Silver decorated CeO2 nanoparticles for rapid photocatalytic degradation of textile rose bengal dye

Abstract

High quality silver (Ag) decorated CeO2 nanoparticles were prepared by a facile one-step chemical method. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), High resolution transmission electron microscopy (HR-TEM), fourier transform infrared spectrometer (FT-IR), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), UV–Visible absorption (UV–Vis), photoluminescence (PL) and thermogravimetric analysis. The decoration of Ag on CeO2 surface was confirmed by XRD, EPR and HR-TEM analysis. Harmful textile pollutant Rose Bengal dye was degraded under sunlight using the novel Ag decorated CeO2 catalyst. It was found that great enhancement of the degradation efficiency for Ag/CeO2 compared to pure CeO2, it can be ascribed mainly due to decrease in its band gap and charge carrier recombination rate. The Ag/CeO2 sample exhibited an efficient photocatalytic characteristic for degrading RB under visible light irradiation with a high degradation rate of 96% after 3 h. With the help of various characterizations, a possible degradation mechanism has been proposed which shows the effect of generation of oxygen vacancies owing to the decoration of Ag on the CeO2 surface.

Metal-Mediated Nanoscale Cerium Oxide Inactivates Human Coronavirus and Rhinovirus by Surface Disruption

“… 31 − 33 The observed proportion of Ag 0 states suggest that silver is predominantly metallic, in agreement with the previous report 31 − 33 In the case of AgCNP2, the Ag 3d spectra are comprised of only Ag o metallic state peaks centered at 368.2 eV (Ag 3d5/2) and 374.3 eV (Ag 3d3/2). 31 − 33 It is worth emphasizing that the full-width half-maximum value for metallic Ag 0 in the Ag 3d peak is increased in both formulations (∼1.25 eV) compared to pure silver (∼150 nm diameter particles) nanopowder (∼0.76 eV) ( SI Figure S3 ). This change can be ascribed to decreasing silver-phase dimensions and related confinement effects, as well as decreased final state electronic screening.…”

“…Ag 3d spectra ( Figure 2 D) collected for both formulations exhibited a doublet (3d 3/2 and 3d 5/2 ) centered at 368.2 and 374.2 eV, related to metallic Ag (Ag 0 ). 31 − 33 In addition, a doublet at 367.5 and 373.2 eV ascribed to Ag + is observable only for AgCNP1 (with 73.8% of silver in Ag 0 state). 31 − 33 The observed proportion of Ag 0 states suggest that silver is predominantly metallic, in agreement with the previous report 31 − 33 In the case of AgCNP2, the Ag 3d spectra are comprised of only Ag o metallic state peaks centered at 368.2 eV (Ag 3d5/2) and 374.3 eV (Ag 3d3/2).…”

“… 31 − 33 In addition, a doublet at 367.5 and 373.2 eV ascribed to Ag + is observable only for AgCNP1 (with 73.8% of silver in Ag 0 state). 31 − 33 The observed proportion of Ag 0 states suggest that silver is predominantly metallic, in agreement with the previous report 31 − 33 In the case of AgCNP2, the Ag 3d spectra are comprised of only Ag o metallic state peaks centered at 368.2 eV (Ag 3d5/2) and 374.3 eV (Ag 3d3/2). 31 − 33 It is worth emphasizing that the full-width half-maximum value for metallic Ag 0 in the Ag 3d peak is increased in both formulations (∼1.25 eV) compared to pure silver (∼150 nm diameter particles) nanopowder (∼0.76 eV) ( SI Figure S3 ).…”

Activity of Ag/CeZrO2, Ag+K/CeZrO2, and Ag-Au+K/CeZrO2 Systems for Lean Burn Exhaust Clean-Up

“…This difference may be attributed to the interaction of silver with the oxygen from the cerium-zirconium oxide; however, it requires further investigation. In a paper recently published in Nature [26], it has been noted that the interaction of silver with ceria can lead to a lattice parameter of ceria higher than for bulk ceria: 5.414 Å vs. 5.411 Å.…”

Preparation, Characterization of Green Synthesis CeO2 Nanoparticles and Their Photocatalytic Activity towards Malachite Green Dye

“…For CeO 2 nanoparticles, the spectrum showed an intense emission peak in the blue region 417 nm corresponding to the surface-related defects and the other peaks at 468 nm and 480 nm are attributed to the dislocation or oxygen vacancies. [43] In addition, emission at 565 nm could be anticipated from the oxygen vacancies associated with defects. [44] In the case of (CeO 2 ) cs nanoparticles, the emission was observed with much lower intensity as compared to the (CeO 2 ) gs nanoparticles.…”