CATALYSIS LETTERS
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2024
·
IF 2.3
Ren Zongli,Zhao Zhongwei,Ma Xin,Zhang Weiwei
Construction of multi-interface contact step-scheme (S-scheme) photocatalyst is a promising pathway to achieve high-electron transfer efficiency for photodegradation estrone and congo red. In this paper, g-C 3 N 4 is chosen as the main photocatalyst, CeO 2 nanosheet with the unique Ce 4+ → Ce 3+ conversion performance and Fe 3 O 4 -Reduced graphene oxide are loaded onto the g-C 3 N 4 surface to bulid 2D-2D magnetic photocatalyst. The 2D–2D magnetic photocatalyst structure imparts reusability by magnetic retrieval and at the same time Fe 3 O 4 -Reduced graphene oxide acts as an efficient host for g-C 3 N 4 /CeO 2 composite photocatalyst. The photocatalytic performance is examined using etsrone and congo red. Photodegradation studies show the CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide a composite catalyst can degrade 71% of estrone, 92% of congo red and 89% phenanthrene, Free radical scavenger test shows superoxide and hydroxyl radical species play a major role in the degradation. Furthermore, it is demonstrated that the magnetic CeO 2 /g-C 3 N 4 / Fe 3 O 4 -Reduced graphene oxide possesses strong antibacterial properties against Proteus mirabilis and Escherichia coli. A three-factor-three-level Box–Behnken design (BBD) was selected to optimize three greatly influential parameters: light irradiation time (min), The quality of photocatalyst(mg) and pollution concentration(ppm) by response surface methodology. It is expected that CeO 2 /g-C 3 N 4 / Fe 3 O 4 - Reduced graphene oxide can be used as a 2D–2D magnetic photocatalyst for to achieve its valorization, which have very broad development prospects in the field of environmental remediation or catalysis. Graphical Abstract
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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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2017
·
IF 6.065
Shunxing Li,Jiabai Cai,Xueqing Wu,Biwen Liu,Qiaoying Chen,Yuehai Li,Fengying Zheng
An solar-light-driven and bifunctional photocatalyst was designed for photo-reduction of Cr(VI) and selective photo-oxidation of benzyl alcohol into benzaldehyde in the presence of water under ambient conditions. Double-shelled and sandwiched TiO 2 @Pt@CeO 2 hollow spheres were prepared by using functionalized polystyrene spheres, sol-gel, hydrothermal reaction, and calcination. The Pt nanoparticles (NPs) were controllably loaded between the TiO 2 shell and CeO 2 shell. Under solar-light irradiation, the photo-reduction rate of Cr(VI) (μmol h −1 ) was in the order of TiO 2 @Pt@CeO 2 (1.901) > TiO 2 @CeO 2 (1.424) > TiO 2 (1.040) > CeO 2 (0.992). Among the above-mentioned photocatalysts, the conversion rate of benzyl alcohol for TiO 2 @Pt@CeO 2 was also the best. These results were attributed to the combination of TiO 2 and CeO 2 as photocatalyst and oxygen buffer, the double-shelled and sandwiched nanostructure, and the addition of Pt NPs as cocatalyst and electron trap site, which could store and shuttle photo-generated electrons, reduce the recombination of the electron-hole, and then enhance photo-generation of active radicals. This conclusion was verified by the electron paramagnetic resonance (EPR) spectroscopy. Considering the versatile combination of photocatalyst, oxygen buffer and cocatalyst, this work could provide new insights into the design of high-performance bifunctional photocatalysts for heavy metal removal and selective synthesis.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 19
·6339-6348
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IF 2.371
He Beibei,Zhao Qingguo,Zeng Zhigang,Wang Xiaohong,Han Sheng
Au@CeO 2 core–shell nanostructure catalysts were synthesized by hydrothermal reaction method. The effect of hydrothermal reaction time and calcination temperature on the textural and morphological characteristics of the catalyst was investigated by TEM, SEM, XRD, XPS, ICP, UV–Vis, and N 2 adsorption–desorption techniques. The results proved that gold core and CeO 2 shell formed simultaneously at the beginning of the reaction. By extending the hydrothermal reaction time, both the grain size of Au core and CeO 2 shell increased. The crystallization degree of CeO 2 and the interaction between Au and CeO 2 were also enhanced. The 90 % CO conversion temperature (T 90 % ) of Au@CeO 2 declined from 187 to 142 °C with the hydrothermal reaction time extended from 6 to 20 h. After 70-h reaction, the catalytic activity was still maintained without any loss. The effect of the calcination temperature on the catalytic performance was also investigated and it turned out that high calcination temperature has a positive influence on the catalytic activity. The likely active sites are the interface between Au core and CeO 2 shell. Gold content, metal–support interaction (MSI), and oxygen vacancy are all related to the activity. The excellent performance of 20 h-600 °C-Au@CeO 2 in catalytic activity and stability results from the joint effects of these triple factors.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115526
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IF 1.449
Kuibao Zhang,Baozhu Luo,Haibin Zhang
In this study, zirconolite-based ceramic powder was firstly fabricated from combustion reaction route. CeO2 was introduced as the surrogate of tetravalent actinides, which was directly immobilized by the single-phase zirconolite waste matrice. The results demonstrate that the crystalline incorporation of CeO2 is highly depended on the sintering temperature. 10 wt% CeO2 was directly immobilized into the zirconolite crystal structure under 1250 °C sintering, where Ce concurrently occupies the Ca and Zr sites. Higher CeO2 incorporation (15–25 wt%) leads to the formation of Ce-rich impurity phase and phase transformation from 2M-zirconolite to 3T-zirconolite. The Ce-bearing zirconolite waste forms exhibit the highest density and hardness after sintering at 1400 °C for 12 h. The aqueous durability was evaluated, where the 42 days LRCe values are 1.68 × 10–6 and 6.85 × 10–6 gm−2d−1 before and after the leachate treatment using nitric acid.
