Catalysts
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2023
·Vol. 13
·期 5
·821
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IF 3.9
Xiaowang Lu,Wenxuan Chen,Haijun Hou,Junchao Qian,Qinfang Zhang
A two-dimensional layered CeO2/Bi2O3composite was synthesized by microwave solvothermal method. X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), UV-Vis diffuse reflection spectroscopy (DRS), and X-ray photoelectron spectroscopy (XPS) were used to studied crystal structure, morphology, optical performance, elemental composition and the surface electronic state of the samples. The photocatalytic properties of the prepared samples were evaluated by photocatalytic desulfurization under visible light. When the molar ratio of Ce and Bi was 1:2, CeO2/Bi2O3composite presented the highest photocatalytic desulfurization rate. Transient Photocurrent measurement, electrochemical impedance spectroscopy (EIS) and photoluminescence spectroscopy (PL) showed that CeO2and Bi2O3formed a heterojunction, which could promote the separation of photogenerated electrons and holes, improving the photocatalytic activity. Furthermore, it was found that the active species of hydroxyl radical (·OH) played an important role in the photocatalytic degradation of dibenzothiophene (DBT) based on the active species capture experiment. Finally, a plausible mechanism for the photocatalytic oxidative desulfurization of this nanocomposite was proposed.Keywords:CeO2;Bi2O3;composite;heterojunction;photocatalytic desulfurization
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Meiqi Mu,Jing Yu,Zhiqian Yao,Suqiong Xu,Chuicai Rong,Xianke Zhang,Zuzhou Xiong,Xingquan Wang,Xiaokang Li,Jujun Yuan
CeO 2 /Co/C composites have been successfully prepared by a template method. When being applied as electromagnetic (EM) wave absorbers, CeO 2 /Co/C composites exhibit stronger EM wave absorption properties than Co/C and CeO 2 /C composites. The enhanced performance can be attributed to the unique structures of CeO 2 /Co/C composites, in which the synergistic effect of conductance loss, polarization loss together with magnetic loss play an important role for improving the EM wave absorption properties. Additionally, the CeO 2 /Co/C composites own more heterogeneous interfaces and high porosity, which promotes the continuous occurrence of interface polarization and dipole polarization, resulting in increased multiple scattering. The CeO 2 /Co/C composites show a RL min of − 55.02 dB and an EAB of 3.29 GHz at the matching thickness of 2.82 mm. This work provides an effective strategy for constructing CeO 2 /Co/C composites for microwave absorbing material with high performances.
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TALANTA
·
2024
·
IF 5.6
Xuan Zhang,Nan Hao,Shucheng Liu,Kai Wei,Changchang Ma,Jianming Pan,Sheng Feng
Methyl paraoxon (MP) is a highly toxic, efficient and broad-spectrum organophosphorus pesticide , which poses significant risks to ecological environment and human health. Many detection methods for MP are based on the enzyme catalytic or inhibition effect. But natural biological enzymes are relatively expensive and easy to be inactivated with a short service life . As a unique tool of nanotechnology with enzyme-like characteristics, nanozyme has attracted increasing concern. However, a large proportion of nanozymes lack the intrinsic specificity, becoming a main barrier of constraining their use in biochemical analysis. Here, we use a one-pot reverse microemulsion polymerization combine the gold nanoclusters (AuNCs) with molecularly imprinted polymers (MIPs), polydopamine (PDA) and hollow CeO 2 nanospheres to synthesize the bright red-orange fluorescence probe (CeO 2 @PDA@AuNCs-MIPs) with high phosphatase-like activity for selective detection of MP. The hollow structure possesses a specific surface area and porous matrix, which not only increases the exposure of active sites but also enhances the efficiency of mass and electron transport . Consequently, this structure significantly enhances the catalytic activity by reducing transport distances. The introduced MIPs provide the specific recognition sites for MP. And Ce (III) can excite aggregation induced emission of AuNCs and enhance the fluorescent signal. The absolute fluorescence quantum yield (FLQY) of CeO 2 @PDA@AuNCs-MIPs (1.41 %) was 12.8-fold higher than that of the GSH-AuNCs (0.11 %). With the presence of MP, Ce (IV)/Ce (III) species serve as the active sites to polarize and hydrolyze phosphate bonds to generate p -nitrophenol (p-NP), which can quench the fluorescent signal through the inner-filter effect. The as-prepared CeO 2 @PDA@AuNCs-MIPs nanozyme-based fluorescence method for MP detection displayed superior analytical performances with wide linearities range of 0.45–125 nM and the detection limit of 0.15 nM. Furthermore, the designed method offers satisfactory practical application ability. The developed method is simple and effective for the in-field detection.
