Lanthanide-Based Dual Modulation in Hematite Nanospindles for Enhancing the Photocatalytic Performance

Abstract

Combining various approaches to elevate the photocatalytic performance of hematite (Fe 2 O 3 ) is a promising strategy yet still challenging. Herein, we successfully manipulate Fe 2 O 3 nanospindles with the prominent degradation of tetracycline (TC) under simulated solar-light irradiation via lanthanum (La) doping and the formation of an interface with cerium oxide (CeO 2 ) (denoted as La-Fe 2 O 3 /CeO 2 ). The optimized La-Fe 2 O 3 /CeO 2 hybrid exhibits a photocatalytic performance of TC degradation superior to those of pure Fe 2 O 3 , La-Fe 2 O 3 , and Fe 2 O 3 /CeO 2 , with 3 times the kinetic constant increment. Detailed experiments and theoretical calculations confirm that such excellent activity can be attributed to the dual-modulation strategy, which leads to an enhancement in the conductivity and ability to separate the photogenerated electron−hole pairs. Furthermore, the active species capture and electron spin resonance analyses reveal that • O 2 − , • OH, and h + active species play a vital role in the photocatalytic degradation process. This work could create more opportunity for the construction of high-activity photocatalysts for photocatalytic degradation and beyond.

Preparation of a CeO2 ball-core structure and its application in quantum dot sensitized solar cells

“…The binding energy of 917.1 eV indicated the presence of Ce 4+ . [39][40][41] As shown in Fig. 3(c), the XPS data for Ti 2p showed two peaks (Ti 2p 3/2 and Ti 2p 1/2 ) with binding energies of 459.2 and 464.9 eV, respectively, indicating the presence of Ti 4+ in the compound.…”

Fabrication of multifunctional 3D-flower-shaped NaTb(MoO4)2:Dy3+@Phen and NaTb(WO4)2:Dy3+@Phen nanoparticle materials for efficacious luminescence sensing of Fe2+ ions and photocatalytic degradation of rhodamine B in an aqueous medium

“…41 So far, numerous lanthanide-doped nanoparticles have been fabricated for the chemical sensing of Fe 2+ ions and degradation of RhB. 42,43 Such nanostructures display large optical signals that typically differ with the shape, size and morphology of the nanostructures. However, rare-earth-doped lanthanide molybdates and tungstates are gaining a lot of consideration due to their functions in photocatalysis, [44][45][46][47][48][49][50] optical fibres, thermal expansion materials, phosphors 51,52 and catalysis.…”

Nanoparticles Based on Prussian Blue for Biosensor Applications: A Review

“…4 The sensor can be miniaturized and integrated into various intelligent application devices, such as smartphones and smartwatches, for clinical care, 5 food analysis, 6 agricultural 7 and environmental monitoring, 8 and the in vivo detection of various diseases 9 and physical conditions. 10 With the rapid development of nanotechnology, nanomaterials with unique optical, 11,12 electrical, 13 and catalytic properties, 14 and biocompatibility 15 have been developed. The application of nanomaterials can significantly improve the response performance of biosensors.…”