Synergetic effect of the ultrasonic-assisted hydrothermal process on the photocatalytic performance of MoS2 and WS2 nanoparticles

Author(s):  
Mani Govindasamy ◽  
Sea-Fue Wang ◽  
Asma A. Alothman ◽  
Razan A. Alshgari ◽  
P. S. Ganesh
2018 ◽  
Vol 5 (6) ◽  
pp. 172005 ◽  
Author(s):  
Chentao Hou ◽  
Wenli Liu

TiO 2 /TiOF 2 nanohybrids were quickly synthesized through a hydrothermal process using titanium n-butoxide (TBOT), ethanol (C 2 H 5 OH) and hydrofluoric acid as precursors. The prepared nanohybrids underwent additional NaOH treatment (OH-TiO 2 /TiOF 2 ) to enhance their photocatalytic performance. In this paper, the mechanism of NaOH affecting the pathway of transformation from TBOT (Ti precursor) to TiO 2 nanosheets was discussed. The synthesized TiO 2 /TiOF 2 and OH-TiO 2 /TiOF 2 were characterized by field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction pattern (XRD), Fourier infrared spectroscopic analysis (FT-IR), Photoluminescence (PL) emission spectra and UV–visible diffuse reflection spectra (UV–vis DRS). The photocatalytic activity and stability of synthesized samples were evaluated by degradation of methylene blue (MB) under the simulated solar light. The results showed that a larger ratio of TiO 2 to TiOF 2 in TiO 2 /TiOF 2 and OH-TiO 2 /TiOF 2 nanohybrids could allow for even higher MB conversion compared with only TiO 2 nanosheets. NaOH treatment can wash off the F ions from TiOF 2 and induce this larger ratio. The highest efficiency of MB removal was just above 90% in 1 h. Lower electron–hole pairs recombination rate is the dominant factor that induces the photocatalytic performance enhancement of TiO 2 /TiOF 2 nanohybrids. The synthesized OH-TiO 2 /TiOF 2 nanohybrids exhibit great potential in the abatement of organic pollutants.


2016 ◽  
Vol 49 (2) ◽  
pp. 191-196 ◽  
Author(s):  
Qingming Meng ◽  
Jian Wang ◽  
Zhen Ma ◽  
Baodong Zhu ◽  
Jianwei Zhang

Nanomaterials ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 1636 ◽  
Author(s):  
Zhou ◽  
Zhang ◽  
Wang ◽  
Wang ◽  
Xu ◽  
...  

P25 loaded few layered molybdenum disulfide (MoS2) nanosheets (P25@MoS2) are successfully synthesized through a facile one-step hydrothermal process. The bi-catalytic activities, i.e., photocatalytic and electrocatalytic activities, of the as-prepared nanomaterials have been investigated. For the as-prepared products, the photocatalytic performances were investigated by degrading simulated pollutant under sunlight irradiation, and the hydrogen evolution reaction evaluated the electrocatalytic performances. The results indicate that P25@MoS2 possesses excellent activities in both photocatalysis and electrocatalysis. The presence of MoS2 broadens the light absorption range of P25 and improves the separation and transformation efficiency of photogenerated carriers, thus improving its photocatalytic performance. The existence of P25 inhibits the aggregation of MoS2 to form more dispersed MoS2 nanosheets with only few layers increasing its active sites. Thereby, the electrocatalytic performance is heightened. The excellent multifunction makes the as-prepared P25@MoS2 a promising material in the fields of environment and energy.


2014 ◽  
Vol 953-954 ◽  
pp. 1147-1150
Author(s):  
Jing Li ◽  
Yan Zhong Zhen ◽  
Feng Fu ◽  
Dan Jun Wang ◽  
Xiao Ming Gao ◽  
...  

Uniform 1D MoO3nanobelts were synthesized via a facile template-free hydrothermal process using (NH4)6Mo24·4H2O as raw materials. XRD, FE-SEM, HR-TEM techniques were employed to investigate the phase composition, morphology, and microstructure of as-synthesized samples. The MoO3nanobelts have single crystalline orthorhombic phase structure, preferentially grow in [001] direction. The photocatalytic properties were evaluated by the photodegradation of Rhodamine-B under visible light irradiation. The experimental result illustrated that the compound exhibits good photocatalytic performance for degradation of RhB under visible light irradiation.


RSC Advances ◽  
2016 ◽  
Vol 6 (44) ◽  
pp. 37689-37700 ◽  
Author(s):  
Yajie Zhu ◽  
Pingxiao Wu ◽  
Shanshan Yang ◽  
Yonghong Lu ◽  
Wen Li ◽  
...  

Functionalized CNTs played a key role in facilitating the interfacial charge transfer, which accounted for the significantly enhanced photocatalytic performance.


RSC Advances ◽  
2017 ◽  
Vol 7 (31) ◽  
pp. 19019-19025 ◽  
Author(s):  
Huihua Gong ◽  
Yue Cao ◽  
Yifeng Zhang ◽  
Yu Zhang ◽  
Kewei Liu ◽  
...  

The controlled, selective deposition of Pt and PbOx dual-cocatalysts on the edged (200) and (020) facets and the main (002) facets of square-like WO3 nanoplates, respectively, resulted in a remarkable synergetic effect in the photocatalytic performance.


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