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The Adsorption of β‐Carotene I. by bleaching earths
Author(s) -
Khoo L. E.,
Morsingh F.,
Liew K. Y.
Publication year - 1979
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/bf02660071
Subject(s) - chemisorption , adsorption , chemistry , acetone , carotene , arrhenius equation , inorganic chemistry , activation energy , organic chemistry
Activities of various bleaching earths for removal of β‐carotene from acetone solution were found to be in the decreasing order tonsil, fuller's earth, silica, and kaolin. Experimental evidence indicated that except for silica, in addition to physical adsorption, processes involving chemisorption and subsequent chemical reaction proceeded on the surface of the clay minerals. An Arrhenius activation energy of the order of 10 kcal mol −1 was found for the adsorption of β‐carotene from a solution in acetone on tonsil. Metallic ions, such as Fe 3+ , are suggested to be the active sites for chemisorption and reaction. Oxygen was not essential for activity.