JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 16
·13271-13289
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IF 2.779
Yu Xiaochen,Song Zeyu,Dong Xiaoqian,Li Huajian,Liu Haonan,Zhao Baoyan,Ye Ting,Jiang Yinlin,Li Xiaojie,Duan Li,Fan Jibin,Zhao Peng
g-C 3 N 4 and rare earth (RE)-doped (Yb, Nd and Ce) g-C 3 N 4 nanosheets were synthesized by a thermal method. The remarkable effects of RE doping on the structural, morphological, and optical properties of g-C 3 N 4 were investigated using XRD, FT-IR, SEM, BET, XPS, UV–Vis, PL, EIS and Mott–Schottky characterization techniques. The photocatalytic activities of RE doped g-C 3 N 4 nanosheets for different dyes were improved compared with g-C 3 N 4 under visible light irradiation, among which Ce/g-C 3 N 4 showed outstanding performance. Due to the doping of RE, it modulates the electronic structure of pristine g-C 3 N 4 and broadens its optical absorption range. In addition, a possible mechanism of photocatalytic degradation of dyes was propounded by free radical trapping experiments. This work may provide a reference for the rational design of photocatalysts and inspiration for the photocatalytic mechanism.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 10
·5875-5884
·
IF 10.7
Hui Guo,Yifeng Li,Lulu Jiang,Yenan Sha,Shihang Guo,Donglin Han
Proton conducting oxides are attracting increasing attention due to their promising application as electrolytes in solid-state electrochemical devices for energy conversion and chemical production, including protonic ceramic fuel cells, electrolyzers and membrane reactors. BaZrO3 and Ba(Zr,Ce)O3 substituted by acceptor dopants are currently the most promising proton conductors. In principle, replacing Zr or Ce with one kind of trivalent element (e.g., Y or Yb) can generate oxygen vacancies, which are necessary for the hydration reaction to introduce charge carriers of protons. However, it is commonly recognized that substituting Zr or Ce with Y and Yb simultaneously leads to high performance of the devices, but the reason is not clear. In this work, we studied the transport properties of four different compositional classes: BaZr0.8−xCexY0.2O3−δ (BZCY20), BaZr0.8Y0.2−xYbxO3−δ (BZYYb), BaZr0.1Ce0.7Y0.2−xYbxO3−δ (BZCYYb) and BaCe0.8Y0.2−xYbxO3−δ (BCYYb), at 600, 650 and 700 °C. For BZCY20, the ionic conductivity decreases on replacing Zr in BZY20 with x = 0.1 of Ce, increases with increasing Ce content within x = 0.1–0.5, and decreases on further increasing Ce content from x = 0.5 to 0.8. The ionic transport number increases with increasing Ce content. The ionic conductivity, partial conductivity of oxide ions and hole conductivity of BZCYYb and BCYYb increase with increasing Yb content. Since the increment of hole conductivity is larger, the ionic transport number decreases. For BZYYb, the ionic conductivity decreases and the hole conductivity increases with increasing Yb content, leading to decreasing ionic transport number. Both the high ionic conductivity and transport number are vital factors governing the performance of protonic ceramic cells (PCCs). Therefore, the improved performance of PCCs by adding both Y and Yb into the electrolyte cannot be explained from the viewpoint of electrical properties of the electrolytes. Thereby, we summarized our recent series of studies on the chemical compatibility between the electrolyte and NiO negatrode substrate, and suggested that the loss of dopant was suppressed by partly replacing Y with Yb. The high ionic conduction of the electrolyte can be maintained after co-sintering at high temperature to fabricate PCCs. This might be the real reason for the high performance of the devices using Y and Yb co-substituted electrolytes, prepared by the co-sintering method.
