Clopyralid degradation by AOPs enhanced with zero valent iron

JOURNAL OF HAZARDOUS MATERIALS

卷:392

Article

Barbosa Ferreira, M.¹  Souza, F. L.²  Munoz-Morales, M.²  Saez, C.²  Canizares, P.²  Martinez-Huitle, C. A.¹  Rodrigo, M. A.² 

[1] Univ Fed Rio Grande do Norte, Inst Chem, Campus Univ 3000, BR-59078970 Natal, RN, Brazil

[2] Univ Castilla La Mancha, Dept Chem Engn, Fac Chem Sci & Technol, Campus Univ S-N, E-13071 Ciudad Real, Spain

关键词: Clopyralid degradation;    ZVI;    Photolysis;    Electrolysis;    Coupled processes;    Reaction pathways;   

DOI  :  10.1016/j.jhazmat.2020.122282

来源: Elsevier

【 摘 要 】

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 LC-MS. 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.

【 授权许可】

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