ChemNanoMat
·
2022
·Vol. 8
·期 10
·e202200269
·
IF 3.82
Ziye Guo,Huanhuan Yang,Qingyong Tian,Wenjie Ma,Qun Xu,Buxing Han
Graphical A template- and surfactant-free top-down strategy was developed to transform non-vdW bulk CeO 2 into 2D amorphous CeO 2− x nanosheets with defective structure for the first time by cleaving Ce−O covalent bonds with the assistance of supercritical CO 2 . The unique nanosheets show outstanding UV-vis adsorption and photoluminescence properties due to the disordered atomic structure and increased vacancy defects (F-centers). Two-dimensional (2D) non-van der Waals (non-vdW) amorphous nanomaterials have attracted much attention for optical, catalytic and biomedical applications owing to their rich dangling bonds and unsaturated coordination. CeO 2 , a typical non-vdW material, with amorphous 2D structure and intrinsic optical properties have rarely been prepared via a top-down method due to the lack of anisotropy in its 3D bonding network. Herein, we develop an environmentally-friendly top-down method to achieve ultrathin 2D amorphous CeO 2− x with controllable defects from bulk CeO 2 by utilizing supercritical CO 2 . The unique CeO 2− x nanosheets exhibit outstanding ultraviolet-visible adsorption and photoluminescence (PL) properties due to the disordered atomic structure and increased vacancy defects resulting from the cleavage of Ce−O covalent bonds and amorphization of CeO 2 . In addition, the defect-related emission mechanism of the visible PL for the as-prepared 2D CeO 2− x nanosheets has been proposed.
研究领域:
材料科学
·
光学
·
纳米技术
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产品关联
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 93
·期 12
·2903-2913
·
IF 1.946
Pan Xiong,Siqi Fan,Jinshan Song,Qizhou Dai
In this study, a magnetic nanocatalyst (Fe 3 O 4 @SiO 2 @CeO 2 ) was prepared and applied in the catalytic ozonation of methyldopa (MD). The effects of operational parameters on catalytic ozonation performance were investigated, including ozone dosage, catalyst dosage, initial MD concentration, and pH. The removal of MD was 45.2% in ozonation, whereas the efficiency was achieved to 83.0% with the addition of Fe 3 O 4 @SiO 2 @CeO 2 . The results showed that Fe 3 O 4 @SiO 2 @CeO 2 could significantly improve the catalytic ozonation performance. And the enhanced mechanism study showed that it was attributed to promotion of ozone decomposition to generate hydroxyl radical. The reaction model was explored, and the reaction rates were calculated for the MD degradation in catalytic ozonation. A higher degradation efficiency of MD in catalytic ozonation was attributed to the enhanced surface effect of the catalysts, which was confirmed by using TBA, PO 4 3− , and p -BQ as scavengers of hydroxyl radical, surface reaction, and superoxide radical. The hydroxyl radical and superoxide radical played an important role in the degradation of MD. The mechanism of catalytic ozonation by Fe 3 O 4 @SiO 2 @CeO 2 was discussed via X-ray photoelectron spectroscopy (XPS) spectra and experimental data. Practitioner Points Fe 3 O 4 @SiO 2 @CeO 2 could promote the decomposition of ozone to produce hydroxyl radicals. High degradation efficiency of methyldopa with Fe 3 O 4 @SiO 2 @CeO 2 was achieved. A mechanism of catalytic ozonation with Fe 3 O 4 @SiO 2 @CeO 2 was proposed.
研究领域:
环境科学
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化学工程
·
药学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Haiying Wei,Licheng Li,Tingwei Zhang,Farzad Seidi,Qiang Chen,Huining Xiao
Catalytic oxidation of ethylene associated with the preservation of fruits and vegetables (F&V) at low temperatures remains challenging. To address this issue, CeO2-octahedron-supported Pt catalysts were synthesized and modified by capacitively coupled plasma for efficient catalytic oxidation of C2H4. After the plasma treatment, CeO2 with rich oxygen vacancies was created, which acted as a support to facilitate the regulation of the size and dispersion of Pt nanoparticles. Compared with Pt/pristine CeO2, the Pt/plasma-modified CeO2 catalyst (Pt/CeO2-P) showed significantly higher reactivity. More than 99.9% of ethylene conversion induced by Pt/CeO2-P could be sustained longer than 50 h at 25 °C, and 30 min even at 0 °C. Thus, Pt/CeO2 interface engineering by plasma modification technology is particularly promising for low-temperature catalytic oxidation of ethylene. Moreover, a comprehensive characterization was conducted to elucidate the reaction pathway and oxidation mechanism. From the preservation test using bananas as fruit samples, it was found that Pt/CeO2-P delayed postharvest deterioration and ripening of bananas due to the excellent ethylene scavenging effect created by the catalyst, thus demonstrating the great potential applications in F&V preservation.
