RSC Advances
·
2019
·Vol. 9
·期 39
·22366-22375
·
IF 3.049
Yaohui Xu,Ruixing Li,Yang Zhou
An eco-friendly route was developed for the synthesis of mesoporous CeO2 powders without any additional template. The original cerium precursors were separated from Ce3+ aqueous solution by (NH4)2CO3 or Na2CO3 via a chemical precipitation method, then H2O2 was introduced to induce the phase transformation from original cerium precursors to CeO2 precursors with initial porous structures, finally the crystallinities of CeO2 precursors were improved by a hydrothermal treatment, meanwhile the mesoporous structures of final CeO2 powders were formed. The BET surface areas of mesoporous CeO2 powders synthesized using (NH4)2CO3 and Na2CO3 as precipitants were 106.1 and 76.9 m2 g−1, respectively. Moreover, a mesoporous CeO2 sample with BET surface area of 100.0 m2 g−1 was also synthesized using commercial Ce2(CO3)3·xH2O as an existing cerium precursor under the same conditions as control, which could shorten experimental processes and reduce costs. The oxidation-induced phase transformation from original cerium precursors to CeO2 precursors with initial porous structures was the precondition for further forming of mesoporous structures of final CeO2 powders during the hydrothermal process. These mesoporous CeO2 powders showed the rapid and effective adsorption for acid orange 7 dye from simulated wastewater without pH pre-adjustment at room temperature. Furthermore, the adsorption capacities of these mesoporous CeO2 powders for removal of acid orange 7 dye were determined according to the Langmuir linear fits.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Small Methods
·
2021
·Vol. 5
·期 7
·2100423
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IF 14.188
Mingzhe Shao,Dapeng Liu,Baolin Yan,Xilan Feng,Xiaojuan Zhang,Yu Zhang
Inorganic nanomaterials have attracted much attention as enzyme mimics because of simple and stable spatial conformation of those artificially synthesized nanocatalysts. Cu 2 O, as an important kind of narrow band gap semiconductor, is identified as effective as visible-light-driven photocatalysts, which can catalyze decomposition of H 2 O 2 into reactive oxygen species. Moreover, after forming Cu x O/CeO 2 hybrids, the strongly coupled interface between the two components will further improve their catalytic performance. In this paper, the authors try to construct FTO/TiO 2 /Cu x O/CeO 2 (1 < x < 2) nanohybrids with such a kind of active interface via a layer-by-layer electrodeposition strategy by aid of the following surface etching process. It is found that FTO/TiO 2 /Cu x O/CeO 2 exhibits good peroxidase mimic activity in the dark but much better performance under visible light irradiation (λ ≥ 420 nm) during catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine substrates in the presence of H 2 O 2 . Detailed characterizations disclose that the construction of TiO 2 /Cu 2 O pn-heterojunctions do effectively accelerate separation of photogenerated carriers, and the formation of a highly active Cu x O/CeO 2 interface is synergistically favorable for selectively generating singlet oxygen to boost the catalytic performance of FTO/TiO 2 /Cu x O/CeO 2 .
研究领域:
材料科学
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催化化学
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纳米技术
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2022
·
IF 5.477
Yanan Wei,Chunxiang Li,Chentao Zhu,Yunlei Zhang,Zhi Zhu,Yao Chen,Xin Li,Yongsheng Yan
Background The conversion of 5-Hydroxymethylfurfural into high value-added 2,5-furandicarboxylic acid is of great significance for industrial production and people's life. Rationally regulation of oxygen vacancy and reactant adsorption are keys to developing an efficient metal oxide catalyst for aerobic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxylic acid. Method In this research, nitrogen-doped porous carbon-supported Bi-doped CeO 2 (x%Bi-CeO 2 /N-PC T ) catalysts were successfully prepared by co-calcination method. Significant findings Oxygen vacancy concentration of CeO 2 can be effectively enlarged by Bi-doping, which was strongly related to the catalytic performance. In-situ FTIR and adsorption experiment results showed that the introduction of N-PC T can enhance the HMF adsorption performance of catalyst. Density functional theory calculation and XPS results proved that the HMF adsorption performance depend on content of graphitic N in N-PC T , thus effecting the catalytic performance of HMF oxidation. Synergistic effect of oxygen vacancy and HMF adsorption ability can enhance the catalytic performance, the FDCA yield of 10%Bi-CeO 2 /N-PC 800 was about 70 times higher than that of pure CeO 2 . 10%Bi-CeO 2 /N-PC 800 as support for Au nanoparticles demonstrated an excellent yield of FDCA (92.8%). This study provides a novel idea for design of CeO 2 -based catalyst for oxidation of HMF to high value-added downstream chemicals.
