Degradation of diclofenac in water using a pulsed corona discharge

作者：Dobrin D; Bradu C; Magureanu M^*; Mandache N B; Parvulescu V I

来源：Chemical Engineering Journal, 2013, 234: 389-396.

DOI：10.1016/j.cej.2013.08.114

• Water treatment
• Non-thermal plasma
• Pulsed corona discharge
• Diclofenac

The oxidative degradation of the pharmaceutical drug diclofenac (DCF) in water was studied using a pulsed corona discharge generated above liquid. It was found that DCF in solution was completely removed after 15 min non-thermal plasma treatment. The mineralization degree of DCF, expressed as the decrease of Total Organic Carbon (TOC), was approximately 50% after 30 min exposure to plasma. A good correlation between the evolution of the Total Carbon and the amount of CO2 released was observed. The elimination of chlorine from DCF occurs rapidly: over 95% is released as Cl- after 15 min non-thermal plasma treatment, indicating the absence of chlorinated degradation products in the treated solution. Several reaction by-products are identified and based on this a tentative degradation pathway of DCF under plasma conditions is proposed.

• 出版日期2013-12