SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Xiangchuan Wu,Jinhui Wei,Chengyuan Wu,Guangping lv,Lina Wu
In the present work, we synthesized ZrO 2 /CeO 2 /polyacrylic acid (PAA) nanocomposites (nanozyme) with phosphatase-like activity. ZrO 2 evenly distributed in CeO 2 nanorods considered as lewis acids to enhance the phosphatase-like activity of CeO 2 nanorods. Furthermore, PAA was used to coat ZrO 2 /CeO 2 / nanorods and improve the dispersion, stability and robustness. The ZrO 2 /CeO 2 /PAA nanocomposites had 100% enhanced phosphatase-like activity compared with CeO 2 nanorods and excellent adaptability in a wide pH range from 4.0 to 12.0. ZrO 2 /CeO 2 /PAA nanocomposites could hydrolyze methyl parathion (MP) to p -nitrophenol ( p -NP) with bright yellow color for colorimetric detection. The developed colorimetric detection system showed a linear response from 7.60 × 10 -11 -7.60 × 10 -8 M with a detection limit of 0.021 nM and was successfully applied for the determination of MP in corn samples.
研究领域:
生物化学
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纳米材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Hanzhen Xiong,Xiaoyan He,Tong Lou,Xiuqin Bai
Cerium oxide (CeO 2 ), with haloperoxidase mimic activity, has attracted attention because it can break through many limitations of biological enzymes as a green and efficient antibacterial agent. However, low Ce 3+ concentration in CeO 2 restricts the activities of haloperoxidase mimicry, which hinders its application. Here, CeO 2 was loaded onto carbon nanotubes (CNTs), where dopamine hydrochloride (DA) was polymerized as the "linker" and CNTs the "skeleton." Two types of samples, termed CeO 2 -CNT (CeO 2 49@PDA/CNT and CeO 2 77@PDA/CNT), were prepared and CeO 2 was found to be uniformly distributed on CNTs, and their Ce 3+ and oxygen (O) vacancy concentrations analyzed. CeO 2 77@PDA/CNT, with the higher Ce 3+ and O vacancy concentration, showed excellent antibacterial performance, up to 98.03%. This study demonstrated a method for enhancing the activities of haloperoxidase mimicry and antibacterial performance of CeO 2 with CNTs as the skeleton.
研究领域:
纳米技术
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材料科学
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生物医学工程
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化学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2024
·Vol. 16
·期 1
·1-21
·
IF 31.6
Zhou Xi,Zhou Quan,He Zhaozhi,Xiao Yi,Liu Yan,Huang Zhuohang,Sun Yaoji,Wang Jiawei,Zhao Zhengdong,Liu Xiaozhou,Zhou Bin,Ren Lei,Sun Yu,Chen Zhiwei,Zhang Xingcai
The innovation of this work mainly lies in the auto-regulation of reactive oxygen species (ROS) balance effective by combination of ROS antibacterial and ROS scavenging anti-inflammatory functions with a core–shell nanoplatform (CeO 2 @ZIF-8/Au), which can not only achieve high antibacterial efficiency, but also promote wound healing, and provide a new idea for the nano-catalytic system in the field of wound healing of bacterial infection.
