One-pot low-temperature synthesis of TiO2 nanowire/rGO composites with enhanced photocatalytic activity

RSC Advances ◽  
2016 ◽  
Vol 6 (96) ◽  
pp. 94092-94097 ◽  
Author(s):  
Huan Xing ◽  
Wei Wen ◽  
Jin-Ming Wu
Keyword(s):  
Photocatalytic Activity ◽  
Reaction Rate ◽  
Uv Light ◽  
Reaction Rate Constant ◽  
Light Illumination ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
One Pot ◽  
Tio2 Nanowire

In situ growth of TiO2 nanowires on graphene oxide was achieved at 80 °C in an open atmosphere. The optimized TiO2/rGO hybrid exhibited a reaction rate constant 5.5 times that of TiO2 nanowires towards photodegradations of rhodamine B in water under the UV light illumination.

scholarly journals Sheet-on-belt branched TiO2(B)/rGO powders with enhanced photocatalytic activity

2018 ◽  
Vol 9 ◽  
pp. 1550-1557 ◽  
Author(s):  
Huan Xing ◽  
Wei Wen ◽  
Jin-Ming Wu
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Charge Separation ◽  
Reaction Rate ◽  
Uv Light ◽  
Three Dimensional ◽  
Reaction Rate Constant ◽  
Light Illumination ◽  
Reduced Graphene

TiO2(B) is usually adopted to construct phase junctions with anatase TiO2 for applications in photocatalysis to facilitate charge separation; its intrinsic photocatalytic activity, especially when in the form of one- or three-dimensional nanostructures, has been rarely reported. In this study, a sheet-on-belt branched TiO2(B) powder was synthesized with the simultaneous incorporation of reduced graphene oxide (rGO). The monophase, hierarchically nanostructured TiO2(B) exhibited a reaction rate constant 1.7 times that of TiO2(B)/rGO and 2.9 times that of pristine TiO2(B) nanobelts when utilized to assist the photodegradation of phenol in water under UV light illumination. The enhanced photocatalytic activity can be attributed to the significantly increased surface area and enhanced charge separation.

One-pot low-temperature synthesis of a MnFe2O4–graphene composite for lithium ion battery applications

RSC Advances ◽  
2014 ◽  
Vol 4 (54) ◽  
pp. 28421-28425 ◽  
Author(s):  
Huang Tang ◽  
Peibo Gao ◽  
An Xing ◽  
Shuang Tian ◽  
Zhihao Bao
Keyword(s):  
Graphene Oxide ◽  
Low Temperature ◽  
Lithium Ion ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
One Pot ◽  
Graphene Composite ◽  
Reduced Graphene ◽  
Low Temperature Process

A MnFe2O4–reduced graphene oxide (rGO) nanocomposite was successfully synthesized by a one-pot low-temperature process by coprecipitation of Mn ions produced in the modified Hummer's method and in situ reduction of GO at 90 °C.

Probing the Dynamic Self-Assembly Behaviour of Photoswitchable Wormlike Micelles in Real Time

2018 ◽  
Author(s):  
Elaine A. Kelly ◽  
Judith E. Houston ◽  
Rachel Evans
Keyword(s):  
Real Time ◽  
Absorption Spectroscopy ◽  
Self Assembly ◽  
Uv Light ◽  
Wormlike Micelles ◽  
Tetraethylene Glycol ◽  
Light Illumination ◽  
First Time ◽  
Dependent Processes

