Photocatalytic degradation of methyl orange using Bi2MNbO7 (M=Al, Fe, Ga, In) semiconductor films on stainless steel

Photoelectrochemical Hydrogen Production from Aqueous Solution Containing Cyanide Using Bi2MNbO7 (M = Al, Fe, Ga, In) Films on Stainless Steel as Photoanodes

“…At the same electrolyte conditions and 1 h of the photoelectrochemical process the photoanodes exhibited the following performance: Bi 2 AlNbO 7 /304 SS ) Bi 2 InNbO 7 / 304 SS & Bi 2 FeNbO 7 /304 SS [ Bi 2 GaNbO 7 /304 SS & TiO 2 /304 SS [ 304 SS. These results can not be straightforward correlated with their band-gap values, degree of crystallinity or stoichiometric ratios as in the previous reports on photocatalytic degradation [59,60]. Electrical and photoelectrical transport properties seem to play a preponderant role on these photoelectrochemical systems [54,61].…”

“…This new series of promising photocatalysts for water decomposition with visible light was first synthesized as powders, by a solidstate reaction [53][54][55][56][57] and a sol-gel process [58], and recently as thin films, by sol-gel dip-coating [59][60][61].…”

Synthesis of Bi–Fe–Sb–O Pyrochlore Nanoparticles with Visible‐Light Photocatalytic Activity

“…To avoid bismuth reduction, several samples were synthesized with the amount of bismuth halved. The reactions under such conditions yielded not only metallic bismuth but also NaSb(OH) 6 ( Figure S1). Clearly, this can be attributed to the partial dissolution of antimony in the alkaline solution, whereas the bismuth and iron nitrates remain as weakly reacting oxides.…”

“…The concentration of this component decreased slightly as the alkalinity of the solution increased. A further alkalinity increase to a 16 M NaOH solution resulted in the formation of a Bi 25 FeO 40 + Bi + FeO(OH) + NaSb(OH) 6 mixture. The absence of the pyrochlore in the products can be attributed to the solubility of antimony compounds at such high alkali concentration.…”

“…[1] The high photoactivities of oxides with the pyrochlore structure have been reported previously. [2][3][4][5][6] Photocatalytic water decomposition was observed in the presence the Bi-containing compounds Bi 2 MTaO 7 (M = In, Ga, Fe, Y, La) [2,3] and Bi 2 MNbO 7 [M = Al, Ga, In, Y, rare-earth element (REE)]; [4,5] in turn, Bi 2 MNbO 7 (M = Al, Ga, In, Fe) [6,7] and Bi 2 MTaO 7 (M = Y, La) [3] can be used for the photodecomposition of organic dyes. The photoactivities of the Bi 2 MSbO 7 compounds have not been studied previously, although Y 2 FeSbO 7 and In 2 FeSbO 7 can be used as photocatalysts for rhodamine B degradation.…”