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NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Jiming Wang,Min Ji,Min Wang
The integration of photocatalysis and thermal catalysis offers a sustainable route to drive the dry reforming of methane (DRM) at low temperatures, addressing the high energy consumption of traditional thermocatalytic processes. Herein, we systematically explore the effects of doping rare earth elements (Ce, Pr, and Y) on the photothermal catalytic activity and stability of Ni-based catalysts (Ni–MOx–Al2O3) for DRM. Results demonstrate that Ce doping significantly enhances charge carrier separation efficiency and reduces interfacial impedance, endowing Ni–Ce–Al with superior photocatalytic activity compared to Ni–Pr–Al and Ni–Y–Al catalysts. After 100 h of continuous reaction at 650 °C, the conversions of CH4 and CO2 only decrease from 59.0% and 62.0% to 52.6% and 56.8%, respectively. Mechanistic studies reveal that Ce incorporation increases the density of surface oxygen vacancies, which promotes the activation of CH4 and CO2 and enhances coke resistance under light conditions. Kinetic analysis confirms that Ni–Ce–Al possesses the lowest activation energies for CH4 (40.6 kJ mol−1) and CO2 (36.7 kJ mol−1) dissociation under illumination. This work provides helpful guidance for the design of high-performance Ni-based photothermal catalysts for DRM through rare earth modification, highlighting the crucial role of Ce in optimizing electronic properties and anti-coking ability.
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Yaxin Li,Shuqi Wang,Guanghui Chen,Shiwen Wu,Shuzhen Zheng,Hongzhi Lu,Shoufang Xu
Zn/Ce-MOF integrates fluorescence, oxidase-like and apparent hydrolase-like behavior. • Ratiometric sensing enables signal self-calibration. • Smartphone RGB signals reveal distinct response patterns for five OP standards. The widespread residue of highly toxic organophosphorus pesticides (OPs) poses a serious threat to food safety and human health, underscoring the need for sensitive screening methods. In this work, a ratiometric fluorescence sensor array was constructed based on a trifunctional Zn/Ce-MOF exhibiting intrinsic blue fluorescence, oxidase-like activity, and apparent phosphoester hydrolase-like behavior. LC–HRMS full-scan analysis further showed DDV signal depletion accompanied by a marked increase in a DMP-assigned signal after 90 min. Ce sites promoted o -phenylenediamine (OPD) oxidation to produce yellow-fluorescent 2,3-diaminophenazine (DAP), which attenuated the intrinsic fluorescence through the inner filter effect. Upon addition of OPs, the DAP-associated emission decreased while the intrinsic fluorescence of Zn/Ce-MOF recovered, resulting in a ratiometric response (F 565 /F 440 ). Meanwhile, the fluorescence variation enabled visible color changes and smartphone-assisted signal acquisition based on red, green, and blue (RGB) analysis. The proposed sensor exhibited two linear response regions toward DDV over the final concentration ranges of 0–5 and 5–30 μg/mL, with a detection limit of 0.043 μg/mL. The sensing platform was preliminarily evaluated through post-extraction matrix-spike experiments for DDV in tenfold-diluted tomato and spinach extracts, yielding post-extraction matrix-spike recoveries of 93.5–121.5%. Multivariate analysis of F 565 /F 440 , G/B, and R/G signals revealed characteristic distribution, separation, and clustering patterns for five OP standards, including dichlorvos (DDV), dimethoate (DM), chlorpyrifos (CPF), methyl parathion (MP), and trichlorfon (TCF), in standard solutions. The study therefore provides a Zn/Ce-MOF-based strategy for smartphone-assisted DDV screening in tenfold-diluted tomato and spinach extracts and multichannel response-pattern analysis of five OP standards under controlled conditions. Further studies will evaluate the applicability of the multichannel response patterns to multiple OPs in complex food matrices. Illustration of the working principle and application of the Zn/Ce-MOF ratiometric fluorescent probe for OPs detection: (A) Synthesis of Zn/Ce-MOF. (B) Proposed mechanism of Zn/Ce-MOF-mediated OP transformation and fluorescence regulation. (C) Integrated smartphone RGB acquisition and multivariate response-pattern analysis of OP standards. Download: Download high-res image (228KB) Download: Download full-size image
