Photocatalytic activity of ZnO doped with Ag on the degradation of endocrine disrupting under UV irradiation and the investigation of its antibacterial activity

Band gap-engineered ZnO and Ag/ZnO by ball-milling method and their photocatalytic and Fenton-like photocatalytic activities

“…For the reference ZnO, a major peak was observed at 438 cm -1 , which was assigned to the E 2 (high) mode. Smaller peaks were also observed at 332, 383 and ~580 cm -1 , which were assigned to the E 2H -E 2L , A 1 (TO) and M a n u s c r i p t 10 A 1 &E 1 (LO) modes, respectively [29,35,44]. For the ball-milled samples, the E 2 (high) mode at 438 cm -1 decreased drastically.…”

Application of graphene quantum dots as green homogenous nanophotocatalyst in the visible-light-driven photolytic process

“…Therefore, hole hydroxyl radicals are generated (Eqs. (6) and (7)) when adsorbed/or chemisorbed hydroxyl anion or water molecules oxidize with the valence-band [51]. In this regard, the valence band holes could directly oxidize organic pollutants (i.e., the Celestine Blue dye) adsorbed on the surface of the catalyst (GQDs), or indirectly mineralize them through hydroxyl radicals·) OH) generated by the reaction of the holes and water molecules (H 2 O) or chemisorbed (OH − ), [52].…”

“…Where, (e − CB ) and (h + VB ) are the electrons in the conduction-band and the electron vacancy in the valence-band, respectively. Both (e − CB ) and (h + VB ) can migrate to the photocatalyst (GQDs) surface, where they can participate in a redox reaction with other species on the surface photocatalyst [51]. Then, the molecular oxygen (O 2 ) near the interface of the photocatalyst could be quickly reduced to the superoxide anion radical (O 2 −⋅ (Eq.…”

Synthesis and Characterization of ZnO-Ag Nanoparticles Supported on MCM-41 as Photocatalyst

“…Hence, there are sites available accommodating higher doping concentration limits in the host lattice 6 . The presence of Ag improves its photocatalytic properties 7,8 , by promoting interfacial electron-hole spacing 9 and the Ag addition may trap photogenerated electrons 10 .…”