Details

Autor(en) / Beteiligte

• Barbosa Ferreira, M.
• Souza, F.L.
• Muñoz-Morales, M.
• Sáez, C.
• Cañizares, P.
• Martínez-Huitle, C.A.
• Rodrigo, M.A.

Titel

Clopyralid degradation by AOPs enhanced with zero valent iron

Ist Teil von

• Journal of hazardous materials, 2020-06, Vol.392, p.122282-122282, Article 122282

Ort / Verlag

Netherlands: Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •Oxidation capacity increases in the sequence: UV < ZVI + UV < EO < ZVI + EO.•Higher rates of herbicides and mineralization were obtained in hybrid processes.•High synergistic coefficients were obtained for the coupling of ZVI to UV and EO.•Transformation products of clopyralid for each treatment have been identified.•Degradation pathways of clopyralid for each treatment evaluated were proposed. Four different technologies have been compared (photolysis, ZVI + photolysis, electrolysis and ZVI + electrolysis) regarding the: (1) degradation of clopyralid, (2) extent of its mineralization, (3) formation of by-products and main reaction pathways. Results show that photolysis is the less efficient treatment and it only attains 5 % removal of the pollutant, much less than ZVI, which reaches 45 % removal and that electrolysis, which attains complete removal and 78 % mineralization within 4 h. When ZVI is used as pre-treatment of electrolysis, it was obtained the most efficient technology. The identification of transformation products was carried out for each treatment by LCMS. In total, ten products were identified. Tentative pathways for preferential clopyralid degradation for all processes were proposed. This work draws attention of the synergisms caused by the coupling of techniques involving the treatment of chlorinated compound and sheds light on how the preferential mechanisms of each treatment evaluated occurred.