SOLID STATE COMMUNICATIONS
·
2015
·
IF 1.897
Lina Liu,Ruirui Sun,Yongsheng Zhang,Ruifei Qin,Dongmei Zhang,Chunjuan Tang,Linfeng Chen,Lishuang Liu
LaF 3 :Ce,Tb@SiO 2 core-shell nanostructures were synthesized using a new one-pot reverse microemulsion strategy. One-pot method facilitates the synthetic process of this kind of core-shell nanostructures. The crystalline phase, size, morphology, pore structure and luminescence properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), nitrogen physisorption isotherm, photoluminescence (PL) excitation and emission spectra. The results revealed that the core-shell nanostructures have an average diameter of about 27 nm and cores of about 3 nm, and that these nanostructures contain micropores with an average pore diameter of 0.43 nm. The characteristic emissions of Tb 3+ were observed under the excitation of Ce 3+ 4f–5d transition due to the energy transfer from Ce 3+ to Tb 3+ . LaF 3 :Ce,Tb@SiO 2 nanostructures can disperse well in water and the colloid can emit bright green light under ultraviolet (UV) irradiation.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Mei Li,Zhixiang Shan,Rugeng Liu,Meng Zhang,Wei Han
The electrochemical investigation of Ce(III) was carried out on W, Sn film and liquid Sn electrodes in LiF-LiCl eutectic by a variety of electrochemical methods. It was determined that Ce(III) was reduced to metallic Ce on W electrode via a one-step three-electron transfer, which was a reversible process controlled by diffusion. The diffusion coefficient of Ce(Ⅲ) in LiF-LiCl eutectic was estimated by CV and CP, while the diffusion activation energy was calculated to be 20.86 kJ mol −1 and 20.95 kJ mol −1 , respectively. The electrochemical behavior of Ce(Ⅲ) was studied on Sn film electrode by CV and OCP. Eight alloy compounds Ce x Sn were obtained due to the underpotential deposition of Ce on the pre-deposited Sn film electrode. The activities of Ce in Ce x Sn and standard Gibbs formation energies of Ce x Sn were evaluated, respectively. Moreover, on Sn film electrode, the electrochemical extraction of Ce was performed at −1.5 V. XRD, SEM and EDS results exhibited the formation of CeSn 3 and Ce 2 Sn 5 . On liquid Sn electrode, the reduction current of Ce appeared at about −1.2 V and reached a peak at about −1.4 V. The electrochemical extracting Ce was also conducted on liquid Sn electrode at −1.3 V and CeSn 3 was obtained. The extraction rates and efficiencies of Ce on liquid Sn electrode were estimated using ICP-AES at different durations. It was found that as the extraction proceeded, the extraction rate decreased, while the extraction efficiency increased. The extraction efficiency reached over 98 % after electrolysis for 10 h.
研究领域:
冶金学
·
电化学
✓ 已验证
DOI
高影响因子
Processes
·
2022
·Vol. 10
·期 10
·1946
·
IF 3.352
Hong Shen,Zijun Tang,Xiang Xiao,Haiwen Wu,Hang Zhou,Ping Fang,Dingfang Zhu,Jianhua Ge
In this study, Mn-Ce/Al2O3/TiO2catalyst prepared by impregnation method was used for synergistic O3oxidation NO. The catalyst prepared by impregnating Al2O3/TiO2at a Mn:Ce molar ratio of 4:1 showed the best catalytic activity. The catalyst performance showed that when the molar ratio of Mn:Ce was 4:1 and the volume ratio of O3:NO was 1:4, the removal rate of NO could reach 63%, which could increase the removal rate by 40% compared with that of NO oxidized by O3alone. BET, XRD, and TEM characterization results showed that when the molar ratio of Mn:Ce was 4:1, the catalyst specific surface area, and pore capacity were the largest. A large amount of MnOx and CeOx were distributed on the catalyst surface. The XPS analysis showed that the oxidation-reduction and oxygen vacancy of Mn (IV)/Mn (III)/Mn (II) and Ce (IV)/Ce (III), had a synergistic effect on the decomposition of O3into reactive oxygen species(O*), thus improving the catalytic capacity of Mn-Ce/Al2O3/TiO2catalyst for O3. The O2-TPD analysis showed that the oxygen vacancies and oxygen species in the catalyst could be used as the active point of decomposition of O3into O*. The experimental results show that the prepared catalyst can significantly improve the efficiency of ozone oxidation of NO and reduce the amount of ozone. The catalyst can be applied to ozone oxidation denitrification technology.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2019
·
IF 0.486
Tianyi Xia,Jie Zhao,Peisong Tang,Liangyun Sun,Bingqi Pan
