CONTEXT: Chlordecone (CLD) and β-hexachlorocyclohexane (β-HCH) are chlorinated pesticides that coexist as persistent organic pollutants in the groundwater of several countries in the Caribbean, being an environmental issue. This work evaluates theoretically the competitive formation of host-guest complexes pesticides@cyclodextrines (CDs) as an alternative for water purification and selective separation of pesticides. METHODS: Quantum mechanical calculations based on density functional theory (DFT) and classical molecular dynamics (MD) simulations were used to achieve information on geometries, energies, structure, and dynamics of guest-host complexes in the gas phase, implicit solvent medium, and in aqueous solutions. RESULTS: DFT studies showed that interactions of both pesticides with CDs are mediated by steric factors and guided by maximization of the hydrophobic interactions either with the other pesticide or with the CD cavity's inner atoms. MD results corroborate the formation of stable complexes of both pesticides with the studied CDs. α-CD exhibited a preference for the smaller β-HCH molecule over the CLD that could not perturb the formed complex. CONCLUSIONS: The simulation of competitive formation with γ-CD illustrated that this molecule could accommodate both pesticides inside its cavity. These results suggest that CDs with smaller cavity sizes such as α-CD could be used for selective separation of β-HCH from CLD in water bodies, while γ-CD could be used for methods that aim to remove both pesticides at the same time.

Department of Chemistry Faculty of Science University of South Bohemia in Ceske Budejovice Branisovska 31 370 05 Ceske Budejovice Czech Republic

Department of Chemistry KU Leuven B 3001 Louvain Belgium

Instituto Tecnológico de Santo Domingo Avenida de los Próceres 49 Los Jardines del Norte 10602 Santo Domingo Dominican Republic

Laboratoire COVACHIMM2E EA 3592 Université des Antilles BP 250 Pointe à Pitre Guadeloupe France

Laboratory of Inorganic Chemistry Vladimir Prelog Weg 1 8093 Zurich Switzerland

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