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Samuels M.,Galilee College | Samuels M.,Environmental Physical Chemistry Laboratory | Mor O.,Environmental Physical Chemistry Laboratory | Rytwo G.,Environmental Physical Chemistry Laboratory | Rytwo G.,Galilee College
Journal of Photochemistry and Photobiology B: Biology | Year: 2013

The influence of methylene blue adsorption to different clays on its photodegradation was studied. Methylene blue in solution was decomposed by sunlight in a zero-order process. Adsorption to some clay minerals (sepiolite and vermiculite) and a zeolite (clinoptilolite) accelerated the degradation process, and converted it to a first-order reaction. On the other hand, adsorption to other clay minerals (palygorskite and montmorillonite) stabilized the dye and prevented its degradation. Interestingly, in the clay-dye complexes that exhibited stability, clear metachromasy of the adsorbed methylene blue occurred, whereas the effect was not observed in the clay-dye complexes that underwent photodegradation. © 2013 Elsevier B.V. All rights reserved.

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