研究领域:
催化化学
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材料科学
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能源化工
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Xueding Jiang,Shufeng Lai,Weicheng Xu,Jianzhang Fang,Xin Chen,Jingzi Beiyuan,Xiwu Zhou,Kaichun Lin,Junxing Liu,Gongcou Guan
In this work, a novel visible-light-driven ternary BiOI/g-C 3 N 4 /CeO 2 photocatalyst was successfully synthesized by calcination and hydrothermal treatment . The obtained ternary BiOI/g-C 3 N 4 /CeO 2 had high photocatalytic performance for the degradation of tetracycline (TC) under visible-light irradiation. The samples were characterized by X-ray diffraction (XRD), UV–Vis diffuse reflectance (DRS) spectroscopy, and Fourier transform infrared spectroscopy (FT-IR), etc. The results indicated that 3 wt% BiOI/g-C 3 N 4 /CeO 2 catalyst possessed the best photocatalytic activity (91.6%) among all the as-prepared samples. The enhanced photocatalytic activity could be attributed to a double charge transfer process between g-C 3 N 4 and other catalysts in the ternary heterojunction , so that the separation of photogenerated electron–hole pairs was more effective. The as-prepared ternary sample also exhibited high stability after six cycles of the photodegradation reaction. Additionally, the active species (h + ) were considered as the main reactive species during the degradation of TC. Based on the research results, a possible photocatalytic reaction mechanism for the BiOI/g-C 3 N 4 /CeO 2 sample was proposed and discussed in detail.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 25
·19601-19612
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IF 3.84
Tigang Duan,Ye Chen,Qing Wen,Ying Duan
Sb-doped SnO2 electrode was fabricated by the one-step pulse electro-codeposition method, and was modified through either cerium dioxide nanoparticle (nano-CeO2) or cerium ion doping. The results showed that the effects of nano-CeO2 doping and cerium ion doping are quite different. Nano-CeO2 doping shrinks the unit cell volume, improves the degree of crystallinity and refines crystalline grains, while cerium ion doping expands the volume and deteriorates the crystallinity. Nano-CeO2 doping mitigates the surface antimony enrichment and promotes the complete oxidation of antimony so that the majority of antimony oxidation states exist as the Sb5+ state, but cerium ion doping aggravates the enrichment and increases the Sb3+ content. Electrochemical phenol degradation showed that the Ti/Sb–SnO2–CeO2 electrode has a higher degradation efficiency and its kinetic rate constant is 1.46 times as much as that of Ti/Ce–Sb–SnO2. Besides, due to the compact active layer of Ti/Sb–SnO2–CeO2 protecting the titanium substrate from passivation, the accelerated service lifetime of Ti/Sb–SnO2–CeO2 is prolonged, which is 1.28 times as long as that of Ti/Ce–Sb–SnO2.
研究领域:
电化学
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材料科学
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环境工程
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2021
·Vol. 35
·期 8
·e6269
·
IF 4.105
Xiaoying Wang,Biao Li,Jingjing Fan,Shanshan Tian,Xiangyang Wei
Polymer functionalized nanoparticles (NPs) have a great attention in biomedical applications owing to their unique properties like regenerative antioxidant, anti-inflammatory, auto-catalytic properties, and biocompatibility. In this current work, we demonstrated a facile synthesis of Se-CeO 2 via chemical method followed by precipitation method. The prepared Se NPs were characterized by ultraviolet–visible (UV-vis) spectroscopy, and the size and morphology of the NPs were analysed using transmission electron microscopy (TEM). Meanwhile, Se-CeO 2 NPs loaded on polylactic-co-glycolic acid (PLGA) nanocarrier were characterised by Fourier transform infrared (FT-IR), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), TEM, and energy dispersive X-ray analysis (EDAX) mapping techniques. The morphological and spectroscopic investigations of prepared nanomaterials have exhibited favourable morphological structure and chemical interactions with respective polymeric molecules, which established that nanovesicle suitability for the SCI functional recovery. We first investigated Se nanoformulated CeO 2 material for the potential healing of in vitro spinal cord study. Our results demonstrated that preparation of NPs loaded PLGA nanocarrier has provide effective spinal cord regeneration and imply that it was explored that promising nanocarrier in the SCI treatment. Se-NPs encapsulated CeO 2 nanostructures administrations for SCI therapies have greatly suppressed oxidative stress and induced anti-inflammatory action, which leads to prospective therapeutic benefits of spinal cord regeneration. These investigative results demonstrate that Se-CeO 2 NPs with PLGA carrier could have great attention for effecient functional recovery treatment and care for spinal cord injury.