研究领域:
催化化学
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食品科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yongjian Wang,Xiaogang Luo
The high electronegativity and solubility of fluoride ions (F - ) in water at low concentrations pose challenges for their treatment and recovery. To effectively adsorb F - , cellulose beads with trapped CeO 2 nanoparticles (CeO 2 @CBs) were fabricated from a NaOH/urea aqueous solution by the optimal extrusion dropping technology. The CeO 2 @CBs exhibited a maximum removal efficiency of 99.15 % for 10.0 mg L −1 F - at 45°C, pH=3.0 and an adsorbent dose of 1.0 g. The CeO 2 @CBs were characterized using SEM-EDS, FT-IR, XRD , and XPS . These findings demonstrate that CeO 2 nanoparticles were uniformly entrapped in cellulose beads and reveal that the removal mechanism involves anionic exchange and electrostatic attractions between protonated hydroxyl on CeO 2 @CBs surface and F - . The results show that the anion competition sequence that affects the F - adsorption efficiency was Cl −
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
Catalysis Science & Technology
·
2021
·Vol. 11
·期 7
·2577-2588
·
IF 6.119
Xian Wu,Weixin Qian,Haitao Zhang,Zhonghao Han,Hewei Zhang,Hongfang Ma,Dianhua Liu,Qiwen Sun,Weiyong Ying
CeO2 nanorods with a mean width of 11.9 nm were synthesized via a facile hydrothermal method. Subsequently, Fe/CeO2 and Fe/CeO2@xMnO2 catalysts were prepared from the CeO2 nanorods and applied in the high-temperature Fischer–Tropsch synthesis of light olefins. Results show that the CeO2 support donates electrons to Fe species, which promotes the dissociation of CO while suppressing the hydrogenation reaction, and then improves the selectivity to light olefins. The synergistic effect between Mn and Ce can improve the oxygen mobility on the catalyst surface and promote the electron-donating ability of Ce, thereby promoting the formation of χ-Fe5C2 and further improving the selectivity to light olefins. However, excess Mn hinders the contact between CeO2 and Fe species and the migration of O atoms, and electron transfer from Ce to Fe can be blocked. Additionally, the reduction of iron oxides was suppressed and subsequently the CO conversion was reduced. The best hydrocarbon distribution for light olefins was 40.4% at a CO conversion of 39.9% over the Fe/CeO2@0.2MnO2 catalyst.
研究领域:
化学工程
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材料科学
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催化反应
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yanhui Dai,Feiran Chen,Le Yue,Teng Li,Zhixiang Jiang,Zefeng Xu,Zhenyu Wang,Baoshan Xing
Many studies demonstrated that CeO2 nanoparticles (NPs) could protect plant from stress and improve plant growth, with a great application potential in agriculture. However, our knowledge of their fate particularly in asexual plants and their effect on the rhizosphere microbiome is limited. In this study, the transport and transformation of CeO2 NPs in an asexual plant—strawberry (Fragaria × ananassa Duch.)—were investigated. The effects of root-exuded/newly formed Ce species on rhizosphere bacterial community were also examined. Strawberries were exposed to CeO2 NPs at 0–2000 mg/L for 45 days via a split-root system in the field. CeO2 NPs were taken up by the exposed mother ramet roots and then translocated to all the mother and daughter ramet tissues. As indicated by the analysis from high-resolution transmission electron microscopy and X-ray absorption near-edge structures, in addition to CeO2 NPs, CePO4, Ce(III) acetate, and Ce(III)-cysteine were found in the roots, and CePO4 was present in the rhizosphere soil. The Ce species in the rhizosphere soil decreased the rhizosphere microbial diversity, but stimulated the relative abundance of specific plant growth promoting rhizobacteria. These results provide new insights for understanding the benefits and sustainable applications of NPs.
