Reversible photoreduction of methylene blue in acrylate media containing benzyl dimethyl ketal

Visible light driven degradation of methylene blue dye using Ag3PO4

“…As the optical absorption of Ag 3 PO 4 (2.35 & 2.41 eV) lies in the visible light region, it has the superior ability to absorb visible light radiation and degrade the dye efficiently. The target pollutant MB is an N-containing, hetero-aromatic, cationic thiazine green colour organic dye [42] with chemical formula C 16 H 18 ClN 3 S. The green colour powder yields blue colour solution in water used as colouring agent in variety of industries [43].…”

Photocatalytic colour switching of redox dyes for ink-free light-printable rewritable paper

“…They may serve as promising imaging media for the development of rewritable paper if their redox reactions can be manipulated properly. Methylene blue (MB), for example, can be switched between blue colour in an oxidizing environment and colourless (leuco form, LMB) in a reducing environment [26][27][28] . It is a dye of low toxicity broadly used in biology and medicine, with typical applications include being an antidote for cyanide and, most commonly, in vitro diagnostic in biology, cytology, haematology and histology [29][30][31] .…”

“…It is a dye of low toxicity broadly used in biology and medicine, with typical applications include being an antidote for cyanide and, most commonly, in vitro diagnostic in biology, cytology, haematology and histology [29][30][31] . It has been found that TiO 2 , a photocatalytically active material, could be used to enable the decolouration of MB under UV irradiation [26][27][28] . In this case, additional reducing agents, such as ascorbic acid, were usually used as sacrificial electron donor (SED) to scavenge the holes produced from the excitation of TiO 2 under UV irradiation, and leave photo-generated electrons for reducing MB to LMB in solution.…”

Synthesis and Characterization of TiO2/Au Nanocomposite Using UV-Irradiation Method and Its Photocatalytic Activity to Degradation of Methylene Blue

“…When the time of irradiation increased, the concentration of methylene blue decreased as shown in Fig. 7 due to the subsequent proton producing reactions, the formation of NO3 -and SO4 2-ions is shown in the reaction [33]:…”