For comparison, the degradation efficiency of the MB dye by pure PEDOT and nano-ZnO under both light sources as well as the adsorption mechanisms P5091 order of the MB dye by ZnO particles in dark condition and under UV light SB-715992 irradiation without catalysis was also investigated. As depicted in Figures 5 and 6, the decrease of the absorption band intensities of the MB dye indicates that the MB dye can be degraded by PEDOT/ZnO nanocomposites, pure PEDOT, and nano-ZnO under both UV and natural sunlight. Moreover, under UV

light source, the degradation efficiency of MB is 88.7%, 98.7%, and 98.2% for PEDOT/10wt%ZnO, PEDOT/15wt%ZnO, and PEDOT/20wt%ZnO nanocomposites, respectively, and under natural sunlight source, the degradation efficiency of MB is 93.3%, 96.6%, and 95.4% for PEDOT/10wt%ZnO, PEDOT/15wt%ZnO, and PEDOT/20wt%ZnO nanocomposites, respectively. However, in the case of pure PEDOT and nano-ZnO, the degradation efficiencies of the MB dye are 37.7% and 31.3% under UV light for PEDOT and nano-ZnO, respectively, while the degradation efficiencies of the MB dye are 33.9% and 24.3% under natural sunlight for PEDOT and nano-ZnO, respectively. Figure 5 UV-vis absorption spectra of MB dyes by photocatalysis for different irradiation times under UV light irradiation. (a) PEDOT/10wt%ZnO, (b) PEDOT/15wt%ZnO, (c) PEDOT/20wt%ZnO,

(d) pure PEDOT, (e) nano-ZnO, (f) degradation efficiency of the MB dyes (catalyst concentration 0.4 mg/mL, initial concentration SAR302503 chemical structure of dyes 1 × 10-5 M). Figure 6 UV-vis absorption spectra of MB dyes by photocatalysis for different irradiation times under natural sunlight irradiation. (a) PEDOT/10wt%ZnO, (b) PEDOT/15wt%ZnO, (c) PEDOT/20wt%ZnO, (d) PEDOT, (e) nano-ZnO, (f) degradation efficiency of the MB dyes (catalyst concentration 0.4 mg/mL, initial concentration

of dyes 1 × 10-5 M). As shown in Figure 7, the adsorption of the MB dye is 27% under UV light irradiation without catalysis and 17% in dark condition by ZnO particles in 5 h, which suggests that the adsorption of the MB dye under both conditions is Monoiodotyrosine very low. All these results revealed that the degradation efficiencies of pure PEDOT and nano-ZnO are lower than those of PEDOT/ZnO nanocomposites under the same conditions. Furthermore, the photocatalytic activity of the composites decreases with the increasing amount of nano-ZnO. Therefore, it can be concluded that the synergic effects between pure PEDOT and nano-ZnO can play an important role to increase the photocatalytic activity of the composites. It should be noticed that the degradation efficiency of MB by PEDOT/ZnO is higher than that (94% after 6 h) of MB by polyaniline/ZnO nanocomposite [35] and higher than that (88.5% in 10 h) of methyl orange (MG) by poly(3-hexylthiophene)/TiO2 nanocomposites under sunlight irradiation [46]. Figure 7 UV-vis absorption spectra. (a) MB dye without catalysis under UV light irradiation. (b) MB dye by ZnO catalysis under dark condition.