JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 17
·e53788
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IF 3
Lei Jiang,Chengkun Wu,Lu Yao,Qiuxia Dong,Guohua Wu
Regenerated silk fibroin (RSF) fibers have great application prospects in medicine, textiles, optoelectronics, and other fields. However, under the synergistic action of ultraviolet, oxygen, and water, RSF will inevitably become brittle, which will greatly shorten the service life of RSF. Therefore, it is urgent to find some methods to protect RSF from aging damage. Cerium dioxide nanoparticles have a strong ultraviolet absorption and antioxidant capacity and have been used as an anti-aging component for other biomaterials. Thus, the RSF/CeO 2 NPs hybrid fibers were successfully prepared, and a series of artificial aging tests were carried out. Mechanical property is an important index to measure the aging degree. After aging, compared with RSF, the stress of RSF/CeO 2 NPs hybrid fibers was increased by 130.47 ± 4.78 MPa, and the strain of RSF/CeO 2 NPs hybrid fibers was increased by 69.89% ± 1.37%. The results of Fourier transform infrared spectroscopy, UV–Vis, sodium dodecyl sulfate polyacrylamide gel electrophoresis discussed the protective mechanism of CeO 2 NPs, which prevent the transition from β-sheet to α-helix/random coil and the disorder of structure. Furthermore, RSF/CeO 2 NPs hybrid fibers have an excellent antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria; the antioxidant activity of RSF/CeO 2 NPs hybrid fibers is gradually enhanced in the presence of UV-light.
研究领域:
材料科学
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生物医学工程
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高分子化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Zhidong Xia,Bin Meng,Heng Zhang,Qian Zheng,Wenke Liang,Xinyu Ping
Ce 0.8 Sm 0.2 O 1.9 (SDC)-xMgO (x = 0, 5, 10, 15, and 20 mol%) composite powders were synthesized by a sol-gel method and then densified by spark plasma sintering (SPS) to investigate the effects of MgO additions on the electrical conduction behavior of CeO 2 -based ceramics. The microstructure and electrical performances of the SDC-MgO composite ceramics were characterized and measured by XRD , SEM, TEM, EDS and EIS . Results show that the second phase of MgO segregates at the grain boundaries of SDC when its content is higher than 5 mol% in the ceramics. The SPS process accelerates the formation of MgO lamellar grains with incomplete crystallization. As the MgO content rises from 0 to 20 mol%, the grain boundary and total electrical conductivities first increase and then decrease, and the SDC-5%MgO sample exhibits the highest total conductivity, i.e., 2.76 × 10 −2 S/cm at 650 ° C, which is 9.65% higher than that of pure SDC.
研究领域:
材料科学
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电化学
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DOI
高影响因子
CATALYSIS LETTERS
·
2025
·Vol. 155
·期 6
·1-17
·
IF 2.4
Sun Ran,Hou Kunge,Jin Xingpeng,Yang Lihui,Song Lijie,Ouyang Chuang,Hou Jianyuan,Yuan Yuan,Liu Xingang,Zhang Renxi
The development of new technologies for removal of NO and chlorobenzene in complex flue gas situations at low temperature is a complex and demanding task. Here, the synergistic removal of NO and chlorobenzene was achieved through catalysis assisted dielectric barrier discharge (DBD) mechanism under different conditions. The experimental results suggested that the increase of specific energy density (SED) and the loading of CeO 2 strengthened the treatment of NO and chlorobenzene. A higher degradation efficiency of NO and a lower production rate of NO 2 were achieved after the introduction of chlorobenzene. The removal of chlorobenzene could also be benefited from this process, and the introduction of NO promoted CO 2 selectivity of chlorobenzene. The XPS and H 2 -TPR analyses confirmed that the reaction between chlorobenzene and NO occurred by the assistance of Ce 3+ /Ce 4+ redox cycle as well as the consumption and regeneration of chemically adsorbed oxygen. During the reaction, the oxygen vacancies (OVs) caused by plasma etching promote the redox cycle and alleviate the catalyst poisoning caused by chloride ions (Cl − ). Furthermore, a comprehensive analysis of the resulting byproducts revealed phenol as the most significant intermediate in chlorobenzene degradation, while acetaldehyde emerged as the major product resulting from ring-opening processes of chlorobenzene. Utilizing chlorobenzene from flue gas subtly, this method presents a more sustainable alternative for NO reduction, showing promise for addressing industrial emission challenges. Graphical