研究领域:
纳米技术
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材料科学
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生物医学工程
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伤口愈合
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Chao Peng,Guoqing Yang,Hanqing Ge,Zhongwen Liu
The oxidative dehydrogenation of propane with carbon dioxide (CO 2 -ODP) has received significant attention as an environmentally benign route for the propene production. However, the development of high-performance catalysts remains a critical challenge hindering its industrial implementation. In this work, CeO 2 samples with distinct morphologies resembling flowers (F-CeO 2 ), rods (R-CeO 2 ), spindles (SP-CeO 2 ), and sheets (SH-CeO 2 ) were successfully synthesized by simply changing the hydrothermal conditions, and the shape-dependent impact of oxygen-defect contents over CeO 2 on the structural and electronic properties of the impregnated PtSn/CeO 2 catalysts was studied for CO 2 -ODP. Characterizations reveal a positive correlation between the Pt electron density and oxygen-defect contents in an increasing order of PtSn/F-CeO 2 < PtSn/R-CeO 2 < PtSn/SP-CeO 2 < PtSn/SH-CeO 2 . In the case of the catalytic results, the same changing pattern is observed for the initial C 3 H 8 conversion and C 3 H 6 selectivity. Moreover, the highest initial propene space-time yield of 0.71 achieving over the PtSn/SH-CeO 2 catalyst is still retained at 0.35 after a time on stream of 200 min. This performance surpasses those of most reported CO 2 -ODP catalysts. The morphology-dependent catalytic phenomena are attributed mainly to the varied activation energies of CO 2 -ODP, which are determined by the oxygen defect-induced electronic and structural interplay between Pt, Sn, and CeO 2 . These findings provide valuable insights for the rational design and optimization of Pt-based catalysts for CO 2 -ODP, particularly in the selection of oxide supports.
研究领域:
催化化学
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材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
KINETICS AND CATALYSIS
·
2018
·Vol. 58
·期 6
·800-808
·
IF 0.926
Tang Chengli,Liping Lv,Zhang Limei,Tan Luxi,Dong Lichun
Ni@CeO 2 core–shell catalysts were synthesized via a facile surfactant-assisted hydrothermal method and their catalytic performance in the dry reforming of methane (DRM) reaction was evaluated. A variety of techniques including XRD, N 2 adsorption–desorption, SEM, TEM, TPO, TGA were employed to characterize the prepared or spent catalysts. The encapsulation by the CeO 2 shell, on one side, can restrict the sintering and growth of Ni nanoparticles under harsh reaction conditions. On the other side, compared to the conventional shell material of SiO 2 , CeO 2 can provide more lattice oxygens and vacancies, which is helpful to suppress coke deposition. Consequently, the Ni@CeO 2 core–shell catalysts exhibited better catalytic activity and stability in the DRM reaction with respect to the referenced Ni@SiO 2 core–shell catalysts and Ni/CeO 2 supported catalysts.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 4
·1727-1737
·
IF 3.442
Peng Guangchun,Qiao Qianqian,Jin Lei,Zhang Bowei,Wang Yi,Huang Kang,Yao Qiong,Zhang Dongjiu,Zhang Zhan,Fang Tao,Wu Junsheng,He Yedong
A novel CeO 2 /MgAl 2 O 4 composite coating, fabricated via a cathode plasma electrolytic deposition (CPED) technique followed by hydrothermal synthesis, was developed in this study to explore its potential application as corrosion protection for AZ31 magnesium alloys. The microstructure observed through scanning electron microscopy indicated that reducing the duty cycle of the power source within a reasonable range during the CPED process was beneficial to form a uniform and dense MgAl 2 O 4 coating, which served as an ideal adhesive matrix for a uniform CeO 2 coating as the outermost layer. The results of electrochemical impedance spectra and neutral salt spray tests showed that the decoration of the CeO 2 layer significantly improved the corrosion resistance of the CeO 2 /MgAl 2 O 4 composite coating compared to the single MgAl 2 O 4 coating and bare substrate. Cross-cut tests revealed that the adhesion of the MgAl 2 O 4 coating and the CeO 2 /MgAl 2 O 4 composite coating were both excellent due to the strong binding between the MgAl 2 O 4 coating and the substrate.
