Kebin Zhou

Technical Institute of Physics and Chemistry, Peping, Beijing, China

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Publications (29)127.71 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A series of amphiphilic carbonaceous microspheres-supported Pd catalysts have been prepared and their performances for the hydrodeoxygenation of vanillin have been investigated in both a pure aqueous phase and in water–oil biphasic systems. The wettability of the catalyst could be facilely tuned by adjusting the hydrothermal treatment temperature during the synthesis of the carbonaceous microspheres or by a post-treatment process in alkaline solution. In the aqueous phase reactions, the more hydrophilic the catalyst, the more active it was for the hydrodeoxygenation of vanillin. And the wettability of the support affects the activity through the interaction between the catalysts and substrates/products. In the case of a water–oil biphase, the wettability of the support played a key role in forming Pickering emulsions. It was found that the selectivity of the hydrodeoxygenation reactions was determined by the type of Pickering emulsion and high selectivity of p-creosol could be achieved in the water-in-oil emulsion systems.
    Green Chemistry 04/2014; 16(5). · 6.83 Impact Factor
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    ABSTRACT: Baby face: Interface engineering of ceria‐supported Au catalysts was achieved by a combination of DFT calculations and synthetic techniques. The reducibility of the Au/ceria catalysts was determined by the interfacial AuOCen structures.
    ChemCatChem 06/2013; 5(6). · 5.18 Impact Factor
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    ABSTRACT: Nanoceria has been demonstrated as a potential antioxidative nano-drug. However, its short residence time in the body, toxic solvents involved in the synthesis processes, and especially the poor water solubility hinder its potential clinical applications. In this work, water-soluble chitosan-coated nanoceria particles (CNPs) are synthesized by a facile wet chemical route. The molar weight (MW) and concentration of chitosan do not affect the particles' size and the antioxidative activity of the CNPs over a wide range, and the mechanism is explored further. The behavior of CNPs over time and with a change of pH value were also examined. The CNPs reveal excellent antioxidative activity and stability over seven months at room temperature, and importantly, chitosan widens the pH range for the stable existence of water-soluble nanoceria. As a result, including its inherent advantages of wide availability, non-toxicity, biocompatibility and biodegradability, chitosan can also present the nanoceria with good water-solubility without interfering with its antioxidative activity. In other words, chitosan can enlarge the nanoceria stability over a higher pH range. These factors show the advantages of chitosan as a coating layer, promising the further application of nanoceria in biomedical and biotechnological fields.
    RSC Advances 04/2013; 3(19):6833-6838. · 3.71 Impact Factor
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    ABSTRACT: Here, we investigated the interactions between nanorods (NRs) of Ce(OH)3 and CeO2 and the redox protein hemoglobin (Hb) by electrochemical methods combined with Electron Paramagnetic Resonance (EPR) spectroscopy. It was found that Ce(OH)3 NRs, with strong electron-donating ability, were able to conjugate with the aromatic residues in Hb, and were more efficient in the preferred stabilization of Feα.
    RSC Advances 04/2013; 3(18):6339-6342. · 3.71 Impact Factor
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    ABSTRACT: Cerium oxide (CeO(2)) nanoparticles display excellent antioxidant properties by scavenging free radicals. However, some studies have indicated that they can cause an adverse response by generating reactive oxygen species (ROS). Hence, it is important to clarify the factors that affect the oxidant/antioxidant activities of CeO(2) nanoparticles. In this work, we report the effects of different buffer anions on the antioxidant activity of CeO(2) nanoparticles. Considering the main anions present in the body, Tris-HCl, sulfate, and phosphate buffer solutions have been used to evaluate the antioxidant activity of CeO(2) nanoparticles by studying their DNA protective effect. The results show that CeO(2) nanoparticles can protect DNA from damage in Tris-HCl and sulfate systems, but not in phosphate buffer solution (PBS) systems. The mechanism of action has been explored: cerium phosphate is formed on the surface of the nanoparticles, which interferes with the redox cycling between Ce(3+) and Ce(4+). As a result, the antioxidant activity of CeO(2) nanoparticles is greatly affected by the external environment, especially the anions. These results may provide guidance for the further practical application of CeO(2) nanoparticles.
