Nanostructuring of a GNS-V2O5–TiO2 core–shell photocatalyst for water remediation applications under sun-light irradiation

RSC Advances ◽  
2015 ◽  
Vol 5 (24) ◽  
pp. 18633-18641 ◽  
Author(s):  
R. Ajay Rakkesh ◽  
D. Durgalakshmi ◽  
S. Balakumar
Keyword(s):  
Sol Gel ◽  
Hydrothermal Process ◽  
Light Irradiation ◽  
Water Remediation ◽  
Core Shell ◽  
New Class ◽  
Gel Technique ◽  
Facile Hydrothermal Process ◽  
Sun Light

The GNS-V2O5–TiO2 composite, as a new class of nanoarchitecture, has been successfully fabricated by a facile hydrothermal process followed by a sol–gel technique.

SYNTHESIS AND MICROSTRUCTURE OF A NOVEL TiO2 AEROGEL–TiO2 NANOWIRE COMPOSITE

NANO ◽  
2008 ◽  
Vol 03 (05) ◽  
pp. 373-379 ◽  
Author(s):  
YOSHIKAZU SUZUKI ◽  
MARIE-HÉLÈNE BERGER ◽  
DANIELA D'ELIA ◽  
PIERRE ILBIZIAN ◽  
CHRISTIAN BEAUGER ◽  
...  
Keyword(s):  
Surface Area ◽  
Network Structure ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Supercritical Drying ◽  
Large Surface Area ◽  
Tem Analysis ◽  
Tio2 Nanowire ◽  
Nanowire Network ◽  
Gel Technique

TiO 2 aerogel–10 mol% TiO 2 nanowire composite was prepared by a sol–gel technique with the addition of TiO 2 nanowires to TiO 2 sol, followed by supercritical drying in CO 2. TiO 2 nanowires (anatase with minor rutile phases) as dispersoid were prepared by a hydrothermal process followed by calcination in air at 600°C. The TiO 2 nanowires were dispersed in a 2-propanol/ H 2 O / HNO 3 solution, and the mixture was added drop by drop to a tetrabutyl orthotitanate [i.e. Ti (IV) n-butoxide] solution in 2-propanol. After gelation, the TiO 2 alcogel– TiO 2 nanowire composite was dried in supercritical CO 2 to obtain the final, TiO 2 aerogel– TiO 2 nanowire composite. TEM analysis revealed that a unique "nanowire network" structure was formed within the mesoporous aerogel matrix. The aerogel– TiO 2 nanowire composite had a relatively large surface area 427 m2/g, with mesopores ~ 16 nm in diameter and a pore of volume of 1.63 cm3/g.

scholarly journals CuO@TiO2 and NiO@TiO2 core-shell catalysts for hydrogen production from the photocatalytic reforming of glycerol aqueous solution

2020 ◽  
Vol 18 (6) ◽  
pp. 390-409
Author(s):  
S. P. Ramírez ◽  
J. A. Wang ◽  
M. A. Valenzuela ◽  
L. F. Chen ◽  
A. Dalai
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Hydrogen Production ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Light Irradiation ◽  
Solar Light ◽  
Core Shell ◽  
Tio2 Catalyst ◽  
Solar Light Irradiation

Hydrogen production from the photocatalytic reforming of glycerol aqueous solution was performed on the CuO@TiO2, NiO@TiO2, NiO@CuO, and CuO@NiO core-shell nanostructured catalysts under simulated solar light irradiation. These catalysts were prepared by the combination of a modified sol-gel and a precipitation-deposition method using hydroxypropyl cellulose as structural linker and they were characterized by powder X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (UV–Vis DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen physisorption isotherms techniques. The catalysts containing TiO2 as a shell and CuO as core showed much higher activity compared with those formulated with NiO@CuO, CuO@NiO, and bared CuO or NiO nanoparticles. The highest rate of hydrogen production obtained with the CuO@TiO2 catalyst was as high as 153.8 μmol·g−1h-1, which was 29.0, 24.8, 11.2 and 3.2 times greater than that obtained on CuO@NiO, NiO@CuO, TiO2 P25, and NiO@TiO2 catalyst, respectively. For the high active CuO@TiO2 catalyst, after activation of TiO2 with solar light irradiation, the conduction band electrons can be transferred to CuO core through the heterojunction in the core-shell interfaces which led to CuO gradually reduced to Cu2O, favoring the reduction of proton to release hydrogen.

Enhancement of the isopropanol gas sensing performance of SnO2/ZnO core/shell nanocomposites

2017 ◽  
Vol 5 (10) ◽  
pp. 2662-2668 ◽  
Author(s):  
Madhukar Poloju ◽  
Nagabandi Jayababu ◽  
E. Manikandan ◽  
M. V. Ramana Reddy
Keyword(s):  
Zno Nanoparticles ◽  
Gas Sensing ◽  
Sol Gel ◽  
Core Shell ◽  
Gel Technique ◽  
Sensing Performance

Pure SnO2, ZnO nanoparticles, and a SnO2/ZnO core/shell nanocomposite (NC) were prepared via a sol–gel technique.