研究领域:
环境科学
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催化化学
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DOI
高影响因子
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
·
2025
·
IF 7.5
Fukun Li,Yang Bai,HaiXiang Hu,Guanbo Qiao,Lingzhong Li,Feng Zhang,Xuejun Zhang
Achieving atomic-level surface integrity while maintaining a high material removal rate (MRR) remains a fundamental challenge in the polishing of fused silica due to its high hardness and brittleness. This study establishes a novel mechanistic framework for understanding how pH-driven interfacial bond dynamics govern chemo-mechanical polishing processes. By integrating multiscale experimental characterization (XPS, FTIR, Raman spectroscopy) with ReaxFF molecular dynamics simulations, we demonstrate for the first time that the dynamic equilibrium between the formation and rupture of Ce–O–Si interfacial bonds directly control removal efficiency and surface quality. Alkaline conditions enhance OH – activity, facilitating Si–O bond hydrolysis and stable Ce–O–Si linkage formation, resulting in the highest MRR (397.6 nm/min). Acidic environments promote citrate-mediated Ce 3 + complexation and nanocluster dispersion, enabling a rolling mechanism that achieves ultra-smooth surfaces (Sq = 0.086 nm). In contrast, neutral pH conditions suffer from PEG adsorption blocking active sites, leading to a 62 % reduction in MRR relative to alkaline systems. A 12.2-fold increase in MRR compared to SiO 2 abrasives (32.67 nm/min) confirms that chemical interfacial dynamics, rather than mechanical abrasion alone, are critical to material removal. This fundamental advancement provides a broadly generalizable theoretical basis for designing efficient, low-damage precision polishing processes across oxide-based optical materials and beyond.
研究领域:
材料科学
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化学工程
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光学材料加工
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Jiyou Shen,Jun Shen,Wenjing Zhang,Xiaohui Yu,Hua Tang,Mingyi Zhang,Zulfiqar,Qinqin Liu
Ti 3 C 2 -MXene, which exhibits excellent electronic conductivity and optical properties , has been identified as a promising noble-metal-free co-catalyst for the development of efficient photocatalysts for environmental remediation. Herein, CeO 2 /Ti 3 C 2 -MXene hybrids were prepared by the in-situ growth of cube-like CeO 2 using ultrathin Ti 3 C 2 -MXene nanosheets as a two-dimensional platform via a simple hydrothermal route. Upon exposure to solar light, the CeO 2 /Ti 3 C 2 -MXene hybrid with the optimal ratio of Ti 3 C 2 -MXene exhibited enhanced performance in photocatalytic tetracycline degradation and CO 2 reduction, with activities 6.3 and 1.5 times greater than those of pristine CeO 2 , respectively. The improved activity of CeO 2 /Ti 3 C 2 -MXene was attributed to the Schottky junction induced by the built-in electric field between CeO 2 and Ti 3 C 2 -MXene, which drives the photogenerated electrons from CeO 2 to Ti 3 C 2 -MXene and expedites the segregation of the electrons and holes. This work may shed light on the careful design of novel Schottky junctions utilizing noble-metal free Ti 3 C 2 -MXene as co-catalysts for building efficient photocatalytic systems enacted in pollutant degradation and energy conversion.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 31
·25877-25881
·
IF 3.289
Ling Li,Mingkun Wang,Ning Cui,Yuedi Ding,Qingling Feng,Wenming Zhang,Xiaowei Li
Incorporation of nanophase ceria into the cathode catalyst Pt/C was used as alternative cathode catalysts for the oxygen reduction reaction in an air-cathode single-chamber microbial fuel cell (SCMFC) for the first time. Electrochemical results reveal that the ceria doped Pt/C catalysts exhibited a higher catalytic performance than the pure Pt/C catalyst. The highest voltage of 580 mV and the maximum power density of 840 ± 24 mW m−2 were achieved from the 3 wt% CeO2 doped Pt/C cathode, which was larger than that of the pure Pt/C cathode.
