Effective charge separation and enhanced photocatalytic activity by the heterointerface in MoS2/reduced graphene oxide composites

RSC Advances ◽  
2016 ◽  
Vol 6 (65) ◽  
pp. 60318-60326 ◽  
Author(s):  
Long Zhang ◽  
Lan Sun ◽  
Shuai Liu ◽  
Yuhong Huang ◽  
Kewei Xu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Charge Separation ◽  
Effective Charge ◽  
Electron Hole ◽  
Effective Separation ◽  
Reduced Graphene ◽  
Oxide Composites

The MoS2/rGO exhibits enhanced photocatalytic activity for degradation of RhB due to effective separation of photo-generated electron–hole pairs by heterointerface.

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.

Synthesis of TiO2-Reduced Graphene Oxide Nanocomposites Offering Highly Enhanced Photocatalytic Activity

2019 ◽  
Vol 19 (11) ◽  
pp. 7089-7096 ◽  
Author(s):  
Wufa Li ◽  
Xiaohong Yang ◽  
Haitao Fu ◽  
Xizhong An ◽  
Haiyang Zhao
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Environmental Remediation ◽  
Hydrothermal Reaction ◽  
Photogenerated Electron ◽  
Electron Hole ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
Hole Recombination

Photogenerated electron–hole recombination significantly restricts the catalytic efficiency of titanium dioxide (TiO2). Various approaches have been developed to overcome this problem, yet it remains challenging. Recently, graphene modification of TiO2 has been considered as an effective alternative to prevent electron–hole recombination and consequently enhance the photocatalytic performance of TiO2. This study reports an efficient but simple hydrothermal method utilizing titanium (IV) butoxide (TBT) and graphene oxide (GO) to prepare TiO2-reduced graphene oxide (RGO) nanocomposites under mild reaction conditions. This method possesses several advantageous features, including no requirement of high temperature for TiO2 crystallization and a one-step hydrothermal reaction for mild reduction of GO without a reducing agent, which consequently makes the production of TiO2-RGO nanocomposites possible in a green and an efficient synthetic route. Moreover, the as-synthesized nanocomposites were characterized by numerous advanced techniques (SEM, TEM, BET, XRD, XPS, and UV-vis spectroscopy). In particular, the photocatalytic activities of the synthesized TiO2-RGO nanocomposites were evaluated by degrading the organic molecules (methylene blue, MB), and it was found that the photocatalytic activity of TiO2-RGO nanocomposites is ~4.5 times higher compared to that of pure TiO2. These findings would be useful for designing reduced graphene oxide-metal oxide hybrids with desirable functionalities in various applications for energy storage devices and environmental remediation.

The preparation and photocatalytic activity of phosphotungstic acid-reduced graphene oxide composites

2017 ◽  
Vol 96 ◽  
pp. 178-185 ◽  
Author(s):  
Li-hong Xia ◽  
Li-jun Luo ◽  
Junhong Li ◽  
Ya Fan ◽  
Wei Tan ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Phosphotungstic Acid ◽  
Reduced Graphene ◽  
Oxide Composites

Self-assembly and enhanced visible-light-driven photocatalytic activity of reduced graphene oxide-Bi2WO6 photocatalysts

2017 ◽  
Vol 6 (6) ◽  
pp. 505-516 ◽  
Author(s):  
Hongguang Yu ◽  
Chenglin Chu ◽  
Paul K. Chu
Keyword(s):  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Self Assembly ◽  
Electron Transition ◽  
Blue Shift ◽  
Electron Hole ◽  
Reduced Graphene ◽  
Visible Light Driven ◽  
Electron Hole Pair

AbstractThe reduced graphene oxide-Bi2WO6 (rGO-BWO) photocatalysts with different RM values (mass ratio of GO and Bi2WO6) had been successfully synthesized via hydrothermal method in the presence of GO. When increasing the RM values from 0 to 2%, the evident red shift of the absorption edges of rGO-BWO samples occurred, and the photocatalytic activities for the degradation of Rhodamine-B were enhanced gradually. However, there was a significant blue shift in the absorbance band, and the morphology of the incomplete rGO-BWO microspheres led to the lower photocatalytic activity when RM is increased from 4 to 10%. The enhanced photocatalytic activity can be attributed to the smaller band gap, which means needing less energy for the electron transition, the morphology of the unbroken microsphere that provides more possible reaction sites for the photocatalytic reaction, the appropriate GO content that may effectively mitigate electron-hole pair recombination by the migration of photoinduced electrons.

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