Insight into the effect of Nd2O3 and CeO2 co-doped Gd2Zr2O7 ceramics without structural design: Phase evolution and chemical durability

Luo, Fa; Yuan, Beilong; Wen, Minru; Miao, Yulong; Lu, Yuexiang; Chen, Jing; Lu, Xirui; Wei, Guilin; Dong, Faqin

doi:10.1016/j.vacuum.2022.111256

Cited by 8 publications

(3 citation statements)

References 77 publications

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“…2 . The broad diffraction peaks associated with (111), (200), (220), (311), and (222) reflections of the defect-fluorite-structured Gd 2 Zr 2 O 7 with space group: Fm-3 m (PDF#80–0471) at 2θ = 29.41°, 34.12°, 48.90°, 58.26°, and 61.18° were detected and these results are in a good agreement with other researches 34 , 35 . However, the pyrochlore superstructures at 111 (14°), 311 (28°), 331 (37°), and 511 (45°) (space group: Fd-3 m) were not found.…”

Section: Resultssupporting

confidence: 91%

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Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Abdelbaky

Abdelghany

Oraby

et al. 2023

Sci Rep

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The photo-Fenton process is an appropriate method of the Advanced Oxidation Process that is used in the photocatalysis of organic dyes like crystal violet (CV). La3+ ion substituted gadolinium zirconium oxide Gd(2−x)La(x)Zr2O7 nanopowders (x = 0.1, 0.2, 0.3, and 0.5) have been successfully prepared by using sol–gel auto-combustion method to be used for the efficient photocatalysis of CV with photo-Fenton process. The well-crystallized defect-fluorite, structured with space group: Fm-3m, was detected using X-ray diffraction analysis. The lattice parameters were found to increase with the evaluated La3+ ion concentration. The grain size of the synthesized powders increased with the increase in La3+ ion content. The SAED patterns depicted fluorite structured fluorite. UV/Vis. spectrophotometer was used for the determination of band gap energy of Gd(2−x)La(x)Zr2O7 nanopowders which increased with increasing La3+ ion content. It was found to enhance from 4 to 3.6 eV. The visible spectrophotometer was used for determining unknown concentrations during the photocatalysis process to assure the effectiveness of the process. Overall, results illustrate that the photo-Fenton reaction on Gd(2−x)La(x)Zr2O7 performed excellently in removing crystal violet (CV). The photo-remediation ratio of CV reached 90% within 1 h.

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Section: Resultssupporting

confidence: 91%

“…3 . It should be observed that the absorption peak between wave numbers 1640 cm −1 and 3425 cm −1 is connected to the bending and vibrating of OH in water attributable to the water that has been absorbed from the atmosphere 34 . The absorption bands at 547 and 1425 cm −1 are caused by Gd–O vibrations.…”

Section: Resultsmentioning

confidence: 99%

Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Abdelbaky

Abdelghany

Oraby

et al. 2023

Sci Rep

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“…The high solubility of Fe 2 O 3 and Cr 2 O 3 within the zirconolite structure formed the basis to target the use of metallic Fe and Cr (representing a simplified stainless steel) alongside a CeO 2 surrogate fraction. Although the significant differences between Ce and Pu should be acknowledged, particularly in the research topics of their complex ligand formation, radiation, and dissolution response, [27][28][29][30][31][32] Ce served as the most widely used surrogate for both Pu(III) and Pu(IV), 10,21,23,26,[33][34][35][36][37] due to its relative affordability, non-toxicity, and comparable ionic radii corresponding to relevant coordination environment. Regarding the research on material chemistry, the availability of both Ce(III) and Ce(IV) oxidation states made it practical to study mechanisms of element incorporation, phase formation, and defect generation in wasteforms.…”

Section: Introductionmentioning

confidence: 99%

Co‐immobilization of a PuO₂ surrogate and contaminated stainless steel within a zirconolite matrix

Ai,

Sun,

Hao

et al. 2024

J Am Ceram Soc.

