JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2018
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IF 3.794
Lan Wang,Xiaoyan Shu,Facheng Yi,Dadong Shao,Kuibao Zhang,Haibin Zhang,Xirui Lu
A series of Nd and Ce co-doped Gd 2- x Nd x Zr 2- y Ce y O 7 (0.0 ≤ x , y ≤ 2.0) ceramics were rapidly fabricated through spark plasma sintering (SPS) within 3 min. The effects of Nd and Ce contents on the phase composition, lattice parameter , active modes, microtopography and microstructure have been investigated in detail. XRD studies reveal that the compositions corresponding to 0.0 ≤ y ≤ 1.0 show a single phase and beyond 1.0 exhibit multiphase. The lattice parameters increase with elevated Nd and Ce content. The grains are densely packed on each other with cube-like shape, and the elements are almost homogeneously distributed in the compound. This synthetic method provides a simple pathway for the preparation of highly densified single phase ceramic at 1600–1700 ℃ for 3 min under pressure of 80 MPa.
研究领域:
材料科学
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2021
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IF 3.927
Nan Qing Yang,Jin Li,Ya Nan Wang,Jie Ma
In this study, Fe and Ce co-doped ZnO (Zn 1-2x Fe x Ce x O, x = 0, 0.01, 0.03, 0.04) was prepared through hydrothermal synthesis , followed by annealing. The samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, UV–vis spectroscopy, and photoluminescence spectroscopy, and the photocatalytic efficiency of the samples on the organic dye, methylene blue, under simulated sunlight was studied. Based on first principles, the influence of doping on the band structure of the samples was studied. The experimental results show that co-doping ratios affect the performance of ZnO. When the doping concentration was 3 at%, the red shift of the UV–vis spectrum of the material was the most obvious, and the PL of the material was inhibited. Compared with pure ZnO, the degradation rate increased from 72.6% to 98.5%. As the doping concentration increased, the photocatalytic performance of the materials began to decrease. Simulations showed that the incorporation of small amounts of Fe and Ce reduced the band gap of ZnO and introduced a shallow donor level in the band gap, effectively inhibiting the recombination of carriers, thereby improving the photocatalytic performance of the material. When the doping ratio was increased from 3% to 4%, the band gap became wider. These results indicate that Fe and Ce co-doped ZnO has potential applications in the photocatalytic degradation of organic pollutants and provides a method for improving photocatalytic performance by inhibiting carrier recombination.
研究领域:
材料科学
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环境科学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
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2017
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IF 1.871
Ke Yang,Weiwei Xiao,Quan Xu,Jiaojiao Bai,Yan Luo,Hao Guo,Li Cao,Wei Cai,Peng Pu,Lulu Cai
Typical p-type semiconductor MnO codoped with n-type semiconductors such as CeO2 and V2O5 was reported to achieve high efficiency in catalytic NO removal by NH3. In this paper, we present novel Mn-Ce codoped V2O5/TiO2 catalyst which exhibited an excellent NO conversion efficiency of 90% at 140°C. By using this codoped catalyst, the best low-temperature activity was greatly decreased when compared with single Mn- or Ce-doped catalyst. According to the characterization results from BET, XRD, and XPS, the codoped catalyst was composed of both CeO2 and amorphous Mn. The electron circulation formed between doping elements is believed to promote the electron transfer, which may be one of the reasons for excellent low-temperature denitration performance.
研究领域:
环境科学
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催化化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
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2024
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IF 6.3
Huijiao Wang,Siyuan Xue,Weiyi Wang,Fan Gao,Shizuo Yi,Jiayin Li,Yuxin Yang,Erzhuo Zhao,Jianchao Wang,Jianbing Wang
In this study, an efficient Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 electrode was fabricated for triclosan electro-oxidation by co-doping the transition metal Ce and carbon nanotubes (CNTs) into the PbO 2 active layer . Characterization results show that the co-doped Ce and CNTs present a synergistic effect on covering the obvious cracks on the Ti/SnO 2 -Sb 2 O 3 surface, decreasing the PbO 2 crystal size, increasing the electrode oxygen evolution potential from 1.60 to 2.17 V vs SCE, and reducing the charge transfer resistance by 66 %. Consequently, Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 was the most effective and energy-efficient electrode for hydroxyl radical (•OH) generation and triclosan electro-oxidation in this study. Compared with other two electrodes (Ti/SnO 2 -Sb 2 O 3 and Ti/SnO 2 -Sb 2 O 3 /Ce-PbO 2 ), triclosan removal by Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 was accelerated by 1.8–2.6 times, with the energy demand for abating 90 % triclosan (E EO ) decreased by 49 % – 67 %. Furthermore, triclosan degradation pathways were proposed based on density functional theory (DFT) calculation and transformation product (TP) identification, with •OH addition at C14 and C11 sites being the most favorable pathway. In addition, the estimated acute and chronic toxicities of TPs were generally decreased than their mother compound. Therefore, the results of this study suggest the feasibility and effectiveness of the Ti/SnO 2 -Sb 2 O 3 /CNT-Ce-PbO 2 electrode for triclosan electro-oxidation.
