Confined growth of CuO, NiO, and Co3O4 nanocrystals in mesoporous silica (MS) spheres

Zong, Jie; Zhu, Yihua; Yang, Xin; Li, Chunzhong

doi:10.1016/j.jallcom.2010.11.175

Cited by 19 publications

(7 citation statements)

References 40 publications

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“…It is widely agreed among investigators that the pore structure and the pore size distribution activated carbons are influenced by the starting materials and template. [23][24][25] And, the carbonization process also plays an important role on the final product and careful selection of carbonization parameters for prepares the required carbons. Among the classical parameters that can be affect its pore structure, one of which is the carbonization temperature seem to be those in which the micro-/meso-porosity of the as-prepared carbons.…”

Section: -4mentioning

confidence: 99%

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Meng¹,

Park

2012

Bulletin of the Korean Chemical Society

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Nanoporous carbons with a high specific surface area were prepared directly from thermoplastic acrylic resin as carbon precursor and MgO powder as template by carbonization over the temperature range, 500-1000 °C. The effect of the carbonization temperature on the pore structure and CO 2 adsorption capacity of the obtained porous carbon was examined. The textural properties and morphology of the porous carbon materials were analyzed by N 2 /−196 °C and CO 2 /0 °C adsorption/desorption isotherms, SEM and TEM. The CO 2 adsorption capacity of the prepared porous carbon was measured at 25 °C and 1 bar and 30 bar. The specific surface area increased from 237 to 1251 m 2 /g, and the total pore volumes increased from 0.242 to 0.763 cm 3 /g with increasing the carbonization temperature. The carbonization temperature acts mainly by generating large narrow micropores and mesopores with an average pore size dependent on the level of carbonization of the MgO-templated nanoporous carbons. The results showed that the MgO-templated nanoporous carbons at 900°C exhibited the best CO 2 adsorption value of 194 mg/g at 1 bar.

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Section: -4mentioning

confidence: 99%

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Meng¹,

Park

2012

Bulletin of the Korean Chemical Society

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“…This method can be also used to prepare NiO//M x O y composites using SiO 2 , TiO 2 , Al 2 O 3 , or Na 4.2 Ca 2.8 (Si 6 O 18 ) matrices. Although a few methods were proposed to prepare NiO/SiO 2 [ 4 , 21 , 22 ], NiO/TiO 2 [ 6 , 23 , 24 , 25 ], NiO/Al 2 O 3 [ 26 , 27 , 28 , 29 ] composites, none of them is as general and simple as the one described here. As for the Na 4.2 Ca 2.8 (Si 6 O 18 ) case, although this particular composition has not been reported, similar nickel oxide doped with silica matrices have been successfully synthesized via a sol–gel process [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

et al. 2020

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The medium effect of the optical and catalytic degradation of methylene blue was studied in the NiO/SiO2, NiO/TiO2, NiO/Al2O3, and NiO/Na4.2Ca2.8(Si6O18) composites, which were prepared by a solid-state method. The new composites were characterized by XRD (X-ray diffraction of powder), SEM/EDS, TEM, and HR-TEM. The size of the NiO nanoparticles obtained from the PSP-4-PVP (polyvinylpyrrolidone) precursors inside the different matrices follow the order of SiO2 > TiO2 > Al2O3. However, NiO nanoparticles obtained from the chitosan precursor does not present an effect on the particle size. It was found that the medium effect of the matrices (SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18)) on the photocatalytic methylene blue degradation, can be described as a specific interaction of the NiO material acting as a semiconductor with the MxOy materials through a possible p-n junction. The highest catalytic activity was found for the TiO2 and glass composites where a favorable p-n junction was formed. The isolating character of Al2O3 and SiO2 and their non-semiconductor behavior preclude this interaction to form a p-n junction, and thus a lower catalytic activity. NiO/SiO2 and NiO/Na4.2Ca2.8(Si6O18) showed a similar photocatalytic behavior. On the other hand, the effect of the matrix on the optical properties for the NiO/SiO2, NiO/TiO2, NiO/Al2O3, and NiO/Na4.2Ca2.8(Si6O18) composites can be described by the different dielectric constants of the SiO2, TiO2, Al2O3, Na4.2Ca2.8(Si6O18) matrices. The maxima absorption of the composites (λmax) exhibit a direct relationship with the dielectric constants, while their semiconductor bandgap (Eg) present an inverse relationship with the dielectric constants. A direct relationship between λmax and Eg was found from these correlations. The effect of the polymer precursor on the particle size can explain some deviations from this relationship, as the correlation between the particle size and absorption is well known. Finally, the NiO/Na4.2Ca2.8(Si6O18) composite was reported in this work for the first time.

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“…22,[30][31][32] Zong et al have reported the conned growth of metal oxide nanocrystals on mesoporous silica spheres which act as the core material. 33 Very less attention has been paid towards the use of metal oxide nanoparticles in biological applications. For example, Mu et al have reported the peroxidase-like activity for Co 3 O 4 nanoparticles and, recently, they have also studied the effect of crystal plane of Co 3 O 4 on the peroxidase-like activity.…”

Section: Introductionmentioning

confidence: 99%

A facile synthetic approach for SiO₂@Co₃O₄ core–shell nanorattles with enhanced peroxidase-like activity

Kandula

Jeevanandam

2015

RSC Adv.

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SiO2@Co3O4 coreshell nanorattles with different Co3O4 shell thickness have been successfully synthesized by the calcination of SiO2@-Co(OH)2 at 500 o C. The synthetic approach is facile, economical, and requires no surface modification. The synthesized materials were thoroughly characterized using powder Xray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), BrunauerEmmettTeller (BET) analysis, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), and diffuse reflectance spectroscopy (DRS). SEM analysis indicates hierarchical coreshell morphology for SiO2@Co3O4 and the TEM results indicate the coreshell nanorattle morphology. Diffuse reflectance spectroscopy studies indicate that the SiO2@Co3O4 coreshell nanorattles show two absorption bands in the range 420450 nm and 700750 nm related to ligand to metal charge transfer transitions (O 2 → Co 2+ and O 2 → Co 3+ ). The SiO2@Co3O4 coreshell nanorattles act as an artificial peroxidase enzyme mimic with enhanced intrinsic peroxidaselike activity compared to pure Co3O4 nanoparticles and horseradish peroxidase (HRP), a natural enzyme. The SiO2@Co3O4 coreshell nanorattles show higher kcat and kcat/Km values compared to pure Co3O4 and HRP indicating their applicability as artificial enzyme mimic in biomedicine and biosensing.

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Confined growth of CuO, NiO, and Co3O4 nanocrystals in mesoporous silica (MS) spheres

Cited by 19 publications

References 40 publications

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

A facile synthetic approach for SiO₂@Co₃O₄ core–shell nanorattles with enhanced peroxidase-like activity

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Confined growth of CuO, NiO, and Co3O4 nanocrystals in mesoporous silica (MS) spheres

Cited by 19 publications

References 40 publications

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Investigation of Narrow Pore Size Distribution on Carbon Dioxide Capture of Nanoporous Carbons

Incorporation of NiO into SiO2, TiO2, Al2O3, and Na4.2Ca2.8(Si6O18) Matrices: Medium Effect on the Optical Properties and Catalytic Degradation of Methylene Blue

A facile synthetic approach for SiO2@Co3O4 core–shell nanorattles with enhanced peroxidase-like activity

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A facile synthetic approach for SiO₂@Co₃O₄ core–shell nanorattles with enhanced peroxidase-like activity