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 (NO3â) and titanium dioxide (TiO2) on DCF photodegradation was investigated. The experimental activity was carried out in a batch reactor of 100Â mL equipped with fixed UV light of 254Â nm and an irradiation intensity of 400Â mJ/m2. Diclofenac initial concentration was equal to 10Â mg/L in pure water, and its removal was evaluated by varying HA concentration in the range 10â20Â mg/L and NO3â concentration in the range 25â50Â mg/L. Furthermore, the heterogeneous catalysis with TiO2 (1â50Â mg/L) was studied. Temperature in all experiments was kept constant at 20Â Â°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.
|Titolo:||Photodegradation of Diclofenac Sodium Salt in Water Solution: Effect of HA, NO3â and TiO2 on Photolysis Performance|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|