研究领域:
环境科学
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材料科学
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电化学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2017
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IF 2.986
Jin Wang,Junxia Wang,Yibing Zhang,Yuxiang Li,Yuancheng Teng,Zhe Wang,Hongbin Tan
A series of Nd and Ce co-doped (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 (0 ≤ x ≤ 1) pyrochlores were synthesized by flux method at 900–1000 °C using nitrates as starting materials and a small amount of NaF as fluxing agent . The influences of contents of Nd/Ce, fluxing agent and reaction temperature on the phase structure of the pyrochlores were systematically investigated by X-ray diffraction (XRD) and Raman spectroscopy (Raman). The chemical stability of Nd and Ce co-doped pyrochlore bulk ceramics was also evaluated. XRD and Raman results showed that the crystalline phase of (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 (0 ≤ x ≤ 1) pyrochlores always remained a single disordered defect-fluorite structure for any x value. XRD, Raman spectrum and SEM-EDX results revealed that the Nd and Ce could be co-doped at the Gd-site and Zr-site of the Gd 2 Zr 2 O 7 pyrochlore structure, respectively. The normalized release rates of Gd, Zr, Nd and Ce in (Gd 1−x Nd x ) 2 (Zr 1−x Ce x ) 2 O 7 pyrochlore bulk ceramics (x = 0.25, 0.5 and 0.75) remained relatively constant in a low value below 10 −4 g m −2 d −1 at 90 °C for 7 days, exhibiting superior chemical stability.
研究领域:
材料科学
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核废料管理
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Rong Hu,Gui-Xin Guo,Jun-An Chen,Qing Li
The development of dual-mode biosensors for the accurate detection of acid phosphatase (ACP) activity and the screening of its inhibitors is of vital importance in clinical diagnostics and environmental monitoring. In this work, we report the synthesis of Mn–Ce co-doped carbon dots (Mn&Ce@CDs) exhibiting both oxidase-mimetic catalytic activity and intrinsic fluorescence. The nanozymes efficiently catalyze the oxidation of colorless o -phenylenediamine (OPD) to produce a yellow chromogen, 2,3-diaminophenazine (DAP), characterized by a distinct absorption peak. Significantly, the excitation spectrum of DAP overlaps with the emission wavelength of Mn&Ce@CDs, resulting in an inner filter effect (IFE) that quenches the blue fluorescence of the carbon dots while simultaneously enhancing DAP's emission. This mechanism establishes a robust ratiometric fluorescence signal. The enzymatic hydrolysis of ascorbyl-2-phosphate by ACP yields ascorbic acid, which inhibits the nanozyme-catalyzed oxidation of OPD. Consequently, this leads to a decrease in DAP formation, diminishing both its characteristic absorption and the IFE-induced fluorescence quenching, thus producing a dual-signal response. Quantitative ACP detection exhibited a linear range of 0.5–15 U/L with limits of detection of 0.037 U/L in fluorescence mode and 0.49 U/L in colorimetric mode. The platform demonstrated high selectivity and reliability, showing recovery rates of 97.7–109.3 % (fluorescence) and 97.9–107.5 % (colorimetric) in spiked serum samples. Additionally, smartphone-based RGB analysis enables rapid on-site detection. The system was successfully applied for screening ACP inhibitors, with chlorpyrifos exhibiting IC 50 values of 50.45 μg/mL (fluorescence) and 43.77 μg/mL (colorimetric). This integrated dual-mode approach offers a powerful, reliable tool for clinical diagnostics and environmental assessment.
研究领域:
生物传感器
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纳米技术
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酶活性检测
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环境监测
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临床诊断
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荧光光谱学
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纳米酶
✓ 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）