Materials
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2019
·Vol. 12
·期 7
·1163
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IF 2.972
Jiali Xue,Kuibao Zhang,Zongsheng He,Wenwen Zhao,Weiwei Li,Dayan Xie,Baozhu Luo,Kai Xu,Haibin Zhang
A rapid and effective method is necessary in the disposal of severely radioactive contaminated soil waste. Simulated Ce-bearing radioactive soil waste was immobilized by self-propagating high-temperature synthesis (SHS) within 5 min in this study. The main work includes the rapid synthesis of soil waste forms, the analysis of phase composition, microstructure and chemical durability. These results show that the simulated nuclide Ce was successfully immobilized into the pyrochlore-rich waste matrice, whose main phases are SiO2, pyrochlore (Gd2Ti2O7) and Cu. The normalized leaching rates of Si and Na on the 42nd day are 1.86 × 10−3and 1.63 × 10−2g·m−2·d−1, respectively. And the normalized leaching rate of Ce also remains at low level (10−5–10−6g·m−2·d−1) within 42 days.Keywords:Radioactive soil waste;Gd2Ti2O7pyrochlore;SHS;CeO2;Immobilization
研究领域:
材料科学
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环境科学
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PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
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2019
·
IF 4.182
Ruyue Niu,Pengcheng Liu,Wei Li,Shuang Wang,Jinping Li
0.123%Pd encapsulated in nanosized silicalite-1 (MFI) zeolite catalysts has been prepared by direct hydrothermal conditions, and its catalytic performance at the low concentration methane combustion was studied. The temperatures for methane ignition ( T 10% ), the half-conversion temperature ( T 50% ) and the total conversion temperature ( T 90% ) over Pd/S-1-in (in-situ method) catalyst are 261, 329 and 382 °C, respectively, which are lower than the corresponding temperatures of Pd/S-1-im (incipient impregnation method) catalyst. Moreover, the properties are further enhanced by introducing CeO 2 into the Pd/S-1-in catalyst. The conversion rate decreased slightly from 91 to 85% when the reaction is carried out at 450 °C for 100 h at the gas hourly space velocities (GHSV) of 112500 mL g −1 h −1 . The XPS analysis showed that Pd clusters were encapsulated within the porous rather than on the surface of the crystal by in-situ method. The HRTEM studies demonstrated that the Pd particle encapsulated within Silicalite-1 zeolites are well dispersed and evenly distributed throughout the Silicalite-1 zeolites. The average size of in situ Pd particle encapsulated in Silicalite-1 zeolite is 1.7 nm, which is much smaller than the impregnated Pd/S-1-im catalyst (2.8 nm).
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2014
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IF 2.086
He Miao,Guanghui Liu,Yi Zhang,Changrong He,Yifeng Zheng,Wei Guo Wang
Electrolyte-supported solid oxide fuel cells (NiO-1Ce10ScZr | 1Ce10ScZr | LSM-1Ce10ScZr) were prepared in this study. The effects of co-sintering temperatures of cathode and anode with electrolyte and the additions of metal oxide (Bi 2 O 3 and CeO 2 ) in the anode on the microstructures and electrochemical properties were investigated. The carbon deposition behaviors of the anode with added CeO 2 were also evaluated. Results indicated that the maximum power density ( P max ) initially increased from 0.28 W/cm 2 (1150 °C) to 0.35 W/cm 2 (1250 °C), and then decreased to 0.33 W/cm 2 (1300 °C) with the increase in co-sintering temperature from 1150 °C to 1300 °C. The variation tendency of P max was attributed to a complex combination of the bond strength increase of the interfaces and the densification of the electrodes with the increase of the co-sintering temperature. Adding proper CeO 2 in the anode effectively improved the electrochemical properties of the ZrO 2 doped with Sc 2 O 3 electrolyte-supported single cells. This phenomenon could be related to the increase of the dimension of three-phase boundary. The P max of the SSZ electrolyte-supported single cell with the anode mixed with 1.0 wt% CeO 2 could reach 0.42 W/cm 2 . The mixture of 1.0 wt% CeO 2 in the anode could also effectively suppress the carbon deposition of CH 4 on the anode surface.
