Adsorption of Dextrin at mineral water interface

Bhaskar Raju, G and Forsling, Willis and Holmgren, Allan (1997) Adsorption of Dextrin at mineral water interface. Journal of Colloid and Interface Science, 193 (2). pp. 215-222.

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The adsorption mechanism of dextrin on aqueous minerals such as fluorite, apatite, galena, magnetite, gama-alumina, and graphite was studied by adsorption experiments, zeta potential measurements, and FT-IR studies. Depending on the nature of the mineral surface, dextrin was found to interact in three different ways viz by chemisorption, physisorption, or hydrophobic–hydrophobic interaction. The adsorption density of dextrin was found to be pH dependent. Maximum adsorption of dextrin was obtained around the pH at which the mineral surface is highly hydroxylated. The mechanism of dextrin interaction with the surface metal hydroxysites, (=MeOH) , was found to proceed via chemical complexation. A linear relationship was observed between the adsorption density of dextrin and the pH of maximum surface hydroxylation. Zeta potential measurements have indicated the possibility of dextrin adsorption by electrostatic interaction under the conditions where mineral surface and dextrin are oppositely charged. Furthermore dextrin was found to adsorb on hydrophobic minerals such as graphite by hydrophobic–hydrophobic interaction. However, the magnitude of adsorption by electrostatic and hydrophobic interaction was found to be very marginal compared to that of chemical complexation.

Item Type:Article
Official URL/DOI:doi:10.1006/jcis.1997.5004
Uncontrolled Keywords:fluorite; apatite; galena; magnetite; gama-alumina, adsorption model
Divisions:NML Chennai > Mineral Processing
ID Code:4009
Deposited By:Dr. G Bhaskar Raju
Deposited On:26 Sep 2011 10:05
Last Modified:13 Dec 2011 16:58
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