Few-Layered MoS2 Nanoparticles Loaded TiO2 Nanosheets with Exposed {001} Facets for Enhanced Photocatalytic Activity

NANO ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. 1850129 ◽  
Author(s):  
Chujun Chen ◽  
Xia Xin ◽  
Jinniu Zhang ◽  
Gang Li ◽  
Yafeng Zhang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Visible Light ◽  
Recombination Rate ◽  
Active Species ◽  
Molar Ratio ◽  
Carrier Recombination ◽  
Tio2 Nanosheets ◽  
Photocatalytic Activities ◽  
Charge Carrier Recombination

To improve the high charge carrier recombination rate and low visible light absorption of {001} facets exposed TiO2 [TiO2(001)] nanosheets, few-layered MoS2 nanoparticles were loaded on the surfaces of TiO2(001) nanosheets by a simple photodeposition method. The photocatalytic activities towards Rhodamine B (RhB) were investigated. The results showed that the MoS2–TiO2(001) nanocomposites exhibited much enhanced photocatalytic activities compared with the pure TiO2(001) nanosheets. At an optimal Mo/Ti molar ratio of 25%, the MoS2–TiO2(001) nanocomposites displayed the highest photocatalytic activity, which took only 30[Formula: see text]min to degrade 50[Formula: see text]mL of RhB (50[Formula: see text]mg/L). The active species in the degradation reaction were determined to be h[Formula: see text] and [Formula: see text]OH according to the free radical trapping experiments. The reduced charge carrier recombination rate, enhanced visible light utilization and increased surface areas contributed to the enhanced photocatalytic performances of the 25% MoS2–TiO2(001) nanocomposites.

Impact of Loading of RuO2 Co-Catalyst on Photocatalytic Activity of PbTiO3 Nanorods for Hydrogen Production Under Visible Light

2019 ◽  
Vol 11 (11) ◽  
pp. 1540-1546
Author(s):  
Maha Alhaddad ◽  
Reda M. Mohamed
Keyword(s):  
Photocatalytic Activity ◽  
Charge Carrier ◽  
Visible Light ◽  
High Surface ◽  
Weight Percent ◽  
Light Illumination ◽  
Hydrothermal Route ◽  
Carrier Recombination ◽  
Production Of Hydrogen ◽  
Charge Carrier Recombination

The split of charge carriers is an essential point that raises the rate of hydrogen evolution in the reaction of water splitting. The avoidance of charge carrier recombination can be attained by deposition of co-catalysts onto the surface of semiconductor materials. In this work, PbTiO3 nanorods were prepared using hydrothermal route in the presence of polyvinylpyrrolidone as a surfactant. Finally, PbTiO3 nanorods were decorated by RuO2 nanoparticles and the weight percent of RuO2 changed from 0.5 to 2.0 wt%. PbTiO3 nanorods and RuO2–PbTiO3 nanocomposites were investigated for their production of hydrogen under visible light illumination in the presence of glycerol as a scavenger. The outcomes recorded that the photocatalytic activity of PbTiO3 nanorods was improved by RuO2 nanoparticles decoration. The content of RuO2 nanoparticles had an important effect on the photocatalytic activity of PbTiO3 nanorods. The best weight percent of decorated RuO2 was 1.5 wt%, which improved photocatalytic activity of PbTiO3 nanorods by about 6 times. Moreover, the photocatalytic activity of 1.5 wt% RuO2–PbTiO3 nanocomposites was almost stable for five times. The enlargement of photocatalytic activity of PbTiO3 nanorods by RuO2 decoration was due to high surface area, small bandgap and avoidance of charge carrier recombination.

scholarly journals Photocatalytic Improvement under Visible Light inTiO2Nanoparticles by Carbon Nanotube Incorporation

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Mathana Wongaree ◽  
Siriluk Chiarakorn ◽  
Surawut Chuangchote
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Sol Gel ◽  
Multiwall Carbon Nanotubes ◽  
High Specific Surface Area ◽  
Molar Ratio ◽  
Molar Ratios ◽  
Calcination Temperatures ◽  
Photocatalytic Activities ◽  
Multiwall Carbon

Photocatalytic activity ofTiO2nanoparticles was successfully enhanced by addition of multiwall carbon nanotubes (MWCNT) to make CNT/TiO2nanocomposites by sol-gel method at ambient temperature. CNT treated by HNO3 : H2SO4treatment (1 : 3 v/v) was mixed withTiO2nanoparticles at various molar ratios and calcination temperatures. The optimal molar ratio of CNT : TiO2was found at 0.05 : 1 by weight. The optimal calcination condition was 400°C for 3 h. From the results, the photocatalytic activities of CNT/TiO2nanocomposites were determined by the decolorization of 1 × 10−5 M methylene blue (MB) under visible light. CNT/TiO2nanocomposites could enhance the photocatalytic activity and showed faster for the degradation of MB with only 90 min. The degradation efficiency of the MB solution with CNT/TiO2nanocomposite achieved 70% which was higher than that with pristineTiO2(22%). This could be explained that CNT preventsTiO2from its agglomeration which could further enhance electron transfer in the composites. In addition, CNT/TiO2nanocomposites had high specific surface area (202 m2/g) which is very promising for utilization as a photocatalyst for environmental applications.

