A Visible‐Light‐Driven Photocatalyst of NASICON Li₂Ni₂(MoO₄)₃ Nanoparticles

Abstract

A visible-light-driven photocatalyst based on the well-known cathode material of NASICON-type Li 2 Ni 2 (MoO 4 ) 3 was prepared by a modified Pechini method. The sample was characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, and UV-vis absorption spectrum. The average size of Li 2 Ni 2 (MoO 4 ) 3 particle is below 50 nm. NASICON nanoparticles Li 2 Ni 2 (MoO 4 ) 3 has an efficient absorption in the UV-visible light wavelength region with a direct allowed electronic transition of 2.07 eV. The photocatalytic properties of Li 2 Ni 2 (MoO 4 ) 3 were evaluated by the photodegradation of methylene blue (MB). Li 2 Ni 2 (MoO 4 ) 3 has an efficient photocatalytic activity and could be a potential photocatalyst driven by visible-light. The photocatalytic activity was discussed on the optical absorption and special hexagonal tunnel structure connected by optical active centers of MoO 4 and NiO 6 and its good conductivity.

On Structure, Optical Properties and Photodegradated Ability of Aurivillius‐Type Bi3TiNbO9 Nanoparticles

“…And the new band appearing in the near IR region is the typical spin allowed d – d transition in Ni 2+ with an octahedral environments of 3 A 2g (F)→ 3 T 1g (P) . The similar results were reported in some photocatalysts with Ni‐contents such as CsLaSrNb 2 NiO 9 and Li 2 Ni 2 (MoO 4 ) 3 . This absorption can be understood by the schematic diagraph in Fig.…”

Unique Colours of 3d‐Transition‐Metal‐Substituted Lyonsite Molybdates and Their Derivatives: The Role of Multiple Coordination Geometries and Metal‐to‐Metal Charge Transfer

“…These absorption bands leave a window of almost no absorption in the yellow‐green region of the visible spectra and a shallow valley of weak absorption in the violet region, which results in the yellow colours of the compounds. We assigned the peaks in the optical absorption spectra of Li 3– x Al 1– x Ni II 2 x (MoO 4 ) 3 ( x = 0.25, 0.5, 1.0; Table ) on the basis of the spectra of Li 2 Ni 2 (MoO 4 ) 3 , Zn 2– x Ni II x Te 3 O 8 , BaNiTi 7 O 16 and NiWO 4 . The bands with maxima at around 1.51 and 2.76 eV have been assigned to octahedral ligand‐field transitions 3 A 2 (F) → 3 T 1 (F) and 3 A 2 (F) → 3 T 1 (P), respectively.…”

Insight Into Malachite Green Degradation, Mechanism and Pathways by Morphology‐Tuned α‐NiMoO4 Photocatalyst

“…The octahedral (O h ) Mo species (200-415 nm) were observed that are associated ions. Furthermore, the absorption bands (723-823 nm) are associated with Ni 2+ (O h ) species (5,6,15). From Fig.…”

“…It also suggests the spin‐allowed d‐d transitions 3 A 2 g (F) → 3 T 1 g (P) of octahedrally coordinated Ni 2+ ions. Furthermore, the absorption bands (723–823 nm) are associated with Ni 2+ (O h ) species . From Fig.…”

“…Also, the high BET surface of NiMoO 4 photocatalyst provides better absorption of UV‐Vis light in the surface that creates more catalytic sites for photocatalytic enhancement via high amount of ROS generation . The charge transfer transition in MoO 4 2− ions with spin‐allowed d‐d transition of the Ni 2+ in UV‐Vis region also causes the high photocatalytic performances of NiMoO 4 . The photocatalytic degradation mechanism of MG by α ‐NiMoO 4 photocatalyst is shown in Fig.…”