Photodegradation of bisphenol A polycarbonate

Effect of Weathering and Accelerated Photoaging on PET/PC (80/20 wt/wt%) Melt Extruded Blend

“…Figure 1 shows the WAXD patterns of the neat polymers and the PET/PC blend, after different types of aging. The diffraction angles (2 θ) of PET at 17, 23 and 27° are ascribed to the crystallographic planes HKL (010), (110), (100), respectively 6,13,14 . The WAXD pattern of the PC resembled an amorphous material.…”

“…The T max of the PC phase did not show significant changes regardless of exposure time and type of aging. According to Diepens et al 14,18 , PC is degraded by photodegradation and the deterioration initiates with heterolytic scission of the carbonate bond (forming primary free radicals), producing structures like aromatic hydrocarbons, ether and aromatic alcohol of low molar mass. In this work, the integrity of the PC was related to the protection by the PET matrix.…”

Optimized photodegradation of Bisphenol A in water using ZnO, TiO<sub>2</sub> and SnO<sub>2</sub> photocatalysts under UV radiation as a decontamination procedure

“…Photo-Fries is a complex reaction that occurs as a combined or independent process and plays the most important role during the outdoor weathering processes of polycarbonate (Pickett, 2011). The exposure of BPA with short wavelengths leads to substantial rearrangement of the aromatic carbonate into phenylsalicylate and dihydroxybenzophenone derivatives (Diepens and Gijsman, 2007). Rivaton et al (1983) proved that photo-Fries rearrangement reactions are more likely to occur when short UV wavelength are used (< 300 nm).…”

“…In contrast, advanced degradation (e.g., photo-oxidation) reactions have a high efficiency when wavelengths > 340 nm are used (Rivaton et al, 1983). However, BPA exhibits absorption of UV wavelength exceeding 290 nm in neutral and acidic methanol solutions (Diepens and Gijsman, 2007;Howard, 1991b). Metal oxides have been widely used as catalysts for photodegradation in recent years and can be used for the successful treatment of water and total oxidation of organic pollutants considering the type and magnitude of contamination (Ferrandon, 2001;Ibhadon and Fitzpatrick, 2013;Jackson and Hargreaves, 2009;Patel and Pathan, 2015;Pelizzetti et al, 1993).…”

Photo Degradation of Cotnaminants of Emerging concern (CECs) under Simulated Solar Radiation: Implications for their Environmental Fate

“…The wavelength distribution and the intensity of the Xenon lamp are very similar to that of natural sunlight (Diepens and Gijsman, 2007). Compared with the spectrum of real sunlight measured on a sunny day at Miami, FL, the light distribution of SunTest xenon lamp matched sunlight very well, especially in the most relevant 300 nm-400 nm range.…”