COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
·
IF 3.131
Gang Yu,Kuo Han,Jing Wang,Xiao Cheng,Hongmei Ma,Hongya Wu,Zhigang Yang,Guanglei Zhang
In the present work, the activated carbon fibers (ACFs) with homogenous and crystalline CeO 2 -ZrO 2 coatings were obtained using a facile water steam treatment process at a low temperature (300 °C) for efficient removal of Pb(II) from aqueous solutions. The morphology, surface chemical states, and adsorption performance were studied extensively. Results demonstrated that the steam-treated CeO 2 -ZrO 2 /ACFs possessed superior high surface areas (783.23 m 2 g −1 ) and pore volumes (0.41 cm 3 g −1 ). Moreover, numerous C-O-M bonds formed in the interface between CeO 2 -ZrO 2 coatings and ACFs, which can endow the adsorbent desired mechanical property and service durability as well as many surface hydroxyl groups were found and adsorption capacity (61.54 mg g −1 at pH 6.5 ± 0.3 and 25 °C). It was suggested that the steam-treated CeO 2 -ZrO 2 /ACFs could be considered as a promising adsorbent towards wastewater treatment .
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2020
·
IF 3.573
Wei Fang,Jinghuan Chen,Xiangyuan Zhou,Jianjun Chen,Zhiping Ye,Junhua Li
In this work, a core–shell structured CeO2@Co3O4 catalyst was successfully prepared by using a zeolitic imidazolate framework-based material as a sacrificial template. The structure, morphology, and physicochemical characteristics of these materials were investigated by X-ray diffraction, N2 sorption, Fourier transform infrared spectroscopy, Raman spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, temperature-programmed desorption, and temperature-programmed reduction studies. Compared with pure Co3O4 and CeO2, the CeO2@Co3O4 sample displayed superior catalytic performance (T90 = 225 °C) toward toluene oxidation. Results demonstrated that the CeO2@Co3O4 sample exhibited a core–shell structure, with hierarchically wrinkled surfaces. This unique structure, especially the interface between the core and the shell, endowed the CeO2@Co3O4 catalyst with better activity. In addition, there was a synergistic effect between cerium and cobalt oxides in the core–shell bimetallic sample, which was responsible for the improved performance of the material. Moreover, surface-active oxygen species involved and played a significant role in toluene oxidation.
研究领域:
催化材料
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环境科学
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材料化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Xiaowang Lu,Xiazhang Li,Feng Chen,Zhigang Chen,Junchao Qian,Qinfang Zhang
The novel nitrogen doped two-dimensional CeO 2 –TiO 2 nanosheets with a thickness of less than 5 nm were synthesized by a facile impregnation method using Chinese rose petals as biological templates. The detailed characterization by field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) exhibited that the CeO 2 –TiO 2 composites exactly duplicated the microstructure of Chinese rose petal and the self-owned nitrogen was successfully doped into the CeO 2 –TiO 2 composites, which could enhance the visible light absorption efficiency. UV–Vis diffuse reflection spectroscopy (DRS), photocurrent measurement (PM), electrochemical impedance spectroscopy(EIS) and photoluminescence spectroscopy (PL) were used to analyze the electrons and holes separation efficiency, which revealed that CeO 2 and TiO 2 formed well-defined hetero junctions promoting the effective separation of photogenerated electrons and holes. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of dibenzothiophene (DBT) in model oil. The amount of hydrogenperoxide (H 2 O 2 ) and photocatalysts , the molar ratios of Ce and Ti in CeO 2 –TiO 2 composites as photocatalytic reaction conditions were investigated. Results showed that the removal rate of DBT could reach 93.7% under visible light irritation for 3 h, when the molar ratio of Ce/Ti was 1/1, the mass ratio of photocatalyst/DBT was 1/2 and the molar ratio of H 2 O 2 /DBT was 2/1. The trapping experiments confirmed that the photoinduced active species (•OH radical) was responsible for the degradation of DBT. Further studies demonstrated that DBT was converted to the corresponding sulfone, which could be extracted by the polar solvent. Moreover, a plausible mechanism for the photocatalytic oxidative desulfurization of this nanocomposite was proposed.
