APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jiabai Cai,Xueqing Wu,Shunxing Li,Fengying Zheng
Visible-light-driven photocatalysis as a green technology has attracted a lot of attention due to its potential applications in environmental remediation. Although TiO 2 is the most popular photocatalyst, the lack of visible light utilization and a low efficiency of electron-hole separation should be overcome. Therefore, Au nanoparticles (NPs) as cocatalyst were controllably loaded between the double-shell or into CeO 2 shell (as photocatalyst and oxygen buffer) and then a novel visible-light-driven TiO 2 @CeO 2 nanocomposite was prepared, using functionalized polystyrene spheres, sol-gel, hydrothermal reaction, and calcination. The presence of TiO 2 shell, Au NPs and CeO 2 shell were confirmed by EDX and electron energy loss mapping analysis. Under visible-light irradiation, the photo-degradation rate constant k (min −1 ) was in the order of TiO 2 @Au@CeO 2 (0.026) > TiO 2 @CeO 2 /Au (0.021) > TiO 2 @CeO 2 (0.014) > CeO 2 (0.0091) > TiO 2 (0.0046) > P25 (0.0034). Compared with P25, TiO 2 @CeO 2 , and TiO 2 @CeO 2 /Au, the visible-light photocatalytic activity of TiO 2 @Au@CeO 2 for the photo-degradation of organic pollutant and photo-reduction of Cr(VI) were the highest. This result was attributed to the combination of TiO 2 and CeO 2 , the double-shelled and sandwiched nanostructure and the addition of Au NPs as electron trap site and surface plasmon resonance-sensitizer, which could reduce the recombination of the electron-hole and induce the visible light absorption. The major obstacle of heterogeneous photocatalysis could be resolved. The photo-degradation rate of 95% was achieved by TiO 2 @Au@CeO 2 , which exhibited an increase of 63% compared to Degussa P25 TiO 2 . The photo-degradation activity of TiO 2 @CeO 2 /Au was improved by Au NPs loaded on outer shell of TiO 2 @CeO 2 /Au but limited by their stability. This work confirmed the importance of controllable location of the noble metals as cocatalysts.
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
高影响因子
Journal of Manufacturing Processes
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2023
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IF 6.2
Yongchao Xu,Guangen Zhao,Qianting Wang,Youji Zhan,Bingsan Chen
Toxic and polluted ingredients are normally employed in the chemical mechanical polishing of sapphire wafers, which results in widespread environmental pollution. Thus, developing a novel green polishing technology is a significant challenge to achieve ultra-smooth and efficient polishing. In this study, novel CeO 2 coated diamond composite abrasives were used in the semi-fixed abrasive polishing of sapphire wafers, which were successfully synthesized by a modified precipitation approach without using explosive hazardous chemicals . During the whole polishing process, the polishing slurry only contains deionized water, without any other chemical reagents, to avoid environmental pollution. Polishing results showed that the surface roughness of sapphire polished by the composite abrasives was reduced to 6.1 nm, which was 26.5 % lower than that of pure diamond. Meanwhile, the material removal rate was 1.46 nm/min, with an improvement of 10.6 %, as well as a reduction in residual stress by approximately 29.8 %. Combined with the theory of micro-contact mechanics, the polishing mechanism and interfacial contact behavior of composite abrasives were investigated in depth through the analysis of polished sapphire surface and wear debris. The improvement of polishing performance may be attributed to the enhancement of solid-state reaction and its mutual balance with the mechanical removal action of composite abrasives.
研究领域:
材料科学
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环境工程
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机械工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Song Guo,Wuzhu Sun,Weiyi Yang,Zhengchao Xu,Qi Li,Jian Ku Shang
One-dimensional nanomaterials may organize into macrostructures to have hierarchically porous structures, which could not only be easily adopted into various water treatment apparatus to solve the separation issue of nanomaterials from water but also take full advantage of their nanosize effect for enhanced water treatment performance. In this work, a novel template-based process was developed to create Mn3O4/CeO2 hybrid nanotubes, in which a redox reaction happened between the OMS-2 nanowire template and Ce(NO3)3 to create hybrid nanotubes without the template removal process. Both the Ce/Mn ratio and the precipitation agent were found to be critical in the formation of Mn3O4/CeO2 hybrid nanotubes. Because of their relatively large specific surface area, porous structure, high pore volume, and proper surface properties, these Mn3O4/CeO2 hybrid nanotubes demonstrated good As(III) removal performances in water. These Mn3O4/CeO2 hybrid nanotubes could form paper-like, free-standing membranes spontaneously by a self-assembly process without high temperature treatment, which kept the preferable properties of Mn3O4/CeO2 hybrid nanotubes while avoiding the potential nanomaterial dispersion problem. Thus, they could be readily utilized in commonly used flow-through reactors for water treatment purposes. This approach could be further applied to other material systems to create various hybrid nanotubes for a broad range of technical applications.