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The aqueous reprocessing of spent nuclear fuel generates a considerable amount of plutonium alongside contaminated stainless steel, necessitating meticulous handling for safe decommission and long‐term management. The present work investigated the co‐immobilization of CeO2 (as an inactive surrogate for PuO2) with metallic Fe and Cr (representing a simplified stainless steel) within a zirconolite ceramic wasteform, nominally targeting Ca1−xCexZrTi2−2xFexCrxO7. After sintering at 1400°C under an air atmosphere, the zirconolite phase constituted 90.8–95.1 wt.% of the product across the solid solution range of 0.05 ≤ x ≤ 0.25, alongside perovskite and baddeleyite secondary phases in varying proportion; no evidence of the unincorporated CeO2 or metallic and oxidized Fe or Cr were identified. Above x = 0.30 CeO2 was detected inferring, the solubility limit was reached. A polytype transformation from zirconolite 2M to 3T was confirmed by X‐ray diffraction and selected area electron diffraction results, with the relative fraction of the 3T phase gradually increasing to 49.5 wt.% at x = 0.30. Deconvolution of X‐ray photoelectron spectroscopy data revealed the partial reduction of Ce4+–Ce3+, whereas Fe and Cr species maintained trivalent, in agreement with the targeted substitution scheme. Benefitting from the excellent chemical flexibility of zirconolite structured compounds, the co‐immobilization approach may be an effective disposal pathway for Pu‐containing wastes and contaminated stainless steel residues.

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Degradation of Crystal Violet Using Gadolinium Zirconium Oxide (Gd2Zr2O7) Nanoparticles

Abdelbaky

Abdelghany

Oraby

et al. 2023

J Inorg Organomet Polym

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The demand for clean water free of pollution has become an urgent priority for humanity. Gd2Zr2O7 nanoparticles were successfully synthesized via sol–gel auto combustion as a type of pyrochlore to be used in the dye phytoremediation using a Fenton-like approach. Gd2Zr2O7 nanoparticles have been successfully prepared using a sol–gel auto-combustion strategy. The annealing process was performed in a furnace at 1100 °C for 2 h to form defect-fluorite structured Gd2Zr2O7 with space group Fm-3m. XRD analysis revealed that synthesized Gd2Zr2O7 nanoparticles were found to have crystallite sizes with lattice parameters of 28.5 nm and 10.524 + 0.02 Å, respectively. TEM micrographs showed the presence of a cubic-like structure with a size of about 17 nm. The band gap energy of the synthesized powders was found to be 3.8 eV relating to the impact of the crystallite size. The generated nanoparticles finally show a significant photo Fenton catalytic activity with an efficiency of 90% for the photocatalysis of crystal violet dye after 60 min. It was determined that the substantial absorption of Gd2Zr2O7 in the visible-light region, which was synergistically activated by both Gd3+ and Zr4+ ions, was the cause of the large surface area of the scattered microstructure and reactive OH. formation.

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Insight into the effect of Nd2O3 and CeO2 co-doped Gd2Zr2O7 ceramics without structural design: Phase evolution and chemical durability

Cited by 8 publications

References 77 publications

Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Co‐immobilization of a PuO₂ surrogate and contaminated stainless steel within a zirconolite matrix

Degradation of Crystal Violet Using Gadolinium Zirconium Oxide (Gd2Zr2O7) Nanoparticles

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Insight into the effect of Nd2O3 and CeO2 co-doped Gd2Zr2O7 ceramics without structural design: Phase evolution and chemical durability

Cited by 8 publications

References 77 publications

Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Efficacious elimination of crystal violet pollutant via photo-Fenton process based on Gd(2−x)La(x)Zr2O7 nanoparticles

Co‐immobilization of a PuO2 surrogate and contaminated stainless steel within a zirconolite matrix

Degradation of Crystal Violet Using Gadolinium Zirconium Oxide (Gd2Zr2O7) Nanoparticles

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Co‐immobilization of a PuO₂ surrogate and contaminated stainless steel within a zirconolite matrix