Synthesis of Reduced Grapheme Oxide as A Platform for loading β-NaYF4:Ho3+@TiO2Based on An Advanced Visible Light-Driven Photocatalyst

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.

Hybrid System for Local Drug Delivery and Magnetic Hyperthermia Based on SPIONs Loaded with Doxorubicin and Epirubicin

“…As can be seen, two peaks for binding energies about 160.5 eV and 162.7 eV can be deconvoluted into peaks for Ho 4d 3/2 and Ho 4d 5/2 . It can be ascribed to Ho 3+ ions that are incorporated into the structure of iron oxide nanoparticles [ 57 ]. The following band of about 153.3 eV binding energy comes from the Si 2p present in the carbon-based tape containing a small number of additives like Si-based compounds, such as siloxane.…”

Easy Synthesis and Characterization of Holmium-Doped SPIONs

“…The experimental results are similar to the literature data for iron at different oxidation states [ 51 ]. Figure 8 b presents the peaks at binding energies 160.5 eV and 162.7 eV, characteristic to Ho 3+ 4d 5/2/ and 4d 3/2 , indicating that holmium has been incorporated into the crystal lattice of iron oxide [ 52 ]. Due to the low amount of holmium in our samples, these peaks are of low intensity; therefore, their further analysis can be inaccurate.…”

Enhanced Visible Light-Driven Photocatalytic Activities and Photoluminescence Characteristics of BiOF Nanoparticles Determined via Doping Engineering

“…35 In the F 1s XPS spectrum, only one intense peak at 682.8 eV corresponding to F − 1s was observed, as demonstrated in Figure 3c. 36 Additionally, the XPS spectrum shown in Figure 3d consisted of two bands, and their binding energies were approximately 1083.3 and 1109.3 eV, respectively, which were ascribed to Sm 3+ 3d 5/2 and Sm 3+ 3d 3/2 . 37 The XPS results further indirectly confirmed the successful synthesis of Sm 3+ -activated BiOF nanoparticles.…”