当前位置: X-MOL 学术Mater. Res. Bull. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Photocatalytic CO2 reduction over Nb2O5/basic bismuth nitrate nanocomposites
Materials Research Bulletin ( IF 5.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.materresbull.2020.111073
Jéssica A. Oliveira , Juliana A. Torres , Renato V. Gonçalves , Caue Ribeiro , Francisco G.E. Nogueira , Luís A.M. Ruotolo

Abstract In 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.

中文翻译:

Nb2O5/碱性硝酸铋纳米复合材料上的光催化 CO2 还原

摘要 在这项工作中,使用光活性碱性硝酸铋 (Bi6O(4+x)(OH)(4-x)(NO3)(6-x)).nH2O,x = 0-2,将 CO2 光催化转化为有价值的化学品, n = 0-3) 和五氧化二铌纳米复合材料 (BBN/Nb2O5)。温和的水热合成(在 120 °C 下)保持了 BBN 前体(Bi6O5(OH)3(NO3)5.3H2O)的晶格,而在 230 °C 下进行的合成导致了层状 Bi2O2(OH)(NO3)。尽管在 230 °C 下处理的样品没有出现还原 CO2 所需的带边缘位置,但所有其他材料都对 CO2 光还原具有活性。CO(~2.8 μmol g-1 h-1)被确定为主要产物,其次是 C2H4(~0.1 μmol g-1 h-1),后者使用在 120 °C 下生产的纳米复合材料更受欢迎。清道夫实验表明,光催化机理是基于Z-scheme,
更新日期:2021-01-01
down
wechat
bug