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The Determinative Role of the Exchange Cation and Layer-Charge Density of Smectite on Aflatoxin Adsorption

Published online by Cambridge University Press:  01 January 2024

Youjun Deng ,
Lian Liu ,
Ana Luisa Barrientos Velázquez  and
Joe B. Dixon
Youjun Deng*
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 77843-2474, College Section, TX, USA
Lian Liu
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 77843-2474, College Section, TX, USA
Ana Luisa Barrientos Velázquez
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 77843-2474, College Section, TX, USA
Joe B. Dixon
Affiliation:
Department of Soil and Crop Sciences, Texas A&M University, 77843-2474, College Section, TX, USA
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Using bentonites to adsorb aflatoxin is an effective method of minimizing the toxicity of aflatoxin to animals and humans. Early studies indicated a more than 10-fold difference in aflatoxin adsorption capacity among different bentonites. The determining mineralogical and chemical properties of the clays in aflatoxin adsorption are still poorly understood. The objective of this study was to test the hypothesis that a bentonite’s selectivity and adsorption capacity for aflatoxin is mainly determined by the ‘size matching’ requirement, on a nm scale, between the non-polar interlayer surface domains and the aflatoxin molecules. The non-polar surface domain size of smectites was varied by (1) selecting smectites with different charge densities; and (2) changing the valence and the size of exchange cations to control the amount of water in the hydration shells of the cations. Infrared spectroscopy and X-ray diffraction were also used to characterize the aflatoxin-smectite complexes to investigate if layer-charge density would affect the bonding strength between aflatoxin and the minerals. A large aflatoxin adsorption capacity and high selectivity for aflatoxin were achieved by selecting smectites that had low charge density as represented by their <110 meq/100 g cation exchange capacity. An individual smectite’s selectivity and adsorption capacity for aflatoxin could be enhanced or weakened by replacing the exchange cation. When the smectite was saturated with divalent cations that have smaller hydrated radius (e.g. Ba2+), the smectite’s adsorption capacity and affinity for aflatoxin were enhanced. Aflatoxin entered the interlayer of all six smectites tested. The strength of its bonding to the smectites was not affected by the layer-charge density of the smectites. The results confirmed the importance of nm-scale polarity and size match between aflatoxin molecules and the adsorbing sites on smectite. The high selectivity for aflatoxin can be achieved by selecting a smectite with adequate charge density or by replacing the exchange cations with divalent cations that have low hydration energy.

Keywords

Adsorption CapacityAffinityAflatoxin B1Layer-charge DensityExchange CationSize MatchingSmectite
Type
Article
Information
Clays and Clay Minerals , Volume 60 , Issue 4 , August 2012 , pp. 374 - 386
Copyright
Copyright © Clay Minerals Society 2012

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