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ABSTRACT
Catalytic ozonation of organic dyestuffs such as Methylene-Blue (MB) and Malachite Green (MG) was investigated in the presence of montmorillonite K10 and its Al-Fe modified counterpart (AF-K10). Adsorption was found to play akey-role involving specific acid-base, electrostatic, and/or hydrophilic/organophilic interactions according to the dye molecule and catalyst surface properties. MG turned out to be more reactive toward ozone alone but showed lower reactivity for ozone than MB in the presence of catalyst. The higher degradation yields of MG obtained after only 40 s ozonation using 0.0166 g O3 and AF-K10 can be explained by apossible clay-ozone synergy involving adsorption via both hydrophobic and additional acid–base interactions.
CREDIT author statement
MIRILA Diana Carmen: Conceptualization, Investigation, Methodology Writing-Original draft preparation, Software.
Farida Boudissa: Visualization, Investigation, Data curation.
Ana-Paola Beltrao Nunes: Visualization, Investigation.
Nicoleta Platon: Conceptualization, Supervision.
Mohamed Amine Didi: Software, Validation.
Rene Roy: Validation.
Denisa Nistor: Validation.
Abdelkrim AZZOUZ: Conceptualization, Writing and Editing, Data curation, Supervision, Validation.
Acknowledgments
We are also grateful to Mohamad El-Akhrass for his technical assistance.
Declaration of interests
The authors declare that they have noknown competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: