Preparation and enhanced visible-light photocatalytic activity of graphitic carbon nitride/bismuth niobate heterojunctions.
A series of graphitic carbon nitride/bismuth niobate (g-C3N4/Bi5Nb3O15) heterojunctions with g-C3N4 doping level of 10-90 wt% were prepared by a facile milling-heat treatment method. The phase and chemical structures, surface compositions, electronic and optical properties as well as morphologies of the prepared g-C3N4/Bi5Nb3O15 were well-characterized. Subsequently, the photocatalytic activity and stability of g-C3N4/Bi5Nb3O15 were evaluated by the degradation of aqueous methyl orange (MO) and 4-chlorophenol (4-CP) under the visible-light irradiation. At suitable g-C3N4 doping levels, g-C3N4/Bi5Nb3O15 exhibited enhanced visible-light photocatalytic activity compared with pure g-C3N4 or Bi5Nb3O15. This excellent photocatalytic activity was revealed in terms of the extension of visible-light response and efficient separation and transportation of the photogenerated electrons and holes due to coupling of g-C3N4 and Bi5Nb3O15. Additionally, the active species yielded in the pure g-C3N4- and g-C3N4/Bi5Nb3O15-catalyzed 4-CP photodegradation systems were investigated by the free radical and hole scavenging experiments.
School of Chemistry, Northeast Normal University, Changchun 130024, PR China; Analytical and Testing Center, Beihua University, Jilin 132013, PR China.
Shengqu
S
Zhang
Yuxin
Y
Yang
Yingna
Y
Guo
Wan
W
Guo
Mei
M
Wang
Yihang
Y
Guo
Mingxin
M
Huo
D001391:Azo Compounds / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry* / Q000528:radiation effects; D002384:Catalysis; D002733:Chlorophenols / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry; D006108:Graphite / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D009556:Niobium / Q000737:chemistry* / Q000528:radiation effects; D009570:Nitriles / Q000737:chemistry* / Q000528:radiation effects; D055668:Photochemical Processes; D014874:Water Pollutants, Chemical / Q000737:chemistry*
D001391:Azo Compounds; D002733:Chlorophenols; D004396:Coloring Agents; D009570:Nitriles; D014874:Water Pollutants, Chemical; D009556:Niobium; C029107:4-chlorophenol; C011206:cyanogen; C100258:methyl orange; D006108:Graphite; D001729:Bismuth
Bismuth niobate; Graphitic carbon nitride; Heterojunction; Organic pollutant; Visible-light photocatalysis