Rapid mineralization rate of acetylsalicylic acid in a tubular photochemical reactor: the role of the optimized excess of H2O2

Silva, Douglas do Nascimento; Cunha Filho, Fernando José Vieira da; Lima, Andressa Mota; Ratkievicius, Luciana Avelino; Silva, Danielle Jaiane; Chiavone Filho, Osvaldo; Nascimento, Claudio Augusto Oller do

Rapid mineralization rate of acetylsalicylic acid in a tubular photochemical reactor: the role of the optimized excess of H2O2

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dc.contributor.author	Silva, Douglas do Nascimento
dc.contributor.author	Cunha Filho, Fernando José Vieira da
dc.contributor.author	Lima, Andressa Mota
dc.contributor.author	Ratkievicius, Luciana Avelino
dc.contributor.author	Silva, Danielle Jaiane
dc.contributor.author	Chiavone Filho, Osvaldo
dc.contributor.author	Nascimento, Claudio Augusto Oller do
dc.date.accessioned	2020-12-14T20:37:29Z
dc.date.available	2020-12-14T20:37:29Z
dc.date.issued	2019-10
dc.description.resumo	Acetylsalicylic acid (ASA) is a model pollutant and a representative of the emerging pharmaceutical micro- pollutants whose mineralization across several advanced oxidative processes takes hours to complete. This work devotes to optimize and understand the kinetic conditions to mineralize ASA using Photo-Fenton process with UVA radiation in a tubular photochemical reactor. The optimization employs a statistical tool termed factorial design (FD) that studies how the concentrations of ASA, Fe2+ and H2O2 affects the mineralization over a larger interval of concentrations. The factorial design indicates that the initial concentration of H2O2 is a crucial variable to achieve a fast rate of ASA mineralization. Using optimized contents of both H2O2 and Fe2+ (45 Mm and 1.5 mM, respectively) in the Photo-Fenton process (H2O2/Fe2+/UVA), mineralization around 90% is reached in about 10 min, the fastest rate ever observed, enabling to treat 0.012 m3 h−1 per tubular reactor. The underlying reason for such outstanding performance is attributed to the optimized 4.5-folds excess of [H2O2], i.e.the ratio of H2O2 concentration used at the initial time to that required for complete mineralization of the theoretic TOC. Measurements of the remaining concentration of H2O2 strongly indicates that excess of [H2O2] optimizes the instantaneous concentration of radical % OH. As a conclusion, the stoichiometric excess of [H2O2] is an important parameter to be optimized for achieving the highest degree of mineralization at the shortest time when using the photochemical reactor, in turn, decreasing costs related to the total energy consumed both by the lamp and by the recirculation pump	pt_BR
dc.identifier.citation	CUNHA FILHO, Fernando J.V.; LIMA, Andressa Mota; RATKIEVICIUS, Luciana A.; SILVA, Danielle J.; SILVA, Douglas N.; CHIAVONE FILHO, Osvaldo; NASCIMENTO, Claudio A. Oller do. Rapid mineralization rate of acetylsalicylic acid in a tubular photochemical reactor: the role of the optimized excess of h2o2. Journal of Water Process Engineering, [S.L.], v. 31, p. 100856-100856, out. 2019. Disponível em: https://www.sciencedirect.com/science/article/abs/pii/S2214714418308626?via%3Dihub. Acesso em: 06 out. 2020. http://dx.doi.org/10.1016/j.jwpe.2019.100856.	pt_BR
dc.identifier.doi	10.1016/j.jwpe.2019.100856
dc.identifier.issn	2214-7144
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30977
dc.language	en	pt_BR
dc.publisher	Elsevier	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Pharmaceutical pollutants	pt_BR
dc.subject	Emerging pollutants	pt_BR
dc.subject	Experimental design	pt_BR
dc.subject	Photo-Fenton	pt_BR
dc.subject	Photocatalysis	pt_BR
dc.title	Rapid mineralization rate of acetylsalicylic acid in a tubular photochemical reactor: the role of the optimized excess of H2O2	pt_BR
dc.type	article	pt_BR