TY - JOUR
T1 - Engineering Z-system hybrids of 0D/2D F-TiO2quantum dots/g-C3N4heterostructures through chemical bonds with enhanced visible-light photocatalytic performance
AU - Wang, Jian
AU - Lin, Wei
AU - Hu, Hao
AU - Liu, Chunxia
AU - Cai, Qiong
AU - Zhou, Shijian
AU - Kong, Yan
N1 - Publisher Copyright:
© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021.
PY - 2021/2/14
Y1 - 2021/2/14
N2 - Constructing a direct Z-scheme system for photocatalysts is a promising strategy to enhance photocatalytic redox performance owing to its effective charge transfer; however, building a reasonable interfacial charge transfer bridge for charge selective recombination is still a challenge. Herein, a F-doped TiO2quantum dot/g-C3N4nanosheet Z-scheme photocatalyst is synthesizedviaa facile method of fluorine-containing solvothermal treatment. In this Z-scheme structure, F-TiO2quantum dots (QDs, 3-7 nm) are bridged with g-C3N4nanosheets through C-O covalent bonds. Thus, the oxidizability and reducibility of the composite photocatalyst and the interfacial charge transfer ability are greatly improved. Meanwhile, the TiO2quantum dots provide more active sites and enhance the light harvesting, which are both beneficial for the photocatalytic reaction process. In this designed catalyst, the C-O covalent bond, as a chemical group bridge, provides an effective pathway for charge transfer and selective recombination, which greatly enhances the utilization of photogenerated electrons and holes. As a result, the FT/CNS-1-2 photocatalyst shows the highest photocatalytic activity for photocatalytic rhodamine B (RhB) decomposition, Cr(vi) reduction and phenol decomposition under visible light irradiation, which are about 17.1/4, 16/5.3 and 23.5/4.4 times higher than those of pure F-TiO2/g-C3N4, respectively. The excellent photocatalytic activity is mainly ascribed to the Z-scheme charge transfer model, which greatly enhanced the separation and transfer of charge carriers. In addition, the trapping experiments found that ˙O2−and ˙OH are the dominant active species in the photocatalytic process. This study of the chemically bonded Z-scheme F-TiO2/g-C3N4photocatalyst provides ideas for the fabrication of such TiO2QD based materials and a Z-scheme system for effective change transfer in photocatalysis processes.
AB - Constructing a direct Z-scheme system for photocatalysts is a promising strategy to enhance photocatalytic redox performance owing to its effective charge transfer; however, building a reasonable interfacial charge transfer bridge for charge selective recombination is still a challenge. Herein, a F-doped TiO2quantum dot/g-C3N4nanosheet Z-scheme photocatalyst is synthesizedviaa facile method of fluorine-containing solvothermal treatment. In this Z-scheme structure, F-TiO2quantum dots (QDs, 3-7 nm) are bridged with g-C3N4nanosheets through C-O covalent bonds. Thus, the oxidizability and reducibility of the composite photocatalyst and the interfacial charge transfer ability are greatly improved. Meanwhile, the TiO2quantum dots provide more active sites and enhance the light harvesting, which are both beneficial for the photocatalytic reaction process. In this designed catalyst, the C-O covalent bond, as a chemical group bridge, provides an effective pathway for charge transfer and selective recombination, which greatly enhances the utilization of photogenerated electrons and holes. As a result, the FT/CNS-1-2 photocatalyst shows the highest photocatalytic activity for photocatalytic rhodamine B (RhB) decomposition, Cr(vi) reduction and phenol decomposition under visible light irradiation, which are about 17.1/4, 16/5.3 and 23.5/4.4 times higher than those of pure F-TiO2/g-C3N4, respectively. The excellent photocatalytic activity is mainly ascribed to the Z-scheme charge transfer model, which greatly enhanced the separation and transfer of charge carriers. In addition, the trapping experiments found that ˙O2−and ˙OH are the dominant active species in the photocatalytic process. This study of the chemically bonded Z-scheme F-TiO2/g-C3N4photocatalyst provides ideas for the fabrication of such TiO2QD based materials and a Z-scheme system for effective change transfer in photocatalysis processes.
UR - http://www.scopus.com/inward/record.url?scp=85100871230&partnerID=8YFLogxK
U2 - 10.1039/d0nj05500j
DO - 10.1039/d0nj05500j
M3 - 文章
AN - SCOPUS:85100871230
SN - 1144-0546
VL - 45
SP - 3067
EP - 3078
JO - New Journal of Chemistry
JF - New Journal of Chemistry
IS - 6
ER -