APPLIED CATALYSIS A-GENERAL
·
2024
·
IF 4.7
Yating Xie,Nicui Yuan,Hongyang Liu,Lukai Luo,Jun Gong,Xiping Yin,Tengfei Li,Yonghua Zhou
Defect engineering by creating oxygen vacancies (OVs) and heterogeneous frustrated Lewis acid-base pairs (FLPs) emerged as an efficient strategy to enhance the selective conversion CO 2 to CH 4 . Considering the intrinsic FLPs contained in UiO-66-NH 2 (UNH for abbreviation), in this paper, the OVs was introduced therein by fabricating the Ce-doped UNH (denoted as UNH(Ce/Zr)) via one-step solvothermal route. The as-prepared UNH(Ce/Zr) catalyst exhibited the CH 4 yield of 31.02 μmol·g −1 ·h −1 accompanied with the CH 4 selectivity of 93 % and satisfying recycling stability. The XRD, SEM, FT-IR, XPS, TG, TPD and NH 3 in situ DRIFTS and in situ FT-IR characterization results justified that the UNH(Ce/Zr) possess the obviously increased OVs sites and enhanced Lewis acidic and basic properties. Additionally, the photoelectrochemical characterization results showed that UNH(Ce/Zr)−0.014 efficiently improved photogenerated electron-hole separation efficiency and charge transfer rate. It could be concluded that it was the cooperative action of OVs and FLPs that led to the high CH 4 selectivity and CH 4 yield.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2022
·
IF 7.758
Zhen Jiao,Zhijia Miao,Heluan An,Qing Li,Xiangyuan Meng
Water eutrophication caused by phosphate emissions has become a serious environmental issue. In this study, we used the solvothermal method to prepare a novel Ce-doped MIL-100(Fe). Scanning electron microscope observations suggest that Ce-doped MIL-100(Fe) consisted of irregular polyhedrons in the size range of tens of micrometers. Spectroscopy results show that cerium atoms (Ce) were successfully doped into the MIL-100(Fe) frameworks. The specific surface area and pore size of the Ce-doped MIL-100(Fe) were 2.6 m 2 /g and 3.4 nm, respectively. Adsorptive kinetics indicated that the pseudo-second-order model with a high correlation coefficient of ( R 2 : 0.9950) fitted better than the pseudo first-order model with R 2 of 0.9436. The adsorptive isotherms showed that for these adsorption reactions, the Langmuir model matched much better than the Freundlich model for this adsorption. These facts suggest that adsorption is chemical sorption, which occurred on a homogeneous surface. The adsorption capacity of the Ce-doped MIL-100(Fe) was as high as 12.03 mg/g. The adsorption capacity of the Ce-doped MIL-100(Fe) depended strongly on the solution pH, ionic strength, and the coexisted ions. The study also found that the precipitation reaction and complexation interaction might be dominated in the adsorption. This study may contribute to the design of bimetal organic frameworks, and might add new insights into the removal of phosphate.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 5
·期 4
·2260-2269
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IF 5.426
Qiulin Zhang,Xin Liu,Ping Ning,Zhongxian Song,Hao Li,Junjie Gu
Mesoporous Ce–Ti–MoOx catalysts have been prepared by stabilization with an in situ formed carbon template and used for selective catalytic reduction of NOx with NH3 (NH3-SCR). The Ce–Ti–MoOx catalysts were characterized by N2 adsorption–desorption, XRD, HR-TEM, H2-TPR and XPS analysis. It was found that the stabilization with a carbon template obviously improved the NOx conversion of the Ce–Ti–MoOx catalyst and the pore distribution. The Ce–Ti–MoOx catalyst stabilized with a carbon template at 850 °C in N2 exhibited the best NH3-SCR activity and showed a uniform mesopore distribution, and more than 90% NOx conversions were obtained at 175–425 °C with a GHSV of 60 000 h−1. The high stabilization temperature with a carbon template in N2 not only led to an increase in specific surface area, pore volume and low-temperature SCR activity, but also contributed to the enhanced redox properties, highly dispersed titanium or molybdenum species and narrow mesopore distribution. The treatment of Ce–Ti–MoOx with a high calcination temperature for removal of the carbon template led to a drastic decrease in surface area, an abrupt decrease in surface oxygen and cerium, production of rutile TiO2, and a correspondingly low SCR activity.
