JOURNAL OF NUCLEAR MATERIALS
·
2020
·
IF 2.485
Yi Ding,Zhengdi Jiang,Tianheng Xiong,Zimei Bai,Dandan Zhao,Hui Dan,Tao Duan
Zircon is important ceramic used widely due to its excellent properties, in particular for nuclear waste immobilization . However, it is difficult to obtain mono-phase zircon with high yield, usually result in double-phase ZrO 2 /ZrSiO 4 ceramics. Herein, Ce-doped double-phase 0.2Zr 1- x Ce x O 2 /Zr 1- y Ce y SiO 4 (0 ≤ x + y ≤ 1) ceramics were fabricated and their phase and microstructure evolution were studied. The results demonstrated that Ce content has great influence on the phase composition and microstructure. The ceramics with 0 ≤ x + y < 0.1 are tetragonal-ZrSiO 4 , monoclinic-ZrO 2 and tetragonal-ZrO 2 phases, with 0.1 ≤ x + y ≤ 0.3 are tetragonal-ZrSiO 4 , monoclinic-ZrO 2 , tetragonal-ZrO 2 and cubic-ZrO 2 phases, with 0.3 < x + y ≤ 0.6 are tetragonal-ZrSiO 4 , tetragonal-ZrO 2 and cubic-ZrO 2 phases, and with 0.6 < x + y ≤ 1 are cubic-ZrO 2 and Ce 2 Si 2 O 7 phases. With increasing Ce-doping content, the ZrSiO 4 retained the tetragonal phase, while ZrO 2 transformed from monoclinic to stable cubic phase. Furthermore, lattice parameters , grain size and compactness increased with increasing Ce content.
研究领域:
材料科学
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核废物处理
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yumei Qin,Zhaoyang Ding,Wenwei Guo,Xiaolu Guo,Cheng Hou,Bang-Ping Jiang,Chun-Guang Liu,Xing-Can Shen
The utilization of diffusive solar energy through photocatalytic processes has received tremendous attention. Herein, a full-solar-spectrum photocatalyst with strong near-infrared (NIR) photoactivity, which is based on the synergy of oxygen vacancies (OVs) and doped boron that is cointegrated into zirconia (B@ZrO2–OV), is designed in this work. The doped photocatalyst is prepared via a controlled one-step NaBH4 reduction from white ZrO2. Density functional theory (DFT) calculations reveal that simultaneously introduced OVs and boron dopants on ZrO2 induced a narrow band gap (4.78 eV) and achieved charge separation (work function of 4.12 eV), thus confirming its excellent photocatalytic activity in the degradation of rhodamine B under NIR irradiation. In contrast, oxygen-deficient ZrO2 and white ZrO2 were inactive under NIR light. Therefore, this synergistic strategy provides an efficient way to use the narrow band gap of a classic semiconductor zirconia as a highly efficient catalyst for full-solar-spectrum-driven photocatalysis.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Jiale Han,Mengyuan Zhao,Fang Li,Meimei Guo,Yunhang Liu,Qiwen Ran,Zhankui Wang,Hongyuan Zhao
We developed an economical and environment-friendly technique for preparing the expired mung bean-derived porous carbon (EMBPC), which possessed large specific surface area and 3D interlinked carbon conductive network. Zirconium dioxide (ZrO 2 ) nanoparticles were further incorporated into the porous structure of EMBPC to form the EMBPC@ZrO 2 composite, which was served as electrode sensitizer for the fabrication of EMBPC@ZrO 2 /GCE sensor. EMBPC exhibited superior conductivity property and large electroactive area, which helped enhance the charge transfer efficiency between electrolyte and sensing electrode. ZrO 2 nanoparticles with good biocompatibility achieved the efficient adsorption of methyl parathion (MP) owing to the recognition of ZrO 2 towards the phosphate groups of MP. Furthermore, EMBPC with porous carbon conductive structure could make up for the inherent disadvantage of ZrO 2 nanoparticles in the term of electrical conductivity. The EMBPC@ZrO 2 /GCE sensor achieved the highly sensitive MP detection (LOD: 8.77 nM) in linear MP concentration range of 0.01–10 μM. The satisfactory practical property was realized at the EMBPC@ZrO 2 /GCE sensor with satisfactory recovery rates of 91.95–124.72% and low RSD% of 1.21–3.35% for the electrochemical detection of MP in food samples.