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Foods
·
2026
·Vol. 15
·期 8
·1391
·
IF 6
Luyang Zhao,Yang Song,Guoyang Xie,Hengyi Xu
Sensitive detection ofEscherichia coliO157:H7 (E. coliO157:H7) in food matrices remains an important analytical challenge. Here, a colorimetric biosensor was constructed based on a bimetal oxide nanozyme composed of Ce-Fe oxide. This biosensor achieved sensitive detection ofE. coliO157:H7. The Ce-Fe oxide synthesized on the basis of deep eutectic solvents (DESs) had the advantages of low solvent consumption and short preparation time. By regulating the two key factors of metal valence and oxygen vacancy content, the peroxidase (POD) activity of the nanozyme was significantly improved. Compared with the single-metal oxide nanozyme Fe oxide, the addition of Ce increased the Fe2+/Fe3+ratio from 0.37 to 0.49, implying a possible enhancement of electron transfer between Fe2+and Fe3+. The detection limits (LODs) of the biosensor based on Fe oxide and that based on Ce-Fe oxide were 102CFU/mL and 101CFU/mL, respectively, comparable to existing validated methods. Moreover, these two biosensors achieved satisfactory recovery rates (91–104%) and RSDs (1.2–8.8%) in the spiked lake water, juice, and lettuce samples ofE. coliO157:H7, indicating their high potential for application in spiked sample detection. In summary, the method proposed in this study for improving the POD activity of nanozymes through electron transfer in DES solutions is beneficial to the development of metal oxide nanozymes.
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高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2026
·
IF 6.5
Yanni Liu,Dong Shen,Jun Liu,Yuqiong Zhao,Guojie Zhang
Dry reforming of methane (DRM) is a promising route for the simultaneous utilization of CH 4 and CO 2 to produce syngas, yet the development of efficient and stable catalysts for low-temperature DRM remains highly challenging. In this work, a series of Co/CeO 2 catalysts with morphology-controlled ceria supports were prepared to investigate the structure–performance relationship in DRM. Among them, the catalyst supported on CeO 2 nanorods (Co/CeO 2 -R) exhibited the best catalytic activity and stability at 600 °C. Structural characterization suggests that the CeO 2 -R support provides a higher surface area and defect density, which favors Co dispersion and the formation of Co-O-Ce interfacial structures. Raman, XPS, and H 2 -TPR results indicate that Co/CeO 2 -R possesses a higher concentration of oxygen vacancies and stronger interfacial interactions compared with other catalysts. CO 2 -TPD measurements further show enhanced CO 2 adsorption capacity, which is consistent with the increased density of defect sites. The results collectively suggest that the improved catalytic performance originates from the synergistic effect of Co dispersion, oxygen vacancies, and Co-O-Ce interfacial structures, which together promote CO 2 activation, oxygen transfer, and carbon removal. In situ DRIFTS results suggest a bifunctional reaction pathway, in which CH 4 activation is likely to occur on Co sites, while CO 2 is activated on defect-rich CeO 2 surfaces to form carbonate/formate species that may participate in carbon removal. Overall, this work establishes a structure-performance correlation between CeO 2 morphology and catalytic behavior, providing insights into the design of Co-based catalysts for low-temperature DRM.
