JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 13
·136506
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IF 3.721
Minghui Xu,Valeri Smolenski,Qi Liu,Alena Novoselova,Kewei Jiang,Jing Yu,Jingyuan Liu,Rongrong Chen,Hongsen Zhang,Milin Zhang,Jun Wang
The purpose of this work is to study the electrochemical behavior of uranium and cerium in fused In/3LiCl-2KCl system in the temperature range of 723–823 K by open-circuit potentiometry. The apparent electrode potential of Ce3+/Ce (U4+/U) couples and apparent standard potential of Ce-In (U-In) alloys vs AgCl/Ag reference electrode were established. The principal thermodynamic properties, activity and solubility of cerium and uranium were determined. The separation factor of uranium/cerium couple on liquid indium electrode was calculated. The experimental results have been shown that a lower temperature should be more effective for the separation uranium from cerium.
研究领域:
冶金学
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电化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Yu-Feng Sun,Jing-Jing Li,Feng Xie,Yan Wei,Meng Yang
Metal oxides nanomaterials are limited in electrochemical detection of heavy metal ions (HMIs) because of their poor conductivity and less active sites, which hinders electron transport and reduce the redox rate of HMIs, making it difficult to achieve sensitive and accurate detection of trace pollutions. Herein, Ru-loaded cerium dioxide nanocubes (Ru/CeO 2 ) with rich oxygen vacancies (OVs) was developed to construct electrochemical sensing interface. An unexpected sensitivity of up to 2169.8 μA μM −1 cm -2 was obtained with a detection limit of 0.019 μM in the detection of Hg(II). The predominantly exposed highly active (100) crystal facets and abundant OVs on the surface of CeO 2 nanocubes, as well as Ru nanoparticles with excellent metal activity, providing large amounts of reactive oxygen species and active sites, thereby enhancing the conductivity and adsorption capacity of the nanocomposites. Ultimately, the outstanding electrochemical signal was achieved by promoting the redox reaction of Hg(II). In addition, the proposed method shows the excellent stability and high anti-interference ability, and the accurate analysis of Hg(II) in real water samples was realized. This finding provides a good strategy for the development of nano-metal oxide with OVs for the reliable determination of trace heavy metal substance.
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
Asia-Pacific Journal of Chemical Engineering
·
2012
·Vol. 7
·期 6
·940-947
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IF 0.758
Jianxian Zeng,Qincheng He,Hu Zhou,Xiahui Sun,Jiaojiao Zhang
Complexation–ultrafiltration process was investigated for cerium(III) recovery from aqueous solutions by using poly (acrylic acid) sodium salt (PAASS) as a complexing agent. The adsorption of cerium(III) on PAASS was preliminarily studied at different pH values. Next, effects of pH, polymer metal ratio (PMR), calcium(II) and competitive complexing agents on permeate flux ( J ) and cerium rejection coefficient ( R ) were investigated in the total recirculation mode. Finally, the integrations of four experiments including concentration, decomplexation, regeneration of PAASS and reuse of regenerated PAASS were carried out. Obtained results show that the adsorption can be described well using the Langmuir equation. If pH is reduced below 4, J decreases rapidly. PMR has negligible effect on J . R increases with increasing pH or PMR. Calcium(II) and ethylenediaminetetraacetic acid disodium salt have the effects on R , but these effects can decrease by increasing pH. Tartrate sodium does not influence R . In the process of concentration, J declines slowly, and R is about 1. It takes 40 min to reach the decomplexation equilibrium at pH 3. The decomplexation percentage of cerium(III)–PAASS complex is about 70%. In the regeneration of PAASS, cerium(III) can be removed effectively, and the purification of regenerated PAASS is acceptably satisfactory. The binding capacity of regenerated PAASS is close to that of fresh PAASS, and the recovery percentage of binding capacity is higher than 90%. © 2012 Curtin University of Technology and John Wiley & Sons, Ltd.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2015
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IF 2.947
Xiaoyan Shu,Long Fan,Xirui Lu,Yi Xie,Yi Ding
A series of pyrochlore structure oxides (Gd 1− x Nd x ) 2 (Zr 1− y Ce y ) 2 O 7 (0 ≤ x , y ≤ 1.0) were fabricated and investigated. The end member of A-site substitution (Nd 2 Zr 2 O 7 ) maintains the original pyrochlore phase, while the ultimate compositions of B-site and simultaneous substitution have transformed to a single defect fluorite structure from the XRD results. The Raman spectra reveal the local coordination changes resulting from exotic-atom substitutions, especially from the B-site substitution. The microtopography and element distribution of the ultimate composition Nd 2 Ce 2 O 7 in the discussed system are characterized through SEM and TEM. The density and Vickers hardness of the compounds are provided for the basic mechanical performance evaluation.