研究领域:
材料科学
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环境科学
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分析化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
·
IF 12.2
Xiaoyang Li,Han Zhang,Jiahang Liu,Yingying Chu,Mengying Qian,Zhichao Yang,Ming Hua,Weiming Zhang
Chloride ion (Cl − ) is ubiquitous in diverse water bodies, yet poses a longstanding challenge in water pollution control by hindering the efficiency of pollutant degradation. Herein, we proposed a novel concept involving the direct utilization of endogenous Cl − ions in water for rapid water purification within a non-redox zirconium oxide (ZrO 2 )-activated peroxymonosulfate (PMS) system. In this process, PMS was complexed on the ZrO 2 surface through inner-sphere coordination, and effectively activated by the partial electron cloud deviation from Zr(IV) sites to PMS, thereby forming a metastable surface complex with an elevated redox potential. Afterwards, the coexistence of Cl − could trigger the transformation of the reactive complex into free chlorine species, thus leading to a 255.0-fold enhancement in the elimination rate of micropollutants compared with the ZrO 2 /PMS system. Quantitative structure-activity relationship analysis revealed that the ZrO 2 /PMS/Cl − system displayed strong target-dependence towards electron-rich compounds, showcasing a faster oxidation rate for pollutants with higher E HOMO energy levels. Significantly, the novel system performed robust resistance to complex water matrices, achieved low oxidant consumption for pollutant removal, and demonstrated adaptation across a broad range of Cl − concentrations (1.0–100.0 mM). Overall, our findings provide new mechanistic insights into the influence of Cl − ions on PMS activation, which refresh the understanding of the role of Cl − ions on pollutant degradation, and help to guide the treatment design for chloride-containing wastewater.
研究领域:
环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2017
·Vol. 83
·期 1
·100-108
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IF 1.575
Liu Benxue,Ju Wei,Zhang Jing,Fan Huili,Wang Qichun,Yi Xibin,Yu Zhichao,Wang Xinqiang
Abstract In the present work, RF/SiO 2 aerogels reinforced by zirconia (ZrO 2 ) were fabricated by a sol–gel process combined with N 2 -ethanol supercritical drying. The physical properties and microstructures of the aerogels were investigated by uniaxial compression, X-ray diffraction, N 2 physico-adsorption, scanning electron microscopy, X-ray photoelectron spectroscopy, and infrared spectrum. The compressive strengths of the aerogels were improved obviously with the addition of ZrO 2 . The composite aerogels remained amorphous state even the percentage of ZrO 2 reached up to 6.77 wt%. The pore sizes of the aerogels with various ZrO 2 were hierarchical and the Brunauer-Emmett-Teller surface area increased distinctly with the increase of ZrO 2 . On the contrary, the aerogel particle sizes decreased as the increase of ZrO 2 . In our opinion, the enhanced compressive strengths derive from both of the varied pore structures and the decrease of the particle sizes. Graphical Abstract
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2020
·
IF 4.495
Zhengdi Jiang,Tianheng Xiong,Zimei Bai,Dandan Zhao,Wenping Yang,Yun Peng,Hui Dan,Yi Ding,Tao Duan
Zircon (ZrSiO 4 ) ceramics have been widely used in the field of radioactive waste immobilization and ceramics industry. However, preparation of zircon ceramics suffers from low yield due to the variable Si/Zr molar ratio. Herein, we reported preparation of x SiO 2 /ZrSiO 4 (0 ≤ x ≤ 0.3) ceramics using SiO 2 and ZrO 2 as raw materials. The effects of Si/Zr molar ratio and sintering temperature on the phase formation, phase and microstructure evolutions were investigated. The results indicated that zircon formation efficiency increased with increasing Si/Zr molar ratio from 1 to 1.2, while decreased with increasing Si/Zr molar ratio from 1.2 to 1.3. The as-prepared ceramics with Si/Zr molar ratio of 1.1 and 1.2 were single zircon phase, while with Si/Zr molar ratio of 1 and 1.3 exhibited coexistence of zircon and cristobalite phases. The grain growth and compactness can be enhanced by increasing Si/Zr molar ratio. Furthermore, the relative densities increased with increasing Si/Zr molar ratio.
