TITLE:
Physico-Chemical Study of the Adsorption of Carotenoids from Carrots on Raw and Modified Kaolinites
AUTHORS:
Orléans Ngomo, Etienne Dongo, Joseph Sieliechi
KEYWORDS:
Kaolinite, Carrots, Antioxidant, Cosmetic, Adsorption
JOURNAL NAME:
Advances in Chemical Engineering and Science,
Vol.13 No.2,
April
19,
2023
ABSTRACT: This study focuses on the
adsorption at temperatures below 70℃, of carotenoids from carrots on clay materials such as
kaolinite in the raw state, activated with a 0.5 M HCl solution or treated with a sodium solution of
Al+. The kinetic study of
carotenoid adsorption shows that equilibrium is reached after 30 minutes and
the temperature has little influence on carotenoid adsorption. On the other
hand, the quantities adsorbed at equilibrium increase with the initial
concentration of carotenoids. The kinetic model that best describes the
experimental data is that of the pseudo-second order, adsorption is made in two
time. For the carotenoid adsorption isotherms, the best correlation is obtained
with the Freundlich model. The low values of the Freundlich
constants indicate that the adsorption is probably of a physical type. This
conclusion is confirmed by the effective desorption of carotenoids observed
during desorption experiments.