info:eu-repo/semantics/article
Treatment of ethylmercury chloride by heterogeneous photocatalysis with TiO2
Fecha
2021-04Registro en:
De La Fournière, Emmanuel M.; Meichtry, Jorge Martin; Gautier, Eduardo Amilcar; Leyva de Guglielmino, Ana Gabriela; Litter, Marta Irene; Treatment of ethylmercury chloride by heterogeneous photocatalysis with TiO2; Elsevier Science SA; Journal of Photochemistry and Photobiology A: Chemistry; 411; 113205; 4-2021; 1-10
1010-6030
CONICET Digital
CONICET
Autor
De La Fournière, Emmanuel M.
Meichtry, Jorge Martin
Gautier, Eduardo Amilcar
Leyva de Guglielmino, Ana Gabriela
Litter, Marta Irene
Resumen
Ethylmercury chloride (C2H5HgCl) was treated by UV/TiO2 photocatalysis in the presence of O2 and under N2 at pH 4.2. No report exists on C2H5Hg+ degradation by heterogeneous photocatalysis. The adsorption of C2H5Hg+ over TiO2 (no irradiation) was studied and fitted to the Freundlich isotherm. The photocatalytic evolution of C2H5Hg+ was adjusted to a two parameter Langmuir-Hinshelwood model, modified to include a third parameter attributed to the deactivation caused by the deposition of Hg(0). Hg(II) in solution, Hg(0) and Hg2Cl2 (detected only under N2) were the products of the photocatalytic degradation; the organic moiety was degraded but no organic by-product could be detected. Experiments in the absence of O2 showed a higher conversion rate, indicating that C2H5Hg+ is removed both by oxidative and reductive pathways, being this last step partially inhibited by O2. A degradation mechanism considering both oxidative and reductive one-electron transfer steps is proposed.