研究领域:
材料科学
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核废料处理
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xiaotong Jin,Kangkang Yuan,Wenjia Han,Xinqiang Wang,Chengshun Li
In the present work, four oxides (SiO 2 , TiO 2 , LaO 1.5 , or CeO 2 ) were selected as additives to increase the surface areas and the pore wall stability of mesoporous zirconia (ZrO 2 ) fibers in virtue of enhancing the skeleton stability and hindering the grain growth. The preparation, characterization, and thermal evolution of mesoporous ZrO 2 fibers incorporated with different amounts of oxide additive and simultaneously combined with heat treatment via water vapour are presented. The effects of different oxide additives on the crystallization and phase transformation of mesoporous ZrO 2 fibers were investigated by X-ray diffraction. N 2 adsorption-desorption studies were conducted to investigate the changes in the porous structure of the ZrO 2 fibers heat-treated at different temperatures. Scanning electron microscopy confirmed the mesoporous structure of the ZrO 2 fibers. The oxide-added ZrO 2 fibers heat-treated in the presence of water vapour exhibited a mesoporous structure with increased surface areas and thermal stability. The related reinforcing mechanisms were proposed. It was deduced that water vapour promoted the removal of the soft template, leading to the formation of a mesoporous structure with a high surface area. Meanwhile, the increase in the surface areas of mesoporous ZrO 2 fibers with the incorporation of the oxide additive was mainly due to the enhanced thermal stability of the porous walls. The relationship between the mesoporous structure stability and the zirconia phase stability was fully discussed. This work provides a new route for enhancing the surface areas and structure thermal stability of mesoporous ZrO 2 fibers.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 21
·16532-16539
·
IF 4.6
Rui Liang,Yu Hu,YuFang Ye,Qing Wang
In this study, a new type of composite was synthesized via the sol–gel method. The structure and properties of the composite were analyzed using X-ray diffraction, scanning electron microscopy, nitrogen isothermal adsorption and desorption tests, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. Characterization results showed that phosphotungstic acid (PW12) was successfully loaded on zirconium dioxide (ZrO2). The oxidative desulfurization performance of 500 ppm dibenzothiophene (DBT) was studied with H2O2 as the oxidant and xPW12/ZrO2 as the catalyst. Under optimal conditions (T = 60 °C, O/S = 2 and m = 0.03 g), the desulfurization rate reached 97.85% within 20 min, and the activity did not decrease significantly after 8 cycles. The kinetics of the reaction was studied at different temperatures. Results showed that the oxidation rate conforms to quasi-first-order kinetics and the apparent activation energy is 23.32 kJ mol−1. Therefore, the composite material is expected to be a catalyst for oxidative desulfurization.
研究领域:
化学工程
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催化材料
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 15
·7395-7404
·
IF 11.301
Qiuyan Duan,Chenghua Zhang,Song Sun,Yang Pan,Xiong Zhou,Yang Liu,Kun Chen,Cunshuo Li,Xianzhou Wang,Wenzhi Li
Lean methane combustion through efficient catalysis is an intensely important way to reduce environmental pollution. Notably, palladium-based catalysts are promising catalytic materials. The small size of palladium particles is a crucial factor to improve the catalytic activity. In this study, we proposed a new pathway to minimize the size of palladium particles for palladium-based catalysts from the perspective of material preparation. We first built double spatial barriers on the interface between the support and the active species to prepare atomically dispersed palladium species catalysts. To be specific, organo-silane was employed as a surfactant to modify the zirconia support and palladium acetate was selected as the palladium precursor, taking advantage of the spatial structure of alkane chains combined with silicon atoms and palladium acetate in toluene. Under a lean methane reaction environment, 0.23 wt% atomically dispersed palladium species deposited on decorated zirconia (donated as 0.23 wt% Pd/SiO2–ZrO2) displayed high catalytic activity with 100% conversion at a temperature of around 400 °C with gas hourly space velocity (GHSV) of 30 000 ml g−1 h−1, higher than that of pristine zirconia loaded with 0.23 wt% palladium nanoparticles (donated as 0.23 wt% Pd/ZrO2), which removed all lean methane at around 600 °C under the same conditions. As the palladium loading increased on the modified support, the 1.38 wt% Pd/SiO2–ZrO2 catalyst had a comparable catalytic activity and fully converted lean methane at around 330 °C. The lean methane combustion reaction pathway for the 0.23 wt% Pd/SiO2–ZrO2 catalyst was investigated by in situ NAP-XPS and in situ DRIFTS. Hydroxyl groups formed during the reaction were transferred to the silica, which could reduce the formation of the inactive Pd(OH)x species and expose more active sites to improve the catalytic activity. It is hoped that this study will provide a novel method to improve the utilization of palladium species in practical applications.
研究领域:
催化化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Haiqiang Lin,Hongyan Qu,Weikun Chen,Kang Xu,Jianwei Zheng,Xinping Duan,Hesheng Zhai,Youzhu Yuan
In gas-phase chemoselective hydrogenation of crotonaldehyde on Ag-based catalysts, zirconia doping on silica supports was found to improve catalytic performance in terms of unsaturated alcohol selectivity, hydrogenation activity, and stability. The surface modification of silica by zirconia doping favors the fine dispersion of Ag species due to the enhanced quantity and strength of surface acid sites, which enable construction of abundant catalytic sites effective for C O bond hydrogenation. High crotyl alcohol selectivity, exceeding 80%, and significant inhibition of monohydrogenation on the C C bond were observed on the optimal Ag/Zr–SiO 2 catalyst. Dynamic O 2 chemisorption measurement revealed that the pure Ag powders did not chemisorb O 2 irreversibly under 323 K, but SiO 2 or Zr–SiO 2 supported Ag catalysts did. The amounts of Ag active for O 2 chemisorption, which are at least one order of magnitude lower than that of surface Ag derived from TEM and XRD characterizations, match well with the perimeter interface Ag of hemispherical particles. A strong correlation between hydrogenation activity and O 2 uptake on those Ag/SiO 2 and Ag/Zr–SiO 2 catalysts with different Ag dispersions and deactivation degrees was observed, implying that the effective catalytic sites for crotonaldehyde chemoselective hydrogenation may originate from accessible interface sites with unique redox properties. Catalyst induction and deactivation were observed on both Ag/SiO 2 and Ag/Zr–SiO 2 catalysts in real catalytic operation. Changes in metal stable interface structure, rather than metal aggregation and coagulation, are assumed to be the main cause of irreversible catalyst deactivation, because the apparent Ag particle sizes changed slightly, but the oxygen chemisorption ability deteriorated considerably. Electropositive Ag sites interacting with neighboring oxygen from oxide supports at the ternary Ag–ZrO 2 –SiO 2 interface are proposed to account for highly selective C O bond hydrogenation to produce the desired unsaturated alcohol.