研究领域:
材料科学
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核废料管理
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陶瓷
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环境科学
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Guowei Wang,Xue Ma,Jue Liu,Lifan Qin,Bing Li,Yuanan Hu,Hefa Cheng
A novel direct Z-scheme NiGa 2 O 4 /CeO 2 nanocomposite was designed and prepared via simple sol-hydrothermal and calcination methods, and its sonocatalytic activity was tested by studying the degradation of a model antimicrobial agent, malachite green (MG), under ultrasonic irradiation. Near complete (96.2%) degradation of MG (at 10 mg/L) could be achieved by the NiGa 2 O 4 /CeO 2 nanocomposite (at 1.0 g/L) after ultrasonic irradiation (40 kHz, 300 W) for 60 min at 25 °C. Under the same conditions, only 51.2 and 72.0% of the MG degraded in the presence of NiGa 2 O 4 and CeO 2 (at 1.0 g/L), respectively. These results demonstrate that the direct Z-scheme NiGa 2 O 4 /CeO 2 nanocomposite has excellent sonocatalytic activity, which is attributed to the matching band-gaps between NiGa 2 O 4 and CeO 2 . The sonocatalytic activity of NiGa 2 O 4 /CeO 2 nanocomposite decreased by 17% after four cycles of reuse, which is indicative of relatively good reusability. Scavenging experiments revealed that sonocatalytic degradation of MG results from the combined action of hydroxyl radicals ( OH) and holes (h + ), with the latter having a greater contribution. The pathways and mechanism of MG degradation were proposed based on the degradation intermediates detected. The results demonstrate that the prepared direct Z-scheme NiGa 2 O 4 /CeO 2 nanocomposite worked as designed and exhibited high and stable sonocatalytic activity during MG degradation, and could thus serve as a promising candidate in sonocatalytic treatment of other organic pollutants in wastewaters. The findings also provide new insights on the mechanism of sonocatalytic degradation and the design of efficient Z-scheme sonocatalysts.
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
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2020
·
IF 3.784
Lianbo Wang,Shilong Xing,Huabing Liu,Chuanhai Jiang,Vincent Ji
In the present work, CeO 2 nanoparticles were extra added into Ni Ti nanocomposite coating to optimize the spatial microstructures and wear properties. Before adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles distributed in forms of cluster in Ni deposits, leading to the spatial inhomogeneity of microstructures like local large grains and residual [200] fiber textures. Correspondingly, the hardness in small-grain regions was up to ~4456 ± 46 MPa, while the hardness in large-grain areas dropped to values as low as ~3493 ± 40 MPa. Besides that, inside pores and jagged surface were observable, confining the wear resistance capacity. The average hardness was ~3814 ± 279 MPa. After extra adding CeO 2 nanoparticles into Ni Ti nanocomposite coating, Ti microparticles homogeneously scattered throughout the whole nanocomposite coating, leading to the spatial homogeneity of microstructures and properties. Grain size steadily kept at ~40 nm and the hardness stabilized at ~4326 ± 150 MPa. Inside pores vanished, the surface became smooth, and residual [2 0 0] texture was fractured. Benefiting from the modified spatial microstructures and improved hardness, enhanced wear resistance was achieved.