    Chemistry - A European Journal 07/2012; 18(35):11115-22. · 5.93 Impact Factor
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    ABSTRACT: It is still a challenge to develop green, simple and effective approaches to prepare aromatic iodides. Herein, a novel and green strategy for the direct mono‐iodination of aromatic compounds starting with molecular iodine has been developed. The strategy uses ceria nanocrystals to decompose hydrogen peroxide, giving hydroxyl radicals which are demonstrated experimentally and computationally to be crucial to promote the iodinations.
    Advanced Synthesis & Catalysis 03/2012; 354(4). · 5.54 Impact Factor
  • Kebin Zhou, Yadong Li
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    ABSTRACT: Mithilfe von Bottom-Up-Verfahren können die Zusammensetzung, Größe und Form jedes beliebigen Nanokristalls gleichmäßig gesteuert werden. Die Erforschung formkontrollierter Nanokristalle hat gezeigt, dass die katalytischen Eigenschaften dieser Materialien wegen ihrer wohldefinierten Kristallflächen nicht nur von der Größe, sondern auch von der Form der Nanokristalle bestimmt werden. Diese Erkenntnis ist für die moderne Heterogenkatalyseforschung von großer Bedeutung: Erstens könnte damit eine rationale Synthese von Katalysatoren ermöglicht werden, da sich die gewünschte katalytische Aktivität und Selektivität mithilfe einer einfachen Regulierung der Größe (d. h. der exponierten Kristallflächen) des Nanokristalls einstellen lassen. Zweitens sind formkontrollierte Nanokristalle einfachere Systeme als herkömmliche, komplexe Festkörper und könnten daher als neuartige Modellkatalysatoren die Lücke zwischen Modelloberflächen und realen Katalysatoren schließen.
    Angewandte Chemie 01/2012; 124(3).
  • Kebin Zhou, Yadong Li
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    ABSTRACT: Using bottom-up chemistry techniques, the composition, size, and shape in particular can now be controlled uniformly for each and every nanocrystal (NC). Research into shape-controlled NCs have shown that the catalytic properties of a material are sensitive not only to the size but also to the shape of the NCs as a consequence of well-defined facets. These findings are of great importance for modern heterogeneous catalysis research. First, a rational synthesis of catalysts might be achieved, since desired activity and selectivity would be acquired by simply tuning the shape, that is, the exposed crystal facets, of a NC catalyst. Second, shape-controlled NCs are relatively simple systems, in contrast to traditional complex solids, suggesting that they may serve as novel model catalysts to bridge the gap between model surfaces and real catalysts.
    Angewandte Chemie International Edition 12/2011; 51(3):602-13. · 11.34 Impact Factor
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    ABSTRACT: Multifunctional amphiphilic hollow carbonaceous spheres assembled into Pickering emulsions exhibit reversible pH-dependent phase-transfer behavior and can efficiently catalyze water/oil biphasic reactions, facilitating the recycling of the catalysts and separation of the products.
    Chemical Communications 11/2011; 47(43):11903-5. · 6.38 Impact Factor
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    ABSTRACT: Cerium oxide (CeO2) nanoparticles have been considered as excellent antioxidants and have become a focus of numerous studies. However, the mechanism behind the antioxidant role in the complex biological system has not been well-understood. In this work, direct evidence for the hydroxyl radical (•OH) scavenging activity of CeO2 nanoparticles was established by a simple photometric system in vitro. When methyl violet (MV) reacted with hydroxyl radical, the absorbance change indicated the hydroxyl radical level. The presence of CeO2 nanoparticles protected MV by competitively reacting with the •OH, so their hydroxyl radical scavenging activity was directly seen through the absorbance change. This activity was also proved to be size-dependent and was believed to have a close correlation with Ce3+ at the surface of the particles.
