Facile Synthesis of Co3O4 Nanoparticles and their Biomimetic Activity

Co3O4 nanoparticles with biomimetic activity have been synthesized using inorganic precursor by a simple liquid precipitation method without use of any organic and assisted agents. XRD and IR results showed that the as-prepared product was well-crystalline cubic Co3O4 phase with a lattice constant of a=8.079Å. The TEM image showed that the obtained Co3O4 product possesses a spherical and rectangular shape with a diameter ranging from 10 to 20nm. The Co3O4 nanoparticles catalyzed oxidation of typical peroxidase substrate (ABTS) and 1,3,5-trimethylbenzene (TMB) to give the same color changes as microperoxidase -11( MP-11), respectively. And the catalysis by Co3O4 nanoparticles shows typical Michaelis-Menten curves similar to that of MP-11. These results demonstrate that the Co3O4 nanoparticles possess a biomimetic catalysis activity similar to that found in natural enzyme. The kinetic parameters showed Co3O4 nanoparticles had efficient catalytic activity in comparison to MP-11.The easy preparation, good stability and special properties of Co3O4nanoparticles make them the promising enzyme mimics.

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Facile synthesis of snowflake-like ZnO nanostructures at low temperature and their super catalytic activity for the ozone decomposition

Materials Research Bulletin ◽

10.1016/j.materresbull.2012.11.095 ◽

2013 ◽

Vol 48 (4) ◽

pp. 1725-1727 ◽

Cited By ~ 12

Author(s):

ZhenZhen Xu ◽

Yue Ben ◽

ZhongLin Chen ◽

Fei Qi

Keyword(s):

Catalytic Activity ◽

Low Temperature ◽

Ozone Decomposition ◽

Zno Nanostructures ◽

Facile Synthesis

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Facile synthesis of cubical Co3O4 supported Au nanocomposites with high activity for the reduction of 4-nitrophenol to 4-aminophenol

RSC Advances ◽

10.1039/c6ra00183a ◽

2016 ◽

Vol 6 (39) ◽

pp. 32430-32433 ◽

Cited By ~ 21

Author(s):

Yuwen Yang ◽

Yongyun Mao ◽

Bin Wang ◽

Xianwei Meng ◽

Jiao Han ◽

...

Keyword(s):

Catalytic Activity ◽

High Activity ◽

Impregnation Method ◽

Facile Synthesis ◽

Turn Over Frequency ◽

Turn Over

A facile impregnation method has been successfully applied for synthesis of a cubical Co3O4 supported Au nanocomposites, which leads to the excellent catalytic activity for the reduction of 4-nitrophenol with a high turn over frequency of 9.83 min−1.

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Catalyzed Oxidation of Cyclohexane over Co-Bi2(MoO4)3 Catalysts

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.354 ◽

2012 ◽

Vol 550-553 ◽

pp. 354-357

Author(s):

Su Ling Gao ◽

Tai Xuan Jia ◽

Zi Li Liu

Keyword(s):

Experimental Data ◽

Liquid Phase ◽

Selective Oxidation ◽

Atomic Ratio ◽

Precipitation Method ◽

Micro Structure ◽

Cooperative Effects ◽

Catalyzed Oxidation

The effect of catalyst on the performance of liquid-phase selective oxidation of cyclohexane as probe reaction over Co-Bi2(MoO4)3 prepared by precipitation method was investigated. The catalyst evaluation results show that the optimum catalyst atomic ratio is n(Mo):n(Bi):n(Co)=1.5:1:0.2 with high selecivity under certain conversion. Meanwhile selective oxidation of Bi2(MoO4)3 was slowed down, selecivity of cyclohexanone and cyclohexanol reached 74.1%, 22.2% respectively.The main composition of the catalyst is Bi2(MoO4)3. Co-Bi2(MoO4)3 had new catalyst sites with Bi3+, Mo6+ and Co2+ having a cooperative effects during oxidation of cyclohexane. Under this condition, selecivity of cyclohexanone improved greatly. Micro-structure and essence disciplinarian of Co-Bi2(MoO4)3 were disclosed by XRD and FTIR. This study could provide experimental data for the technical reform of industry equipment.

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Scheelite (CaWO4)-type microphosphors: Facile synthesis, structural characterization and photoluminescence properties

Modern Physics Letters B ◽

10.1142/s0217984916504005 ◽

2016 ◽

Vol 30 (32n33) ◽

pp. 1650400 ◽

Cited By ~ 1

Author(s):

Yuanyuan Han ◽

Dan Wang ◽

Danyang Liang ◽

Shiqi Wang ◽

Guoxin Lu ◽

...