研究领域:
材料科学
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表面工程
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纳米技术
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产品关联
DOI
高影响因子
Analytical Methods
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2021
·Vol. 13
·期 39
·4634-4641
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IF 2.896
Qiu Sun,Jiyu Du,Li Tian,Jianfeng Wu,Xuelin Zhang
In this paper, the catalytic activity of CeO2 NPs toward oxime oxidation was adopted for the first time to develop an electrochemical sensor with improved sensitivity toward the direct detection of organophosphorus pesticides (OPs) without electrochemical redox activity. To enhance the conductivity of the sensor, CeO2 NPs together with multi-walled carbon nanotubes (MWCNTs) were deposited onto a bare glassy carbon electrode (GCE) by the simple method of drop-casting. The electrochemical properties of the as-prepared sensor were evaluated in K3[Fe(CN)6] solution and the oxidation behavior of pralidoxime (PAM) chloride on the electrodes was characterized by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results show that the modification of CeO2 onto the electrode not only increases the electroactive area of the electrode but also significantly increases the peak current of PAM chloride oxidation, which confirms that CeO2 has an electrocatalytic effect toward oxime oxidation. To evaluate the sensitivity of the as-fabricated sensor, the inhibition rate of PAM chloride peak current was tested in PAM chloride solution containing different concentrations of chlorpyrifos, which shows a very small detection limit of 2.5 × 10−9 M. In addition, the sensor successfully achieved a convenient and sensitive determination of OPs in vegetable extracts.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Zhihua Zhao,Xianghao Meng,Ayesha Yousaf,Zhigang Shao,Lan Wu
MoO 3 nanorods, successfully modified with CeO 2 , were synthesized using the hydrothermal technique and subsequently utilized for gas detection. Various techniques were employed to test and analyze the MoO 3 /CeO 2 materials. Numerous characterizations have confirmed that the synthesized MoO 3 /CeO 2 possesses excellent properties. The synthesized MoO 3 nanorods demonstrated uniformity in size, with an approximate diameter of 146 nm. CeO 2 nanoparticles were distinctly visible on the surface of the MoO 3 nanorods. The MoO 3 /CeO 2 sensor demonstrated significantly enhanced sensing performance for triethylamine at 240 °C. Specifically, the MoO 3 /CeO 2 sensor exhibited a reactivity of 73.1 to 20 ppm of triethylamine, signifying an improvement of 3.5 times compared to the reactivity of the MoO 3 nanorods. The sensor based on MoO 3 /CeO 2 exhibited high selectivity, good repeatability, and a lower detection limit for TEA. The enhancement of the gas-sensing performance of the MoO 3 /CeO 2 sensor may have been attributed to the accelerated electron transfer facilitated by the heterojunction formed between MoO 3 and CeO 2 . Additionally, underlying sensing mechanism was investigated using Density Functional Theory (DFT) methodologies.
研究领域:
材料科学
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传感器技术
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食品检测
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Qiuli Zhang,Jiahui Liu,Saifei Hu,Chengxian Yin,Naixin Lv,Rong Wei
Metal-organic framework (MOF) materials have significant advantages in corrosion protection due to their remarkable specific surface area and exceptional porosity. This work combined cerium dioxide (CeO 2 ) nanoparticles and zeolitic imidazolate framework-7 (ZIF-7) with the long-chain hydrophobic agent hexadecyltrimethoxysilane (HDTMS) to create a composite nanostructure (CeO 2 @ZIF-7@HDTMS) with a multistage barrier function. The structure takes CeO 2 nanoparticles as the core to achieve chemical corrosion inhibition by using its oxygen-deficient property; ZIF-7 is induced to form an ordered microporous adsorption layer at its periphery by surface carboxylic acid molecules; and ultimately, the outer repulsive barrier is constructed with the help of hydrophobic modification of HDTMS, thus forming a synergistic anticorrosion mechanism in three dimensions, namely physical barrier, chemical passivation, and hydrophobic protection, and constructing a ‘Physical barrier + double synergistic corrosion inhibition’ three-level protection system. The successful preparation of CeO 2 @ZIF-7@HDTMS nanoparticles was confirmed by a number of characterization tools, such as field emission scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FT-IR). Subsequently, they were well characterized by electrodynamic polarization curves, electrochemical impedance spectroscopy (EIS), and salt spray test aspects, which indicated that CeO 2 @ZIF-7@HDTMS epoxy composite coatings have good corrosion protection and hydrophobic properties. After 60 days of immersion, EIS analysis showed that the impedance of the 1.0 % EP/CeO 2 @ZIF-7@HDTMS coating was still as high as 4.636 × 10 8 Ω·cm 2 and its low-frequency impedance was about two orders of magnitude higher than that of the pure epoxy coating, which further indicated that the composite coating could provide excellent corrosion resistance and durability. In conclusion, CeO 2 @ZIF-7@HDTMS nanoparticles as fillers offer an innovative idea for the development of multifunctional and long-life anticorrosive coatings, broaden the application of metal oxide@MOF composites, and open up a new direction for the design and preparation of nanostructured materials.
