Facile synthesis of nanoceria by a molten hydroxide method and its photocatalytic properties

Xia, Xuewen; Lan, Yuanpei; Li, Junqi; Chen, Chaoyi; Xu, Benjun; Luo, Xiaoyan; Mao, Xisong

doi:10.1016/j.jre.2019.11.007

Cited by 18 publications

(6 citation statements)

References 52 publications

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“…In the Fourier transform infrared (FTIR) spectra, peaks corresponding to stretching and bending vibrations of hydroxyl groups on the surface of nanoparticles are observed at 3400 and 1630 cm −1 , respectively, for all nanoparticles (Figure 5a). 69 In addition, peaks at 500−600 cm −1 for the O−Ce−O stretching vibration, 70,71 peaks at ∼1380 cm −1 for the vibration mode of Ce−O−Ce, 72,73 and small peaks at 1050 cm −1 for physical absorption of water 74 ) are found in the spectra of CeCb nanoplates, CeCb nanosaucers, and Ce-CDI-IM CeONPs, but not in Ce-IM CeONPs. 75,76 In the spectrum of Ce-IM CeONPs, a sharp peak for the presence of nitrate ions on the surface of nanoparticles appears at 1382 cm −1 , suggesting that there is a difference in surface properties between Ce-IM CeONPs and Ce-CDI-IM CeONPs.…”

Section: Resultsmentioning

confidence: 97%

Facile Room-Temperature Synthesis of Cerium Carbonate and Cerium Oxide Nano- and Microparticles Using 1,1′-Carbonyldiimidazole and Imidazole in a Nonaqueous Solvent

Choi

Kim

2021

ACS Omega

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Ceria nanoparticles (CeONPs) are versatile materials due to their unique catalytic properties, and cerium carbonate particles (CeCbPs) have been widely used as precursors for cerium oxide due to their ease of production. Urea is a widely used precipitant and a source of carbonate ions for the synthesis of CeONPs and CeCbPs, and the reaction temperature is important for controlling the rate of urea decomposition. However, the precise control of the temperature is often difficult, especially in large-scale reactions. Herein, we propose a homogeneous precipitation method that uses 1,1′-carbonyldiimidazole (CDI) and imidazole in acetone without heating. The decomposition rate of CDI can be controlled by the amount of water in the reaction mixture. In the synthesis of CeCbPs, unique particle morphologies of plate-, flying-saucer-, and macaron-like shapes and a wide range of sizes from 180 nm to 13 μm can be achieved by adjusting the amount of CDI, imidazole, and water in the reaction. These CeCbPs are transformed into ceria particles by calcination while maintaining their characteristic morphology. Moreover, the direct synthesis of 130 nm spherical CeONPs was possible by decreasing the amount of CDI in the reaction and the mixing time. These nanoparticles exhibited higher production efficiency and superior reactive oxygen species (ROS) scavenging properties compared to the other CeONPs obtained from calcination. These results demonstrate a novel method using CDI and imidazole in the synthesis of CeONPs and CeCbPs without the aid of a heating process, which may be useful in the large-scale synthesis and application of CeO nanomaterials.

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Section: Resultsmentioning

confidence: 97%

Facile Room-Temperature Synthesis of Cerium Carbonate and Cerium Oxide Nano- and Microparticles Using 1,1′-Carbonyldiimidazole and Imidazole in a Nonaqueous Solvent

Choi

Kim

2021

ACS Omega

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“…PL spectra, as shown in Figure 8 , were employed to investigate the recombination efficiency of photoinduced electrons and holes, where a lower recombination rate is characterized by a lower PL intensity [ 17 , 67 ]. It can be found that all PL spectra show strong blue emission peaks centered at 430–490 nm, which is associated with the defect levels localized between the Ce 4f and O 2p bands [ 68 , 69 , 70 , 71 ].…”

Section: Resultsmentioning

confidence: 99%

“…It is generally accepted that the photocatalytic application of ceria is impeded by its wide band gap ~3.2 eV and a quick recombination of photogenerated electrons (e − ) and holes (h + ) [ 16 , 17 ]. Attributing to the redox characteristic of Ce 4+ /Ce 3+ pairs, oxygen vacancy is an inescapable topic for researching on ceria based catalysts [ 1 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Insight into the Contributions of Surface Oxygen Vacancies on the Promoted Photocatalytic Property of Nanoceria

Lan

Xia

et al. 2021

Nanomaterials

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Oxygen vacancies (OVs) have critical effects on the photoelectric characterizations and photocatalytic activity of nanoceria, but the contributions of surface OVs on the promoted photocatalytic properties are not clear yet. In this work, we synthesized ceria nanopolyhedron (P-CeO2), ceria nanocube (C-CeO2) and ceria nanorod (R-CeO2), respectively, and annealed them at 600 °C in air, 30%, 60% or pure H2. After annealing, the surface OVs concentration of ceria elevates with the rising of H2 concentration. Photocatalytic activity of annealed ceria is promoted with the increasing of surface OVs, the methylene blue photodegradation ratio with pure hydrogen annealed of P-CeO2, C-CeO2 or R-CeO2 is 93.82%, 85.15% and 90.09%, respectively. Band gap of annealed ceria expands first and then tends to narrow slightly with the rising of surface OVs, while the valence band (VB) and conductive band (CB) of annealed ceria changed slightly. Both of photoluminescence spectra and photocurrent results indicate that the separation efficiency of photoinduced electron-hole pairs is significantly enhanced with the increasing of the surface OVs concentration. The notable weakened recombination of photogenerated carrier is suggested to attribute a momentous contribution on the enhanced photocatalytic activity of ceria which contains surface OVs.

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“…Finally, we would like to point out that the Ce 3+/4+ ratio on a nanoceria NP has been easily estimated by titration with ferrocyanide, a procedure that could become a rapid assessment tool for evaluation nanoceria in liquid environments. Normally, the determination of the Ce 3+ /Ce 4+ ratio is made by X-ray photoelectron spectroscopy (XPS) 26 and eventually electron magnetic resonance (EPR) 27 ; however, this techniques are complex and costly. This is relevant in the field of biotechnology and biological enzymes and their outstanding specificity and high catalytic activity 28,29,30 .…”

Section: Discussionmentioning

confidence: 99%

Nanoceria dissolution at acidic pH by breaking off the catalytic loop

et al. 2022

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Facile synthesis of nanoceria by a molten hydroxide method and its photocatalytic properties

Cited by 18 publications

References 52 publications

Facile Room-Temperature Synthesis of Cerium Carbonate and Cerium Oxide Nano- and Microparticles Using 1,1′-Carbonyldiimidazole and Imidazole in a Nonaqueous Solvent

Facile Room-Temperature Synthesis of Cerium Carbonate and Cerium Oxide Nano- and Microparticles Using 1,1′-Carbonyldiimidazole and Imidazole in a Nonaqueous Solvent

Insight into the Contributions of Surface Oxygen Vacancies on the Promoted Photocatalytic Property of Nanoceria

Nanoceria dissolution at acidic pH by breaking off the catalytic loop

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