Enhancement of high entropy oxide (La0.2Nd0.2Sm0.2Gd0.2Y0.2)2Zr2O7 mechanical and photocatalytic properties via Eu doping

Liu, Shixin; Du, Mingrun; Ge, Yanfeng; Li, Zepeng; Srivastava, G. P.; Wang, Jinhua; Wei, Tong; Zou, Yunling; Li, Xiaodong; Li, Yanchun; Wang, Mingchao

doi:10.1007/s10853-022-07124-9

Cited by 8 publications

(2 citation statements)

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“…Figures8(c) and 8(d) show the valance states of Eu ion in HEMA and the single-component ceramics. The binding energies of Eu 2+ are located at 1125 and 1155 eV, while the binding energies of Eu 3+ are located at 1134 and 1164 eV[53,54]. The XPS results indicate that only Eu 3+ exists in the single-component EMA ceramics (Fig.8(d)).…”

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confidence: 89%

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Zhou¹,

LIU²,

Tianzhe³

et al. 2023

Journal of Advanced Ceramics

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It is generally reported that the grain growth in high-entropy ceramics at high temperatures is relatively slower than that in the corresponding single-component ceramics owing to the so-called sluggish diffusion effect. In this study, we report a fast grain growth phenomenon in the high-entropy ceramics (La 0.2 Nd 0.2 Sm 0.2 Eu 0.2 Gd 0.2 )MgAl 11 O 19 (HEMA) prepared by a conventional solid-state reaction method. The results demonstrate that the grain sizes of the as-sintered HEMA ceramics are larger than those of the corresponding five single-component ceramics prepared by the same pressureless sintering process, and the grain growth rate of HEMA ceramics is obviously higher than those of the five single-component ceramics during the subsequent heat treatment. Such fast grain growth phenomenon indicates that the sluggish diffusion effect cannot dominate the grain growth behavior of the current high-entropy ceramics. The X-ray photoelectron spectroscopy (XPS) analysis reveals that there are more oxygen vacancies (O V ) in the high-entropy ceramics than those in the single-component ceramics owing to the variable valance states of Eu ion. The high-temperature electrical conductivities of the HEMA ceramics support this analysis. It is considered that the high concentration of O V and its high mobility in HEMA ceramics contribute to the accelerated migration and diffusion of cations and consequently increase the grain growth rate. Based on this study, it is believed that multiple intrinsic factors for the high-entropy ceramic system will simultaneously determine the grain growth behavior at high temperatures.

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confidence: 89%

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Zhou¹,

LIU²,

Tianzhe³

et al. 2023

Journal of Advanced Ceramics

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“…Currently, many low-concentration pollutants are difficult to degrade quickly when using photocatalytic materials; for example, Shixin Liu [19] treated RhB with Eu-doped high-entropy oxides, and only 10% of the RhB was degraded in 20 min. Cu 2−x Se/CdS was used to treat 10 mg/L RhB, only approximately 20% could be treated in 30 min, and the rate of low-concentration pollutants was not effective [20], the catalytic active sites on the surface of pure photocatalytic materials are not fully utilized and cannot reach the optimal degradation state, the photocatalytic materials and adsorbent materials are combined, and the abundant adsorption active sites of the adsorbent materials provide a large mass transfer rate for the catalytic active sites.…”

