Degradation of Oxytetracycline in Aqueous Solutions: Application of Homogeneous and Heterogeneous Advanced Oxidative Processes

José Miguel Giler-Molina, Luis Angel Zambrano-Intriago, Luis Santiago Quiroz-Fernández, Daniella Carla Napoleão, Judite dos Santos Vieira, Nelson Simões Oliveira and Joan Manuel Rodríguez-Díaz
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José Miguel Giler-Molina: Carrera de Ingeniería Ambiental—Escuela Superior Politécnica Agropecuaria de Manabí Manuel Félix López, Calceta 170256, Manabí, Ecuador
Luis Angel Zambrano-Intriago: Laboratorio de Análisis Químicos y Biotecnológicos. Instituto de Investigación. Universidad Técnica de Manabí, Portoviejo 130105, Ecuador
Luis Santiago Quiroz-Fernández: Instituto de Posgrado. Universidad Técnica de Manabí, Portoviejo 130105, Ecuador
Daniella Carla Napoleão: Departamento de Engenharia Química, Universidade Federal de Pernambuco, Recife 50670-901, Brazil
Judite dos Santos Vieira: Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), School of Technology and Management (ESTG), Polytechnic Institute of Leiria, 2411-901 Leiria, Portugal
Nelson Simões Oliveira: Laboratory of Separation and Reaction Engineering-Laboratory of Catalysis and Materials (LSRE-LCM), School of Technology and Management (ESTG), Polytechnic Institute of Leiria, 2411-901 Leiria, Portugal
Joan Manuel Rodríguez-Díaz: Laboratorio de Análisis Químicos y Biotecnológicos. Instituto de Investigación. Universidad Técnica de Manabí, Portoviejo 130105, Ecuador

Sustainability, 2020, vol. 12, issue 21, 1-19

Abstract: Oxytetracycline is one of the antibiotics most frequently used in the Shrimp Industry during the control of bacterial diseases. These emerging pollutants, which appear in low concentrations, are persistent and alternative treatments and are required for their elimination. The degradation of oxytetracycline was evaluated in an aqueous solution by applying homogeneous (UV/H 2 O 2 and photo-Fenton) and heterogeneous (UV/TiO 2 /H 2 O 2 ) advanced oxidative processes (AOPs). The studies were carried out using a bench reactor with short-wave ultraviolet lamps (UV-C). We quantified the extent to which the degradation of the drug had been efficient by employing highly efficient liquid chromatography (HPLC) and a PDA detector with a wavelength of 354 nm and a C18 column. The best results were obtained when applying the UV/H 2 O 2 treatment, which attained a degradation of 97% under the initial conditions of a dose of 8 µL of H 2 O 2 and 120 min of radiation. The pseudo-first order kinetic model proposed by Chan and Chu showed that the experimental results had an adequate fit, with values greater than R 2 ≥ 0.95. Toxicity tests were applied to verify the effect of AOPs employed, when the drug was present in low concentrations. The test results demonstrated a decrease in the root growth of the species Lactuca sativa and Daucus carota .

Keywords: antibiotic; degradation; emerging pollutants; kinetic model; toxicity (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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