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Journal of the Taiwan Institute of Chemical Engineers
·
2026
·
IF 6.9
Bing Bao,Rui Zhao,Yuhan Cheng,Manli Sun,Hong Li,Wei Ding,Huaili Zheng
Background Excess phosphorus in aquatic environments causes eutrophication. Low-valence inorganic and dissolved organic phosphorus are harder to remove than orthophosphate. These species usually require oxidation before separation, whereas oxidation alone cannot reduce total phosphorus (TP), resulting in multi-stage treatment processes. Methods This study explores a waste-derived cerium-modified CoFe 2 O 4 @biochar composite (ECB) prepared from crab shells for synchronous oxidation and adsorption of phosphorus species in water. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were conducted for material characterization. Electron spin resonance (ESR) and radical quenching tests were used to identify reactive oxygen species. Significant findings The ECB/peroxymonosulfate (PMS) system removed 95.6% of P(III) within 30 min at neutral pH, reducing residual TP below 0.5 mg/L. PMS addition accelerated phosphorus removal by oxidizing P(III) to phosphate, which was captured by surface cerium-containing sites. The adsorption followed pseudo-first-order kinetics. Mechanistic results showed CoFe 2 O 4 @biochar activated PMS to generate SO 4 •− as the main reactive species, and electrostatic interaction and ligand exchange were responsible for phosphate capture. The ECB/PMS system was effective for dissolved organic phosphonates and exhibited magnetic separability, reusability, and low metal leaching. This research presents an efficient one-step strategy for phosphorus control and recovery, supporting cleaner production and circular utilization of crab shell waste.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Dongying Yan,Ruilin Feng,Yanlong Qi,Chenxi Bai
Selective synthesis of 1,3-pentadiene without 1,4-pentadiene formation is challenging as well as rewarding because of the widespread use of 1,3-pentadiene in adhesive, paint, and curing agent production. Herein, modified K–Ce/ZrSi catalysts with acid–base sites were synthesized for the production of 1,3-pentadiene from 1,4-pentanediol. The overall 1,3-pentadiene yield was 74.7%, while the 1,4-pentadiene yield was 1.3%. On the catalyst, two parallel routes (direct dehydration and dehydra-decyclization) for the conversion of 1,4-pentanediol to 1,3-pentadiene were disclosed. The 4-position hydroxyl group was first activated and then eliminated on the acid sites. It was considered that the acid–base sites of catalysts exhibited a synergistic effect for the selective dehydration of 1,4-pentanediol to 1,3-pentadiene, where the medium strength Lewis acid sites and weak base sites were responsible for the elimination of the hydroxyl group and the corresponding β1-H, thereby inhibiting the formation of 1,4-pentadiene. Furthermore, a plausible reaction network was proposed.
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POLYMER COMPOSITES
·
2023
·
IF 5.2
Yi Li,Ning Zhang,Jicai Liang,Kaifeng Yu,Zengxia Zhao,Ce Liang
Composites with good thermomechanical and UV-shielding properties are essential in fiber-reinforced composites. This paper focuses on composites' ultraviolet (UV) shielding efficiency with added Ce-Zr-Si oxide nanoparticles/epoxy resin. The Ce-Zr oxide nanoparticles were first functionalized with a silicon coupling agent and ethyl silicate to improve their dispersion and surface activity. In this work, we prepared epoxy nanocomposites with the addition of Ce-Zr -Si oxides(1,3,5,7 wt%) and found that the materials had good enhancement of the UV shielding properties of the epoxy resin matrix. Meanwhile, it was used in basalt fiber (BF)/epoxy composites prepared by the hot-pressing method, and surface treatment of basalt fibers was carried out. The results showed that the modified fiber composites could effectively enhance the thermomechanical properties of epoxy resin composites. It is noteworthy that the tensile strength and flexural strength of the hybrid composites reached their peak when 5 wt% Ce-Zr-Si was added, increasing by 13.8% and 33.67% respectively. The modified (BF)/epoxy composites exhibited improved thermal stability compared to pure epoxy resin, with the maximum weight loss temperature of BF-1/EP reaching 349°C. The T(UVA) decreased to 2.41%, while the T(UVB) decreased to 0.053%, and almost all the ultraviolet irradiation was blocked. These results show that our prepared composites have good thermomechanical and UV shielding properties. Highlights Ce-Zr oxide nanoparticles were functionalized with a silicon coupling agent. Ce-Zr-Si oxide was added to enhance the ultraviolet shielding efficiency. Modified BFs were composited to improve thermomechanical properties.