研究领域:
材料科学
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能源工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Jinpeng Lv,Meihua Fang,Yuan Liu
The room temperature d 0 ferromagnetism origin is still highly controversial in oxide systems, due to the lack of subtle experimental set-up as well as sensitive defect detection. Herein, we developed O-rich treatments on Ceria nanocrystals , H 2 O 2 and O 2 ambient exposure, which creates intrinsic O defects without introducing trace level of impurities or changing crystallinity. Interestingly, results found that significant oxygen adsorption along with distinct augment of RT ferromagnetism were observed after both H 2 O 2 treatment and O 2 ambient exposure. The more the oxygen molecule adsorbed, the stronger the ferromagnetism was. Furthermore, Electron Spin Resonance (EPR) results illustrate that the Ce 3+ concentration experienced reverse variation in H 2 O 2 treated-and O 2 exposed-samples, thus excluding the possibility of Ce cation as the cause of the ferromagnetism. Similar magnetism enhancements were also observed in La 2 O 3 , ZrO 2 and SrTiO 3 nanocrystals after H 2 O 2 treatment. Based on these results, we surmise that the interstitial oxygen, rather than the other sources, facilitated the electron transfer and the dilute ferromagnetism of CeO 2 . This work established a general model in clarifying the origin of the disputed ferromagnetism in metal oxide system.
研究领域:
材料科学
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物理学
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ELECTROCHIMICA ACTA
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2018
·
IF 5.116
Cheng Du,Xiaohui Gao,Chunfeng Cheng,Zhihua Zhuang,Xiaokun Li,Wei Chen
Metal nanoclusters have attracted increasing attentions due to their extremely high catalytic activities. However, how to keep their structural and catalytic stabilities is still a challenge, especially in electrocatalysis . Herein, a novel mutual-interacted Pt CeO 2 C ternary nanostructure was designed and fabricated from Ce-based metal organic framework (Ce-MOF). In this unique nanostructure, through a calcination process, abundant tiny CeO 2 nanoclusters (∼2 nm) can be produced from the Ce-MOF itself and they are uniformly inserted in the MOF-derived porous carbon matrix. Meanwhile, the following deposited surfactant-free Pt nanoclusters (∼2 nm) contact well with both carbon and CeO 2 nanoclusters. The electrocatalytic activity of the Pt CeO 2 C ternary nanostructure for the oxygen reduction reaction (ORR) was investigated. With such ternary structure, the interacted CeO 2 and Pt nanoclusters showed high stability. Moreover, the CeO 2 can modify the electronic density of Pt and enhance the interaction between Pt and carbon at the Pt CeO 2 interface. Meanwhile, with the mutual interaction, the corrosion resistance of carbon can be improved at the CeO 2 C interface, and the conductivity of the catalyst can be improved with the carbon framework. With these structure advantages, the Ce-MOF-derived catalyst exhibited higher electrocatalytic performance than commercial Pt C for ORR with more positive half-wave potential and higher limiting diffusion current density. The origin of the enhanced ORR performance was further disclosed by X-ray absorption fine spectroscopy (XAFS) characterization.