研究领域:
材料科学
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物理学
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DOI
高影响因子
BIOLOGICAL TRACE ELEMENT RESEARCH
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2016
·Vol. 175
·期 2
·298-305
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IF 1.798
Li Yan,Yu Hua,Li Peng,Bian Ying
In order to assess occupational exposure level of 15 rare earth elements (REEs) and identify the associated influence, we used inductively coupled plasma mass spectrometry (ICP-MS) based on closed-vessel microwave-assisted wet digestion procedure to determinate the concentration of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu in urinary samples obtained from workers producing ultrafine and nanoparticles containing cerium and lanthanum oxide. The results suggest that La and Ce were the primary component, together accounting for 97 % of total REEs in workers. The urinary levels of La, and Ce among the workers (6.36, 15.32 μg.g −1 creatinine, respectively) were significantly enriched compared to those levels measured in the control subjects (1.52, 4.04 μg.g −1 creatinine, respectively) ( p < 0.05). This study simultaneously identified the associated individual factors, the results indicate that the concentrations in over 5 years group (11.64 ± 10.93 for La, 27.83 ± 24.38 for Ce) were significantly elevated compared to 1–5 years group (2.58 ± 1.51 for La, 6.87 ± 3.90 for Ce) ( p < 0.05). Compared the urinary levels of La and Ce at the separation and packaging locations (9.10 ± 9.51 for La, 22.29 ± 21.01 for Ce) with the other locations (2.85 ± 0.98 for La, 6.37 ± 2.12 for Ce), the results show urinary concentrations were significantly higher in workers at separation and packaging locations ( p < 0.01). Inter-individual variation in levels of La and Ce in urine is the result of multi-factorial comprehensive action. Further researches should focus on the multiple factors contributing to the REEs levels of the occupationally exposed workers.
研究领域:
职业健康
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分析化学
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环境医学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
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2021
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IF 8.071
Qing Yang,Yongqiang Liu,Lihong Wang,Qing Zhou,Mengzhu Cheng,Jiahong Zhou,Xiaohua Huang
Aggravating the pollution of microcystins (MCs) in freshwater environments is detrimental to aquatic living organisms and humans, and thus threatens the stability of ecosystems. Some environmental factors have been verified to promote the production of MCs in Microcystis aeruginosa , thereby aggravating the pollution of MCs. However, the effects of cerium (Ce), the most abundant rare earth element in global water environments, on the production of MCs in M. aeruginosa are unknown. Here, Lake Taihu water was selected as a representative of freshwater environments. By using interdisciplinary methods, it was found that: (1) the exposure level of Ce [Ce(III) and Ce(IV)] in Lake Taihu water is in the range of 0.271–0.282 μg/L; (2) Ce exposure in Lake Taihu water promoted the contents of three main MCs (MC-LR, MC-LW and MC-YR) in M. aeruginosa and water; (3) a cellular mechanism of Ce promoting the production of MCs in M. aeruginosa in Lake Taihu water was suggested: Ce enhanced endocytosis in cells of M. aeruginosa to promote the essential element uptake by M. aeruginosa for MC synthesis. Thus, Ce exposure in Lake Taihu water aggravates the pollution of MCs via enhancing endocytosis in cells of M. aeruginosa . The results provide reference for assessing the environmental risk of Ce in water environments, investigating the mechanism of the pollution of MCs induced by environmental factors, and developing strategies aimed at preventing and controlling the pollution of MCs.
