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Fluorene oxidation by solar-driven photo-Fenton process: toward mild pH conditions.
Environ Sci Pollut Res Int. 2018 Oct; 25(28):27808-27818.ES

Abstract

Polycyclic aromatic hydrocarbons (PAHs) are on the list of priority pollutants to be eliminated from the environment due to their carcinogenic and mutagenic action, chemical stability, and resistance to biodegradation. The aim of this study was to evaluate the degradation of fluorene, a well-known PAH, in aqueous solutions (0.03 and 0.08 mg L-1), by means of a solar-driven conventional (PF) and modified photo-Fenton mediated by ferrioxalate complexes (PFF). Photolysis was also employed for comparison purposes. PF reaction was evaluated at different pH values (2.8, 3.5, and 4.0) and iron concentrations (2, 5, 10, and 20 mg L-1). On the other hand, PFF studies were conducted at mild pH conditions (4.0, 5.0, and 6.0) and iron content of 2 mg L-1, keeping initial iron/oxalate molar ratio at 1:3. In both PF and PFF, the initial hydrogen peroxide/iron molar ratio was maintained at 5. In the presence of methanol as cosolvent for fluorene dissolution, the PF reaction was hampered and no consumption of H2O2 was observed during the reaction carried out at constant pH (2.8). This led to low degradation rates, similar to those achieved by photolysis. Under the same pH but using acetonitrile as cosolvent for fluorene dissolution, fluorene degradation was found to be proportional to the iron content used in the PF experiments. On the other hand, at an invariable iron concentration of 5 mg Fe2+ L-1, the increase in pH was accompanied by a decrease in the molar fraction of the most photoactive iron complex (FeOH2+) and ferric hydroxides precipitation, leading to a reduction in the fluorene degradation rate. With regard to the PFF tests, similar fluorene degradation performance was achieved at pH 4 and 5, while at pH 6 iron precipitation became relevant and the degradation rate was slightly slower. PFF has shown to be more efficient than the PF under the same pH (4) and iron concentration (2 mg L-1). Moreover, even at near neutral pH (6), fluorine degradation was shown to be feasible by using ferrioxalate complexes.

Authors+Show Affiliations

Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal. isabelli@eq.ufrj.br. School of Chemistry, Federal University of Rio de Janeiro, Av. Athos da Silveira Ramos, 149, Rio de Janeiro, RJ, 21941-909, Brazil. isabelli@eq.ufrj.br.Chemical Engineering Program - COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21941-972, Brazil.Chemical Engineering Program - COPPE, Federal University of Rio de Janeiro, P.O. Box 68502, Rio de Janeiro, RJ, 21941-972, Brazil.Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465, Porto, Portugal. vilar@fe.up.pt.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30132283

Citation

Dias, Isabelli N., et al. "Fluorene Oxidation By Solar-driven photo-Fenton Process: Toward Mild pH Conditions." Environmental Science and Pollution Research International, vol. 25, no. 28, 2018, pp. 27808-27818.
Dias IN, Bassin JP, Dezotti M, et al. Fluorene oxidation by solar-driven photo-Fenton process: toward mild pH conditions. Environ Sci Pollut Res Int. 2018;25(28):27808-27818.
Dias, I. N., Bassin, J. P., Dezotti, M., & Vilar, V. J. P. (2018). Fluorene oxidation by solar-driven photo-Fenton process: toward mild pH conditions. Environmental Science and Pollution Research International, 25(28), 27808-27818. https://doi.org/10.1007/s11356-018-2939-5
Dias IN, et al. Fluorene Oxidation By Solar-driven photo-Fenton Process: Toward Mild pH Conditions. Environ Sci Pollut Res Int. 2018;25(28):27808-27818. PubMed PMID: 30132283.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fluorene oxidation by solar-driven photo-Fenton process: toward mild pH conditions. AU - Dias,Isabelli N, AU - Bassin,João Paulo, AU - Dezotti,Márcia, AU - Vilar,Vítor J P, Y1 - 2018/08/21/ PY - 2017/10/27/received PY - 2018/08/08/accepted PY - 2018/8/23/pubmed PY - 2019/1/5/medline PY - 2018/8/23/entrez KW - Advanced oxidation processes KW - Compound parabolic collectors KW - Ferrioxalate complexes KW - Fluorene KW - Photo-Fenton SP - 27808 EP - 27818 JF - Environmental science and pollution research international JO - Environ Sci Pollut Res Int VL - 25 IS - 28 N2 - Polycyclic aromatic hydrocarbons (PAHs) are on the list of priority pollutants to be eliminated from the environment due to their carcinogenic and mutagenic action, chemical stability, and resistance to biodegradation. The aim of this study was to evaluate the degradation of fluorene, a well-known PAH, in aqueous solutions (0.03 and 0.08 mg L-1), by means of a solar-driven conventional (PF) and modified photo-Fenton mediated by ferrioxalate complexes (PFF). Photolysis was also employed for comparison purposes. PF reaction was evaluated at different pH values (2.8, 3.5, and 4.0) and iron concentrations (2, 5, 10, and 20 mg L-1). On the other hand, PFF studies were conducted at mild pH conditions (4.0, 5.0, and 6.0) and iron content of 2 mg L-1, keeping initial iron/oxalate molar ratio at 1:3. In both PF and PFF, the initial hydrogen peroxide/iron molar ratio was maintained at 5. In the presence of methanol as cosolvent for fluorene dissolution, the PF reaction was hampered and no consumption of H2O2 was observed during the reaction carried out at constant pH (2.8). This led to low degradation rates, similar to those achieved by photolysis. Under the same pH but using acetonitrile as cosolvent for fluorene dissolution, fluorene degradation was found to be proportional to the iron content used in the PF experiments. On the other hand, at an invariable iron concentration of 5 mg Fe2+ L-1, the increase in pH was accompanied by a decrease in the molar fraction of the most photoactive iron complex (FeOH2+) and ferric hydroxides precipitation, leading to a reduction in the fluorene degradation rate. With regard to the PFF tests, similar fluorene degradation performance was achieved at pH 4 and 5, while at pH 6 iron precipitation became relevant and the degradation rate was slightly slower. PFF has shown to be more efficient than the PF under the same pH (4) and iron concentration (2 mg L-1). Moreover, even at near neutral pH (6), fluorine degradation was shown to be feasible by using ferrioxalate complexes. SN - 1614-7499 UR - https://www.unboundmedicine.com/medline/citation/30132283/Fluorene_oxidation_by_solar_driven_photo_Fenton_process:_toward_mild_pH_conditions_ L2 - https://dx.doi.org/10.1007/s11356-018-2939-5 DB - PRIME DP - Unbound Medicine ER -