Using zinc acetate, cerium acetate and glycerol as main raw materials, the Ce doped ZnO (Ce/ZnO) with molar doping ratio of 0.1%, 0.5%, 1.0%, 2.0% and 3.0% were prepared by hydrothermal method at 200 °C. The structure and morphology of prepared Ce/ZnO were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), electron spectroscopy (EDS) and diffuse reflectance spectroscopy (DRS). The visible-light photocatalytic activity of prepared Ce/ZnO was investigated by methyl orange which was used as simulated sewage. The results show that the optimum doping amount of Ce/ZnO is 0.5% Ce, and the band gap width of 0.5% Ce/ZnO is red-shifted from 3.12 eV to 2.79 eV. The morphology of ZnO and Ce/ZnO are all mainly spherical particles. The average particle diameter of ZnO and Ce/ZnO are all from about 3μm to 4μm. The 0.5% Ce/ZnO show highly photocatalytic activity for the degradation of methyl orange under visible light irradiation, and the degradation of methyl orange conforms to the first order power with the apparent rate in paper 0.018 min−1.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yan Xue,Wenye Deng,Yuyu Liu,Xuelian Bai,Xianghui Chen,Pengjun Zhao,Ye Pan,Huimin Zhang,Aimin Chang,Yongxin Xie
A series of novel negative temperature coefficient (NTC) thermistor materials based on La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) ceramics were synthesized via the solid-state route. X-ray diffraction results confirmed the successful doping of Ce in the La 1- x Ce x AlO 3 crystal and the formation of a good solid solution. Scanning electron microscopy results indicated that Ce doping is beneficial for grain growth and reduces the porosity of the samples. With the increase in the Ce doping amount, the average grain size increased from 2.1793 to 10.7344 μm, and densities of the ceramics increased from 93.15% to 99.26%. The temperature vs resistance curve indicated that Ce doping reduces the resistivity of LaAlO 3 materials, while reducing the B 200/1400 value of the LaAlO 3 ceramic. For a doping amount of 0.2, the B 200/1400 value of the LaAlO 3 ceramic decreased from 18175.1 to 4897.7K, and the resistivity at 1000 °C decreased from 68971.87 to 1105.15 Ω cm. In addition, the La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) series materials exhibited good linear NTC characteristics. X-ray photoelectron spectroscopy results revealed that the resistivity of the LaAlO 3 materials decreased after Ce doping owing to the transformation between the Ce 4+ and Ce 3+ valence states，and the concentration of Ce 3+ increased with the increase in the Ce doping amount. Ce 3+ increases the concentration of oxygen vacancies , decreasing the resistance. Impedance analysis findings suggested that the resistance of the La 1- x Ce x AlO 3 (0 ＜ x ≤ 0.2) material mainly originates from the grain. These results indicate that Ce doping is an effective method to reduce the resistivity of LaAlO 3 . Consequently, La 1- x Ce x AlO 3 (0 ≤ x ≤ 0.2) is a promising material for NTC applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 3
·e4745
·
IF 3.259
Yibing Xie,Langlang Wang,Ping Ning,Xueqian Wang,Qi Wang,Yingjie Zhang,Mengyu Wang
A series of Ce modified catalysts were prepared using equivalent-volumetric ultrasonic impregnation method for AsH 3 removal. The performance of catalytic oxidation of AsH 3 under dynamic conditions was studied under different synthesis and reaction conditions. Through screening tests, the optimum catalyst was impregnated by 10 wt.% Ce (CH 3 COO) 3 precursor and subsequently calcinated at 550 °C. When the reaction temperature reached 170 °C, the Ce-HZSM-5 catalyst could maintain an oxidation efficiency of over 90% in 82 hrs. Furthermore, the chemical structure and properties of the catalyst and its catalytic oxidation mechanism with AsH 3 were analyzed using SEM-EDS, BET, XRD, XPS, H 2 -TPR and FT-IR. The results showed that Ce mainly existed on the catalyst surface in the forms of Ce 4+ and Ce 3+ . In the reaction process, the chemisorbed oxygen played a key role in the transformation between the two valence states. AsH 3 was firstly oxidized to elemental As with the participation of lattice oxygen. Then, the elemental As was partially blown into the rear part of the adsorption column along with the air flow and subsequently, de-sublimed on the column wall. Herein, the elemental As remained on the surface of Ce-HZSM-5 catalyst, which would further oxidize to As 2 O 3 . For the recovery of As, Ce-HZSM-5 proved to be a promising catalyst in AsH 3 removal. Highlights The CeO x modified HZSM-5 catalyst was used to catalytic oxidation of AsH 3 . The Ce-HZSM-5 catalyst could maintain over 90% oxidation efficiency in 82 hrs. AsH 3 was catalytic oxidized to elemental As and H 2 O on the catalyst surface and the As can be collected. The As adsorbed on the catalyst surface can be oxidized to As 2 O 3 but cannot be further oxidized to As 2 O 5 .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Electrocatalysis
