Photocatalytic degradation of methylene blue dye using poly(3-hydroxybutyrate)/poly(ethylene glycol)/titanite films and membranes

In this work, novel poly(3-hydroxybutyrate) (PHB)/poly(ethylene glycol) (PEG)/titanite (CaTiSiO5) composites in the form of films and membranes are used for the photocatalytic degradation of methylene blue (MB) in aqueous solution. Films and membranes are prepared from PHB and PEG with either 80 or 93 mol% of titanite. For comparison purposes, titanite powder, films, and membranes of PHB and PEG with no titanite added, are also analyzed. To study the behavior of the materials, X-ray diffraction, luminescence, field emission scanning electron microscopy, and Raman spectroscopy, are used. Additionally, contact angle was measured by the sessile drop technique. Materials are placed in a beaker containing the MB aqueous solution under constant stirring and exposed to UV light for 12 h. With respect to the initial concentration (C-0), the relative MB concentration (C/C-0) is measured every hour employing UV-visible spectroscopy. The obtained results showed that by using 0.010 g of titanite powder, approximately 30% of the MB is degraded after 12 h of UV irradiation. The highest MB degradation is obtained with 0.320 g of the polymer/ceramic membrane (0.310 g of polymers and 0.010 g of titanite), where approximately 90% of MB is degraded.

Automated summary

Novel PHB/PEG/titanite composites in the form of films and membranes were studied for the photocatalytic degradation of methylene blue. Results showed that approximately 30% of MB was degraded after 12 h of UV irradiation with 0.010g of titanium powder, while around 90% of MB was degraded with 0.320g polymer/ceramic membrane (0.310g polymers and 0.010g titanite).