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 ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Zhao Li,Zhi Liu,Yang Li,Qiu Wang
In this article, a simple yet effective in situ hydrothermal method has been developed to synthesize a series of CeO 2 and reduced graphene oxide (RGO) stepwise-doped CoAl-LDH (CACR) composites with CoAl-LDH/CeO 2 (CAC) as the intermediate. The smart design well integrates the photo-electrochemical merits of CoAl-LDHs and CeO 2 with conductive RGO to form an optimized formula with high light-harvesting ability, efficient charge separation, and rapid electron transfer . Owing to these features, the sample of CAC-5-R-10 containing 5 wt% CeO 2 and 10 wt% RGO, is found to be the most efficient one as the catalyst for CO 2 photoreduction with a high average CO evolution rate of 5.5 μmol·g −1 ·h −1 at 25 °C without sacrifice reagent or extra photosensitizer under ultraviolet light, which surpasses those of the single CeO 2 , CoAl-LDHs, the intermediate of CAC, and many reported LDH-based counterparts. With the assistance of Mott–Schottky curves, the Z-scheme mechanism is proposed for the significantly enhanced photo-activity of the CAC-5-R-10. The present work provides a good sample for integrating LDHs with a second semiconductor and conductive RGO for collaborative optimization of photoelectric characteristics towards enhanced CO 2 photoreduction.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2013
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IF 3.535
Jing Dong,Xindong Wang,Fengmin Qiao,Pei Liu,Shiyun Ai
A novel multi-walled carbon nanotubes–CeO 2 –Au nanocomposite (MWCNTs–CeO 2 –Au) was synthesized by a facile two-step precipitation method and used for solid-phase extraction of methyl parathion (MP). The MWCNTs–CeO 2 –Au nanocomposite combined the individual properties of MWCNTs (high conductivity and exceptional adsorption affinity) and nanoparticles (high surface area and special catalytic activity), and realized the efficient enrichment and electrochemical stripping voltammetric detection of MP. An ultra-low detection limit of 3.02 × 10 −11 M for MP was obtained at MWCNTs–CeO 2 –Au nanocomposite modified electrode , suggesting the high sensitivity of the nanocomposite based electrochemical sensor . Moreover, the proposed electrochemical sensor was successfully employed for the determination of MP in water and soil samples.
研究领域:
分析化学
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环境科学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 4
·668
·
IF 5.719
Qingyun Li,Lingyu Liu,Zihua Wang,Xuezhong Wang
A confined jet mixing reactor operated in continuous hydrothermal flow synthesis was investigated for the synthesis of CeO2-ZrO2(CZ) nanoparticles. The obtained ultrafine powders were characterized using scanning electron microscopy–energy dispersive spectrometry (SEM-EDS), inductively coupled plasma–atomic emission spectroscopy (ICP-AES), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, X-ray diffraction analysis (XRD), transmission electron microscopy (TEM) coupled with selected area electron diffraction (SAED), a BET (Brunauer-Emmett-Teller)-specific surface area test and pore analysis, oxygen storage capacity (OSC) test, and a H2temperature programmed reduction (H2-TPR) test. The XRD results show that all samples were composed of high-purity cubic CZ nanoparticles. High resolution transmission electron microscope (HR-TEM) analysis showed that CZ nanoparticles with uniform size and shape distributions were obtained in this investigation. The d-spacing values, determined based on the TEM-selected area electron diffraction (SAED) patterns, were in good agreements with the reference data. BET results showed that the prepared CZ samples had large specific surface areas. Pore volume and size distribution were obtained by pore analysis. Oxygen pulse adsorption technology was used to test the oxygen storage capacity of the sample. The redox capacity of the CZ material was determined by a H2temperature-programmed reduction test.Keywords:continuous hydrothermal flow synthesis;confined jet mixing reactor;CeO2-ZrO2nanoparticles;XRD;BET
研究领域:
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
ACS Applied Nano Materials
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2022
·
IF 6.14
Jiahui Gu,Hong Liu,Tingyu Peng,Shun Li,Li Xu,Jianming Zhang,Long Zhang
Plasmonic nanohybrids composed of semiconductors and plasmonic metal nanoparticles (NPs) have been intensively investigated in heterogeneous photocatalysis. The surface plasmonic resonance (SPR) effect of metal NPs plays a critical role in increasing light absorption and excitation of energetic carriers for photocatalysis. Most efforts are devoted to increasing the intrinsic absorptivity of the photocatalyst; however, the possible SPR scattering contribution of the metal NPs to photocatalysis has been long overlooked. In this work, we demonstrate a proof of concept of plasmonic scattering-enhanced absorption for efficient photocatalytic organic conversion in the visible to near-infrared wavelength region. With a multistep wet-chemical deposition approach, Ag NPs are encapsulated into the CeO2–Au system as the scattering core to form a Ag@CeO2–Au core@shell-satellite structure with a metal content of ∼30.6%. By varying the size (30–100 nm in diameter) and aggregation status (single NP or coupled NPs) of the Ag NP core, its scattering effect can be adjusted over a wide spectral range. This smart design results in scattered photon energy by the core composed of coupled 100 nm Ag NPs to greatly resonate with the SPR excitation of Au nanorods on the CeO2 surface over a wide spectral range from 400 to 900 nm, resulting in the confinement of the incident light in the optical path. The SPR scattering effect-induced light harvest and the near-field enhancement at the Au–CeO2 interface greatly boost the generation and separation of hot charge carriers for surface reaction, leading to a superior conversion efficiency of >90% in 3 h with a high selectively of ∼100% for oxidizing aminobenzyl alcohol to aminobenzaldehyde. This work reveals the immediate role of plasmonic scattering for light harvesting in photocatalysts.