研究领域:
环境科学
·
分析化学
·
纳米技术
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PubMed
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APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Weihao Fan,Huaiyuan Wang,Chijia Wang,Zhanjian Liu,Yanji Zhu,Kaka Li
CeO 2 -PANI conductive polymer capsules were prepared by in-situ chemical oxidation polymerization. The capsules were dispersed in F51 epoxy resin and then sprayed onto the steel surface to form novel coatings after curing. The corrosion resistance of coatings was investigated by EIS in a 3.5 wt% NaCl solution. After 30 days, the 60-μm-thin coating containing CeO 2 -PANI capsules exhibited the highest corrosion resistance, and its impedance modulus was higher than 10 9 Ω·cm 2 , which was 10 times that of conventional PANI-Epoxy coatings. This improvement was attributed to the (Fe 3 O 4 + γ-Fe 2 O 3 + CeO 2 ) passive film actively formed by the synergistic effect of PANI and Ce 3+ ions. PANI polarized the anodic reaction and Ce 3+ inhibited the cathodic reaction.
研究领域:
材料科学
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腐蚀工程
·
聚合物化学
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CRYSTENGCOMM
·
2015
·Vol. 17
·期 13
·2690-2697
·
IF 4.034
Ke Tang,Jingcai Zhang,Wenzhi Wang,Shuping Wang,Jinxin Guo,Yanzhao Yang
A simple protocol has been reported here to successfully perform a controllable conversion between Ce(OH)4 nanorods [Ce(OH)4-NR] and Ce(OH)4 nanoflowers [Ce(OH)4-NF] based on a prolonged mechanical force-driven stirring process. Results show that the Ce(OH)4 nanostructures undergo a morphology transformation from the initial nanorods to irregular nanoflowers, then to nanoflowers emanating from one center only, by varying the stirring time before solvothermal reaction. The detailed study confirmed that the mechanical force significantly improved the mass transport of the solution and drove the seeds of Ce(OH)4-NR [seeds-NR] to generate the seeds of Ce(OH)4-NF [seeds-NF]. The final CeO2 products (CeO2 nanorods [CeO2-NR] and CeO2 nanoflowers [CeO2-NF]) that inherited the original morphology were obtained by annealing Ce(OH)4-NR and Ce(OH)4-NF, respectively. To further optimize the performance of the final products, Au/CeO2-NR and Au/CeO2-NF were synthesized by a simple oxidation–reduction process, which led to increased surface areas and promising potential in CO oxidation.
研究领域:
材料科学
·
化学工程
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
·
IF 22.1
Rui Liu,Xianhua Zhang,Tao Liu,Xian Yao,Zhijian Zhao,Chunlei Pei,Jinlong Gong
The oxygen species over oxygen carriers determine the reaction performance in chemical looping partial oxidation of methane (CLPOM). This paper describes the dynamic migration and reaction of oxygen species over ceria-supported NiO oxygen carrier for CLPOM. At initial reaction stage, Ni-O species could be consumed rapidly and cause the full oxidation of methane to CO 2 . Afterwards, the active Ni-O-Ce species dominates the methane partial oxidation to promote the syngas yield. It is found that CO formation rate is linearly related with the content of oxygen species over Ni-O-Ce. Furthermore, the lattice oxygen from CeO 2 would migrate through the bulk to complement the consumed Ni-O-Ce oxygen species. Eventually, 5NiO/(40CeO 2 -Al 2 O 3 ) exhibit nearly three times as high as methane reaction rate of CeO 2 /Al 2 O 3 and two times as high as CO formation rate of 5NiO/Al 2 O 3 . This work provides the comprehensive understanding of transport and reaction mechanism of oxygen species for chemical looping processes.
