Fabrication of 3 D Mesoporous Black TiO₂/MoS₂/TiO₂ Nanosheets for Visible‐Light‐Driven Photocatalysis

Abstract

A novel 3 D mesoporous black TiO2 (MBT)/MoS2 /MBT sandwich-like nanosheet was successfully fabricated using a facile mechanochemical process combined with an in situ solid-state chemical reduction approach, followed by mild calcination (350 °C) under an argon atmosphere. The MBT/MoS2 /MBT exhibits a 3 D sandwich-like nanosheet structure and heterojunctions are formed at the interfaces between MoS2 and black TiO2 . The significantly narrowed band gap of MBT/MoS2 /MBT is attributed to the introduction of MoS2 and the formed Ti(3+) species in the frameworks. The visible-light photocatalytic degradation rate of methyl orange and the hydrogen production rate are as high as 89.86 % and 0.56 mmol h(-1) g(-1) , respectively. The introduction of MoS2 and Ti(3+) in the frameworks favors the visible-light absorption and the separation of photogenerated charges, and the 3 D sandwich-like heterojunction structure facilitates the transfer of photogenerated charges.

Facile synthesis of MoS 2 QDs/TiO 2 nanosheets via a self‐assembly strategy for enhanced photocatalytic hydrogen production

“…Figure 3A, B displays the high resolution XPS spectra for Ti 2p and O 1s, respectively. The binding energy of Ti 2p and O 1s has slight shift in comparison to nude TiO 2 nanosheets, which may be due to the formation of Ti‐O‐Mo bond . Accordingly, Mo 3d and S 2p XPS spectra of MoS 2 QDs/TiO 2 can be obtained, as indicated in Figure 3C, D.…”

Black TiO2 nanobelts/g-C3N4 nanosheets Laminated Heterojunctions with Efficient Visible-Light-Driven Photocatalytic Performance

“…As shown in Fig. 10, the Ti 3+ and oxygen vacancies are detected at the bottom of the TiO 2 conduction band (CB), which can be easily narrow the bandgap of TiO 2 nanobelt and improve the optical absorption properties12. When the catalyst is exposed to visible-light irradiation, g-C 3 N 4 can produce photo-induced electron-hole pairs.…”

“…Nevertheless, the wide band-gap (about 3.2 eV for anatase) and the rapid recombination of photoinduced electron-holes are major drawbacks in its poor photocatalytic activity9. To date, various methods were developed to improve the visible light absorption of TiO 2 , including metal and non-metal elements doping10, surface sensitization11, semiconductor heterojunction12, and so on. Among them, semiconductor coupling is an efficient method to reduce the recombination of photoinduced electron-hole pairs.…”

Black Titanium Dioxide Nanomaterials in Photocatalysis

“…3D mesoporous black TiO 2 /MoS 2 / TiO 2 (MBT/MoS 2 /MBT) nanosheets were prepared by ball milling and subsequent NaBH 4 reduction at 350°C for 1 h under an Ar atmosphere as shown schematically in Figure 9 [85]. The introduction of the TiO 2 -MoS 2 heterojunction and the Ti 3+ species narrowed the band gap of TiO 2 , leading to the excellent activity in photocatalytic degradation of methyl orange and water splitting for H 2 evolution under visible-light irradiation [85]. The H 2 production rates were 0, 0.13, 0.32, and 0.56 mmol·h [86,87].…”