研究领域:
材料科学
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表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
·
IF 3.8
Jie Zhou,Beibei Zhu,Lu Wang,Yan Bao,Guofeng Guan
Higher electron transfer efficiency is an important way to improve the activity of photocatalysts. A novel Z-scheme CdS/CeO 2 /g-C 3 N 4 nanocomposite was successfully synthesized by a solvothermal method, and its photocatalytic activity was evaluated by the degradation of phenol. The phase structure, morphology, surface structure, and atomic valence state of the as-obtained photocatalyst were characterized by XRD, SEM, TEM, FT-IR, XPS, and UV–Vis absorption spectroscopy, respectively. The CdS/CeO 2 /g-C 3 N 4 nanocomposite exhibited a remarkable photocatalytic activity and a rapid degradation ability for phenol with a degradation rate of 95 % in 180 min, which was considerably better than those of pure CeO 2 and CdS/CeO 2 under the same conditions, suggesting a synergistic effect in the nanocomposite. The enhancement of the photocatalysis ability of the nanocomposite is mainly attributed to the higher adsorption capacity of three-dimensional porous g-C 3 N 4 and the three-dimensional space electric field formed by its complex with CdS and CeO 2 . The three-dimensional porous structure is not only conducive to the efficient adsorption of pollutants but also provides active sites for photocatalytic reactions. The three-dimensional space and the network interconnection structure are conducive to the directional migration of photogenerated charges and increase the carrier lifetime. In brief, this work provides a new route to the design and synthesis of CdS/CeO 2 /g-C 3 N 4 for colorless organic pollutants photodegradation under visible light.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Fei Hong,Dongsen Mao,Tao Meng,Guisheng Wu,Haifang Mao,Jun Yu
The hydrogenation of carbon dioxide to produce high-value fuels such as ethanol is currently a research hotspot, but addressing the low selectivity for ethanol remains a challenge. Herein, morphology-controlled CeO 2 with different exposed crystal facets, including nanorods (220), nanocubes (200) and nanoplatelets (111), were prepared and impregnated with rhodium (Rh) to obtain Rh/CeO 2 catalysts, and then the catalytic performance of CO 2 hydrogenation was investigated. Rh/CeO 2 -r (nanorods) exhibits high efficacy for CO 2 hydrogenation to ethanol, giving a high ethanol selectivity of 20.9% with a moderate CO 2 conversion of 11.2%, and the one-pass ethanol productivity reaches 69.2 mmol/(g Rh ·h). Characterization results reveal that tuning the exposed crystal facets of the CeO 2 can tailor the interaction between Rh and CeO 2 , and adjust the chemical state of the Rh species. Due to the abundant oxygen vacancies occupied on the exposed (220) facets of CeO 2 nanorods, multi-level interactions arise between Rh and CeO 2 -r, and produce more content of Rh + species. This interface facilitates the transformation of carbonate species into HCOO* and CO* simultaneously, finally boosting the ethanol formation by the C−C coupling reaction.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·
IF 3.5
Xiaoyu Chu,Xinrui Wang,Shuo Tian,Yongkuo Zhao,Shikai Liu,Hong Yan,Yan Shang
Modulating the photogenerated electrons of CeO2 to activate O2 and efficiently photocatalytic degradation of chlorophenols is a highly desired goal. Herein, we have successfully fabricated FePc/CeO2 heterojunction through H-bond induced assembly. The photocatalytic degradation of 2, 4-DCP by the amount-optimized FePc/CeO2 nanocomposite was improved by 3 times compared with pure CeO2. By means of electron paramagnetic resonance (EPR) and single wavelength photocurrent spectroscopy, it is confirmed that the excellent photocatalytic performance is mainly attributed to the formation of Z-scheme heterojunction, which promotes charge separation and transfer, and the introduction of FePc broadens the visible light absorption range of heterojunction. Moreover, O2 temperature-programmed-desorbed curves and electrochemical O2 reduction measurements results demonstrate that the single Fe-N4(II) site in FePc is more conducive to promoting O2 activation than that of other metal phthalocyanines. Based on in situ FT-IR and liquid chromatography-tandem mass spectrometry (LC-MS), a possible reaction pathway of 2, 4-DCP degradation was proposed. This study provides a novel strategy to prepare CeO2 based Z-scheme heterojunctions with abundant monoatomic sites for pollutant degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Hua Chai,Ze Zhang,Jie Sun,Mingjun Zhong,Mengxue Liu,Jing Li,Zihao Chen,Beini Gong,Qiaoling Xu,Zhujian Huang,Lihua Cui