研究领域:
农业
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环境科学
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微生物学
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植物科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Lei Chen,Ding Weng,Jiadao Wang,Duan Weng,Li Cao
The CeO 2 -TiO 2 (CeTi) and CeO 2 /WO 3 -TiO 2 (CeWTi) catalysts were prepared by a sol-gel precipitation method and their NH 3 -NO/NO 2 selective catalytic reduction (SCR) performance was studied. N 2 O formation and effect of oxygen concentration on SCR performance over CeWTi catalyst were also investigated while varying the NO 2 /NO x ratio. Results indicate that fast SCR behavior of CeWTi catalyst has the best NH 3 -NO/NO 2 SCR performance due to the catalyst reoxidation rate by NO 2 higher than by O 2 . Compared with CeTi catalyst, CeWTi catalyst exhibits higher de-NO x performance under NH 3 -NO/NO 2 SCR conditions. As the CeTi and CeWTi catalysts exhibit similar redox property, addition of WO 3 provides more acid sites which accelerate the reaction between NH 4 NO 3 and NO to get a superior low-temperature activity. Amount of N 2 O formation shows a peak at 250 °C mainly derived from NH 4 NO 3 decomposition.
研究领域:
催化劑科學
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環境工程
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Jun Tang,Ningyuan Zhu,Yan Zhu,Seyed Morteza Zamir,Yonghong Wu
The responses of periphytic biofilm to CeO 2 nanoparticle (CNP) exposure were explored by investigating community shifts and pollutant removal. Results showed that CNPs entered the sensitive microbial cells in the periphytic biofilm, leading to cytomembrane damage and intracellular reactive oxygen species (ROS) generation. The periphytic biofilm communities were, however, able to adapt to the prolonged exposure and maintain their pollutant removal (i.e., phosphorus, nitrogen and copper, organic matter) performance. Observations under synchrotron radiation scanning transmission X-ray microscopy revealed that fewer CNPs were distributed in algal cells compared to bacterial cells, wherein the transformation between Ce(IV) and Ce(III) occurred. High-throughput sequencing further showed that the proportion of algae, such as Leptolyngbya and Nostoc, significantly increased in the periphytic biofilm exposed to CNPs while the proportion of bacteria, such as Bacilli and Gemmatimonadetes, decreased. This change in community composition might be the primary reason for the sustained pollutant removal performance of the periphytic biofilm.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Pengxian Li,Junfeng Ren,Caixia Li,Jiaxu Li,Kai Zhang,Tingting Wu,Bin Li,Lei Wang
Interface engineering is considered as an effective way to inhibit dendrite growth and side reactions in rechargeable zinc ion batteries (ZIBs). Herein, to explore the best treatment routes on how to construct multi-functional protective layers with MOF-based nanomaterials, defect-rich CeO 2 polycrystals are designed with Ce-MOF-808 precursor as ion-selective smart artificial SEI for ZIBs. Interestingly, crystal defects which can provide active sites for Zn 2+ transfer, are introduced to MOF-CeO 2 via pyrolysis. Furthermore, the negative Zeta potential gives high selectivity to cations and shielding effect to anions, inhibiting the side reactions. Besides, MOF-CeO 2 can promote the desolvation process of Zn[(H 2 O) 6 ] 2+ and balance Zn-ion flux by pores. Impressively, synergistic effects on dendrite inhibition by chemical stability, crystal defects, surface charge properties, and hierarchically porous structure are investigated comprehensively. Therefore, MOF-CeO 2 @Zn anode exhibited ultra-stable plating/stripping behavior (more than 3200 h) and high Coulomb efficiency (99.5 % at 2 mA cm −2 ). This multi-functional protective layer also significantly improves the overall performance of Zn||MnVO full battery, with high-capacity retention at 5 A/g after 10,000 cycles.
