4.6 Article

The effect of pH, nitrate, iron (III) and bicarbonate on photodegradation of oxytetracycline in aqueous solution

Journal

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2018.01.004

Keywords

Oxytetracycline; Photodegradation; pH; Comprehensive effect; Simulated sunlight

Funding

  1. National Natural Science Foundation of China [41276067]
  2. Fundamental Research Funds for the Central Universities of Ocean University of China [201762006, 201762030]

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Photodegradation is a very important elimination pathway of Oxytetracycline (OTC) in aquatic environments. The photochemical behavior of OTC in absence/presence of nitrate, iron (III) and bicarbonate, especially their combinations, was systematically studied in aqueous solution by employing a Suntest-CPS+ sunlight simulator in this work. Meanwhile, the effect of solution pH (4.8-9.1) and irradiation intensity (250-500 W/m(2)) on the removal efficiency of OTC have also been assessed. The results showed that OTC degradation followed a pseudo-first-order kinetics in most conditions except for irradiation in neutral/alkaline solutions and in presence of NO3-, where a two-step pseudo-first-order kinetics was obeyed. OTC degradation was highly pH-dependent and increased significantly with increasing pH. The presence of NO3- and HCO3- promoted the photochemical loss of OTC in aqueous solution by generating hydroxyl radicals and adjusting solution pH, respectively; whereas iron (Ill) was found to play a negative role under the conditions studied. The influence of NO3- coupled with Fe3+ was not a simple additive effect and the overall performance was to inhibit OTC degradation. In addition, combination of HCO3- and NO3- exhibited an antagonistic effect. Results from irradiation in co-presence of NO3-, Fe3+ and HCO3- suggested that direct photolysis of OTC was much more efficient than its indirect photolysis. These results provide a meaningful reference for understanding the fate and transformation of OTC in natural water systems. (C) 2018 Elsevier B.V. All rights reserved.

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