This research investigates the synergistic enhancement of semiconductor catalysts through the incorporation of carbon quantum dots (CQDs) within CeO 2 -Fe 3 O 4 Type-II heterojunction photocatalysts. Subsequent to the successful synthesis of these modified photocatalysts, a thorough assessment of their catalytic performance is conducted. Notably, the introduction of CQDs results in a 21% increase in pollutant degradation capacity compared to unmodified heterojunctions, with a remarkable removal efficiency of 96% for the target pollutant TC. Comprehensive analyses employing electrochemical impedance spectroscopy (EIS), UV–vis spectroscopy, and photocatalytic experiments provide substantial evidence for the efficacy of CQDs in enhancing light absorption properties within the CeO 2 -Fe 3 O 4 heterojunction. This enhancement is attributed to a notable suppression of electron-hole pair recombination, facilitating the generation of reactive oxygen species (ROS) such as ·O 2 - and ·OH. This, in turn, the promotion of Ce 4+ /Ce 3+ and Fe 3+ /Fe 2+ cycles takes place, collectively enhancing the responsiveness of the photocatalyst to visible light. The photocatalysts demonstrate enduring catalytic and magnetic stability over five cycles, as indicated by the sustained high-performance retention. Detailed analysis using TOF-LC-MS has revealed two highly efficient degradation pathways for the for the target pollutant. The findings contribute valuable insights for advancing the performance of heterojunction photocatalysts.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jing Wang,Xingyu Niu,Qi Hao,Kun Zhang,Xinyi Shi,Liping Yang,Hui Ying Yang,Jilei Ye,Yuping Wu
Low charge separation efficiency significantly hampers the performance of photocatalytic hydrogen production. Constructing heterojunctions emerges as a crucial strategy to enhance photocatalytic activity by improving charge separation. An S-scheme heterojunction not only effectively separates the photogenerated charge in composite photocatalysts but also preserves optimal redox capabilities. This study presents the first report of CuInS 2 /CeO 2 (CIS/CeO 2 ) and demonstrates how charge separation within CIS/CeO 2 to enhance photocatalytic hydrogen production through the construction of an S-scheme heterojunction. The UV–visible-driven hydrogen production rate of CIS/CeO 2 is 4.6 and 9.4 times higher than that of CIS and CeO 2 alone, respectively. The improved photocatalytic performance primarily stems from enhanced charge separation promoted by the S-scheme heterojunction. The charge transfer pathway was confirmed as an S-scheme mechanism through a combination of band structure experiments, density functional theory (DFT) calculations on work function, internal electric field, and charge differential density distribution, alongside electron paramagnetic resonance (EPR) experiments. Multiple perspectives were employed to elucidate the reasons behind facilitating efficient charge separation. This research provides valuable insights for advancing photocatalytic performance.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 22
·13472-13482
·
IF 3.269
Mengqiu Huang,Yiwei Zhang,Yuming Zhou,Chao Zhang,Shuo Zhao,Jiasheng Fang,Yan Gao,Xiaoli Sheng
This work reports a novel type of sandwich-like hollow Au-based nanocatalyst, including a TiO2–ZrO2 shell, a hollow CeO2 core and Au nanoparticles of 2–5 nm. Uniform crystal ceria hollow nanostructures were synthesized using a simple one-step hydrothermal method without a template. Then binary TiO2–ZrO2 coated Au nanocatalysts were prepared via a facile bottom-up synthesis method. The structural features of the catalysts were characterized by several techniques, including SEM, TEM, EDX, FTIR, BET, XRD, UV-vis and XPS analyses. Using the reduction of 4-nitrophenol by NaBH4 as a model reaction, the TiO2–ZrO2/Au/CeO2 microspheres showed a superior catalytic activity and thermal stability compared with a pure TiO2 or ZrO2 layer. In addition, TiO2–ZrO2/Au/CeO2 microspheres calcined at 700 °C presented the highest thermal stability and reactivity. These comparative results were mainly attributed to the synergistic effect among the mixed oxide, hollow CeO2 core and Au NPs and the sandwich-like structure. As a consequence, this unique nanocatalyst will open a promising route for the fabrication of hollow binary-metal-oxide materials for future research and has great potential for other applications.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）