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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.)

Comparison between UVA- and zero-valent iron-activated persulfate processes for degrading propylparaben

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Author(s):
Palharim, Priscila H. [1] ; Graca, Catia A. L. [2] ; Teixeira, Antonio C. S. C. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Dept Chem Engn, Res Grp Adv Oxidat Proc AdOx, Av Prof Luciano Gualberto 380, Tv 3, BR-05508900 Sao Paulo - Brazil
[2] Univ Porto, Dept Engn Quim, LSRE LCM, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto - Portugal
Total Affiliations: 2
Document type: Journal article
Source: Environmental Science and Pollution Research; v. 27, n. 18 MAR 2020.
Web of Science Citations: 3
Abstract

Conventional wastewater treatments are not efficient in removing parabens, which may thus end up in surface waters, posing a threat to aquatic biota and human health. As an alternative treatment, persulfate (PS)-driven advanced oxidation technologies have gained growing attention for removing these pollutants. In this study, the degradation of propylparaben (PrP) by UVA- and zero-valent iron (ZVI)-activated persulfate was investigated. The effects of initial PS concentration ({[}PS](0)) and irradiance or ZVI concentration were explored using the Doehlert experimental design. For the UVA-activated system, the specific PrP degradation rate (k) and percent removal were consistently higher for increasing {[}PS](0) and irradiance, varying in the ranges 0.0053-0.0192 min(-1) and 37.9-77.3%, respectively. In contrast, extremely fast PrP degradation was achieved through the ZVI/PS process (0.3304 < k < 0.9212 min(-1)), with removal percentages above 97.5%; in this case, paraben degradation was hindered for a ZVI dosage beyond 40 mg L-1. Regarding toxicity, ECOSAR predictions suggest that the degradation products elucidated by LC-MS/MS are less toxic than PrP toward fish, daphnid, and green algae. In addition, both processes showed to be strongly dependent on the water matrix, being ZVI/PS more impacted for a MBR effluent, although its performance was much better than that exhibited by the UVA-driven process (t(1/2) of 65.4 and 276.1 min, respectively). (AU)

FAPESP's process: 13/50218-2 - CEPEMA - Cooperative Center of Environmental Engineering
Grantee:Claudio Augusto Oller do Nascimento
Support Opportunities: Research Projects - Thematic Grants