·
2021
·Vol. 12
·期 4
·456-468
·
IF 2.713
Huang Dihui,Huang Xiaozhou,Chen Jinyang,Ye Ruihong,Lin Qian,Chen Sheng
This work constructed a new-type bisphenol A (BPA) electrochemical sensor on the basis of self-assembled multi-layer strategy of Ce-Zn-metal organic framework/multiwall carbon nanotube (Ce-Zn-MOF/MWCNT)–modified glassy carbon electrodes (GCE). The novel bimetallic Ce-Zn-MOF are synthesized by 1,3,5-benzenetricarboxylic acid (H 3 BTC) as the ligand via a hydrothermal approach. Bimetallic Ce-Zn-MOF with multiple catalytic sites and ultra-high specific surface area introduces traditional electrode modification materials, which improves the conductivity and catalytic ability of MWCNTs. Field emission scanning electron microscopy, transmission electron microscope and Powder X-ray diffraction were performed to analyze the Ce-Zn-MOF/MWCNTs. The electrochemical property was researched utilize differential pulse voltammetry (DPV), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). In the optimum conditions, the proposed sensor exhibited a wider dynamic linear range of BPA determination in 0.1 to 100 μmol·L −1 with a detection limit of 7.2 nmol·L −1 ( S / N = 3). This measurement of BPA was successfully used for drinking water with desirable recovery from 96.5 to 103.4%. Graphical Abstract
研究领域:
分析化学
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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
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 3
·1-11
·
IF 6.408
Qiang Yu,Yang Weixia,Zhang Xiaoshuo,Luo Xueli,Tang Wenzhi,Yue Tianli,Li Zhonghong
A nanocomposite was prepared by loading UiO-67 nanoparticles onto porous carbon materials derived from Ce-MOF (Ce-PC) for fluorescence detection of glyphosate. The probe (UiO-67/Ce-PC) exhibits fluorescence emission at 414 nm as the response signal under excitation at 310 nm. The fluorescence enhancement mode of UiO-67 reduces the background interference, and the introduction of Ce-PC provide hierarchical nanostructure and large specific surface area that can increase the contact availability and improve the pre-enrichment effect, ensuring UiO-67/Ce-PC with superior sensitivity. The abundant metal hydroxyl group (M–O-H) of UiO-67/Ce-PC could recognize phosphoryl groups (-PO 3 H 2 ) of glyphosate through ligand exchange, which synergizes with H-bonding interaction and electrostatic attraction to exhibit specificity toward glyphosate. The competitive coordination effects weaken the ligand-to-metal charge transfer (LMCT) and consequently induce the fluorescence recovery. The calibration plot of the fluorescence enhancement response of UiO-67/Ce-PC towards glyphosate was recorded in the range 0.02–30 μg mL −1 with a low limit of detection (LOD) of 0.0062 μg mL −1 , which is superior to the pure UiO-67. In addition, the sensor exhibited high selectivity and satisfactory accuracy and precision with recoveries of 92.1–105.6% and RSDs below 3.4%. This work not only presents a feasible sensor for sensitive and selective determination of glyphosate from cereal samples, but also provides a promising strategy for the design of MOF-based nanocomposites to achieve trace detection of various pollutants. Graphical abstract
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
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
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Aiyong Wang,Jiajia Ding,Mingqi Li,Peiyao Song,Zhiyuan Zhao,Yanglong Guo,Yun Guo,Li Wang,Qiguang Dai,Wangcheng Zhan