研究领域:
化学工程
·
能源科学
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xiaoyan He,Dan Su,Xiuqin Bai,Chengqing Yuan
Ceria (CeO2) nanoparticles with haloperoxidase (HPO)-like activity have gained attention as a biologically benign antifoulant. 3,4-Dihydroxy-l-phenylalanine (DOPA), a main composition in mussel foot proteins, plays a crucial role in the biofouling process. However, the impact on the HPO-like activity and antifouling performance of CeO2 nanoparticles when DOPA molecules adsorb on them remains unexplored. This interesting question warrants investigation, particularly considering that it may occur in an actual marine environment. Herein, the interaction between DOPA and CeO2 is explored. Despite the higher Ce3+ fractions and the lower band gap energies due to the electron transfer from DOPA to the CeO2 surface, DOPA still had a slightly negative effect on the HPO-like activity of CeO2 since they decreased the exposed Ce3+ sites. The DOPA-CeO2 nanocomposites with HPO-like activities could kill bacteria and trigger quorum-sensing signaling quenching, achieving a biofilm inhibition performance. Amazingly, 0.1% DOPA-CeO2 nanocomposite exhibited higher antibacterial activity and better biofilm suppression activities due to its HPO-like activity and positive zeta potential. The remarkable results demonstrated that DOPA, as a participant in the biofouling process, could enhance the antibacterial activity and antifouling performance of CeO2 nanoparticles at an appropriate concentration.
研究领域:
材料科学
·
生物医学工程
·
微生物学
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PubMed
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JOURNAL OF CATALYSIS
·
2025
·
IF 6.5
Ziheng Zhen,Antai Li,Tiantian Xiao,Maoshuai Li,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Bimetallic catalyst with dual-atom pairs has drawn much attention in heterogeneous catalysis due to their unique synergistic effects. In this work, we prepared a series CeO 2 supported Cu-Pt dual sites catalysts and found the optimized one of 2Cu0.025Pt/CeO 2 exhibited excellent performance in the hydrogenation of methyl acetate (MA). Its product yield of ethanol was as 4 times as that of 2Cu/CeO 2 catalyst under the same reaction conditions, with only 0.025 wt% Pt addition. Combined with various characterizations and contrast samples, it is demonstrated that the post-deposited trace Pt species preferentially located besides the copper atoms and formed Cu-Pt atomic pairs. But when further increasing the loading of Pt, the aggregation of Cu happened, leading to a rapid decrease of activity. To reveal the role of Cu-Pt atom pairs in the hydrogenation of carbon–oxygen bonds reactions, we conducted chemisorption experiments and DFT simulations. It is suggested that Cu-Pt atomic pairs significantly enhanced the adsorption and activation capability of both the MA and H 2 molecules during the reaction. These insights may provide synthesis and design strategy for high-performance dual-atom sites catalysts for the carbon–oxygen bonds hydrogenation reactions.
研究领域:
催化化学
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材料科学
·
理论计算
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Qiang Tan,Ting Qu,Cheng-yong Shu,Yan Liu,Yuting He,Wenfang Zhai,Sheng-wu Guo,Liting Liu,Yong-ning Liu
The broad application of direct methanol fuel cells (DMFCs) is impeded by the high cost of catalysts, the unsatisfied ionic conductivity of polymer electrolyte membrane (PEM), and the methanol crossover. To address the above issues, a unique strategy based on the permeable polymer fiber membrane (PFM) and nonplatinum catalysts was presented to achieve high-performance DMFCs. In this system, the high-dispersed Pd/Co–CeO2/C and methanol-tolerance NiCo2O4 were prepared and used as anode and cathode catalysts. Besides, the PEM was substituted by an inexpensive and electrolyte permeable PFM. As fabricated PFM-based DMFC shows encouraging performance (58.6 mW·cm–2), which is 3.1 times higher than that of classical PtRu catalysts and PEM-based cell (19.1 mW·cm–2) at room temperature, and the maximum power density of PFM-based cell even could reach up to 126.2 mW·cm–2 (26.1 mW cm–2 with air-feed) at 60 °C. Furthermore, the PFM-based cell exhibits excellent stability performance in the 200 h long-time discharging test. The high electrocatalytic activity and selectivity of the catalysts, observably decreased membrane resistance of PFM, and unique structure of PFM-based membrane electrode assembly are combined to boost the performance. It provides a new strategy to achieve high-performance DMFCs and substitute for the expensive Pt catalysts and polymer-electrocatalyzed membrane.