研究领域:
环境科学
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电化学
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能源材料
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Weiyuan Yao,Xiaoqiang Wang,Yue Liu,Zhongbiao Wu
In this paper, Ce O P material (mainly consisted of CePO 4 ) and TiO 2 supported CeO 2 catalysts were prepared by wet impregnation route for the selective catalytic reduction (SCR) of NO with NH 3 . The SCR activity results had revealed that CeO 2 /Ce O P-0.4 catalyst yielded over than 90% NO conversion within the temperature range of 200–300 °C, whereas the deNO x efficiency of CeO 2 /TiO 2 -0.4 catalyst was less than 30% at 200 °C. After a series of characterization tests, it was found that CeO 2 /Ce O P catalysts were of better dispersion of active phase than CeO 2 /TiO 2 owing to the strong interactions between CeO 2 and surficial Ce O species on Ce O P material. Thus, more active oxygen species could participate in the SCR reaction at low temperature. Furthermore, compared to CeO 2 /TiO 2 sample, the surface acidity was greatly enhanced for CeO 2 /Ce O P catalysts by the introduction of the acidic support, benefiting the adsorption of NH 3 . Both of which were attributed to the main reasons of the promoted SCR performance over CeO 2 /Ce O P catalysts. Moreover, the NO x ad-species on CeO 2 /TiO 2 sample were very stable and could hardly react with adsorbed NH 3 , impeding L-H reaction pathway at low temperature.
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 LETTERS
·
2023
·
IF 2.8
Chen Yao,Li Shuyue,Li Yuchao,Zheng Yanxia,Zuo Cuncun,Ge Tingting,Xu Rui,Huang Haofei,An Jiutao
Nano-Au particles are commonly used as an active component in oxidation esterification reactions. To inhibit the agglomeration of nano-Au particles, a series of highly stable Au@CeO 2 /MnO x core–shell structured catalysts were synthesized using inverse microemulsion technology for the oxidative esterification to prepare methyl methacrylate (MMA). The core–shell structured catalysts were prepared by using two different surfactants (CTAB and CO-520) and adjusting the molar ratio of water to oil (ω). XRD, Raman, N 2 adsorption, ICP−MS, TEM, UV–vis, FT-IR, XPS, and H 2 -TPR were applied to characterize the samples. The nano-Au particles were encapsulated by CeO 2 , forming a core–shell structure confirmed with TEM. The Au@CeO 2 /MnO x -C-ω = 10 catalyst prepared with CTAB as the surfactant has the best activity. The Au@CeO 2 /MnO x -C-ω = 10 catalyst has the highest hydrogen consumption and Ce 3+ content, indicating that the catalyst has the strongest interaction among Ce, Au, and Mn and more active oxygen. Active oxygen is beneficial to methanol activation and hemiacetal dehydrogenation, accelerating the formation of esters. The active oxygen content, Ce 3+ content, and H 2 consumption were correlated with the catalytic performance positively. After the catalyst was reused 10 times, the activity remained unchanged and the Au nanoparticles did not agglomerate due to the core–shell structure. Graphical Abstract
研究领域:
催化化学
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jingheng Gao,Yifei Xiong,Qian Zhang,Yiwen Jiang,Jing Wang,Sibei Zou,Mingli Fu,Junliang Wu,Yun Hu,Daiqi Ye
MnO x -CeO 2 composite catalysts have attracted interest from all over the world as promising catalysts for carbon black oxidation. The contact between carbon black and catalyst, and the surface physicochemical properties of the catalyst, are the main factors in carbon black oxidation, while the contact is a basic one affecting the ignition of the oxidation. In this work, MnO x -CeO 2 catalysts with different geometric morphologies (nanorod and nanoparticle) are prepared to determine the effect of geometric morphology on the contact probability between catalysts and carbon black. Compared with the nanorod catalyst, nanoparticle catalyst is significantly advanced in catalytic activity (T 10 = 314 °C, T 50 = 346 °C, T 90 = 383 °C) and relative contact probability (9.549, compared to the 7.639 of nanorod catalyst, according to the 3D geometric modeling). O 2 -TPD, H 2 -TPR, and In-situ UV Raman experiments reveal that the concentration of surface intrinsic oxygen vacancy of the two catalysts are approximative. The consumption of oxygen vacancy is based on the active sites provided, which is relative to the morphology. The better consumption results in better utilization of intrinsic active oxygen species in nanoparticle sample. This finding proves the correlation between contact probability and carbon black catalytic activity, and witnesses that the consumption efficiency of surface intrinsic oxygen vacancy is an initial factor in carbon black oxidation.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 8
