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Direct Z‐scheme N‐doped TiO 2 /MoS 2 Heterojunction Photocatalyst for Photodegradation of Methylene Blue under Simulated Sunlight
Author(s) -
Li Songjie,
Li Yuanyuan,
Shao Lixiang,
Wang Chengduo
Publication year - 2021
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202004337
Subject(s) - heterojunction , photodegradation , materials science , degradation (telecommunications) , photocatalysis , doping , methylene blue , band gap , chemical engineering , nanotechnology , optoelectronics , nuclear chemistry , chemistry , catalysis , telecommunications , organic chemistry , engineering , computer science
The N‐doped TiO 2 /MoS 2 heterojunction with direct Z‐scheme was prepared by growing MoS 2 flowers on the surface of N‐doped TiO 2 (N‐TiO 2 ) spheres. The results show that the N‐TiO 2 sphere is composed of nanoparticles with the diameter of about 10 nm. The MoS 2 flowers with the diameter of 500 nm could grow homogeneously on the surface of N‐TiO 2 spheres, and the latter could prevent the accumulation of MoS 2 nanopetals. The N‐TiO 2 /MoS 2 heterojunction has a narrow band gap of 2.05 eV and high activity for degrading methylene blue (MB). The degradation rate of MB by N‐TiO 2 /MoS 2 can reach 97.9 % under simulated sunlight, which is much higher than those of TiO 2 , MoS 2 and N‐TiO 2 . Moreover, the N‐TiO 2 /MoS 2 heterojunction shows a good stability and the degradation rate of MB keeps up to 85.9 % after being subjected to five cycles.