研究领域:
材料科学
·
能源技术
·
电化学
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高影响因子
Molecular Catalysis
·
2019
·
IF 2.938
Qi Song,Rui Ran,Jiancai Ding,Xiaodong Wu,Zichun Si,Duan Weng
Porous ceria nanorods modified with Fe or Co were prepared via a hydrothermal method. The structural properties, catalytic activities for the total oxidation of propane, and catalytic mechanisms of these materials were systematically investigated by X-ray diffraction, Raman spectroscopy, N 2 adsorption–desorption, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, catalytic activity measurements and in situ Fourier transform infrared spectroscopy. Co-modified ceria exhibited the best catalytic activity during propane oxidation as well as enhanced reducibility due to the synergistic interactions between the Co and the CeO 2 support. Variations in the activating ability and reducibility of the catalysts resulted in the formation of distinctive intermediates during the catalytic process, and this explained the observed differences in catalytic performance.
研究领域:
材料科学
·
催化化学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2015
·
IF 3.368
Xiaole Weng,Xiaoxia Dai,Qingshan Zeng,Yue Liu,Zhongbiao Wu
Heteropoly acids (HPAs) have been effectively utilized in selective catalytic reduction (SCR) of NO to improve the NH 3 absorption capacity and alkaline/alkali metal resistance for SCR catalysts. However, despite the promise on super-acidities, their other properties that would work on SCR process are still lack of exploration. In this study, a 12-tungstaphosphoric acid (H 3 PW 12 O 40 , HPW) was selected to modify a well-reported CeO 2 catalyst. The resulted CeO 2 /HPW catalyst was subsequently utilized for SCR of NO with excess NH 3 , which revealed a significantly promoted performance in SCR reaction. DRIFT analyses showed that the unique NO 2 absorption capacity of HPW could prevent the NO 2 being further oxidized into nitrate species and the abundant Brønsted acid sites could effectively retain the NH 3 , avoiding them being over-oxidized at evaluated temperatures. The presence of NO 2 was demonstrated able to induce a so called “fast SCR” reaction over the CeO 2 /HPW catalyst, which effectively facilitated the SCR reaction. Furthermore, we have also constructed a CeO 2 @HPW catalyst, which showed an enhanced SO 2 poisoning resistance in SCR reaction.
研究领域:
环境科学
·
催化化学
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Ning Lu,Shurui Fan,Yaxu Zhao,Boxuan Yang,Zhongqiu Hua,Yi Wu
In this work, a selective methane gas sensor was prepared based on In 2 O 3 to eliminate the serious cross-sensitive sensitivity to VOCs, NO 2 , and CO, which are typical interfering gases for methane detection in domestic. The catalytic films of Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 were placed on the top of the sensing layer, i.e., In 2 O 3 loaded with Pd. Catalytic films were designed as filters to catalytically oxidize the interfering gases, such as VOCs, to prevent them reaching the surface of the sensitive layers. Thanks to this design, our sensors showed a high selectivity to methane, even in the presence of ethanol, CO, and NO 2 . In addition, we confirmed via the power-law response of oxygen that the basic sensing mechanism between Pd-In 2 O 3 and the sensor-printed catalytic films are kept the same. Both follow the general model with MOS sensors, which involves an electron transfer process resulting from the adsorption of oxygen on the surface and interaction with methane molecules. The present study showed that catalytic filter films (Pt-TiO 2 , Pt-CeO 2 , and Pt-ZrO 2 ) printed on Pd-In 2 O 3 sensors could enhance the selective response to methane for methane monitoring.
研究领域:
材料科学
·
化学传感器
·
气体传感技术
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