·e202404358
·
IF 2
Yuanpei Lan,Zhou Zou,Shuang Liu,Arun Murali,Baolei Wang,Qingwei Jia,Shirong Wang
Graphical A series of Fe 2 O 3 ─CeO 2 ─C 3 N 4 (Fe–Ce–CN) catalysts were synthesized by a KCl–LiCl molten salt method. The 0.5 wt.% Fe 2 O 3 loaded Fe–Ce–CN which synthesized at 550 °C for 4 h had an excellent photocatalytic activity towards to tetracycline (TC) degradation due to the significantly boosted separation efficiency of photoexcited electron-hole pairs. In this work, Fe 2 O 3 ─CeO 2 ─C 3 N 4 (Fe–Ce–CN) catalysts were synthesized in the KCl–LiCl molten salt system, and their photocatalytic properties towards tetracycline (TC) degradation in wastewater were studied. The obtained 0.5 wt.% Fe–Ce–CN, synthesized at 550 °C for 4 h with 0.5 wt.% Fe 2 O 3 , had the highest photocatalytic degradation efficiency for tetracycline (TC), which achieved degradation ratios of 98.3% and 96.9% for TC solutions at concentrations of 20 mg/L and 80 mg/L, respectively. Characterizations indicated that the 0.5 wt.% Fe–Ce–CN had significantly enhanced photo-excited electron-hole separation efficiency and promoted photocatalytic activity. Additionally, superoxide radicals · O 2 − and electrons ( e − ) were identified as the key reactive species for TC degradation with 0.5 wt.% Fe–Ce–CN, attributing to its band structure. The possible enhancement mechanism was discussed and proposed. The findings in this work provide a new approach to preparing high-performance photocatalysts and offer insights into the Fe–Ce–CN ternary photocatalysts.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Materials Research Express
·
2024
·Vol. 11
·期 7
·075101
·
IF 1.8
Lina Zhan,Yao Zhang,Xuan Zhang,Yuzhibiao Xia,Yao Liu
The densification mechanism of CeO2 doped Si3N4 ceramics during spark plasma sintering (SPS) was investigated. The sintering process was observed to undergo significant densification at the intermediate stage of sintering (1435 °C–1816 °C), and the density and grain size of CeO2 doped Si3N4 ceramic were found to be greater than those of pure Si3N4 ceramic under the same sintering conditions. To determine the densification mechanism, a creep model was utilized to determine the densification mechanism which could be interpreted based on the values of the stress exponent (n) and the apparent activation energy (Qd). The results revealed that the Qd of pure Si3N4 (381.15 kJ mol−1) is higher than that of Si3N4-CeO2 powder (265.61 kJ mol−1). Moreover, the stress exponent n of Si3N4-CeO2 powder (1.12–1.33) was higher than that of pure Si3N4 powder (1.00–1.18). This can be attributed to the fact that the addition of CeO2 resulted in the formation of a liquid phase at the grain boundary which leading to a shift in the controlling mechanism from grain boundary diffusion to grain boundary sliding.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 7
·2144-2152
·
IF 3.186
Guo Yu,Tian Long,Yan Wangwei,Qi Ronghua,Tu Weixia,Wang Zhou-jun
Abstract Three typical methods, subsequent coating, co-impregnation and sequential impregnation, were employed to investigate the effect of introduction methodologies for CeO 2 -promoted Ni/SiO 2 catalysts. The CeO 2 @Ni/SiO 2 catalyst prepared with the subsequent coating method was found to exhibit the best initial activity and superior long-term stability in CO 2 reforming of methane. Comparative characterizations documented that small Ni size and intimate Ni–CeO 2 contact were generated on the CeO 2 @Ni/SiO 2 catalyst, leading to excellent reforming activity. In addition, pronounced redox property and strong surface basicity were created on the CeO 2 @Ni/SiO 2 catalyst, resulting in exceptional coke resistance and thus superior long-term stability. This work unravels the impact of various introduction methods on the catalyst structure, which would help design robust nanocomposite catalysts with outstanding catalytic performance. Graphic Abstract
研究领域:
催化化学
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材料科学
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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）