Abstracts Book - IMRC 2018

• SB1-P059
REMOVAL OF BROMOPHENOL BLUE DYE FROM AQUEOUS
SOLUTIONS THROUGH THE SYNTHESIS AND CHARACTERIZATION
OF A POLYMER-CLAY COMPOSITE
Gabriela Diana Remigio Reyes 1 , Javier Illescas 1 , Maria del Carmen Diaz Nava 1
1 Instituto Tecnológico de Toluca, Division de estudios de posgrado e investigacion, Mexico.
In this study, the synthesis of a polymer-clay composite was carried out by in situ
copolymerization of two biopolymers, Alginate and Chitosan, with the intercalation
of an organo-modified clay, for the removal of the bromophenol blue dye. To
achieve this, a natural Mexican bentonite was used, which was modified with a
cationic surfactant, hexadecyltrimethylammonium bromide (HDTMA-Br), in order
to exchange cations present on the clay galleries, for the cations of the surfactant;
therefore, changing its nature hydrophilic to hydrophobic. In the case of both
natural and modified clay, a laminar structure was observed and confirmed by
scanning electron microscopy (SEM), and the main peak of montmorillonite was
found through the X-ray diffraction (XRD). Besides, the presence of the cations of
the surfactant, when the clay was modified, was also confirmed by infrared
spectroscopy by Fourier transform (FTIR) and its thermal stability was measured by
thermogravimetric analysis (TGA). The synthesis of the copolymers was carried out
using different ratios between both biopolymers. Once the copolymers were
obtained, they were characterized by means of TGA, FTIR and SEM. On the other
hand, the organo-modified clay was used to obtain the polymer-clay composites,
and the obtained materials were characterized with the same techniques employed
previously. Finally, composites were employed in batch systems for the adsorption
of bromophenol blue-dye solutions with different concentrations at 25 °C, and their
adsorption kinetics were evaluated.
Acknowledgment: We thank Dr. Ernesto Rivera Instituto de Investigación y
Materiales (UNAM) for his kind suggestions and comments. We also thank to
;Eriseth Reyes for their assistance with thermal analisys (TGA and DSC), Omar
Novelo and Josué Romero for their assistance and kind discussions of SEM
micrographs and Adriana Tejeda for her assistance with XRD determination.
Gabriela Diana Remigio Reyes is grateful to CONACyT for scholarship. We also
thank CONACyT (Project Cátedras CONACyT-3056)
Keywords: composites, adsorption, biopolymers
Presenting authors email: gdrr_iq@hotmail.com