Short carbon chain alkanes, as typical volatile organic compounds (VOCs), have molecular structural stability and low molecular polarity, leading to an enormous challenge in the catalytic oxidation of propane. Although Ru-based catalysts exhibit a surprisingly high activity for the catalytic oxidation of propane to CO2 and H2O, active RuOx species are partially oxidized and sintered during the oxidation reaction, leading to a decrease in catalytic activity and significantly inhibiting their application in industrial processes. Herein, the Ru/Ce@Co catalyst is synthesized with a specific structure, in which cerium dioxide is dispersed in a thin layer on the surface of Co3O4, and Ru nanoparticles fall preferentially on cerium oxide with high dispersity. Compared with the Ru/CeO2 and Ru/Co3O4 catalysts, the Ru/Ce@Co catalyst demonstrates excellent catalytic activity and stability for the oxidation of propane, even under severe operating conditions, such as recycling reaction, high space velocity, a certain degree of moisture, and high temperature. Benefiting from this particular structure, the Ru/Ce@Co (5:95) catalyst with more Ce3+ species leads to the Ru species being anchored more firmly on the CeO2 surface with a low-valent state and has a strong potential for adsorption and activation of propane and oxygen, which is beneficial for RuOx species with high activity and stability. This work provides a novel strategy for designing high-efficiency Ru-based catalysts for the catalytic combustion of short carbon alkanes.
研究领域:
催化化学
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材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Xiaowen Wang,Dameng Gao,Xiao Liu,Xingyue He,Jian-Gong Ma,Peng Cheng
4-Nitrophenol (4-NP) is a common stuff involved in industrial production as well as a toxic pollutant which poses a threat to the environment and human health if not handled properly. Here, we have designed and synthesized two new metal-organic frameworks (MOFs), namely Ce-MOF-1 and Ce-MOF-2 with both fluorescent and electrochemical activities, which exhibite dual-mode sensing of 4-NP. The fluorescence emission spectra at 366 nm of both Ce-MOF-1 and Ce-MOF-2 displayed a significant turn-off signal affected by the competitive absorption and photoelectron transfer of 4-NP with the detection limits of 1.25 and 0.78 μM, respectively. Simutanously, in electrochemical sensing, 4-NP is irreversibly reduced to 4-hydroxylamine phenol under the catalysis of Ce-MOFs coating on electrode, which exhibit higher accuracy than fluorescence with detection limits of 0.36 and 0.41 μM, respectively, for the quantitatively sensing of 4-NP. Due to their complementary immunity to interference in electrochemical and fluorescence methods for 4-NP detection, Ce-MOFs exhibit more accurate 4-NP detection ability compared to other sensors. Finallly, both Ce-MOFs demonstrate excellent stability, reproducibility and selectivity in dual-mode sensing of 4-NP in tap water, that provides superior adaptability, reliability and accuracy compared to the traditional single-mode sensing method.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Bioactive Materials
·
2020
·
IF 8.724
Yawei Ren,Yajing Han,Zhaoyang Li,Xiangmei Liu,Shengli Zhu,Yanqin Liang,Kelvin Wai Kwok Yeung,Shuilin Wu
Bacterial infection and related diseases are threatening the health of human beings. Photocatalytic disinfection as a simple and low-cost disinfection strategy is attracting more and more attention. In this work, TiO 2 nanoparticles (NPs) were modified by co-doping of Ce and Er using the sol–gel method, which endowed TiO 2 NPs with enhanced visible light photocatalytic performance but not pure ultraviolet photocatalytic properties compared the untreated TiO 2 . Our results disclosed that as the doping content of Er increased, the photocatalytic activity of modified TiO 2 NPs initially increased and subsequently decreased. The same trend occurred for Ce doping. When the doping dose of Er and Ce is 0.5 mol% and 0.2 mol%, the 0.5Ce0.2Ti–O calcined at 800 °C presented the best antibacterial properties, with the antibacterial efficiency of 91.23% and 92.8% for Staphylococcus aureus and Escherichia coli , respectively. The existence of Er ions is thought to successfully turn the near-infrared radiation into visible region, which is easier to be absorbed by TiO 2 NPs. Meanwhile, the addition of Ce ions can effectively extend spectral response range and inhibit the recombination of electrons and holes, enhancing the photocatalytic disinfection activity of co-doped TiO 2 .
研究领域:
材料科学
·
微生物学
·
光催化技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）