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Photodegradation of Diclofenac Sodium Salt in Water Solution: Effect of HA, NO3 − and TiO2 on Photolysis Performance

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Abstract

Diclofenac (hereafter DCF) is an extensively used anti-inflammatory drug; therefore, it is found in many sewage treatment plant effluents and it is one of the most usually reported environmental pharmaceutical contaminants. In this work, the degradation of diclofenac in pure water under UV light was studied, and the influence of some variables, such as humic acids (HA), nitrate anions (NO3 −) and titanium dioxide (TiO2) on DCF photodegradation was investigated. The experimental activity was carried out in a batch reactor of 100 mL equipped with fixed UV light of 254 nm and an irradiation intensity of 400 mJ/m2. Diclofenac initial concentration was equal to 10 mg/L in pure water, and its removal was evaluated by varying HA concentration in the range 10–20 mg/L and NO3 − concentration in the range 25–50 mg/L. Furthermore, the heterogeneous catalysis with TiO2 (1–50 mg/L) was studied. Temperature in all experiments was kept constant at 20 °C. Experimental results show that while HA have a significant influence on DCF photodegradation, nitrate and titanium dioxide seem to be ineffective, at least in the tested conditions. Finally, DCF photolysis modelling was carried out and a pseudo-first-order kinetic model was used.

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Authors and Affiliations

  1. Dipartimento di Ingegneria Civile, Design, Edilizia e Ambiente, Università degli Studi della Campania “L. Vanvitelli”, Real Casa dell’Annunziata, Via Roma 9, 81031, Aversa (CE), Italy

    Simeone Chianese & Dino Musmarra

  2. Dipartimento di Scienze e Tecnologie Ambientali, Biologiche e Farmaceutiche, Università degli Studi della Campania “L. Vanvitelli”, Via Vivaldi 43, 81100, Caserta, Italy

    Pasquale Iovino & Vincenzo Leone

  3. Dipartimento di Ingegneria Industriale e dell’Informazione e di Economia, Università dell’Aquila, viale Giovanni Gronchi 18, 67100, L’Aquila, Italy

    Marina Prisciandaro

Authors
  1. Simeone Chianese
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  2. Pasquale Iovino
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  3. Vincenzo Leone
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  4. Dino Musmarra
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  5. Marina Prisciandaro
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Correspondence to Marina Prisciandaro.

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Chianese, S., Iovino, P., Leone, V. et al. Photodegradation of Diclofenac Sodium Salt in Water Solution: Effect of HA, NO3 − and TiO2 on Photolysis Performance. Water Air Soil Pollut 228, 270 (2017). https://doi.org/10.1007/s11270-017-3445-y

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  • DOI: https://doi.org/10.1007/s11270-017-3445-y

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