研究领域:
化学
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材料科学
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光催化技术
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 3
·256
·
IF 3.444
Feng Zhao,Shuangde Li,Xiaofeng Wu,Renliang Yue,Weiman Li,Xicuo Zha,Yuzhou Deng,Yunfa Chen
CuO-CeO2nanocatalysts with varying CuO contents (1, 5, 9, 14 and 17 wt %) were prepared by one-step flame spray pyrolysis (FSP) and applied to CO oxidation. The influences of CuO content on the as-prepared catalysts were systematically characterized by X-ray diffraction (XRD), N2adsorption-desorption at −196 °C, field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and hydrogen-temperature programmed reduction (H2-TPR). A superior CO oxidation activity was observed for the 14 wt % CuO-CeO2catalyst, with 90% CO conversion at 98 °C at space velocity (60,000 mL × g−1× h−1), which was attributed to abundant surface defects (lattice distortion, Ce3+, and oxygen vacancies) and high reducibility supported by strong synergistic interaction. In addition, the catalyst also displayed excellent stability and resistance to water vapor. Significantly, in situ diffuse reflectance infrared Fourier transform spectroscopy (in situ DRIFTS) showed that in the CO catalytic oxidation process, the strong synergistic interaction led readily to dehydroxylation and CO adsorption on Cu+at low temperature. Furthermore, in the feed of water vapor, although there was an adverse effect on the access of CO adsorption, there was also a positive effect on the formation of fewer carbon intermediates. All these results showed the potential of highly active and water vapor-resistive CuO-CeO2catalysts prepared by FSP.Keywords:flame spray pyrolysis;synergistic interaction;CO oxidation;CuO-CeO2nanocatalyst;water resistance;carbon intermediate
研究领域:
催化化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2024
·Vol. 22
·期 1
·1-15
·
IF 10.6
Sun Yuxiang,Xu Tianze,Qian Yike,Chen Qiaoyun,Xiong Fei,Du Wenxian,Xu Li
Ceria nanoparticles (CeO 2 NPs) exhibit great potential in cardiovascular disease and nonalcoholic fatty liver disease due to its excellent antioxidant capacity. However, the profitable effect of CeO 2 NPs on many diseases is almost all attributed to the regulation of ROS. Apart from the general antioxidant function, there seems to be no more distinct mechanism to reflect its unique multi-disease improvement effect. Here, we for the first time reveal a new discovery of CeO 2 NPs in mimicking nitric oxide synthase (NOS) by catalyzing L-arginine (L-Arg) to produce nitric oxide (NO) or the derivatives. NOS-like activity of CeO 2 NPs is original and associated with multiple factors like substrate concentration, pH, temperature and time, etc. where oxygen vacancy ratio plays a more critical role. Meanwhile, NOS-like activity of CeO 2 NPs successfully elevates NO secretion in endothelial cells and macrophages without expanding eNOS/iNOS expression. Importantly, NOS-like activity of CeO 2 NPs and the responsive endogenous NO promote the re-distribution of blood lipids and stabilize eNOS expression but suppress iNOS, thus collectively alleviate the accumulation of vascular plaque. Altogether, we provide a new angle of view to survey the outstanding potential of CeO 2 NPs, apart from the inevitable antioxidant capacity, the covert but possible and more critical NOS-like enzymatic activity is more noteworthy.
