Ozonation of ibuprofen in presence of SrWO4/ZnO photo-catalyst

Abstract

The study was performed for removing ibuprofen from water using ozonation with visible light SrWO4/ZnO catalyst. For the removal of Ibuprofen, the overall reaction was carried out in a glass reactor in the presence of UV light and constant supply of ozone. The maximum removal efficiency of Ibuprofen was 93% at 0.1 mg/L initial Ibuprofen concentration, and 0.35 g/L catalyst concentration keeping the contact time 30 min. After a certain value, an increase in a concentration of doping agent, catalyst as well as initial Ibuprofen concentration results in a decrease of efficiency of the process. The prepared photo catalysts were characterized by X-ray diffraction, FTIR spectra and SEM analysis. XRD peaks and FTIR spectra has clearly shown that the doping of SrWO4 with ZnO showed better result as compared to individual. SEM analysis showed that they spherical nano-composite crystals were dominant in character. BOD character was found to reduce after ozonation of solution. Various by products were formed and were identified through GC-MS analysis. From results, it was found that combination of SrWO4/ZnO was able to remove 93% of ibuprofen and 0.4% dopping of ZnO on SrWO4 was found to be sufficient. Degradation pattern of by products were identitified in GC-MS with various mass ratios as 177, 92, 57, 44. Nearly 55% removal of BOD was observed in this study. This study was found to be useful for removal of pharmaceuticals and other similar pollutants from water effectively.

Keywords

• Ozonation
• Ibuprofen
• Photo-catalyst
• GC-MS
• BOD
• SrWO4/ZnO