研究领域:
环境科学
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生物学
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DOI
PubMed
高影响因子
Science China-Materials
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2020
·Vol. 63
·期 9
·1731-1740
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IF 6.098
Zhan Changhong,Yu Zijia,Liu Zheng,Chen Yong,Chen Delun,Tu Jinchun,Wu Qiang,Zhang Xiaolin,Cao Yang
As a half-reaction to obtain high-efficiency and stable water-splitting, oxygen evolution reaction (OER) is a slow-kinetics process involving a four-electron (4e - ) transfer process and therefore requires catalysts to fasten electron transfer. Here, we rationally optimized an interface material of ceria nanoparticles and nickel hydroxide by adsorbing ethylene glycol (EG-Ni(OH) 2 @CeO 2 ), which produced ultrasmall nanosheets uniformly attached onto carbon cloth substrate. According to the characterization and density functional theory (DFT), the ethylene glycol-induced nickel-cerium interface had strong electron interaction, generating numerous of Ni (3-δ)+ active sites, reducing the energy reaction barrier, and promoting the electron-transport kinetics in the catalytic system. EG-Ni(OH) 2 @CeO 2 showed excellent OER performance, with a low overpotential (335 mV) at 50 mA cm -2 and a small Tafel slope (67.4 mV dec -1 ). And the EG-Ni(OH) 2 @CeO 2 also maintained stable for up to 60 h at 10, 20, and 30 mA cm -2 . Overall, this research shows the significance of the interface engineering of metal materials based on organic-solvent adsorption to improve the electrocatalytic OER process.
研究领域:
材料科学
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电化学
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催化化学
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纳米材料
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能源化学
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表面科学
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物理化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Lulu Cui,Weijie Shi,Houshen Li,Xiuxian Zhao,Shiyun Ai,Xiangju Meng,Shuhong Sun,Zeyi Guo
For bimetallic nanozymes, the closeness between the two elements is closely related to their properties, but achieving tight contact between the two components still faces challenges. Herein, copper was introduced by the coordination effect between the organic ligand in Ce-MOF and Cu 2+ , then a series of Cu-CeO 2 nanozymes were obtained by thermal treatment. The content of copper can be easily controlled and the spindle-shaped structure assembled by multilayer flakes can be obtained. The total antioxidant capacity (TAC) detection program based on the excellent peroxidase (POD)-like activity of the as-prepared Cu-CeO 2 nanozyme showed a wide linear detection range and ideal detection limits for ascorbic acid (AA), glutathione (GSH), Trolox and cysteine (Cys). More importantly, this method can be applied in TAC detection of commercial samples. This work provided a method for the design of high performance bimetallic nanozymes and developed a sensor that can be applied to detect TAC in vitamin C tablets and beverages.
研究领域:
材料科学
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生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
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2012
·
IF 0
Si Hui Wang,He Yun Wang,Fan Xing Meng,Ya Li Li
Abstract: The introduction of metal atoms into SiBCN network allows the development of novel high temperature ceramics and functional ceramics. In this work, cerium (Ce) containing polyborosilazane (PBSZ) is synthesized through substitution and polymerization reactions. Ce atoms are incorporated into PBSZ through the lithium replacement of H in PBSZ followed by Ce replacement of lithium. The chemical structure of the PBSZ and as-synthesized Li containing PBSZ are analyzed by Fourier transform infrared (FTIR) shows that the bands at 598 and 1183 cm-1 which can be assigned to Li-N and Si-N-Li stretching. It is suggested that lithium is incorporated into PBSZ. PBSZCe is transformed into SiBCNCe ceramic by pyrolysed in argon. Scanning electron microscope shows that the SiBCNCe ceramics are porous on the surface and corallike in the section. The chemical bondings of SiBCNCe ceramics are BN, the BN, SiC and Si3N4 characterized by X-ray photoelectron spectroscopy.
