shift of the infrared bands due to interlayer hydroxyl groups and the presence of bands due to characteristic vibrations of the methacrylate groups (3349, 3331, 3290, and 1589 cm(-1)) also confirmed the functionalization of the kaolinite with the monomers. The ability of both monomers to graft methacrylate groups onto kaolinite interlayer space was also analyzed. The solids obtained were used as adsorbents of dye methylene blue (MB), showing that the clay nanocomposites could remove the dye more efficiently than the isolated precursors (pure kaolinite and the polymers) separately. The kinetics of the process followed a pseudo second order model and equilibrium fitted well to the Freundlich model. (AU)

FAPESP's process: 16/01501-1 - Multifunctional catalysts for advanced oxidation processes employing biogenic matrices or clays
Grantee:Katia Jorge Ciuffi Pires
Support type: Regular Research Grants
FAPESP's process: 16/50322-2 - Materials with advanced technological and environmental applications
Grantee:Katia Jorge Ciuffi Pires
Support type: Regular Research Grants
FAPESP's process: 13/19523-3 - Functional Biohybrid materials based on layered and/or fibrous natural clays with multifaceted applications
Grantee:Emerson Henrique de Faria
Support type: Regular Research Grants