... Luciana de la Fuente , Tatiana Acosta , Paola Babay , Gustavo Curutchet § , Roberto... more ... Luciana de la Fuente , Tatiana Acosta , Paola Babay , Gustavo Curutchet § , Roberto Candal § and Marta I. Litter* §. Gerencia Qu mica, Comisi n Nacional de Energ a At mica, Avenida General Paz 1499, 1650 San ...
The applicability of different photochemical advanced oxidation technologies (PAOTs), namely, dir... more The applicability of different photochemical advanced oxidation technologies (PAOTs), namely, direct UV-C photolysis, UV-C/H 2 O 2 and UV-A/TiO 2 heterogeneous photocatalysis (HP), and photo-Fenton reactions (UV-A/ H 2 O 2 /Fe 2+ , PF), for the degradation of 300 mg L -1 nonylphenol ethoxylate-9 (NPE-9) in water is described. Different kinetic regimes for each PAOT were found, and as a result, comparative efficiencies could be obtained only from final parameters such as NPE-9 conversion, TOC decrease, and aldehyde production after 3 h of treatment. The initial photonic efficiencies indicate, however, that UV-A processes make better use of photons than UV-C processes. Preliminary optimization of PF systems showed that the most efficient NPE-9/H 2 O 2 / Fe 2+ molar ratio was 1:1:0.5. Degradation products were partially investigated. Fortunately, toxic 4-nonylphenol was never found as a byproduct of the degradation after any of the treatments. Aldehydes were formed in all of the processes, but they appeared at a low extent in PF reactions. Therefore, PF treatments were considered to be the best degradation processes.
... Luciana de la Fuente , Tatiana Acosta , Paola Babay , Gustavo Curutchet § , Roberto... more ... Luciana de la Fuente , Tatiana Acosta , Paola Babay , Gustavo Curutchet § , Roberto Candal § and Marta I. Litter* §. Gerencia Qu mica, Comisi n Nacional de Energ a At mica, Avenida General Paz 1499, 1650 San ...
The applicability of different photochemical advanced oxidation technologies (PAOTs), namely, dir... more The applicability of different photochemical advanced oxidation technologies (PAOTs), namely, direct UV-C photolysis, UV-C/H 2 O 2 and UV-A/TiO 2 heterogeneous photocatalysis (HP), and photo-Fenton reactions (UV-A/ H 2 O 2 /Fe 2+ , PF), for the degradation of 300 mg L -1 nonylphenol ethoxylate-9 (NPE-9) in water is described. Different kinetic regimes for each PAOT were found, and as a result, comparative efficiencies could be obtained only from final parameters such as NPE-9 conversion, TOC decrease, and aldehyde production after 3 h of treatment. The initial photonic efficiencies indicate, however, that UV-A processes make better use of photons than UV-C processes. Preliminary optimization of PF systems showed that the most efficient NPE-9/H 2 O 2 / Fe 2+ molar ratio was 1:1:0.5. Degradation products were partially investigated. Fortunately, toxic 4-nonylphenol was never found as a byproduct of the degradation after any of the treatments. Aldehydes were formed in all of the processes, but they appeared at a low extent in PF reactions. Therefore, PF treatments were considered to be the best degradation processes.
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