01735naa a2200253 a 450000100080000000500110000800800410001902200140006002400600007410000200013424501050015426000090025952009720026865300250124065300230126565300150128865300190130370000180132270000220134070000160136270000230137870000220140177300580142321315132022-06-10       2021    bl uuuu     u00u1 u    #d  a0025-54087 ahttps://doi.org/10.1016/j.materresbull.2020.1110732DOI1 aOLIVEIRA, J. A.  aPhotocatalytic CO2 reduction over Nb2O5/basic bismuth nitrate nanocomposites.h[electronic resource]  c2021  aIn this work, CO2 was photocatalytic converted to valuable chemicals using photoactive basic bismuth nitrates (Bi6O(4+x)(OH)(4-x)(NO3)(6-x)).nH2O, x = 0–2, n = 0–3) and niobium pentoxide nanocomposites (BBN/Nb2O5). Milder hydrothermal synthesis (at 120 ◦C) maintained the crystal lattice of the BBN precursor (Bi6O5(OH)3(NO3)5.3H2O), while the synthesis carried out at 230 ◦C led to lamellar Bi2O2(OH)(NO3). Despite of the sample treated at 230 ◦C did not present the required band edge positions to reduce CO2, all the other materials were active for CO2 photoreduction. CO (~2.8 μmol g− 1 h− 1 ) was identified as the main product, followed by C2H4 (~0.1 μmol g− 1 h− 1 ), with the latter being favored using the nanocomposite produced at 120 ◦C. Scavenger experiments revealed that the photocatalytic mechanism is based on a Z-scheme, where molecules are oxidized in the valence band of Nb2O5 and CO2 is reduced in the conduction band of BBN.  aCatalytic properties  aChemical synthesis  aComposites  aNanostructures1 aTORRES, J. A.1 aGONÇALVES, R. V.1 aRIBEIRO, C.1 aNOGUEIRA, F. G. E.1 aRUOTOLO, L. A. M.  tMaterials Research Bulletingv. 133, a. 111073, 2021.