研究领域:
生物医学工程
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纳米医学
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再生医学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
·
IF 2.714
Muxi Luo,Xuejiao Qi,Tongxuan Ren,Yuxiong Huang,Arturo A. Keller,Hongtao Wang,Boran Wu,Huapeng Jin,Fengting Li
CeO 2 and TiO 2 engineered nanoparticles (ENPs) are being increasingly used in many applications. Due to their properties, heteroaggregation between these two types of ENPs is very likely, which can determine their fate and transport. However, the heteroaggregation behavior of CeO 2 and TiO 2 ENPs is still not clear, partly due to the lack of appropriate tools. In this study, we investigated the application of Turbiscan Stability Index (TSI) for the measurements of CeO 2 /TiO 2 ENP heteroaggregation. TSI was found to be effective to investigate the heteroaggregation and stability of the CeO 2 -TiO 2 ENPs system. Increasing CeO 2 /TiO 2 ENPs ratio reduces the TSI values, indicating higher stability. Fluorescence excitation-emission matrix (EEM) spectra were used to study the interface interaction between humic acid (HA) and CeO 2 /TiO 2 ENPs. The TSI value of ENPs were rising with the increasing of CeO 2 /TiO 2 ENPs ratios in the H River or Q Reservoir water. In addition, their variation trends were similar to those in well-controlled synthetic water. Proposed interaction mechanisms include surface charge attraction and competitive adsorption.
研究领域:
环境科学
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纳米技术
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Mingyuan Chi,Jichun Liu,Lianxin Li,Yuewen Zhang,Meng Xie
Alzheimer’s disease (AD) has a complex etiology and diverse pathological processes. The therapeutic effect of single-target drugs is limited, so simultaneous intervention of multiple targets is gradually becoming a new research trend. Critical stages in AD progression involve amyloid-β (Aβ) self-aggregation, metal-ion-triggered fibril formation, and elevated reactive oxygen species (ROS). Herein, red blood cell membranes (RBC) are used as templates for the in situ growth of cerium oxide (CeO2) nanocrystals. Then, carbon quantum dots (CQDs) are encapsulated to form nanocomposites (CQD-Ce-RBC). This strategy is combined with photothermal therapy (PTT) for AD therapy. The application of RBC enhances the materials’ biocompatibility and improves immune evasion. RBC-grown CeO2, the first application in the field of AD, demonstrates outstanding antioxidant properties. CQD acts as a chelating agent for copper ions, which prevents the aggregation of Aβ. In addition, the thermal effect induced by near-infrared laser-induced CQD can break down Aβ fibers and improve the permeability of the blood–brain barrier. In vivo experiments on APP/PS1 mice demonstrate that CQD-Ce-RBC combined with PTT effectively clears cerebral amyloid deposits and significantly enhances learning and cognitive abilities, thereby retarding disease progression. This innovative multipathway approach under light-induced conditions holds promise for AD treatment.
研究领域:
神经科学
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材料科学
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生物医学工程
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治疗学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jian Ju,Li Lei,Gaoyang Zhao,Minghu Shen
In this paper, trilayer thin films of Bi 2 Sr 2 CaCu 2 O 8+δ /CeO 2 /Bi 2 Sr 2 CaCu 2 O 8+δ (Bi-2212/CeO 2 /Bi-2212) were fabricated using a dip-coating method, with the heat treatment temperature decreased layer by layer. The growth characteristics and superconducting properties of these trilayer thin films were investigated. Results indicate that the c -axis epitaxial growth characteristics of the bottom Bi-2212 film are maintained. Epitaxial growth relationship at the Bi-2212/CeO 2 /Bi-2212 interfaces were further confirmed by STEM imaging. The critical transition temperatures ( T c ) of the top and bottom Bi-2212 films is 72 K and 74 K, respectively. Critical current ( I c ) values decrease with increasing CeO 2 film thickness. At a CeO 2 film thickness of 116 nm, the resistivity between the two Bi-2212 films is 8.6 × 10 11 Ω·cm. This high resistivity demonstrates that a thicker intermediate CeO 2 layer can function effectively as an insulator for superconducting magnetic flux converter applications.
