Direct Z‐scheme N‐doped TiO₂/MoS₂ Heterojunction Photocatalyst for Photodegradation of Methylene Blue under Simulated Sunlight

Abstract

The N‐doped TiO2/MoS2 heterojunction with direct Z‐scheme was prepared by growing MoS2 flowers on the surface of N‐doped TiO2 (N‐TiO2) spheres. The results show that the N‐TiO2 sphere is composed of nanoparticles with the diameter of about 10 nm. The MoS2 flowers with the diameter of 500 nm could grow homogeneously on the surface of N‐TiO2 spheres, and the latter could prevent the accumulation of MoS2 nanopetals. The N‐TiO2/MoS2 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‐TiO2/MoS2 can reach 97.9 % under simulated sunlight, which is much higher than those of TiO2, MoS2 and N‐TiO2. Moreover, the N‐TiO2/MoS2 heterojunction shows a good stability and the degradation rate of MB keeps up to 85.9 % after being subjected to five cycles.

Direct Photocatalytic Methane Oxidation to Formaldehyde by N Doping Co-Decorated Mixed Crystal TiO2

“…According to previous studies, the N 2p orbitals can produce an impurity level above the valence band of TiO 2 by hybridization with O 2p. 50,51 Therefore, the narrower band gap and higher adsorption in the UV-light range of 0.28% N-TiO 2 (A 0.75 /R 0.25 ) confirm that doping of N in the TiO 2 lattice is an effective strategy to significantly improve the light utilization efficiency. Based on the Mott−Schottky curve of the 0.28% N-TiO 2 (A 0.75 /R 0.25 ) measured at different frequencies [Figure S11a], the conduction band and valence band potentials of 0.28% N-TiO 2 (A 0.75 /R 0.25 ) are calculated and determined to be −0.83 and 2.02 V vs NHE, respectively.…”

Unveiling the antibacterial strategies and mechanisms of MoS2: a comprehensive analysis and future directions

“…Additionally, a direct N-doped TiO 2 /MoS 2 Z-scheme heterojunction was constructed through the growth of MoS 2 flowers on the surface of N-doped TiO 2 (N-TiO 2 ) spheres. The degradation rate of MB by N-TiO 2 /MoS 2 under simulated sunlight was found to be 97.9%, which is significantly higher than that of TiO 2 , MoS 2 , and N-TiO 2 , 139 as depicted in Fig. 8(b).…”

Interaction Mechanisms and Application of Ozone Micro/Nanobubbles and Nanoparticles: A Review and Perspective

“…(1) Nonmetallic doping modification. Nonmetallic materials are widely available and inexpensive, and nonmetallic ions are doped into the lattice of TiO 2 to replace the oxygen vacancies of TiO 2 [52], which can not only reduce the band gap of TiO 2 nanoparticles and broaden the visible light response range [53][54][55], but also effectively inhibit the recombination of photocarriers [56] and improve their photocatalytic performance.…”