Optimization of Tio2-natural Hydrogels for Paracetamol and Ibuprofen Degradation in Wastewaters.

Abstract

Agarose/micrometer anatase (TiO2) beads were essayed to test the photocatalytic capacity of two of the worldwide most prescribed drugs: paracetamol and ibuprofen. Although the first tests showed good degradation rates for both drugs, the presence of turbidity, due to TiO2 leakage, during the photocatalytic essays induced to improve the stability of the photocatalytic composites. Among the different strategies adopted to strengthen such materials, crosslinking with citric acid and the use of alternative gelling agents: gellan, agargel™ and agar were chosen. Composites obtained merging both strategies were characterized and employed to degrade both drugs under a simulated light that mimics the solar spectrum (indoor). Considering the superior degradation rates obtained when agar and agarose were used to shape the titanium oxide particles, such composites were subjected to a more realistic experiment (outdoor): solar illumination, tap water and higher volumes, that should facilitate its ulterior scale up as a real wastewater depollution procedure.