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Solar photo-Fenton degradation of nalidixic acid in waters and wastewaters of different composition. Analytical assessment by LC-TOF-MS.
Water Res. 2011 Feb; 45(4):1736-44.WR

Abstract

This work assessed the solar photo-Fenton degradation of nalidixic acid (NXA), a quinolone antibacterial agent, in several different aqueous solutions. It has been proven that the composition of the water clearly affects the efficiency of the photo-Fenton process. The presence of chlorine ions induces the concurrence of different mechanisms involving Cl() and Cl(2)(-) radicals, which slow down the process. Up to 35 transformation products (TPs) were identified and their structures characterized by accurate LC-TOF-MS mass measurements during treatment of the different model waters. Photocatalytic degradation was thus observed to proceed mainly through the attack of the hydroxyl radicals on the double bond C((2))C((3)) which induce further ring opening. All the TPs identified persisted after total degradation of NXA. NXA in real pharmaceutical effluent was treated by photo-Fenton as a first stage before biological treatment. As NXA has been demonstrated to be recalcitrant to biological treatment, photo-Fenton treatment of the effluent was continued until its total degradation. Although NXA was efficiently degraded, LC-MS analyses demonstrated that some of the TPs identified after the photo-Fenton treatment were also recalcitrant to biological treatment, persisting after the combined treatment. These results show that analytical assessment of photocatalytic water treatments is essential to assure they are functioning as intended.

Authors+Show Affiliations

Plataforma Solar de Almería, CIEMAT, Carretera Senés, km 4, 04200 Tabernas, Almería, Spain.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

21146848

Citation

Sirtori, Carla, et al. "Solar photo-Fenton Degradation of Nalidixic Acid in Waters and Wastewaters of Different Composition. Analytical Assessment By LC-TOF-MS." Water Research, vol. 45, no. 4, 2011, pp. 1736-44.
Sirtori C, Zapata A, Gernjak W, et al. Solar photo-Fenton degradation of nalidixic acid in waters and wastewaters of different composition. Analytical assessment by LC-TOF-MS. Water Res. 2011;45(4):1736-44.
Sirtori, C., Zapata, A., Gernjak, W., Malato, S., Lopez, A., & Agüera, A. (2011). Solar photo-Fenton degradation of nalidixic acid in waters and wastewaters of different composition. Analytical assessment by LC-TOF-MS. Water Research, 45(4), 1736-44. https://doi.org/10.1016/j.watres.2010.11.023
Sirtori C, et al. Solar photo-Fenton Degradation of Nalidixic Acid in Waters and Wastewaters of Different Composition. Analytical Assessment By LC-TOF-MS. Water Res. 2011;45(4):1736-44. PubMed PMID: 21146848.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Solar photo-Fenton degradation of nalidixic acid in waters and wastewaters of different composition. Analytical assessment by LC-TOF-MS. AU - Sirtori,Carla, AU - Zapata,Ana, AU - Gernjak,Wolfgang, AU - Malato,Sixto, AU - Lopez,Antonio, AU - Agüera,Ana, Y1 - 2010/11/24/ PY - 2010/07/27/received PY - 2010/11/16/revised PY - 2010/11/17/accepted PY - 2010/12/15/entrez PY - 2010/12/15/pubmed PY - 2011/4/26/medline SP - 1736 EP - 44 JF - Water research JO - Water Res. VL - 45 IS - 4 N2 - This work assessed the solar photo-Fenton degradation of nalidixic acid (NXA), a quinolone antibacterial agent, in several different aqueous solutions. It has been proven that the composition of the water clearly affects the efficiency of the photo-Fenton process. The presence of chlorine ions induces the concurrence of different mechanisms involving Cl() and Cl(2)(-) radicals, which slow down the process. Up to 35 transformation products (TPs) were identified and their structures characterized by accurate LC-TOF-MS mass measurements during treatment of the different model waters. Photocatalytic degradation was thus observed to proceed mainly through the attack of the hydroxyl radicals on the double bond C((2))C((3)) which induce further ring opening. All the TPs identified persisted after total degradation of NXA. NXA in real pharmaceutical effluent was treated by photo-Fenton as a first stage before biological treatment. As NXA has been demonstrated to be recalcitrant to biological treatment, photo-Fenton treatment of the effluent was continued until its total degradation. Although NXA was efficiently degraded, LC-MS analyses demonstrated that some of the TPs identified after the photo-Fenton treatment were also recalcitrant to biological treatment, persisting after the combined treatment. These results show that analytical assessment of photocatalytic water treatments is essential to assure they are functioning as intended. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/21146848/Solar_photo_Fenton_degradation_of_nalidixic_acid_in_waters_and_wastewaters_of_different_composition__Analytical_assessment_by_LC_TOF_MS_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0043-1354(10)00799-2 DB - PRIME DP - Unbound Medicine ER -