    02/2011;
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    ABSTRACT: Gold nanoparticles (Au-NPs) are usually used to amplify surface plasmon resonance (SPR) signals, however, the serious nonspecific adsorption has largely limited their practical applications. Here, we developed a novel Au-NPs enhanced biosensor without the effect of nonspecific adsorption: cutting Au-NPs off from the biosensor surface by RsaI endonuclease. In order to further improve the sensitivity, the probe DNA was designed specially. After the cleavage reaction, the residual probe DNA formed hairpin structure, which also resulted in a great change in SPR dip shift. Then, with the coaction of Au-NPs and conformation change of probe DNA, the SPR signal was amplified greatly. Using this method, we monitored the process of DNA cleavage in real-time and achieved a detection level of 5×10(-8) M. Moreover, the result of X-ray photoelectron spectroscopy (XPS) experiment further confirmed that large nonspecific adsorption existed. However, because SPR recorded a process in which the Au-NPs were cut off, the serious nonspecific adsorption did not affect the experimental result.
    Biosensors & Bioelectronics 01/2011; 26(5):2473-7. · 6.45 Impact Factor
  • Angewandte Chemie International Edition 06/2010; 49(25):4223-7. · 11.34 Impact Factor
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    ABSTRACT: Oxygen vacancy plays a critical role in most enhanced performances of ceria-based materials. In this study, a facile hydrothermal method was developed for the synthesis of one-dimensional rare-earth doped ceria: Ce1−xYxO2−x/2 (0≤x ≤ 1). The doping concentration could be as high as 90% and the oxygen vacancies therein could be tuned in a wide range. The role of oxygen vacancies on the catalytic properties of these one-dimentional solid solutions had been systematically investigated. It was found that the amounts of the dopant (Y3+) determined the concentration, type, and distribution of oxygen vacancies, which in turn influenced the reducibility and catalytic activity of the solid solutions: in the lightly doped ceria (x ≤ 0.1), oxygen vacancies formed associates with doped ions and improved the reducibility and catalytic activity of materials; with the dopants increased (0.1≤x ≤ 0.5), microdomains or C-type superstructures generated through the ordering of oxygen vacancies formed and decreased the catalytic activity of the solid solutions gradually; while in the heavily doped ceria, the reactivity of the solid solutions was drastically promoted; then, as the crystal transformed into the C-type structure (x ≥ 0.9), the solid solutions suffered poor reactivity again. The present finding deepens the understanding of the nature of oxygen vacancies and may furtherly guide the design of highly reactive metal oxide catalytic materials.
    The Journal of Physical Chemistry C. 04/2010; 114(19).
  • Chemistry Letters - CHEM LETT. 01/2010; 39(5):451-453.
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    ABSTRACT: CeO(2) is a catalytic material of exceptional technological importance, and the precise role of oxygen vacancies is crucial to the greater understanding of these oxide materials. In this work, two ceria nanorod samples with different types and distributions of oxygen vacancies were synthesized. A direct relationship between the concentration of the larger size oxygen vacancy clusters and the reducibility/reactivity of nanosized ceria was revealed. These results may be an important step in understanding and designing active sites at the surface of metal oxide catalytic materials.
