Simultaneous Effect of Reaction Temperature and Concentration of Surfactant in Organo-Bentonite Synthesis

Abstract

Transmission infrared spectroscopy (FTIR) was used to study the effect of the temperature and concentration of octadecylamine (surfactant) in the conformation state of amine chains incorporated in a bentonite matrix by organophilization process. The temperature is the most important factor in conformational changes-gauche/trans. Whereas the simultaneous increase of the temperature and concentration of surfactant favors the disordered conformation-gauche. This result is very important in the development of organo-bentonite based polymeric nanocomposites because the intercalation of the polymer in the galleries of the organo-bentonite is dependent on the conformation of the alkyl chains.

Antimicrobial bentonite by the addition of geranyl acetate for aflatoxin B1 adsorption

“…The bentonite used in this work was from a Boane deposit in Mozambique, with cation exchange capacity (CEC) of de 67 mmol⋅100 g -1 determined by Silva et al (2010) andMassiga et al (2010) (Macuvele, et al, 2017). The geranyl acetate was synthesized through heterogeneous catalysis using theion exchange resin Lewatit ® GF 101 from the geraniol esterification reaction with aceticanhydride, as described by Zeferino, et al (2021).…”

“…Synthesis conditions were performed, considering the temperature of 60±5 ºC and concentration of surfactant the 85 mmol•100 g -1 . After intercalation, all ODA-bentonite samples were washed, and separated by filtration, all samples were dried in an oven at 80 ºC for 24 h. The organophilization step was based on the methodology suggested by according to Macuvele, et al (2017). After organophilization, a composite was prepared in the following proportions: 2.5 g organophilic bentonite: 40 mL acetone: 0.75 g geranyl acetate (Bent/ODA/0.75 GA).…”