Alternative natural dyes in water purification: Anthocyanin as TiO2-sensitizer in methyl orange photo-degradation

Ultrafast dynamics at the zinc phthalocyanine/zinc oxide nanohybrid interface for efficient solar light harvesting in the near red region

“…The quantum yield (No of contaminant molecules reacted per incident photon) of the methyl orange degradation reaction in the presence of nanohybrid under white and red light irradiation is found to be 7.0 Â 10 À 6 and 4.6 Â 10 À 6 , respectively. The quantum yield values are consistent with the reported literature for methyl orange degradation [31] by dye-sensitized TiO 2 nanoparticles under visible light irradiation through ROS pathway. Our observation is consistent with the enhanced photocatalytic activity of other nanohybrids reported in the literature [18,32,33].…”

Anthocyanin-Sensitized TiO2 Nanoparticles for Phenazopyridine Photodegradation under Solar Simulated Light

“…Despite their advantages, synthetic metal based dyes may readily decompose in the solution under the working conditions. Sensitization by natural dyes is thus the alternative sensitizer in photodegradation of aqueous organic contaminants [25,26].…”

“…Natural dye sensitizers have been commonly reported in solar cell applications, but to a much lesser extent for water purification [28,29]. Very few reports in using natural dye sensitized catalysts are known [25,26,30]. Anthocyanins are stable water-soluble pigments that widely occur in nature.…”

“…here. Different temperatures (15,25,35, and 45 ∘ C) were used for photodegradation of 50 mL phenazopyridine solution (40 ppm) mixed with 0.1 g catalyst. of degradation only slightly increased with increasing the temperature, Table 2.…”

Synthesis of N-TiO2 Effect of the Concentration of Nitrogen in the Band Gap

“…for rutile phase) that prevent the use of the solar light and a low quantic efficiency related to the high recombination rate of photogenerated electrons and holes. With the object to extent the response of TiO 2 at the visible region various technics were developed as for example the introduction of sensitizer like dyes, doping with metals and no metals like S, B, C and N according to Zyoud (2011), Jaimy (2012), Wang (2008), Zaleska (2008), Dolat (2012) and Dong (2009).…”