Sciences & technologie. A, sciences exactes
Volume 0, Numéro 22, Pages 89-96
2004-12-31
Acid-base Properties Of Montmorillonite And Interactions With Enzymes Through Rem Investigations
Authors : Azzouz A . Niquette P . Asaftei S . Monette F . Hausler R . Nistor D . Miron D .
Abstract
Interactions of montmorillonite-rich clay materials with enzymes were investigated. A 2:1 layer type raw clay mineral was purified, then ion-exchanged with Na+, K+ (Na-Mt and K-Mt), Ca2+ and Mg2+ (CaMt and Mg-Mt), and further contacted with various enzyme suspensions containing -amylase, - amylase, cellulase, invertase, lipase, peroxidase, pectinase, urease, protease or tripsine. The acid and base properties were measured via thermal programmed desorption of NH3 and CO2, respectively. It was found that Ca-Mt and Mg-Mt exert stronger interactions with enzymes, generating coarser flake-shaped clay particles, as compared to Na-Mt and K-Mt. This specific behaviour is explained in terms of clay affinity towards enzymes, and correlated to the clay acid-base properties, that could have a great interest for soil chemistry. The shape and the size of clay particles were also discussed through reflection electron microscopy.
Keywords
montmorillonite, clay intercalation, ion-exchanged clays, NH3-TPD, CO2-TPD, acidbase properties, alkaline, alkaline earths, enzymes, environmental, coagulation-flocculation, immobilization.
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