Keyword(s):

Luminescence Decay ◽

Precipitation Method ◽

Ammonium Bromide ◽

Photoluminescence Properties ◽

Facile Synthesis ◽

Cetyltrimethyl Ammonium Bromide ◽

Broad Emission ◽

Transition Formula ◽

Cetyltrimethyl Ammonium ◽

Uv Excitation

Scheelite (CaWO4)-type microphosphors were synthesized by the precipitation method assisted with cetyltrimethyl ammonium bromide (CTAB). All compounds crystallized in the tetragonal structure with space group [Formula: see text] (No. 88). FE-SEM micrographs illustrate the spherical-like morphologies and rough surface. PL spectra indicate the broad emission peak maximum at 613 nm under UV excitation. Luminescence decay curves monitored by [Formula: see text] transition ([Formula: see text] nm) of Eu[Formula: see text] in doped CaWO4 are presented, the curves exhibit a single-exponential feature and the lifetime for doped CaWO4 is 0.61 ms.

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Facile synthesis of magnetic La–Zr composite as high effective adsorbent for fluoride removal

RSC Advances ◽

10.1039/c5ra27929a ◽

2016 ◽

Vol 6 (42) ◽

pp. 35859-35867 ◽

Cited By ~ 20

Author(s):

Pinghua Chen ◽

Weibo Zhang ◽

Menglin Li ◽

Peng Ai ◽

Lei Tian ◽

...

Keyword(s):

Precipitation Method ◽

Fluoride Removal ◽

Magnetic Composite ◽

Facile Synthesis ◽

Batch Studies ◽

Co Precipitation

A novel magnetic composite of La–Zr was prepared by co-precipitation method, and its fluoride removal ability was investigated in batch studies.

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Facile synthesis of novel Co3O4-Bi2O3 catalysts and their catalytic activity on bisphenol A by peroxymonosulfate activation

Chemical Engineering Journal ◽

10.1016/j.cej.2017.05.168 ◽

2017 ◽

Vol 326 ◽

pp. 1095-1104 ◽

Cited By ~ 66

Author(s):

Limin Hu ◽

Guangshan Zhang ◽

Qiao Wang ◽

Yanlong Sun ◽

Meng Liu ◽

...

Keyword(s):

Catalytic Activity ◽

Bisphenol A ◽

Facile Synthesis

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Facile synthesis of multi-shelled MnO2-Co3O4 hollow spheres with superior catalytic activity for CO oxidation

Ceramics International ◽

10.1016/j.ceramint.2021.03.164 ◽

2021 ◽

Author(s):

Jian Zhang Fubiao Gu ◽

Chang-An Wang

Keyword(s):

Catalytic Activity ◽

Co Oxidation ◽

Hollow Spheres ◽

Facile Synthesis

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Fabrication of Dy2O3 Transparent Ceramics by Vacuum Sintering Using Precipitated Powders

Magnetochemistry ◽

10.3390/magnetochemistry7010006 ◽

2020 ◽

Vol 7 (1) ◽

pp. 6

Author(s):

Dianjun Hu ◽

Xin Liu ◽

Ziyu Liu ◽

Xiaoying Li ◽

Feng Tian ◽

...

Keyword(s):

Near Infrared ◽

Optical Quality ◽

Precipitation Method ◽

Infrared Range ◽

Transparent Ceramics ◽

Vacuum Sintering ◽

Hydrogen Carbonate ◽

Ammonium Hydrogen ◽

Liquid Precipitation ◽

Near Infrared Range

As a kind of promising material for a Faraday isolator used in the visible and near infrared range, Dy2O3 transparent ceramics were prepared by vacuum sintering from the nano-powders synthesized by the liquid precipitation method using ammonium hydrogen carbonate as precipitant with no sintering aids. The synthesized precursor was calcinated at 950 °C–1150 °C for 4 h in air. The influences of the calcination temperature on the morphologies and phase composition of Dy2O3 powders were characterized. It is found that the Dy2O3 powder calcinated at 1000 °C for 4 h is superior for the fabrication of Dy2O3 ceramics. The Dy2O3 transparent ceramic sample prepared by vacuum sintering at 1850 °C for 10 h, and subsequently with air annealing at 1400 °C for 10 h, from the 1000 °C-calcined Dy2O3 powders, presents the best optical quality. The values of in-line transmittance of the optimal ceramic specimen with the thickness of 1.0 mm are 75.3% at 2000 nm and 67.9% at 633 nm. The Verdet constant of Dy2O3 ceramics was measured to be −325.3 ± 1.9 rad/(T·m) at 633 nm, about 2.4 times larger than that of TGG (Tb3Ga5O12) single crystals.

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