Conference Papers

The photocatalytically-assisted electrochemical degradation of ibuprofen (IBP) in basic medium was carried by using Dimensionally Stable Anodes (DSA) with the composition Ti/RuO2-TiO2 and Ti/RuO2/SnO2-Sb2O5-RuO2, and zeolite-supported TiO2 based on (Z-TiO2- Ag and Z2-TiO2) photocatalysts. Also photoelectrochemical experiments were carried out for assessment of photocatalysts contribution to IBP degradation. The experiments were carried out by applying current densities of 200 and 300 A/m2 simultaneously with UV irradiation for 60, 120 and 180 minutes, and concentration of the photocatalysts of 1 g/L. The degradation processes were monitored by recording the UV spectra and determination of Total Organic Carbon (TOC). The best result for TOC removal efficiency was of 44.27% and it was registered in the photocatalytically-assisted electrochemical degradation of IBP on Ti/RuO2- TiO2 anodes and Z2-TiO2 photocatalyst at 300 A/m2 and 180 min of process duration.

The electrooxidation of anti-inflammatory drug diclofenac (DCF) on Dimensionally Stable Anodes (DSA) and Boron Doped Diamond (BDD) electrode was investigated by cyclic voltammetry. The experiments were carried out in aqueous solutions by using 0.1 M NaSO4 supporting electrolyte. The DSA electrodes were prepared by thermal decomposition of appropriate precursors, while the BDD electrode was commercially produced. The DSA electrodic compositions were Ti/RuO2-TiO2 and Ti/RuO2/SnO2-Sb2O5. The recorded voltammograms showed that DCF direct oxidation did not occur on DSA and the oxidation could occur in the potential range of oxygen evolution. The electrooxidation of DCF on BDD electrode was possible by direct oxidation.

Ibuprofen (IBP) was chosen as a model for non-steroidal anti-inflammatory drugs and its degradation in aqueous solution was carried out by electrochemical oxidation on Dimensionally Stable Anodes (DSA). The DSA had the compositions: Ti/Ru02/SnO2-SbO5-RuO2. The electrolysis were carried in basic medium by using solutions of IBP or IBP and sodium carboxymethyl cellulose (CMC) in 0.1 M Na2SO4 supporting electrolyte. The removal of IBP was assessed by recording UV spectra and total organic carbon (TOC) or chemical oxygen demand (COD) of the electrolysed solutions. The results showed the effectiveness of DSA in IBP degradation in aqueous solutions both in the matrix that contains only IBP and those containing also CMC.

The removal of the non-steroidal anti-inflammatory drug diclofenac (DCF) was carried out by electrooxidation on Dimensionally Stable Anodes (DSA) with the composition Ti/RuO2-TiO2. The DSA electrodes were obtained by thermal decomposition of the appropriate precursors. The electrolyses were carried by using solutions of 100 mg/L DCF in 0.1 M Na2SO4 supporting electrolyte in acidic medium at various current densities and electrolysis times. The removal of DCF was assessed by recording UV-VIS spectra and chemical oxygen demand (COD) determination of the electrolysed solutions. The results showed the mineralization of the DCF during the electrooxidation on Ti/Ru0.3Ti0.7O2 electrodes.