Facile synthesis of iron oxide coupled and doped titania nanocomposites: tuning of physicochemical and photocatalytic properties

Abstract

A facile hydrothermal method was firstly employed to synthesize iron oxide coupled and doped titania nanocomposites using an aqueous solution of titanium nitrate. The present nanocomposites exhibit altered compositional, optical, electrical, magnetic and photocatalytic properties with respect to varying dosage of iron in the titania matrix. The architecture of characteristic iron oxide such as Fe 2 O 3 coupled with titania was confirmed by 57 Fe Mössbauer spectroscopy and X-ray absorption fine structure spectroscopic measurements. The enhanced photocatalytic activity was demonstrated by comparing with that of pure hematite, anatase TiO 2 , rutile TiO 2 and P25 in the degradation of methylene blue under visible light (l > 480 nm) irradiation in an aqueous suspension. The strategy presented here gives a promising route towards the development of a metal oxide coupled and doped semiconductor material for applied photocatalysis and related applications.

Self-organized and self-assembled TiO2 nanosheets and nanobowls on TiO2 nanocavities by electrochemical anodization and their properties

“…The first mechanism of emission is generated by self-trapped excitons (STE) at 415 nm band (peak 1 for all structures) [45]. Other mechanisms are single-ionized oxygen vacancies (Vo * ) at 437 nm, 443 nm, 448 nm, (peak 2 for the four structures) and doubly-ionized oxygen vacancies (Vo ** ) at 471 nm, 495 nm, and 621 nm (peak 3) [46][47][48][49][50][51]. These nanomaterials had another emission band of 750 nm to 850 nm (peak 4) that is associated with excited states of Ti 3+ [52].…”

Rational synthesis of Na and S co-catalyst TiO2-based nanofibers: presence of surface-layered TiS3 shell grains and sulfur-induced defects for efficient visible-light driven photocatalysis

“…A green emission observed at around 490 nm arises due to the charge transition from the conduction band to oxygen vacancies or donor-acceptor recombination states. 41 By comparing the different forms of surface modication, it can be understood that the suldation process initiates sulfur-based defect sites and induces Na ion functionalization, due to oxygen vacancies associated with Ti 3+ defect states. Photoluminescence is a surface phenomenon, and modication of the TiO 2 NF surface with Na and S signicantly affects the uorescence emission.…”

Retracted: Dual Effects of Nanostructuring and Oxygen Vacancy on Photoelectrochemical Water Oxidation Activity of Superstructured and Defective Hematite Nanorods

“…This insinuates that the growth of 1D rods had originated from “2D” flakes, and the “defect” flakes were etched away by the Ar atmosphere treatment and further formed rods with (104) and (110) planes (see Figure S5 in the Supporting Information) . Generally, the (110) plane is known to provide a well‐diffused electron path, and the (104) plane offers a faster water oxidation reaction . Thus, the growth of the (110) planes, where electrons can diffuse, and the (104) planes, where oxidation reactions are favored, leads to the best PEC performance in Ar (Figure a).…”

“…The above results indicate that the improved PEC performance originates from a more effective charge transfer capability at the α‐Fe 2 O 3 NRs/substrate interface. The formation of (104) and (110) planes combined with suboxide layers provide efficient charge transport to the back contact . The structure of α‐Fe 2 O 3 is extensively investigated through various spectroscopic techniques.…”