研究领域:
材料科学
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无机化学
✓ 已验证
DOI
FUEL
·
2017
·
IF 4.601
Dongjing Liu,Weiguo Zhou,Jiang Wu
CuO-based and MnO x -based sorbents modified with Ce and La using sol-gel method, were employed for elemental mercury removal at 120–240 °C. The Hg 0 removal activity of Mn 2 O 3 /ZSM-5 can be significantly enhanced by doping 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency increased by 94% and 71%, respectively. The Hg 0 removal ability of CuO/ZSM-5 subtly improved by addition of 50 at.% Ce or 10 at.% La, the Hg 0 removal efficiency ascended only by 6% and 18%, respectively. The XPS results revealed that Hg 0 transformed to HgO, and CuO (or Mn 2 O 3 ) was reduced to Cu 2 O (or Mn 3 O 4 ), which is in agreement with Mars-Maessen mechanism.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Linxin Zheng,Ningchao Zheng,Zhizeng Pan,Guang Gao,Chao He,Xinran Mou,Xiangbiao Yin,Shunyan Ning,Mohammed F. Hamza,Yuezhou Wei
Efficient recovery of uranium from wastewater and seawater provides an important guarantee for the sustainable growth of nuclear energy. Herein, we skillfully use the alkali etching method to construct CeO 2 hollow spheres rich in Ce–OH groups for the removal and recovery of uranium from water matrixes. It is found that the CeO 2 exhibits fast adsorption kinetics (equilibrium time within 10 min) and moderate adsorption capacity (143.1 mg/g), and the removal efficiency of low concentration uranium (0.1 g/L and 1 g/L) reaches 100% within 1 min of adsorption. Moreover, the adsorption of uranium by CeO 2 is almost unaffected by common anions and cations in the environment, even if the concentration of anions is 1000 times that of uranium. More importantly, the CeO 2 can enrich uranium concentration in seawater by 167.9 times and the recovery rate reaches 83.9%. Mechanistic studies reveal that the adsorption of uranium by CeO 2 is mainly attributed to the rich Ce–OH groups on the surface of CeO 2 , resulting in the rapid adsorption of U(VI) and mainly forms a single-bridge model. The findings of this study provide a green and efficient path for the removal and recovery of uranium from wastewater and seawater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jingjing Wang,Jinchuan Zhao,Zhihui Wen,Xinjie Wei,Junjie Liao,Liping Chang,Kechang Xie
CeY zeolite sorbent was reported to have a high adsorptive desulfurization selectivity for thiophene. However, only the cerium in the supercage, which is larger than the thiophene molecule, is effective for thiophene adsorption. In this case, regulating the cerium location to anchor it more in the surpercage of Y zeolite is an important issue. Herein, the glycine was used as a complexing agent with cerium to control its size, ensuring that the cerium precursor is in the supercage. G 0.1 CeY were prepared by ion exchange technique with glycine and cerium coordination from NaY. The adsorption capacity of sorbents was measured, and their physical and chemical properties were characterized by XRD, SEM, N 2 adsorption/desorption, NH 3 -TPD, and in situ FT − IR. The glycine complexation could effectively control the location of Ce, so that the G 0.1 CeY has the highest content of Ce located in the supercage. Moreover, in order to further explore the influence of zeolite type, HY was used as the raw material to prepared G 0.1 CeHY in the same way. G 0.1 CeHY has a higher desulfurization performance than that of G 0.1 CeY, whereas the Ce content in its supercage is lower. The NH 3 -TPD and Py-FT − IR results that the medium-strong Brønsted acid of the G 0.1 CeHY sorbent is also effectively for the improvement of desulfurization efficiency. The G 0.1 CeHY exhibits the hightest desulfurization effectiveness (51 %) and the highest breakthrough adsorption capacity of 5.42 mg/g.
研究领域:
化学工程
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材料科学
✓ 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）