Novel NiTiO3/Ag3VO4 composite with enhanced photocatalytic performance under visible light

Band offsets of novel CoTiO3/Ag3VO4 heterojunction measured by X-ray photoelectron spectroscopy

“…4. The type-II band lineup has previously been reported to reduce the electron-hole recombination rate at the interfaces, thus increasing the photoactivity of the hybrid materials [6,[9][10][11]. In this work, the obtained band alignment corresponds well with our previous PL and photocatalytic studies [7], where a decreased PL intensity and an enhanced photoactivity were found for the CoTiO 3 /Ag 3 VO 4 heterostructure, implying an improved charge separation efficiency.…”

“…Also, if the charging actually exists, both CL and VBM will shift by the same amount and since we are interested only in the position of the CL relative to VBM for the calculation of band offsets, the difference between binding energy values would have a less significant effect on the obtained band offsets [8,[22][23][24]. A small difference in VBM position (0.2 eV) of Ag 3 VO 4 from the one reported previously (1.8 eV) [6] may be ascribed to the differences in various physical factors such as local electronic state, defect and strain, which are known to affect the XPS spectra [13,25,26].…”

“…The heterostructure photocatalysts with suitable matching conduction band (CB) and valence band (VB) potentials can offer the driving force to transfer and separate the electron-hole pairs via close interface, therefore an enhanced photocatalytic activity could be attained due to the abundance of photogenerated charge carriers participating in the photocatalytic process. Several studies have shown that the photoactivity of Ag 3 VO 4 is remarkably improved upon heterojunction formation such as g-C 3 N 4 /Ag 3 VO 4 [4], ZnFe 2 O 4 /Ag 3 VO 4 [5] and NiTiO 3 /Ag 3 VO 4 [6]. Our previous investigation on CoTiO 3 /Ag 3 VO 4 composite [7] also indicated that this heterostructure exhibited notably enhanced photocatalytic activity compared with its corresponding individual materials.…”

Hydrothermal synthesis of FeWO4-graphene composites and their photocatalytic activities under visible light

“…Major strategies for designing visiblelight-driven photocatalysts include the modification of TiO 2 by doping transition-metal cation, and/or doping non-metal, depositing noble metal, and coupling another semiconductor, and so on [2][3][4]. In addition, the development of new visible-light-driven photocatalysts has become an important topic in photocatalysis research, for example, Ag 3 PO 4 [5], BiVO 4 [6], and Ag 3 VO 4 [7] with small band gaps, which offer opportunities for harvesting light energy in the visible region of solar light.…”

Development of novel α-Fe2O3/NiTiO3 heterojunction nanofibers material with enhanced visible-light photocatalytic performance

“…Meanwhile, nickel titanate is reported to be highly stable in oxidizing environment with visible light illumination which is crucial for the photocatalysis application [22,23] a-Fe 2 O 3 nanofibers were synthesized via a facile low temperature hydrothermal route followed by calcination in ambient air atmosphere [24]. A defined quantity of FeCl 3 Á6H 2 O (16 mmol) was dissolved in 112 mL deionised water to form a clear solution.…”