研究领域:
环境科学
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催化化学
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 20
·5605-5625
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IF 5.726
Yan Cui,Leilei Xu,Mindong Chen,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
A series of mesoporous nanocrystalline Ce–Zr solid solutions with different Ce/Zr ratios were successfully synthesized by the evaporation-induced self-assembly strategy, and were employed as catalytic supports of CuO-based catalysts for CO oxidation. These supports and catalysts were systematically characterized by X-ray powder diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), H2 temperature programmed reduction (H2-TPR), CO2 temperature programmed desorption (CO2-TPD), etc. The catalytic performances toward CO oxidation had been carefully evaluated over these CuO-based catalysts. The effects of various influencing factors, such as the Ce/Zr ratio, mesostructure, redox properties of the support, CuO loading amount and calcination temperature, on the low-temperature catalytic activity had been carefully investigated. The results showed that the catalyst supported on the support with a Ce/Zr ratio of 80/20 exhibited the highest catalytic activity. It was also found that the Ce–Zr solid solution mesoporous catalysts exhibited much higher catalytic activity than the counterparts without evident mesostructure, demonstrating the advantages of the mesoporous catalysts by providing more accessible catalytically active sites. Besides, the mesoporous Ce–Zr solid solution-supported catalysts with excellent redox properties displayed much better catalytic performances than the commercial γ-Al2O3-supported catalyst. The kinetic study also indicated that the apparent activation energy of the CO oxidation process was greatly affected by the Ce/Zr ratio, mesostructure, and redox properties of the support. Overall, the present CuO-based catalysts with mesoporous nanocrystalline Ce–Zr solid solutions as supports were considered as a series of promising catalysts for CO oxidation.
研究领域:
催化
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材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 14
·H962
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IF 3.662
Yuanzhen Zhou,Chentao Hao,Yuan Dang,Shuangli Chen
Rare earth Ce-doped ZnO nanorods were successfully synthesized via the hydrothermal method. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) results indicated that Ce ions were successfully doped into ZnO lattice and resulted in smaller nanorods and larger crystallite size, which was advantageous for the improvement of electrocatalytic performance. A highly sensitive and selective sensor for the determination of bisphenol A (BPA) has been strategically designed based on the Ce-doped ZnO nanorods. Furthermore, the electrochemical performances of the Ce-doped ZnO modified CPE (Ce-doped ZnO/CPE) are studied by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) and the electrochemical responses are significantly improved. The oxidation peak currents of BPA are in good linear relationship to its concentrations in the ranges of 0.5∼3.2 μM and 3.2∼62.0 μM and the detection limit for BPA is 0.018 μM, indicating that the modified electrode has good electrocatalytic effect for BPA. Therefore, this novelly proposed sensor might have great potential value in the determination of the environmental hormone pollutants and could be extended to biomedical field, chemical engineering and food industry in the near future.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Qian Li,Yaping Wang,Xiao Xiao,Rui Zhong,Jiali Liao,Junling Guo,Xuepin Liao,Bi Shi
Natural leather (NL) based composite protection materials with lightweight, flexibility, wearability and high shielding efficiency will remarkably innovate the current research on X-ray protection materials. A co-doped Bi/Ce-NL composite with outstanding X-ray attenuation in the energy range of 20−120 keV is successfully fabricated. The uniform distribution of Bi 2 O 3 and CeO 2 nanoparticles in the hierarchical structure of natural leather significantly promotes the X-ray attenuation by improving the weak absorption region of Bi with Ce via synergistic effects of the two elements. The fabricated Bi/Ce-NL loading with 0.755 mmol cm −3 Bi 2 O 3 and 1.51 mmol cm −3 CeO 2 achieves approximately 100% X-ray shielding when the energy below 40 keV. Thus, the fabricated Bi/Ce-NL with superb X-ray attenuation can safely and comfortably protect human from the risk of X-ray exposure with low bulk density, high water vapor permeability, exceptional mechanical properties and excellent bending resistance, presenting significant advantages in wearability and flexibility compared to both traditional lead-based and polymer-based protection materials.