研究领域:
材料科学
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环境科学
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纳米技术
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DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2021
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IF 7.46
Xiaoyu Zheng,Lin Xing,Xuemei Zhou,Yulian Tang,Zhen Liu,Xueting Zhang,Lei Hu,Zhengquan Yan
To monitor toxic NO 2 − and S 2− conveniently and effectively in 100% aqueous, nano CeO 2 was identified and modified first onto 2-dimensional Co 3 O 4 substrate (CeO 2 @2D Co 3 O 4 ) under microwave-assisted conditions at 140 °C. The obtained CeO 2 @2D Co 3 O 4 expressed excellent stability and superior oxidase-mimic activity with a wide temperature range from 20 to 60 °C. Under the optimized conditions (pH 4.0, 25 °C, 0.07 mM TMB), CeO 2 @2D Co 3 O 4 could accelerate the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation (oxTMB) within 12 min at room temperature , whose Michaelis constant ( K m ) and maximal reaction rate ( v max ) were 0.017 mmol/L and 2.17 × 10 −7 mol/L·s –1 respectively. Especially, both NO 2 − and S 2− could exclusively make the blue CeO 2 @2D Co 3 O 4 -TMB system into colorless and green respectively, expressing significant visibility. When applied for visual detection of NO 2 − and S 2− in real water, soil, drink and food samples, the recoveries were 97.6~104.6% and 97.5~104.1% with low detection limits of 3.26 × 10 −9 mol/L and 6.65 × 10 −8 mol/L (S/N = 3), far below the maxima in drinking water permitted by World Health Organization (WHO). The strengthened oxidase-mimic activity of CeO 2 @2D Co 3 O 4 and its different recognition mechanisms to NO 2 − and S 2− were studied in detail.
研究领域:
环境科学
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生物化学
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材料科学
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2025
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IF 4.7
Jiale Zhang,Xiaohu Qu,Jianhang Yin,Ning Wang
With the development of advanced electronic packaging, a big challenge for the chemical mechanical polishing (CMP) is to achieve the global planarization of EMC (epoxy molding compound)- Si -Cu materials with the normal ceramic abrasives. In this paper, the SiO 2 @CeO 2 core-shell composite abrasive is developed for the CMP of EMC/Si/Cu materials for the first time, and a global planarization with low removal selectivity is expected owing to the synergistic effect of the core-shell abrasives. Two sol-gel synthetic strategies, i.e., oil bath and ultrasonication, are proposed for the controllable synthesis of the SiO 2 @CeO 2 abrasives, which exhibit a good dispersive stability with a large absolute zeta potential >30 mV. The slurry for the CMP of EMC-Si-Cu based on the SiO 2 @CeO 2 abrasives shows the advantage in controlling the surface roughness, material removal rate and the removal selectivity. Especially, the ultrasonic SiO 2 @CeO 2 abrasives give rise to the low surface roughness (Cu 2 nm, Si 0.3 nm, EMC 10 nm) and the low removal selectivity (Cu/EMC/Si = 1.58:1.56:1.00). Therefore, the proposed SiO 2 @CeO 2 core-shell abrasives and the developed CMP slurry opens an alternative way for the planarization of EMC/Si/Cu materials in the advanced electronic packaging.
研究领域:
材料科学
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电子封装技术
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产品关联
DOI
高影响因子
FIBERS AND POLYMERS
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2025
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IF 2.3
Yan Zhiqi,Li Xinmei,Yang Rui,Jia Liming
To address the global challenge of fossil fuel consumption, a self-supporting supercapacitor electrode material was successfully fabricated to enable efficient utilization of renewable energy. In this study, lignin/polyacrylonitrile (PAN) carbon nanofibers (LCNFs), prepared via electrospinning, served as a conductive scaffold and growth substrate. This enabled the in situ growth of NiCo 2 O 4 and CeO 2 , co-constructing a composite electrode material (denoted as CeO 2 /NiCo 2 O 4 @LCNFs) characterized by a petal-like nanosheet architecture. Results indicate that, compared to LCNFs, this uniquely structured composite enhances the exposure of active sites and facilitates charge and ion transport, thereby leading to significantly improved electrochemical performance. Furthermore, the influence of varying Ce content on the morphology, structure, and electrochemical properties of the composite was investigated. The CeO 2 /NiCo 2 O 4 @LCNFs composite exhibited optimal morphology and electrochemical properties when the Ce addition amount was 0.5 mmol. It delivered a specific capacitance of 643.6 F g -1 (at 0.5 A g -1 ) and maintained a capacitance retention of 82.07% after 5000 cycles at 5 A g -1 . These results demonstrate the promising application potential of this electrode material and offer new perspectives for the development of novel electrode materials.