The Study of nano-SiO2/Polyacrylate Core-Shell Hybrid Emulsions

2014 ◽  
Vol 881-883 ◽  
pp. 986-989
Author(s):  
Fa Qiu Hou ◽  
Ning Qing ◽  
Yong Jun Chen
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Glass Transition ◽  
Water Contact Angle ◽  
Sol Gel ◽  
Core Shell ◽  
Water Contact ◽  
Glass Transition Temperatures ◽  
Ft Ir ◽  
Gel Technique

nano-SiO2 modified core-shell polyacrylate composite emulsion was synthesized by seeded semi-continuous starved pre-emulsion polymerization and sol-gel technique. The influence of 3-methacryloxypropyltrimethoxysilane(KH-570), tetraethoxysilane(TEOS) on the properties of emulsion and film were studied. The SiO2/silicone polyacrylate composite latex and the resultant films were characterized by fourier transform infrared spectroscopy(FT-IR), differential scanning calorimeter(DSC), thermogravimetric analysis(TGA), water contact angle goniometer (WCAG). The results showed that organic silicon and nano-SiO2 were effectively grafted to the polyacrylate molecular chain. We can observed there are two glass transition temperatures (Tg) in the DSC curve. The water contact angle (WCA) on the PAE film and SSPAE film separately attained 62.5°and 85.5°.

scholarly journals Preparation and Characterization of Nickel Ferrite-SiO2/Ag Core/Shell Nanocomposites

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
I. G. Blanco-Esqueda ◽  
G. Ortega-Zarzosa ◽  
J. R. Martínez ◽  
A. L. Guerrero
Keyword(s):  
Silver Nanoparticles ◽  
Nickel Ferrite ◽  
Sol Gel ◽  
Ferrite Nanoparticles ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Magnetic Composites ◽  
Nickel Ferrite Nanoparticles ◽  
Gel Technique

Magnetic composites with silver nanoparticles bonded to their surface were successfully prepared using a simple chemical method. By means of a sol-gel technique, nickel ferrite nanoparticles have been prepared and coated with silica to control and avoid their magnetic agglomeration. The structural and magnetic properties of the nanoparticles were studied in function of the annealing temperature. Then, silver nanoparticles were incorporated by hydrolysis-condensation of tetraethyl orthosilicate, which contains silver nitrate on the surface of the nickel ferrite-SiO2core/shell. Samples were characterized using X-ray diffraction, IR spectroscopy, SEM, and magnetometry. Results show that the silica covered the nickel ferrite nanoparticles and the silver nanoparticles remain stable in the surface of the composite.

Preparation and optical properties of TiO2−x N x /Ni0.5Zn0.5Fe2O4 core–shell nanocatalyst from sol–gel-hydrothermal process

2010 ◽  
Vol 54 (3) ◽  
pp. 340-346 ◽  
Author(s):  
Xiang Shen ◽  
Yan Xin Wang ◽  
Li Qiang Lu ◽  
Yan Ling Chen ◽  
Yong Xia ◽  
...  
Keyword(s):  
Optical Properties ◽  
Sol Gel ◽  
Hydrothermal Process ◽  
Core Shell

Highly Photoactive Monodidisperse Titania Hollow Nanospheres

2008 ◽  
Vol 11 (2) ◽  
Author(s):  
Athina Kyrkou ◽  
Athanassios I. Kontos ◽  
Georgios Papavassiliou ◽  
Polycarpos Falaras
Keyword(s):  
Thermal Treatment ◽  
Sol Gel ◽  
Core Shell ◽  
Titanium Alkoxide ◽  
Hollow Nanospheres ◽  
Modified Polymer ◽  
Gel Technique

Titania nanospheres were prepared using the sol-gel technique following a core-shell approach based on polystyrene substrates. Thermal treatment of the titanium alkoxide modified polymer core structures resulted to formation of monodisperse TiO

Synthesis and Characterization of Silylated Kaolinite/Silica Core–Shell Nanoparticles

2011 ◽  
Vol 105-107 ◽  
pp. 1760-1763
Author(s):  
Qian Zhang ◽  
Bai Mei Zhang
Keyword(s):  
Sol Gel ◽  
Core Shell ◽  
Silane Treatment ◽  
Shell Nanoparticles ◽  
Ultrafine Silica ◽  
Gel Technique ◽  
Silica Core ◽  
Kaolinite Surface ◽  
Core Shell Nanoparticles

Studies were conducted on the production of silane modified kaolinite/silica core-shell nanoparticles (SMKS). The SMKS nanoparticles were prepared via the sol–gel technique using tetraethyl oxysilane (TEOS) as the precursor to form silica shells on the surface of kaolinite particles followed with silane treatment. TEM of the unmodified kaolin (ORK) and SMKS revealed that a layer of ultrafine silica particles were deposited on the kaolinite surface to form a new kind of core–shell structure particles.

Preparation of Er3+:YAlO3/ZnO coating compound by sol-gel method and photocatalytic degradation of organic dyes under sun light irradiation

2010 ◽  
Vol 46 (4) ◽  
pp. 399-404 ◽  
Author(s):  
Jun Wang ◽  
Jia Li ◽  
Yingpeng Xie ◽  
Liqun Zhang ◽  
Guangxi Han ◽  
...  
Keyword(s):  
Photocatalytic Degradation ◽  
Organic Dyes ◽  
Sol Gel ◽  
Light Irradiation ◽  
Gel Method ◽  
Sol Gel Method ◽  
Sun Light

Mechanism analysis of the capacitance contributions and ultralong cycling-stability of the isomorphous MnO2@MnO2 core/shell nanostructures for supercapacitors

2015 ◽  
Vol 3 (11) ◽  
pp. 6168-6176 ◽  
Author(s):  
Jiajia Shao ◽  
Xiying Zhou ◽  
Qian Liu ◽  
Rujia Zou ◽  
Wenyao Li ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Capacitance ◽  
Hydrothermal Process ◽  
High Specific Capacitance ◽  
Cycling Stability ◽  
Core Shell ◽  
Mechanism Analysis ◽  
Shell Nanostructures ◽  
Excellent Cycling Stability ◽  
Facile Hydrothermal Process

The isomorphous MnO2@MnO2 core/shell nanostructures synthesized through a facile hydrothermal process showed remarkable electrochemical performance, i.e., a high specific capacitance with excellent cycling stability.

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