研究领域:
材料科学
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医学防护
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纳米技术
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DOI
高影响因子
Biosensors-Basel
·
2021
·Vol. 11
·期 7
·204
·
IF 5.519
Yanyan Cheng,Ling Liang,Fanggui Ye,Shulin Zhao
Metal–organic framework (MOF) nanozymes, as emerging members of the nanozymes, have received more and more attention due to their composition and structural characteristics. In this work, we report that mixed-valence state Ce-MOF (MVCM) has intrinsic haloperoxidase-mimicking activity. MVCM was synthesized by partial oxidation method using Ce-MOF as a precursor. In the presence of H2O2and Br−, MVCM can catalyze oxidative bromination of chromogenic substrate phenol red (PR) to produce the blue product bromophenol blue (Br4PR), showing good haloperoxidase-like activity. Because of the special chromogenic substrate, we constructed a ratiometric colorimetric-sensing platform by detecting the absorbance of the MVCM-(PR, Br−) system at wavelengths of 590 and 430, for quantifying H2O2, where the detection limit of the H2O2is 3.25 μM. In addition, the haloperoxidase-mimicking mechanism of the MVCM is proposed. Moreover, through enzyme kinetics monitoring, theKm(H2O2and NH4Br) of the MVCM is lower than that of cerium oxide nanomaterials, indicating that the MVCM has a stronger binding affinity for H2O2and NH4Br than other materials. This work provides more application prospects for the development of nanozymes in the field of biosensors in the future.Keywords:nanozyme;Ce-MOF;haloperoxidase-like activity;ratiometric colorimetric;hydrogen peroxide
研究领域:
生物传感
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材料科学
·
酶学
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DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2021
·
IF 4.126
Shuzhen Cui,Faqiang Wang,Kanjun Sun,Xin Wang,Qinzheng Hu,Hui Peng,Guofu Ma,Ziqiang Lei
Doping metal ions into metal compounds is an effective strategy to improve ionic and electronic conductivity and electrochemical properties of metal compounds. Herein, we demonstrate the design and fabrication of novel Ce-doped NiMoO4 nanosheets by a simple hydrothermal method without adding any surfactants and templates toward achieving high-specific energy aqueous hybrid supercapacitors. The doping of Ce ions into the sheet structure of the NiMoO4 material can expand the tunnel structure of the crystal and enhance the electronic conductivity of the nanomaterials, thus providing the electrode material with a large ion storage space and easy ion diffusion channels. The Ce-doped NiMoO4 nanosheet shows a high specific capacity of 107 mA h g–1 at 1 A g–1, which is higher than that of the bare NiMoO4 nanosheet. In addition, a novel hybrid supercapacitor (HSC) is fabricated by using Ce-doped NiMoO4 nanosheets as the positive electrode and Fe3O4@Bi2O3 nanoarrays as the negative electrode, with aqueous KOH as the electrolyte. The Ce-doped NiMoO4//Fe3O4@Bi2O3 HSC has a high output voltage (1.65 V) and a high energy density of 32.8 W h kg–1 at a power density of 415 W kg–1 as well as good electrochemical stability. The results show that Ce-doped NiMoO4 nanosheets can be used as an advanced electrode for supercapacitors.
研究领域:
材料科学
·
能源存储与转换
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产品关联
DOI
高影响因子
Journal of Energy Chemistry
·
2023
·
IF 13.1
Jiangli Feng,Chenhui Wang,Hailin Lei,Songtao Liu,Jing Liu,You Han,Jinli Zhang,Wei Li
Lithium cobalt oxide (LiCoO 2 ) is proverbially employed as cathode materials of lithium-ion batteries attributed to the high theoretical capacity, and currently, it is developing towards higher cut-off voltages in the pursuit of higher energy density. However, it suffers from serious structural degradation and surface side reactions, in particular, at the voltage above 4.60 V, leading to rapid decay of the battery life. Taking into account the desirable oxygen buffering property and the fast ion mobility characteristic of cerium oxide fluoride, in this work, we prepared Ce & F co-modified LiCoO 2 by using the precursors of Ce(NO 3 ) 3 ·6H 2 O and NH 4 F, and evaluated the electrochemical performance under voltages exceeding 4.60 V. The results indicated that the modified samples have multiphase heterostructure of surface CeO 2− x and unique Ce O F solid solution phase. At 3.0–4.60 V and 25 °C, the preferred sample LCO-0.5Ce-0.3F has a high initial discharge specific capacity of 221.9 mA h g −1 at 0.1 C, with the retention of 80.3% and 89.6% after 300 cycles at 1 and 5 C, comparing with the pristine LCO (56.4% and 22.6%). And at 3.0–4.65 V, its retention is 64.0% after 300 cycles at 1 C, versus 8.5% of the pristine LCO. Through structural characterizations and DFT calculations, it suggests that Ce 4+ & F − co-doping suppresses the H3 to H1/3 irreversible phase transition, stabilizes the lattice structure, and reduces the redox activity of the lattice oxygen by modulating the Co 3 d –O 2 p energy band, consequently improving the electrochemical performance of LiCoO 2 at high voltages.