    Journal of the American Chemical Society 03/2009; 131(9):3140-1. · 10.68 Impact Factor
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    ABSTRACT: A new horseradish peroxidase (HRP) third-generation electrochemical biosensor based on ceria nanocubes (CeO(2)-NCs) and chitosan (Chit) was developed. The single-crystalline, uniform and size-controlled CeO(2)-NCs have been synthesized by hydrothermal method. HRP was immobilized in CeO(2)-NCs and Chit film on the glass carbon electrode (HRP/CeO(2)/Chit/GCE). Compared with HRP-chitosan modified electrode (HRP/Chit/GCE), HRP/CeO(2)/Chit/GCE exhibited a pair of more obvious redox peaks at -0.348 V (versus Ag/AgCl). Experimental results indicate CeO(2)-NCs greatly promoted the electron transfer between HRP and GCE. The immobilized HRP exhibited direct electrochemical behavior toward the reduction of hydrogen peroxide (H(2)O(2)). The resulting biosensor showed a linear range of 1-150 microM and a detection limit of 0.26 microM estimated at a signal-to-noise ratio of 3. Stability and reproducibility of the biosensor were also studied. The biological activity of HRP immobilizing in the composite film was characterized by UV-vis and FTIR spectra.
    Biosensors & Bioelectronics 01/2009; 24(8):2447-51. · 6.45 Impact Factor
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    ABSTRACT: The size of the gold particles is a very important parameter to get active catalysts. This paper reports a novel colloidal deposition method to prepare Au/LaVO4 nanocomposite catalyst with monodispersed Au colloids and uniform LaVO4 nanoplates in nonpolar solvent. Monodispersed Au colloids with tunable size (such as 2, 5, 7, 11, 13, and 16 nm) and LaVO4 nanocrystals with well-defi ned shapes were pre-synthesized assisted with oleic acid/amine. During the following immobilization process, the particle size and shape of Au and LaVO4 were nearly preserved. As-prepared Au/LaVO4 nanocomposite showed high catalytic activity for CO oxidation at room temperature. Since sizes of gold particles were well-defi ned before the immobilization process, size effect of gold particles was easy to be investigated and the results show that 5-nm Au/LaVO4 nanocomposite has the highest activity for CO oxidation. This synthetic method can be extended further for the preparation of other composite nanomaterials.
    Nano Research 06/2008; 1(1):46-55. · 7.39 Impact Factor
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    ABSTRACT: Single-crystalline CeO2 nanocubes were synthesized through a hydrothermal treatment. By varying reaction temperature and the NaOH concentration, the size control of CeO2 nanocubes has been achieved, which produces the nanocubes with a controllable edge length in the regime of 20–360 nm. HRTEM studies reveal that the CeO2 nanocubes expose their high energy {001} planes. Consequently, it is demonstrated that the CeO2 nanocubes exhibit excellent reducibility and high oxygen storage capacity, indicating they are potential novel catalytic materials.
    Nanotechnology 04/2007; 18(18):185606. · 3.84 Impact Factor
  • Source
    Kebin Zhou, Zhiqiang Yang, Sen Yang
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
    ChemInform 02/2007; 38(24).
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    ABSTRACT: CuO nanocrystals with different shapes, i.e. irregular nanoparticles, nanobelts and nanoplatelets, have been synthesized by controlling a few critical synthesis parameters to explore their catalytic properties. It was found that the rate of CO oxidation on the nanoplatelets is over six times higher than that on the nanoparticles and about three times higher than that on the nanobelts at 110 °C. Based on combined characterizations, such as BET, XRD, TEM, HRTEM and CO temperature-programmed reduction, the relationship between the catalytic reactivity and the shape as well as the predominantly exposed crystal planes of the CuO nanocrystals has been discussed.
    Nanotechnology 07/2006; 17(15):3939. · 3.84 Impact Factor

Publication Stats

327 Citations
127.71 Total Impact Points

Institutions

  • 2008–2013
    • Technical Institute of Physics and Chemistry
      Peping, Beijing, China
  • 2010
    • China Agricultural University
      • College of Resources and Environmental Sciences
      Beijing, Beijing Shi, China
  • 2004–2006
    • Tsinghua University
      • Department of Chemistry
      Beijing, Beijing Shi, China
  • 2002
    • Northeast Institute of Geography and Agroecology
      • Research Center for Eco-Environmental Sciences
      Peping, Beijing, China