“…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.…”