研究领域:
材料科学
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电化学
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电池技术
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DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2021
·Vol. 32
·期 3
·883-894
·
IF 3.543
Li Tian,Huang Peng,Li Xuemei,Wang Rongmin,Lu Zhanxiao,Song Pengfei,He Yufeng
The antimicrobial materials are rapidly emerging as a primary component in mitigation of bacterial pathogens, and functional polymers play a vital role for preparation of antibacterial materials because of their good durability and low toxicity. In this study, a novel antimicrobial materials with double antibacterial centers were synthesized by polymer nanospheres (PNPs) being conjugated with Salphen Ce (IV) complexes (HSpCe). Firstly, a typical antibacterial monomer, [3-(methacryloylamino)propyl]trimethyl ammonium chloride (MPAC), was copolymerized with acrylate monomers including methyl methacrylate (MMA) and butyl acrylate (BA) in EtOH/H 2 O, which afforded the copolymer (PMMB) containing quaternary ammonium salt (QAs). Secondly, a typical antibacterial complex, the Salphen ceric (IV) complex (HSpCe) was mixed with PMMB and styrene (St), and St was further in-situ polymerized, which afforded polymer nanospheres conjugated Salphen Ce complexes (HSpCe@PNPs). Its structure and composition were characterized by UV–Vis, IR, SEM and XPS, while the emulsifying properties were measured. Then, its antibacterial performance was evaluated against E. coli and S. aureus . It was found that HSpCe@PNPs presented an excellent antibacterial activity, which is much higher than that of QAs and HSpCe alone. And the antibacterial activities were more than 99% at the minimum inhibitory concentration (700 μg mL −1 ), which is mainly the result of the conjugation of QAs and HSpCe. In summary, a novel antibacterial polymer material with double antibacterial centers was successfully synthesized, which greatly improved the antibacterial activity of the material, and was expected to be applied in the field of antibacterial coatings and medicine. Graphical Abstract Polymer nanospheres conjugated Salphen Ce complexes (HSpCe@PNPs) were synthesized by one-pot two-steps method, and the obtained HSpCe@PNPs would create new opportunities in a wide variety of applications.
研究领域:
材料科学
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微生物学
·
生物医学工程
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产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2020
·Vol. 412
·期 4
·849-860
·
IF 3.637
Huang Xiaozhou,Huang Dihui,Chen JinYang,Ye Ruihong,Lin Qian,Chen Sheng
In this paper, a novel bimetallic Ce-Ni metal-organic frameworks (Ce-Ni-MOF) are synthesized by hydrothermal reaction, using 1,3,5-benzenetricarboxylic acid as a ligand. In particular, the bimetallic Ce-Ni-MOF with the largest specific surface area and catalytic sites was synthesized when the molar ratio of Ce 3+ to Ni 2+ was 3:7. Bimetallic Ce-Ni-MOF is added to the traditional conductive material of multiwall carbon nanotubes (MWCNTs) to play their synergistic effect, improve the conductivity, specific surface area, and catalytic site of the MWCNTs. A novel bisphenol A (BPA) sensor was successfully prepared by a self-assembled multilayer strategy of Ce-Ni-MOF/MWCNTs modified glassy carbon electrodes (GCE). Field emission scanning electron microscopy, powder X-ray diffraction, and transmission electron microscope were carried out to characterize the Ce-Ni-MOF/MWCNTs. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used as a sensitive analytical method for the determination of BPA, and a wider linear dynamic range of BPA determination in 0.1 μmol·L −1 to 100 μmol·L −1 with a detection limit of 7.8 nmol·L −1 (S/ N = 3). The proposed method was applied to measure the content of BPA in different brands of drinking water with satisfying recovery from 97.4 to 102.4%.
Graphical abstract
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Xuyang Liu,Chao Shi,Dongxu Guang,Lijuan Yao,Bobo Li,Xuan Fang,Mingxia Qiu,Dan Wu,Peigang Han
Metal halide perovskites have triggered numerous studies in the application of optoelectronic devices. In this work, we incorporated Ce3+ ions into the MAPbBr3 perovskite to extend the photoluminescence spectrum from the green light region to red light region, which can be attributed to the dopant-induced self-trapped exciton (STE) emission. Furthermore, the non-equivalent substitution of Ce3+ ions for the Pb2+ ions can result in extra electrons, thus can change the type of dominant carriers and improve the carrier mobility. The MAPbBr3:Ce based photodetector exhibited a broadband photodetection capability over a wide range from 340 nm to 650 nm. In addition, after doping Ce3+ ions, the maximum device responsivity, detectivity and external quantum efficiency were efficiently improved. These results provide a new approach to highly-efficient and broadband-detecting photoconductive photodetectors.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）