研究领域:
生物医学工程
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心血管疾病研究
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Optical Materials Express
·
2025
·Vol. 15
·期 8
·1891-1901
·
IF 3.1
Yunwei Wei,Shuqiang Lyu,Jianlei Yang,Bingwen Li,Shizhong Yue,Zecheng Zhao,Shujuan Lyu,Xinpei Li,Xinxin Li,Zhuqing Wang
All-inorganic perovskite materials have emerged as highly promising candidates for optoelectronic applications due to their outstanding optoelectronic properties. In this work, we developed an in situ synthetic strategy to fabricate CeO2/Cs4PbBr6 nanocomposites with reversible photoluminescence characteristics. Structural and optical characterization techniques, including powder X-ray diffraction, PL spectroscopy, and elemental mapping analysis, confirmed the successful formation of the nanocomposites, which exhibited photoluminescence and reversible fluorescent response specialties. Notably, systematic investigations revealed that the reaction time and CsBr/PbBr2 molar ratio are critical parameters for optimizing the performance of nanocomposites. Moreover, the practical applicability of the synthesized nanocomposites was demonstrated through the successful fabrication of a white light-emitting diode device, demonstrating their potential for application in optoelectronic devices.
研究领域:
纳米材料
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光电子学
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材料科学
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无机化学
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固体物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yao Gong,Wenxin Qi,Wenyi Lu,Qing Chang,Yijun Xie,Jiao Wang,Xiaoyong Deng
Diabetic wounds are highly prone to persistent pathogenic infections due to the complex nature of their microenvironment, which significantly hinders the healing process under hyperglycemic conditions. In this study, we developed a bio-heterojunction enzyme system consisting of hollow CeO 2 /Ti 3 C 2 T x MXene quantum dots (CeO 2 @MQD) integrated with glucose oxidase (GOx-CeO 2 @MQD). The GOx-CeO 2 @MQD system exhibits multifunctional enzymatic activities, including peroxidase (POD) and catalase (CAT)-like activity, resulting in the production of •OH and O 2 , alongside the consumption of glucose and glutathione (GSH). The incorporation of GOx effectively mitigates the hyperglycemic microenvironment by catalyzing glucose, leading to a significant increase in H 2 O 2 production, which is subsequently converted into bactericidal •OH through POD activity. Furthermore, H 2 O 2 can be catalyzed into H 2 O and O 2 via the CAT pathway, thereby alleviating inflammation caused by the excessive accumulation of reactive oxygen species. In vitro antibacterial assays demonstrated that the GOx-CeO 2 @MQD system achieved remarkable bactericidal efficiencies of 99.99% against E. coli and S. aureus at concentrations of 12.5 ppm and 2.0 ppm, respectively. In vivo experiments further revealed that GOx-CeO 2 @MQD significantly promoted angiogenesis, accelerated wound epithelialization, and induced a strong anti-inflammatory response, thus facilitating the regeneration of infected diabetic skin. This study proposes a novel approach for diabetic wound treatment by harnessing the synergistic effects of multiple enzyme-like activities.
研究领域:
生物材料学
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医学
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纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xianglei Liu,Chuang Bao,Zhonghui Zhu,Hangbin Zheng,Chao Song,Qiao Xu
Methanol steam reforming (MSR) is considered as an effective method for hydrogen storage and generating high-quality hydrogen for fuel cells. In this work, mesoporous Cu/TiO 2 –CeO 2 catalysts are proposed to achieve efficient MSR based on synergetic effects of thermal and photon energies . Optimal Ti/Ce molar ratio is found to be 2:1, for which excellent methanol conversion of 100% and extremely low CO selectivity of 2.2% are achieved for thermal catalysis. Further applying UV light (280–400 nm) irradiation while keeping the same temperature, the hydrogen production rate is enhanced to be 78.8 mmol/h/g from 58.6 mmol/h/g. The underlying mechanism is attributed to photogenerated electron hole pairs promoting the REDOX reaction of intermediate product methyl formate based on in situ diffuse reflectance infrared fourier transform spectra (DRIFTS). This work provides a new method to enhance methanol steam reforming performance via thermo-photo synergic effects, and paves a way for the development of direct solar driven MSR techniques.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）