研究领域:
材料科学
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凝聚态物理
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纳米技术
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薄膜技术
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超导电性
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
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2024
·
IF 6.1
Haiyang Zheng,Na Yin,Kehong Lv,Rui Niu,Shijie Zhou,Yinghui Wang,Hongjie Zhang
Sonodynamic therapy (SDT) has been recognized as a promising treatment for cancer due to its advantages of superior specificity, non-invasiveness, and deep tissue penetration. However, the antitumor effect of SDT remains restricted by the limited generation of reactive oxygen species (ROS) due to the lack of highly efficient sonosensitizers. In this work, we developed the novel sonosensitizer Pt/CeO2−xSx by constructing oxygen defects through S doping and Pt loading in situ. Large amounts of oxygen defects have been obtained by S doping, endowing Pt/CeO2−xSx with the ability to suppress electron–hole recombination, further promoting ROS production. Moreover, the introduction of Pt nanoparticles can not only produce oxygen in situ for relieving hypoxia but also form a Schottky heterojunction with CeO2−xSx for further inhibiting electron–hole recombination. In addition, Pt/CeO2−xSx could effectively deplete overexpressed glutathione (GSH) via redox reactions, amplifying oxidative stress in the tumor microenvironment (TME). Combined with the excellent POD-mimetic activity, Pt/CeO2−xSx can achieve highly efficient synergistic therapy of SDT and chemodynamic therapy (CDT). All these findings demonstrated that Pt/CeO2−xSx has great potential for cancer therapy, and this work provides a promising direction for designing and constructing efficient sonosensitizers.
研究领域:
癌症治疗
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材料科学
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纳米技术
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生物医学工程
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·3161-3180
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IF 3.3
Liu Wenyi,Sun Dedong,Ma Hongchao,Ma Chun,Zhang Xinxin,Hao Jun
In the present work, a novel CeO 2 /ZIF-9 composites were prepared, characterized and used as a multiphase catalyst to activate peroxymonosulfate (PMS) to degrade methylene blue (MB). The effects of Ce/Co molar ratio, catalyst dose, PMS concentration, initial solution pH and reaction temperature were explored. The results showed that 20 mg/L MB was almost absolutely degraded, and the removal rate of COD reached 77.8% by 150 mg/L PMS activated with 50 mg/L 0.50-CeO 2 /ZIF-9 within 30 min at room temperature (20 °C) and initial pH 6.4. The active species such as SO 4 •− , 1 O 2 and • OH performed important roles in the catalytic process, as evidenced by quenching experiment and electron paramagnetic resonance (EPR) analysis. The synergistic catalytic mechanism of 0.50-CeO 2 /ZIF-9 in the heterogeneous activation of PMS was proposed, which mainly involves the enhanced redox cycle of Co 3+ /Co 2+ by Ce 3+ donated electrons. Recycling experiments suggested that the removal efficiency of MB can still reach 92.9% after four catalytic cycles, indicating good reusability of 0.50-CeO 2 /ZIF-9 catalyst. Therefore, because of its easy preparation, superior catalytic performance and reusability, the 0.50-CeO 2 /ZIF-9 composite catalyst has promising applications in water treatment.
研究领域:
环境科学
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催化
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水处理
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2016
·
IF 3.698
Guoqiang Gan,Juan Liu,Zhixi Zhu,Ziran Yang,Conglu Zhang,Xiaohong Hou
In this work, magnetic nanoparticles (MNPs) Fe 3 O 4 /CeO 2 were firstly synthesized using three different preparation methods, including coprecipitation, impregnation oxidation-precipitation and impregnation reduction-precipitation, respectively. The catalytic activities of Fe 3 O 4 /CeO 2 MNPs, prepared by above three methods, were compared systematically in terms of the degradation of orange G (OG). The impregnation oxidation-precipitation process was economical and maneuverable due to the usage of air, no need of nitrogen protection and higher utilization efficiency of iron. Response surface methodology based on central composite design were used to investigate the individual and interactive effects of three process parameters on the OG degradation, i.e. the initial pH of the solution, the dosage of H 2 O 2 and the initial concentration of OG. Under the optimal conditions of pH 2.5, H 2 O 2 30 mM, OG 50 mg L −1 , catalyst 2.0 g L −1 and 35 °C, the degradation percentage of OG was 98.2% within 120 min, which agreed well with the modeling prediction (R 2 = 0.9984, and Adj-R 2 = 0.9969). And the degradation reaction well followed the first-order kinetic with R 2 = 0.9969. The Fe 3 O 4 /CeO 2 -OX MNPs showed high catalytic activity, stability and reusability in the degradation of OG.
研究领域:
环境科学
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材料科学
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化学工程
✓ 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）