研究领域:
材料科学
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电化学
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纳米技术
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-11
·
IF 5.3
Cheng Yan,Wang Yunzhi,Zhang Pengcheng,Hu Xing,Hou Xiaolin,Zhang Bing
Enzyme-mimicking nanomaterials have gained significant attention for use in colorimetric immunoassays. However, further enhancing their mimetic enzyme activity remains crucial for improving assay sensitivity. In this study, CeO 2 /g-C 3 N 4 nanozymes were synthesized with enhanced catalytic activity when exposed to visible light. The irradiation facilitates electron transfer within the CeO 2 /g-C 3 N 4 nanomaterials, leading to the generation of reactive oxygen species (ROS). These ROS then promote the oxidation of 3,3',5,5'-tetramethylbenzidine (TMB), causing a distinct color change. Based on this, a novel colorimetric immunoassay platform was developed, using the CeO 2 /g-C 3 N 4 nanomaterials as labels. Under visible light, the color development signal was significant amplified, resulting in improved sensitivity. This approach showed a linear response for the detection of carcinoembryonic antigen (CEA) in the range 0.5–30 ng/mL, with a limit of detection (LOD) of 0.13 ng/mL. The assay also demonstrated high specificity and excellent reproducibility. Consequently, this method offers a promising strategy for early cancer diagnosis and holds considerable potential for wider clinical applications. Graphical
研究领域:
肿瘤学
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免疫学
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纳米医学
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分子诊断
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转化医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Hao Wu,Qian Sun,Jingyi Chen,Guan-Yu Wang,Dan Wang,Xiao-Fei Zeng,Jie-Xin Wang
Degradation of glyphosate has attracted much attention all over the world, since glyphosate has been demonstrated to affect the human health through the accumulation in food chain. Herein, we use citric acid as capping agent to synthesize highly-stable aqueous dispersions of monodispersed CeO 2 nanoparticles (NPs) with ultrasmall controllable size of 2.1–4.8 nm, high surface areas and rich oxygen defects, which were firstly used as photocatalyst for efficient degradation of glyphosate. The obtained CeO 2 NPs display a significantly size-dependent catalytic activity and a good stability performance. Ultrasmall 2.1 nm CeO 2 NPs have 6 times (UV) and 20 times (visible light) degradation rates of 4.8 nm counterpart, which can rapidly remove glyphosate from water at pH = 4 in 5 min (UV) and 20 min (visible light). And the related degradation kinetics data at pH = 4 are well related to the pseudo-first-order kinetic model. In this highly-efficient photocatalytic degradation process, the grafted citric acid can initiate the electron transfer to accelerate the regeneration of Ce 3+ sites as electron donors and enhance photocatalytic performance via ligand-to-metal charge transfer. This work provides a new method to prepare high-performance CeO 2 photo-nanocatalysts for the removal of glyphosate and emphasizes the important role of modifier, oxygen defects and particle size in seeking efficient photocatalytic materials.
研究领域:
环境科学
·
纳米技术
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催化
·
水处理
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 3
·2445
·
IF 5.6
Nan Wang,Xiaofan Zhai,Fang Guan,Ruiyong Zhang,Baorong Hou,Jizhou Duan
Exploring new and high efficiency mimic enzymes is a vital and novel strategy for antibacterial application. Haloperoxidase-like enzymes have attracted wide attention thanks to their amazing catalytic property for hypohalous acid generation from hydrogen peroxide and halides. However, few materials have displayed halogenating catalytic performance until now. Herein, we synthesized N-doped C/CeO2(N-C/CeO2) composite materials by a combination of the liquid and solid-state method. N-C/CeO2can possess haloperoxidase-like catalytic activity by catalyzing the bromination of organic signaling compounds (phenol red) with H2O2at a wide range of temperatures (20 °C to 55 °C), with a solution color changing from yellow to blue. Meanwhile, it exhibits high catalytic stability/recyclability in the catalytic reaction. The synthesized N-C/CeO2composite can effectively catalyze the oxidation of Br−with H2O2to produce HBrO without the presence of phenol red. The produced HBrO can resist typical marine bacteria likePseudomonas aeruginosa. This study provides an efficient biomimetic haloperoxidase and a novel sustainable method for antibacterial application.Keywords:N-C/CeO2composite;catalytic materials;biomimetic catalyst;haloperoxidase-like enzyme;antibacterial
研究领域:
生物化学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）