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JOURNAL OF THE ENERGY INSTITUTE
·
2022
·
IF 6.47
Kai Shi,Xia An,Yali Du,Zhaoyang Fan,Xu Wu,Xianmei Xie
A series of nickel catalysts supported on Al 2 O 3 that modified with Ce-, Zr-, and Mg-promoter were prepared via a sol-gel method and a subsequent impregnation method for the ethanol steam reforming reaction (ESR). The effect of promoters on the carbon deposition was focused. Compared with Ni/Al 2 O 3 catalyst, the introduction of different promoters decreased the selectivity for CH 2 CH 2 to different extent, especially, Ce-, Mg- containing catalysts completely suppressed the production of CH 2 CH 2 for 30 h tested at 500 °C. And the medium and strong acid sites were confirmed as the major sites for CH 2 CH 2 production. Encapsulation carbon derived from ethylene takes the primary responsibility for carbon deposition, and the formation of metal carbide is the other reason for causing carbon deposition. Among the tested catalysts, Ni/Mg–Al 2 O 3 exhibited a better performance for anti-carbon, which was attributed to the blockage of medium and strong acid sites as well as the high Ni crystallinity .
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ACS ES&T Engineering
·
2022
·
IF 0
Yaoyu Zhang,Yuxiong Wang,Yue Liu,Huimin Xu,Qingji Ying,Zhongbiao Wu
Cerium-modified Cu/ZSM-5 catalysts were employed for the selective catalytic combustion of acetonitrile. It was obtained that cerium addition effectively improved the mineralization rate of acetonitrile and nitrogen selectivity as well. The optimal Cu5Ce8/ZSM-5 sample exhibited 100% mineralization rate and higher than 95% nitrogen selectivity within 325–500 °C. The strong interaction between Cu and Ce species was induced in a core–shell-like structure of Cu–Ce/ZSM-5 samples, where the Cu–Ce/ZSM-5 core was wrapped with a Cu–Ce mixed oxide layer. The external mixed oxides exhibited enhanced reducibility and increased active oxygen species. In situ diffuse reflectance infrared Fourier transform spectroscopy and density functional theory simulations revealed that surface cerium species strengthened the hydrolysis reaction path of acetonitrile as ceria could effectively promote the dissociation of water and the hydrolysis of cyano groups, thereby generating a sufficient amount of NHx species. As a result, the NOx from acetonitrile overoxidation would be eliminated through internal selectivity catalytic reduction over the Cu–Ce/ZSM-5 core.
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Nuclear Engineering and Technology
·
2022
·
IF 2.817
Yan Wang,Jin Wang,Xue Zhang,Nan Li,Junxia Wang,Xiaofeng Liang
Series of unequal quantity Nd/Ce co-doped ceramic nuclear waste forms, (Gd, Nd) 2 (Zr, Ce) 2 O 7 , were prepared to tailor its ordered pyrochlore or disordered fluorite structure. The phase transition, microtopography, and elemental composition of the ceramic samples were systematically investigated, especially the effect of order-disorder structure on the chemical stability. It was confirmed that unequal quantity of Nd/Ce could synchronously replace the Gd/Zr-sites of Gd 2 Zr 2 O 7 . And the phase transition of order-disorder structure could be successfully tailored by regulating the average cationic radius ratio of (Gd, Nd) 2 (Zr, Ce) 2 O 7 series. The elements of Gd, Nd, Zr, and Ce are uniformly distributed in the ordered or disordered structures. The MCC-1 leaching results showed that (Gd, Nd) 2 (Zr, Ce) 2 O 7 pyrochlore ceramic nuclear waste forms had excellent chemical stability, whose elements' normalized leaching rates were as low as 10 −4 -10 −7 g‧m −2 ‧d −1 after 7 days. In particular, the chemical stability of disordered structure was superior to that of ordered structure. It was proposed that the force constant and the closest packing were changed with the structure transformation resulting the chemical stability difference.
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