研究领域:
材料科学
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腐蚀防护
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纳米技术
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Xuan Miao,Xiao Bai,Peng Zhang,Bolong Wang,Shuyan Wang,Yuzhu Yang,Zenggang Lin,Sixia Li,Binbin Wang,Weisheng Liu
Incorporating two-phase heterojunctions with matching band structures represents a promising strategy for developing photocatalysts with enhanced efficiency. This work prefers a novel approach that employs a template-assisted strategy based on a porous structured UCCN@CeO2 0D/2D S-scheme heterojunction. The proposed method aims to improve photocatalytic activity by harnessing the synergistic effects of monodispersed CeO2 nanoparticles and ultrathin N-defect CN nanosheets. The catalyst demonstrates a remarkable photocatalytic hydrogen evolution rate, reaching an impressive value of 5.59 mmol h–1 g–1 when subjected to simulated sunlight irradiation. Furthermore, the photocatalyst maintains a substantial activity level, yielding 2.35 mmol h–1 g–1 under visible light (≥400 nm). The significant improvement in the photocatalytic performance of the UCCN@CeO2 catalyst is attributed to the unique structural design and effective charge separation facilitated by the S-scheme mechanism. Kelvin probe force microscopy, theoretical calculations, and femtosecond transient absorption spectroscopy affirm the efficient charge transportation across the catalyst interface. Additionally, electron spin resonance spectroscopy measurements further support the charge transfer pathway in the S-scheme. This research presents an innovative approach for designing and developing CN-based catalysts featuring S-scheme heterojunctions, aiming to improve their efficiency and practical use in photocatalytic applications.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 17
·2963-2971
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IF 4.872
Yongbei Zhao,Qi Wang,Jianxiu Li,Hongmin Ma,Yong Zhang,Dan Wu,Bin Du,Qin Wei
In this paper, amidogen graphene (NH2-Gr) and Au nanoparticle (NP) functionalized cerium oxide (CeO2) NPs (NH2-Gr/Au@CeO2) have been synthesized. The prepared NH2-Gr/Au@CeO2 exhibits strong electrochemiluminescence (ECL) activity which could be quenched efficiently by bismuth sulfide (Bi2S3). Based on this principle, a novel sandwich ECL immunosensor was constructed for the detection of prostate specific antigen (PSA). NH2-Gr was used as a loading matrix for CeO2 NPs because of its superior conductivity and a large surface area. Au NPs were used to combine anti-PSA 1 (Ab1) to CeO2via the Au–NH2 covalent bond and meanwhile to enhance the sensitivity of the immunosensor. NH2-Gr/Au@CeO2 was used as the ECL response layer. Ag NP functionalized Bi2S3 was used to label the secondary antibody (Ab2). After a sandwich-type immunoreaction, a remarkable decrease of the ECL signal was observed. The signal-off sensor showed a wide linear range response from 1 pg mL−1 to 10 ng mL−1 with a low detection limit (LOD) of 0.3 pg mL−1. The applicability of the proposed ECL immunosensor was evaluated by detecting PSA in human serum samples.
研究领域:
生物医学工程
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分析化学
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DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2018
·Vol. 2018
·期 35
·3952-3959
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IF 2.507
Miaomiao Liu,Zhenyuan Ji,Xiaoping Shen,Hu Zhou,Jun Zhu,Xulan Xie,Chunsen Song,Xuli Miao,Lirong Kong,Guoxing Zhu
Graphical The 3D-rGO-CeO 2 composite based on three-dimensional rGO and CeO 2 hollow microspheres was successfully synthesized by a hydrothermal self-assembly approach, which showed an enhanced electrocatalytic performance for a hydrogen evolution reaction in an alkaline medium. Transition metal oxides (TMO) are promising candidates for low-cost and high-efficiency catalysts for the hydrogen evolution reaction (HER). However, the low conductivity and severe agglomeration of catalyst particles hinder their practical application. Herein, we report an effective HER electrocatalyst of 3D-rGO-CeO 2 with three-dimensional reduced graphene oxide (3D-rGO) decorated with CeO 2 hollow microspheres through a hydrothermal self-assembly approach. It is shown that the CeO 2 hollow microspheres with an average size of ca. 680 nm are uniformly encapsulated within the porous structure of 3D-rGO. Compared with bare CeO 2 hollow microspheres, the 3D-rGO-CeO 2 composite exhibits remarkably enhanced electrocatalytic activity for HER with a relatively low onset overpotential of 192 mV, a smaller overpotential of 0.34 V at the current density of 10 mA cm –2 , and a modest Tafel slope of 112.8 mV decade –1 in a 1 m KOH solution. The enhanced performance of 3D-rGO-CeO 2 can be ascribed to the introduction of 3D rGO in the composite, which provides a highly conductive network for rapid charge-carrier transmission, and rich porous structures for the easy access of the electrolyte to the catalyst during the HER process.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
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