研究领域:
材料科学
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电化学
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高影响因子
LANGMUIR
·
2023
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IF 3.9
Qiang Ma,Lijun Jiang,Bowen Yang,Bowen Xu,Qingyuan Wang,Qihong Wu,Ping Ning,Yingjie Zhang,Jin Huang,Jiming Hao
Gaseous thallium (Tl) pollution events, primarily caused by non-ferrous mineral refineries and fossil fuel combustion, have increased over the past few decades. To prevent gaseous Tl distribution from flue gas, MnO2/CeO2@HKUST-1 (MCH) was synthesized and found to achieve a gaseous Tl(I) removal level of up to 90% at 423 K, a weight hourly space velocity (WHSV) of 2000 h–1/mL with an Mn dose of 10%, maintained over 10 h. The best Mn/Ce ratio was found to be 9:1. To further investigate surface kinetic behavior, four commonly used kinetic models were applied, including the Eley–Rideal (ER) model, Langmuir–Hinshelwood (LH) model, Mars–van Krevelen (MVK) model, and pseudo-first-order (PFO) model. While the ER and LH models had the slightest deviation, the MVK model was the most reliable. The CatMAP software was also used to match the simulation deviation. This work demonstrated the Tl removal mechanism and provided insights into the accuracy of kinetic models on minor-radius heavy metal. Thus, this research may help promote the design of reactors, heavy metal removal rates, and flue gas purification technology selection.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2026
·
IF 7.3
Shiyu Huang,Yinze Yang,Yan Du,Pengxiao Wei,Yafei Zhao,Huishan Shang,Dan Wang,Dongyang Li,Bing Zhang
A bifunctional Cu/CeO2/halloysite catalyst was rationally constructed via strong electrostatic adsorption to enable switchable conversion of furfural into either furfuryl alcohol or isopropyl furfuryl ether. Highly dispersed Cu nanoparticles are anchored on CeO2 nanoislands supported by acid-etched halloysite nanotubes, creating a unique “support–adjuvant–active site” synergy. This architecture facilitates H2 activation and tandem hydrogenation–etherification, allowing precise temperature-controlled pathway selection. Under mild conditions, furfural hydrogenation to furfuryl alcohol proceeds via a low-energy barrier (0.9 eV) with a stable intermediate, whereas etherification requires overcoming a significant barrier (1.6 eV), becoming favorable only at elevated temperatures. In situ FTIR, kinetic studies, and DFT calculations reveal the mechanistic origin of this selectivity. The catalyst displays high activity, tunable selectivity, and robust recyclability, providing a versatile strategy for controlling reaction pathways in the valorization of biomass-derived platform molecules.
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ACS Sensors
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2026
·
IF 9.1
Lulu Tian,Songtao Hu,Qihang Ding,Zhenyu Ma,Cong Chen,Chunyan Li,Kun Wang,Juanrui Du,Yujia Shi,Jong Seung Kim,Lin Wang,Biao Dong
Monolayer noble metal nanoparticle (NP) arrays hold great promise as surface-enhanced Raman scattering (SERS) substrates due to their strong SERS performance and cost-effectiveness. However, precise regulation of hotspot intensity and density remains a critical challenge for practical applications. Here, we propose a SERS substrate based on Janus-structure NPs, which realizes accessible metal–semiconductor interface hotspots, as well as the regulation of interparticle nanogaps of ∼1 nm through a multifunctional surface ligand. By selectively depositing cerium oxide (CeO2) onto one terminus of gold nanorods (Au NRs), we fabricate Janus nanostructures that generate highly accessible and intensified hotspots. Another key enabler of this advancement is 4-mercaptophenylboronic acid (MPBA), a multifunctional ligand that precisely regulates interparticle spacing, increases hotspot density, and simultaneously serves as both a Raman molecule and a bacterial recognition unit. The SERS enhancement effect of the Janus NP array can reach more than 11 times that of the conventional Au NR array. Based on this MPBA-functionalized Janus NP array substrate, a SERS sensor for Escherichia coli was constructed, which exhibited a robust linear detection response to bacterial concentrations ranging from 6 to 6 × 104 CFU/μL, with an ultralow detection limit of approximately 1.1 CFU/μL. Our work introduces a versatile strategy for next-generation SERS substrates.
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高影响因子
Materials
·
2026
·Vol. 19
·期 1
·
IF 3.2
Jiayue Xie,Kai Feng,Rui Ye,Maokui Wang,Yunci Wang,Xing Fan,Renlong Liu
As the core abrasive in chemical mechanical polishing (CMP) processes, the morphology, size uniformity, and chemical reactivity of CeO2nanoparticles (NPs) are crucial factors determining the surface precision and yield of devices. In this work, a KNO3–LiNO3eutectic molten salt was used as the reaction medium. By systematically adjusting key processing parameters (such as the type of cerium source, the species and dosage of surfactants, and calcination conditions), the regulatory effects of these factors on particle growth mechanisms were clarified. This adjustment enabled the controlled synthesis of spherical CeO2NPs with customized morphology, particle size, and surface defect states. The multi-stage reaction process of the precursor during calcination was identified by applying thermal analysis techniques, including TG-DSC and TG-FTIR. This process includes dehydration, ion exchange, and thermal decomposition. Microstructural analysis shows that the type and dosage of the cerium source and template agent significantly affect the uniformity of particle size and spherical morphology. Moreover, by using an optimized process with a heating rate of 6 °C/min and maintaining at 400 °C for 3 h, spherical CeO2NPs with an average particle size of 60 nm, uniform size distribution, and high sphericity were successfully synthesized via a single-step calcination process. Based on these findings, a further proposal was put forward regarding a crystal growth mechanism mediated by micelle-directed assembly and oriented attachment. This method only requires a single calcination step, has mild reaction conditions, and involves a simple process without the need for specialized equipment—features that show great potential for scalable production. It provides both a theoretical basis and experimental support for the controlled preparation of high-performance CeO2abrasives.