Controllable synthesis of a 3D ZnS@MoO3 heterojunction via a hydrothermal method towards efficient NO purification under visible light

CrystEngComm ◽  
2020 ◽  
Vol 22 (2) ◽  
pp. 257-266 ◽  
Author(s):  
Ziyang Guo ◽  
Wangchen Huo ◽  
Tong Cao ◽  
Fangzheng Fan ◽  
Guangxu Ge ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Visible Light ◽  
Hydrothermal Method ◽  
Light Absorption ◽  
Interface Reaction ◽  
Photocatalytic Efficiency ◽  
Controllable Synthesis ◽  
Carrier Recombination ◽  
Charge Carrier Recombination

Heterojunctions can deliver superior photocatalytic efficiency via modulating the surface-interface reaction, enhancing light absorption and hindering charge carrier recombination.

scholarly journals Synthesis of SiC/BiOCl Composites and Its Efficient Photocatalytic Activity

Catalysts ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 946
Author(s):  
Wanli Liu ◽  
Qi Li ◽  
Xianglong Yang ◽  
Xiufang Chen ◽  
Xiangang Xu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Active Species ◽  
Cottage Cheese ◽  
Photocatalytic Reaction ◽  
Mechanism Analysis ◽  
Efficient Separation ◽  
Photocatalytic Activities ◽  
Light Utilization ◽  
Trapping Agent

BiOCl nanosheets nucleated and grew on cottage cheese-like SiC substrate via hydrothermal procedure, through which a tight heterojunction was formed. SiC/BiOCl composites with varied morphologies were acquired that the formation of BiOCl was involved with different form of carbon existed on surface of SiC. The photocatalytic mechanism analysis revealed that the combination of SiC and BOC significantly enhanced photocatalytic activities owing to the improved visible light utilization, efficient separation of photo-generated carriers, and promoted reactive area. The main active species during the photocatalytic reaction was determined as ·O2− radical by additionally adding trapping agent into the reactant. The SiC-BOC composites showed much higher photoactivities in photocurrent responses and photocatalytic degradation of TC-HCl, which mainly attributed to the well-built heterointerface promoted by Bi-C bonds and the interlaced structure obtained by increasing exposure of (010) facets in BiOCl. The nucleation, growth and combination architecture of BiOCl was all influenced by the involvement of SiC.

scholarly journals Electrospun ZnO/Bi2O3Nanofibers with Enhanced Photocatalytic Activity

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Yingying Yang ◽  
Lingling Xu ◽  
Chunyan Su ◽  
Jixin Che ◽  
Wenjun Sun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Electron Hole ◽  
Effective Electron ◽  
Structure Morphology ◽  
Electrospinning Method ◽  
Photocatalytic Activities ◽  
The Relationship

ZnO/Bi2O3nanofibers were synthesized by a simple electrospinning method and both the UV and visible light responsive photocatalytic properties were studied by the decolorization of RhB dye. Thermogravimetric analysis/differential thermal analysis (TGA-DTA), X-ray diffraction (XRD), scanning electron microscope (SEM), and UV-vis diffuse reflectance spectra (DRS) were employed to study the structure, morphology, and optical properties of the ZnO/Bi2O3nanofibers, respectively. The relationship between the ZnO/Bi2O3ratio and photocatalytic activity was also studied, and the composite with a molar ratio of 23 : 1 demonstrated the best activity under both excitations. The photocatalytic mechanisms for the composite fibers can be described as the direct photocatalysis under UV excitation and photosensitation for visible light irradiation. The enhanced photocatalytic activities can be ascribed to the effective electron-hole pairs separation that leads to the promoted photocatalytic efficiency.

Efficient Defect Passivation with Niacin for High-Performance and Stable Perovskite Solar Cells

2021 ◽  
Author(s):  
Jing Ren ◽  
Shurong Wang ◽  
Jianxing Xia ◽  
Chengbo Li ◽  
Lisha Xie ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
High Performance ◽  
Perovskite Solar Cells ◽  
Trap States ◽  
Carrier Recombination ◽  
Defect Passivation ◽  
Recombination Centers ◽  
Charge Carrier Recombination ◽  
Halide Perovskite

Defects, inevitably produced in the solution-processed halide perovskite films, can act as charge carrier recombination centers to induce severe energy loss in perovskite solar cells (PSCs). Suppressing these trap states...

Time-dependent Langevin-type bimolecular charge carrier recombination in regiorandom poly(3-hexylthiophene)

2005 ◽  
Vol 155 (2) ◽  
pp. 242-245 ◽  
Author(s):  
A. Pivrikas ◽  
R. Österbacka ◽  
G. Juška ◽  
K. Arlauskas ◽  
H. Stubb
Keyword(s):  
Charge Carrier ◽  
Time Dependent ◽  
Carrier Recombination ◽  
Charge Carrier Recombination
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