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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Amicarbazone degradation promoted by ZVI-activated persulfate: study of relevant variables for practical application

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Graca, Catia A. L. [1] ; Fugita, Lucas T. N. [1] ; de Velosa, Adriana Correia [1] ; Teixeira, Antonio Carlos S. C. [1]
Total Authors: 4
[1] Univ Sao Paulo, Dept Chem Engn, Av Prof Luciano Gualberto Tr 3, BR-380 Sao Paulo - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 25, n. 6, SI, p. 5474-5483, FEB 2018.
Web of Science Citations: 7

Alarming amounts of organic pollutants are being detected in waterbodies due to their ineffective removal by conventional treatment techniques, which warn of the urgent need of developing new technologies for their remediation. In this context, advanced oxidation processes (AOPs), especially those based on Fenton reactions, have proved to be suitable alternatives, due to their efficacy of removing persistent organic compounds. However, the use of ferrous iron in these processes has several operational constraints; to avoid this, an alternative iron source was here investigated: zero-valent-iron (ZVI). A Fenton-like process based on the activation of a recently explored oxidant-persulfate (PS)-with ZVI was applied to degrade an emerging contaminant: Amicarbazone (AMZ). The influence of ZVI size and source, PS/ZVI ratio, pH, UVA radiation, dissolved O-2, and inorganic ions was evaluated in terms of AMZ removal efficiency. So far, this is the first time these parameters are simultaneously investigated, in the same study, to evaluate a ZVI-activated PS process. The radical mechanism was also explored and two radical scavengers were used to determine the identity of major active species taking part in the degradation of AMZ. The degradation efficiency was found to be strongly affected by the ZVI dosage, while positively affected by the PS concentration. The PS/ZVI system enabled AMZ degradation in a wide range of pH, although with a lower efficiency under slightly alkaline conditions. Dissolved O-2 revealed to play an important role in reaction kinetics as well as the presence of inorganic ions. UVA radiation seems to improve the degradation kinetics only in the presence of extra O-2 content. Radicals quenching experiments indicated that both sulfate (SO4 (aEuro cent-)) and hydroxyl ((OH)-O-aEuro cent) radicals contributed to the overall oxidation performance, but SO4 (aEuro cent-) was the dominant oxidative species. (AU)

FAPESP's process: 13/50218-2 - CEPEMA - Cooperative Center of Environmental Engineering
Grantee:Claudio Augusto Oller do Nascimento
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/09543-7 - Residues of veterinary drugs in the environment
Grantee:Susanne Rath
Support type: Research Projects - Thematic Grants
FAPESP's process: 13/04656-8 - Degradation of pharmaceuticals by peroxidation combined with ultraviolet radiation and ozonation: antimicrobial activity and toxicity
Grantee:José Roberto Guimarães
Support type: Regular Research Grants