Photocatalytic degradation of microcystin-LR in aqueous solutions |
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Authors: | Loraine CV Jacobs Patricio Peralta-Zamora Francinete Ramos Campos Roberto Pontarolo |
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Institution: | 1. Departamento de Química, Universidade Federal do Paraná, CP 19081, CEP 81531-980 Curitiba, PR, Brazil;2. Departamento de Farmácia, Universidade Federal do Paraná, Avenida Prefeito Lothário Meissner, 632, CEP 80210-170 Curitiba, PR, Brazil |
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Abstract: | In this work, the photocatalytic degradation of aqueous microcystin-LR was studied using TiO2 and ZnO as photocatalysts. The process was optimised and characterised at the bench scale (200 mL); both semiconductors exhibited a high degradation capacity at reaction times of 1 min (degradation greater than 95%). The transient species that were observed indicate that the degradation occurs via the multiple hydroxylation and elimination of the labile peptide residues of the molecule. When photocatalysis was applied in a continuous treatment system (20–50 L), the photocatalytic process exhibited a high degradation efficiency, which resulted in residual microcystin-LR concentrations that were less than 1 μg L?1 (C0 = 5 μg L?1). |
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