Anthraquinone-2,7-disulfonic acid disodium salt is an anthraquinone sulfonate used in AORFBs and in self-cleaning nanofiber membranes. Anthraquinone-2,7-disulfonic acid disodium salt has potential as an aqueous organic redox flow battery (AORFB), where the 2,7-AQDS and potassium iodide are the negative and positive ends, respectively. Anthraquinone-2,7-disulfonic Acid Disodium Salt is used with hydrophilic poly(vinyl alc.-co-ethylene) (PVA-co-PE) nanofiber composite membranes to create photoinduced self-cleaning nanofiber membranes. Anthraquinone-2,7-disulfonic acid disodium salt is also known as 2,7-AQDS, 9,10-Dihydro-9,10-dioxo-2,7-anthracenedisulfonic Acid Disodium Salt, Disodium 9,10-Anthraquinone-2,7-disulfonate; Disodium Anthraquinone-2,7-disulfonate, Sodium Anthraquinone-2,7-disulfonate, and 9,10-Dioxo-9,10-dihydroanthracene-2,7-disulfonic Acid Disodium Salt.