研究领域:
化学工程
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催化科学
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产品关联
DOI
高影响因子
Sustainable Energy & Fuels
·
2018
·Vol. 2
·期 11
·2412-2418
·
IF 0
Qifei Wang,Shuang Liu,Yue Ming,Yanjun Guan,Daiyu Li,Congcong Zhang,Zhaokui Wang,Yaoguang Rong,Yue Hu,Hongwei Han
Printable mesoscopic perovskite solar cells based on TiO2/ZrO2/carbon mesoporous scaffolds have a promising future in commercialization due to their stability and ease of large-scale manufacturing, in which the mesoporous ZrO2 (mp-ZrO2) spacer is crucial in decreasing charge carrier recombination. To obtain high-performance devices, 2–3 μm thick mp-ZrO2 is usually needed. However, such thickness leads to an increased loading amount of perovskite material and causes problems such as reproducibility, pollution, and waste. Herein, we provide a universal solution to enhance VOC in printable mesoscopic PSCs with thin mp-ZrO2 layers. By depositing a thin layer of Al2O3 using a spraying pyrolysis method, we successfully retard the recombination between the TiO2 and carbon electrode. We further find the modification could down-shift the conduction band minimum (CBM) and increase the carrier transportation. Finally, we successfully reduce the mp-ZrO2 thickness of devices from 3 μm to 1.2 μm while retaining comparable device performance. Thanks to thinner ZrO2 layers, the usage of solvent and PbI2 is also reduced, which makes the device both more cost-efficient and environmentally friendly. This modification strategy will pave the way to the commercialization of printable mesoscopic PSCs with greener and cheaper processes.
研究领域:
材料科学
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能源技术
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环境科学
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产品关联
DOI
Crystals
·
2023
·Vol. 13
·期 3
·460
·
IF 2.7
Danni Huang,Tong Xiao,Beibei Fu,Shoulei Xu,Yuyang Huang,Wen Deng,Zhukun Zhou
ZrO2is an attractive host matrix for luminescence material because of its excellent physical properties, such as low phonon energy and wide band gap. In this work, the highly transparent Tm2O3and Yb2O3co-doped yttria stabilized zirconia (YSZ) (abbreviated as Yb/Tm: YSZ) single crystals were grown by the optical floating zone method. The Yb/Tm: YSZ samples were stabilized in the cubic phase at room temperature when Yb3+and Tm3+replaced Y3+. The influence of Yb3+co-doping on the up-conversion luminescence properties of the crystals was systematically studied. A total of 0.5 mol% Tm2O3and 2.0 mol% Yb2O3co-activated YSZ single crystal (abbreviated as 2.0Yb/Tm: YSZ) has the maximum luminous intensity. There were seven absorption peaks located at around 358, 460, 679, 783.3, 850–1000, 1200, and 1721.5 nm that were observed in the absorption spectrum of the 2.0Yb/Tm: YSZ single crystal. There were three up-conversion peaks at around 488, 658 and 800 nm that were observed when the Yb/Tm: YSZ samples were excitated at 980 nm. The fluorescence lifetime of Tm3+for the1G4→3H6transition of the 2.0Yb/Tm: YSZ sample is 7.716 ms as excited with a 980 nm laser. In addition, the oscillator strength parameters Ωλ(λ = 2, 4 and 6) of this sample were derived by the Judd–Ofelt theory to evaluate the laser performance of the host materials. The ratio Ω4/Ω6of this sample is 0.80, implying its excellent laser output. Therefore, the 2.0Yb/Tm: YSZ single crystal is a considerable potential material for laser and luminescence applications.Keywords:YSZ single crystal;Yb3+and Tm3+co-activated;optical floating zone method;up-conversion luminescence;Judd–Ofelt theory
研究领域:
材料科学
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光学
·
激光物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）