Understanding the dynamic self-assembly behaviour of azobenzene photosurfactants (AzoPS) is crucial to advance their use in controlled release applications such as<i></i>drug delivery and micellar catalysis. Currently, their behaviour in the equilibrium <i>cis-</i>and <i>trans</i>-photostationary states is more widely understood than during the photoisomerisation process itself. Here, we investigate the time-dependent self-assembly of the different photoisomers of a model neutral AzoPS, <a>tetraethylene glycol mono(4′,4-octyloxy,octyl-azobenzene) </a>(C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>) using small-angle neutron scattering (SANS). We show that the incorporation of <i>in-situ</i>UV-Vis absorption spectroscopy with SANS allows the scattering profile, and hence micelle shape, to be correlated with the extent of photoisomerisation in real-time. It was observed that C<sub>8</sub>AzoOC<sub>8</sub>E<sub>4</sub>could switch between wormlike micelles (<i>trans</i>native state) and fractal aggregates (under UV light), with changes in the self-assembled structure arising concurrently with changes in the absorption spectrum. Wormlike micelles could be recovered within 60 seconds of blue light illumination. To the best of our knowledge, this is the first time the degree of AzoPS photoisomerisation has been tracked <i>in</i><i>-situ</i>through combined UV-Vis absorption spectroscopy-SANS measurements. This technique could be widely used to gain mechanistic and kinetic insights into light-dependent processes that are reliant on self-assembly.

scholarly journals Facile Low-Temperature Synthesis of Carbon Nanotube/ Nanohybrids with Enhanced Visible-Light-Driven Photocatalytic Activity

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Yunlong Xie ◽  
Huanhuan Qian ◽  
Yijun Zhong ◽  
Hangming Guo ◽  
Yong Hu
Keyword(s):  
Carbon Nanotubes ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Chemical Precipitation ◽  
Hybrid Structures ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Titanium Sulfate ◽  
Visible Light Driven ◽  
Degussa P25

We demonstrate a facile and novel chemical precipitation strategy for the accurate coating of TiO2nanoparticles on the surface of carbon nanotubes (CNTs) to form CNT/TiO2nanohybrids, which only requires titanium sulfate and CNTs as starting materials and reacts in the alkaline solution at 60°C for 6 h. Using this process, the as-prepared hybrid structures preserved the good dispersity and uniformity of initial CNTs. Furthermore, the CNT/TiO2nanohybrids show a broad blue luminescence at 469 nm and exhibit significantly enhanced photocatalytic activity for the degradation of rhodamine B (RhB) under visible-light irradiation, which is about 1.5 times greater than that of commercial Degussa P25 TiO2nanoparticles. It is believed that this facile chemical precipitation strategy is scalable and its application can be extended to synthesize other CNT/oxide nanohybrids for various applications.

One-Pot Low Temperature Synthesis of Monodisperse Silver Nanoparticles

2012 ◽  
Vol 12 (9) ◽  
pp. 7280-7283
Author(s):  
Renchun Yang ◽  
Dingxing Tang ◽  
Fengyun Ma ◽  
Ting Xian Tao ◽  
Yiming Ren ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Low Temperature ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
One Pot

scholarly journals Self-propagating High-temperature Synthesis of Materials Based on Tungsten Carbide for One-Pot Hydrolysis-Hydrogenolysis of Cellulose Into Ethylene Glycol and 1,2-Propylene Glycol

2019 ◽  
pp. 269-281
Author(s):  
Nikolay V. Gromov ◽  
Тatiana B. Medvedeva ◽  
Ivan А. Lukoyanov ◽  
Alekasandr А. Zhdanok ◽  
Vladimir А. Poluboyarov ◽  
...  
Keyword(s):  
High Temperature ◽  
Ethylene Glycol ◽  
Tungsten Carbide ◽  
Propylene Glycol ◽  
Reaction Rate ◽  
Total Yield ◽  
Temperature Synthesis ◽  
One Pot ◽  
Catalytic Systems ◽  
High Temperature Synthesis

Catalytic systems based on tungsten carbide (WnC) containing mainly W2C were obtained by the method of self-propagating high-temperature synthesis from a mechanochemically activated mixture of tungsten oxide, metallic magnesium, carbon black and CaCO3. The phase composition of the formed materials was shown to depend on the amount of CaCO3. The catalytic properties of the materials were tested in the hydrolysis-hydrogenation of cellulose to ethylene glycol (EG) and 1,2-propylene glycol (PG). It was established that in the presence of WnC the main products of the reaction were EG and PG with a ratio of PG/EG – 1.5-1.8. The deposition of nickel nanoparticles on the WnC surface increased the reaction rate and product yields. The maximum total yield of diols was 47.1 mol. %.

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