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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储能
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
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2025
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IF 11
Wang Ding,Qin Rui-Jie,Yu Jie-Jie,Hu Jin-Wu,Zhang Wen-Hui,Xu Hui,Xu Jing-Cheng,Liao Qiao-Bo,Li Hui-Jun,Wang Xu-Hui
The semiconductor gas sensors used for xylene gas detection in real time has been restricted by the inadequate sensitivity and selectivity. Constructing a bilayer cascade sensor with the catalysis-gas sensitivity synergistic is considered as an effective solution. Herein, the Ag@CeO 2 nanosheets are synthesized by heat treating the Ag@Ce-MOF, which synthesized via solvothermal method. The morphological evolution of cerium metal–organic framework (Ce-MOF), regulated by Ag ions, is investigated, and the transformation mechanism is proposed. The bilayer sensors were constructed by using WO 3 nanofibers, prepared via the electrospinning method, as the sensitive layer and the Ag@CeO 2 nanosheets as the catalytic layer, respectively. The bilayer sensors exhibit remarkable performance in response to xylene. The response value ( R a / R g ) of WO 3 /Ag@CeO 2 sensor to 10 ppm xylene gas reaches 32.13 at the operating temperature of 160 °C. Additionally, the sensor displays an exceptional response to even trace amounts of xylene, as low as parts per billion (ppb). The catalysis-gas sensitivity synergistic mechanism was elucidated by capturing catalytic intermediates using online mass spectrometry. These findings provide a novel strategy for benzene series (BTEX) sensor and offer a novel approach to prepare two-dimensional Ce-MOF and its derived materials with tailored properties. Graphical abstract
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
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2022
·Vol. 53
·期 7
·2665-2679
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IF 2.726
Yu Zhitao,Chen Minghui,Wang Qunchang,Wang Fuhui
Abstract Metal matrix self-lubricating composites are required to possess well-balanced mechanical and lubricating properties when they are applied as mechanical parts. However, the decomposition of disulfide lubricants usually occurs during the sintering process and unfortunately reduces their mechanical properties. In this work, CeO 2 was added to a model Cu/WS 2 composite fabricated by spark plasma sintering (SPS). The effect of CeO 2 doping on the interfacial microstructure and mechanical and tribological properties was investigated. The results indicated that CeO 2 nanoparticles preferentially adsorbed onto the lubricant disulfide, which segmented the Cu/WS 2 diffusion layer and reduced Joule heat at the interface while competing with WS 2 to intensify the heat dissipation. As a consequence, interfacial overheating was largely suppressed, and WS 2 decomposition was successfully prevented. The CeO 2 -doped Cu/WS 2 composite breaks through a trade-off between mechanical and lubricating properties, exhibiting a high bending strength of 295.1 MPa, a hardness of 98.5 HV, a low friction coefficient of 0.19, and a wear rate as low as 4.12 × 10 −5 mm 3 /N m. Graphical Abstract
研究领域:
材料科学
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机械工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
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IF 2.986
Hualin Jiang,Menglin Li,Jun Liu,Xueqin Li,Lei Tian,Pinghua Chen
In this study, a novel CeO 2 -TiO 2 nanocomposite denoted as CeO 2 -3TiO 2 was successfully synthesized via a facile one pot hydro-thermal method without alkali. It exhibits high photocatalytic reduction reactivity toward Cr(VI) under visible light. The photocatalytic reactivity of CeO 2 -3TiO 2 is 18 times higher than that of pure CeO 2 , 28 times higher than pure TiO 2 , 15 times higher than the sample of simply mixed CeO 2 and TiO 2 . The solution with Cr(VI) initial concentration of 2780 ppb can be fast photoreduced by CeO 2 -3TiO 2 in 60 min under visible light to meet the criterion of U.S. Environmental protection Agency. Characterization results indicate CeO 2 -3TiO 2 has the good crystal form of heterojunction structure, narrow pore size distribution , narrow energy gap and high photogenerated electron-hole separation efficiency. Based on the experimental results, a speculated photocatalytic mechanism was proposed.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2021
·Vol. 96
·期 6
·1523-1532
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IF 3.174
Shiting Xu,Xixi Chen,Shujuan Zhan,Shuanghong Tian,Ya Xiong
