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Abstract
In this paper a novel visible light-driven ternary compound photocatalyst (β-NaYF4:Ho3+@TiO2-rGO) was synthesized using a three-step approach. This photocatalyst was characterized using X-ray diffraction, Raman scattering spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, Transmission electron microscopy, X-ray photoelectron spectroscopy, fluorescence spectrometries, ultraviolet-visible diffuse reflectance spectroscopy, Brunauer–Emmett–Teller surface area measurement, electron spin resonance, three-dimensional fluorescence spectroscopy, and photoelectrochemical properties. Such proposed photocatalyst can absorb 450 nm visible light while emit 290 nm ultraviolet light, so as to realize the visible light-driven photocatalysis of TiO2. In addition, as this tenary compound photocatalyst enjoys effecitve capacity of charge separation, superior durability, and sound adsorb ability of RhB, it can lead to the red shift of wavelength of absorbed light. This novel tenary photocatalyst can reach decomposition rate of RhB as high as 92% after 10 h of irradiation by visible-light Xe lamp. Compared with the blank experiment, the efficiency was significantly improved. Recycle experiments showed that theβ-NaYF4:Ho3+@TiO2-rGOcomposites still presented significant photocatalytic activity after four successive cycles. Finally, we investigated visible-light-responsive photocatalytic mechanism of the β-NaYF4:Ho3+@TiO2-rGO composites. It is of great significance to design an effective solar light-driven photocatalysis in promoting environmental protection.
Highlights
To resolve this problem, many attempts have been made to improve the photocatalytic activity of TiO2 by inhibiting the recombination of photogenerated electron–hole pairs and extending the absorption range of TiO2 towards Vis region, so as to realize a better use of solar energy[11,12,13]
This indicates that the samples resulted from hydrothermal synthesis are of high purity and excellent crystallinity, and such excellent crystallinity plays a vital role in determmining the photocatalysis efficiencies[54]
It can be noted that the diffraction peak of reduced graphene oxide (rGO) is not reflected in such X-ray diffraction (XRD) pattern, which we think may be due to its low proportion in compound material and its low concentration that is under the LOD of XRD
Summary
Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven. Further innovative researches are needed to realize large scale practical application of TiO2-based photocatalysts for solving environmental and energy problems To resolve this problem, many attempts have been made to improve the photocatalytic activity of TiO2 by inhibiting the recombination of photogenerated electron–hole pairs and extending the absorption range of TiO2 towards Vis region, so as to realize a better use of solar energy[11,12,13]. Benefiting from the high specific surface area and the flexible sheet-like structure, rGO emerged as an excellent platform on which the core–shell microcrystal β-NaYF4:Ho3+@TiO2 can be load to form the ternary composite β-NaYF4:Ho3+@TiO2– rGO In this photocatalyst, it is expected to emit UV light after absorbing Vis light of the solar spectrum during the loading process of UC microcrystals, the optical response of the β-NaYF4:Ho3+@TiO2–rGO will. We conducted detailed discussion on the Vis responsive photocatalytic mechanism of β-NaYF4:Ho3+@TiO2–rGO
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