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confidence: 99%

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

Yuan,

Cui,

Zhang

2024

Water

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Low-concentration antibiotic wastewater is difficult to treat rapidly using conventional photocatalysts. For this reason, this paper simplified the traditional sol–gel method to prepare Fe3+-TiO2/AC composites and characterized the properties of the composites using FT-IR, XRD, SEM, BET, and TEM. The results demonstrated that iron was uniformly dispersed on the surface of the composites, and the activated carbon (AC) was successfully loaded with iron-doped titanium dioxide. Afterward, ciprofloxacin (CIP) was used as the target degradant, and the effects of different activated carbon loadings, iron-doping, pH, initial concentrations, and UV light intensities on the removal of ciprofloxacin were investigated. The repetitive photocatalytic stability of the composites was studied, and the reaction mechanism was explored by using free radical quenching experiments. The results demonstrated that while iron doping reduced the rate at which photogenerated electrons and holes could combine, loading AC increased the usage efficiency of the composites’ adsorption and catalytic active sites. According to the parameter tests, the circumstances that led to the highest CIP degradation efficiency (94.59%) were as follows: 10 mg/L CIP, 0.5 g/L 0.2%Fe3+-TiO2/20%AC, and solution pH of 7 under 40 min of UV light irradiation. In addition, the Fe3+-TiO2/AC composite material has excellent cyclic stability, the degradation rate of CIP can still reach 87.73% at 60 min after four repeated degradation tests under the same conditions. The applicability of this method could be expanded to the treatment of various industrial organic pollutants in water.

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3D Tremella‐Like g‐C₃N₄/TiO₂/HNTs Heterojunction Photocatalyst for Enhanced Photocatalytic Degradation of Rhodamine B From Water

Di,

Zhang,

Jiang

et al. 2024

ChemistrySelect

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Among the traditional treatment processes for purifying wastewater contaminated with Rhodamine B (RhB), semiconductor photocatalysis is the most effective technology because it can oxidize organic pollutants and convert them into CO2, H2O, and other harmless molecules in a safe and efficient manner. According to literature research, it is feasible to enhance the performance of g‐C3 N4 as a photocatalyst by constructing a heterojunction with other photocatalytic materials. Morphological regulation of carbon nitride (g‐C3N4) is a viable strategy for improving its photocatalytic activities. By controlling the morphology of g‐C3N4, factors such as light absorption, specific surface area, charge separation, and reaction sites can be optimized to enhance its photocatalytic efficiency. Three‐dimensional tremella‐like carbon nitride (3DT‐CN) and 3D‐CN/TiO2/HNTs (halloysite nanotubes) were prepared using bubble templates and an impregnation method respectively. The Z‐scheme heterojunction structure constructed by 3D‐CN and TiO2 promotes electron‐hole separation. Catalytic experiments demonstrated that under irradiation for 120 min, the 3D‐CN/TiO2/HNTs catalyst could eliminate 86.48 % of Rhodamine B (RhB). Additionally, active radicals such as e‐, h+, ⋅OH, and ⋅O2‐ are involved in RhB degradation. Therefore, the three‐dimensional tremella‐like 3D‐CN/TiO2/HNTs heterojunction photocatalyst has great potential for environmental purification.

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Enhancement of high entropy oxide (La0.2Nd0.2Sm0.2Gd0.2Y0.2)2Zr2O7 mechanical and photocatalytic properties via Eu doping

Cited by 8 publications

References 50 publications

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

3D Tremella‐Like g‐C₃N₄/TiO₂/HNTs Heterojunction Photocatalyst for Enhanced Photocatalytic Degradation of Rhodamine B From Water

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Enhancement of high entropy oxide (La0.2Nd0.2Sm0.2Gd0.2Y0.2)2Zr2O7 mechanical and photocatalytic properties via Eu doping

Cited by 8 publications

References 50 publications

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Fast grain growth phenomenon in high-entropy ceramics: A case study in rare-earth hexaaluminates

Performance of Iron-Doped Titanium Dioxide-Loaded Activated Carbon Composite Synthesized by Simplified Sol–Gel Method for Ciprofloxacin Degradation under Ultraviolet Light

3D Tremella‐Like g‐C3N4/TiO2/HNTs Heterojunction Photocatalyst for Enhanced Photocatalytic Degradation of Rhodamine B From Water

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3D Tremella‐Like g‐C₃N₄/TiO₂/HNTs Heterojunction Photocatalyst for Enhanced Photocatalytic Degradation of Rhodamine B From Water