BACKGROUND To strengthen the treatment efficiency of photocatalytic ozonation, it is necessary to develop a stable bifunctional catalyst active in both processes of photocatalysis and catalytic ozonation. RESULTS A series of Fe doped CeO 2 nanocubes with the main exposure of active (100) crystal facets were simply synthesized by a one-pot hydrothermal method and applied in photocatalytic ozonation for the first time. It was found that doping did not change the morphology of nanocubes but it decreased the crystal size, induced abundant defects of oxygen vacancies and Ce 3+ , and shifted the optical absorption edge to the visible region. Due to these structure modifications, Fe doped CeO 2 nanocubes enhanced the mineralization rate of 4-chlorophenol by 55.4–74.7% and reduced the formation of carcinogenic bromate by 60.2–85.4%, depending on the doping content. Due to the simultaneous occurrence of photocatalysis, catalytic ozonation, and their synergy in 5%Fe-CeO 2 mediated photocatalytic ozonation under solar irradiation, 4-chlorophenol almost completely degraded within 9 min, 74.7% of mineralization rate was achieved within 45 min, and the first order kinetics reaction constant reached 2.97 × 10 −2 ·min −1 , about 4.1 times that of photo ozonation without any catalysts. Moreover, the introduction of 5%Fe-CeO 2 to the ozonation, photolysis, and photo ozonation decreased the corresponding energy consumption by 60.2%, 84.2%, and 62.5%, respectively. CONCLUSION In this study, an efficient and economical Fe doped CeO 2 nanocubes-mediated photocatalytic ozonation process was successfully developed for the refractory organics-containing wastewater treatment under solar light irradiation. © 2021 Society of Chemical Industry
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Kangning Wang,Mengran Qin,Chuantao Wang,Ting Yan,Yanzhong Zhen,Xiaolei Sun,Jianwei Wang,Feng Fu
The construction of composite materials is an effective strategy to solve the problems of poor conductivity, manganese dissolution, and volume expansion of manganese-based materials. Herein, a CeO 2 /MnO x @C hollow composite cathode derived from the self-assembly of Ce-Mn-metal-organic frameworks (Ce-Mn-MOFs) was synthesized. The abundant oxygen vacancies and good electronic/ionic conductivity of CeO 2 improve the electrical conductivity of composite, enhancing the rate performance. The unique hollow structure could inhibit manganese dissolution and alleviate volume expansion. The results indicate that the 1 % CeO 2 /MnO x @C composite cathode possesses a high reversible capacity and excellent cycling stability. Specifically, the 1 % CeO 2 /MnO x @C composite cathode shows a remarkable reversible specific capacity of 130 mAh/g at a current density of 500 mA g −1 , 6.5 times more than the pure MnO x (20 mAh/g). The capacity retention is up to 99.5 % relative to the initial capacity after 800 cycles. This study provides a new strategy for designing rare-earth composite electrodes to improve electrochemical performance.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Huiling Fan,Yuqi Qin,Long Li,Jiansheng Cui,Chenqiang Yang,Zhanhui Wang,Lili Duan,Yihong Wang,Liang Tian
Herein, a biosensing system was designed based on tripedal DNAzyme walker integrated nanoprobe signal amplification strategy for realizing ultrasensitive determination of the microRNA-21. In this work, the two-dimensional MoSe 2 /MXene nanocomposite with high electronic conductivity was synthesized as electrode signal amplification materials to immobilize more capture DNA and accelerate electron transport. After adding microRNA-21, the tripedal DNAzyme walker was activated on the surface of the Pt@CeO 2 nanoclusters, which were as nanozyme to construct the high-performance nanoprobe machine. Then, the tripedal DNAzyme strands could cleave the substrate strands and walk onto the nanoprobe for amplifying the signal remarkably. Furthermore, the detectability of the electrochemical biosensor was verified by DPV, acquiring a wide linear response in a range of 0.1 fM to 1 nM, as well as the limit of detection was 0.04 fM. Hence, such double signal amplified strategy could not only provide excellent selectivity and specificity, but also achieve superior repeatability and stability in real complex serum samples. Therefore, the designed biosensing platform detected different microRNA through modulating the recognition sequence, which might provide a general strategy for various cancer analyses and have a promising potential for clinical application.
研究领域:
生物化学
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分子生物学
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医学诊断
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）