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PubMed
高影响因子
Catalysts
·
2022
·Vol. 12
·期 8
·887
·
IF 4.501
Yu Hao,Shaohua Chen,Xueyin Zhang,Tiehong Chen
Pt1/CeO2nanospheres (Pt/CeO2-NS) were synthesized by the bath oiling method with L-asparagine as a necessary additive. Owing to the morphology control effect and coordination interaction of L-asparagine, CeO2nanospheres can retain their nanosphere structure and show stronger electronic metal-support interaction with highly dispersed Pt. Moreover, the toluene catalytic combustion performance of Pt/CeO2-NS was investigated. The structure-performance relationship is analyzed according to the coordination state of Pt. The Pt/CeO2-NS catalyst exhibited superior catalytic activity than the commercial CeO2-supported Pt catalyst, which is attributed to its higher oxygen vacancy and Pt4+.
研究领域:
催化化学
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材料科学
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环境科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Dongjing Liu,Weiguo Zhou,Jiang Wu
x Ce y Mn/ZSM-5 sorbents were prepared using sol–gel method and employed for H 2 S removal in the temperature range of 600–800 °C. The sorbents exhibited high performance in sulfur removal due to the cooperative effect of CeO 2 and MnO x . The presence of H 2 was unfavorable for sulfidation and obviously shortened the breakthrough time and reduced the sulfur capacity. However, the existence of CO had little impact on the sulfur-removal performance. The characterization results revealed that the ZSM-5 structure remained intact during preparation and sulfidation process. And active species, such as CeO 2 and Mn 2 O 3 , were well dispersed on ZSM-5, which would suppress the mechanical disintegration and improve the thermal stability of x Ce y Mn/ZSM-5.
研究领域:
环境催化
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能源化学工程
·
材料科学
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无机功能材料
·
气体净化技术
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DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
Khurshid Hussain,Ijaz Ali,Sayed Hasnain,Sayed Sajid Hussain,Basharat Hussain,Muhammad Shehzad Khan,Syed Muhammad Ammar,Bilal Hussain,Aqib Hussain,Muhammad Amir Javed,Abid Ullah,Saleh Al Arni,Noureddine Elboughdiri,Nadir Abbas
A novel Mg - doped CeO 2 electrode materials were prepared by simple and cost effective hydrothermal method by using three different reagents (ammonium fluoride, potassium hydroxide and hexamethylenetetramine). Successful preparation was confirmed by using various characterizations. In three electrode setup, CeO 2 : Mg-NH 4 F, CeO 2 : Mg-KOH, and CeO 2 : Mg-HMTA showed a high specific capacitance of 432, 275 and 221 F g −1 at 1 A g −1 respectively. After 10,000 continuous cycles of charging and discharging, only 11% fade in the specific capacitance was observed for CeO 2 : Mg-NH 4 F. Moreover, CeO 2 : Mg-NH 4 F was used as a positive electrode and (activated carbon) AC as a negative electrode for asymmetric supercapacitor (ASC) device. The highest specific capacity of 130C g −1 at 1 A g −1 was obtained for ASC device. ASC device delivered a high energy density of 28.8 Wh kg −1 at a power density of 775 W kg −1 . ASC device showed an excellent retention of 83% and an outstanding coulombic efficiency of 99% after 9000 cycles. All these attractive results suggest the importance of this electrode material towards practical applications.
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高影响因子
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