Plant leaf extracts as photocatalytic activity tailoring agents for BiOCl towards environmental remediation

2018 ◽  
Vol 165 ◽  
pp. 357-366 ◽  
Author(s):  
Seema Garg ◽  
Mohit Yadav ◽  
Amrish Chandra ◽  
Soniya Gahlawat ◽  
Pravin P. Ingole ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Environmental Remediation ◽  
Leaf Extracts ◽  
Plant Leaf

scholarly journals SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation Under Extended Solar Irradiation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 589
Author(s):  
Sivagowri Shanmugaratnam ◽  
Balaranjan Selvaratnam ◽  
Aravind Baride ◽  
Ranjit Koodali ◽  
Punniamoorthy Ravirajan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Environmental Remediation ◽  
High Performance ◽  
Degradation Mechanism ◽  
Solar Irradiation ◽  
Earth Abundant ◽  
Improved Performance ◽  
Chalcogenide Materials

Earth–abundant transition metal chalcogenide materials are of great research interest for energy production and environmental remediation, as they exhibit better photocatalytic activity due to their suitable electronic and optical properties. This study focuses on the photocatalytic activity of flower-like SnS2 nanoparticles (composed of nanosheet subunits) embedded in TiO2 synthesized by a facile hydrothermal method. The materials were characterized using different techniques, and their photocatalytic activity was assessed for hydrogen evolution reaction and the degradation of methylene blue. Among the catalysts studied, 10 wt. % of SnS2 loaded TiO2 nanocomposite shows an optimum hydrogen evolution rate of 195.55 µmolg−1, whereas 15 wt. % loading of SnS2 on TiO2 exhibits better performance against the degradation of methylene blue (MB) with the rate constant of 4.415 × 10−4 s−1 under solar simulated irradiation. The improved performance of these materials can be attributed to the effective photo-induced charge transfer and reduced recombination, which make these nanocomposite materials promising candidates for the development of high-performance next-generation photocatalyst materials. Further, scavenging experiments were carried out to confirm the reactive oxygen species (ROS) involved in the photocatalytic degradation. It can be observed that there was a 78% reduction in the rate of degradation when IPA was used as the scavenger, whereas around 95% reduction was attained while N2 was used as the scavenger. Notably, very low degradation (<5%) was attained when the dye alone was directly under solar irradiation. These results further validate that the •OH radical and the superoxide radicals can be acknowledged for the degradation mechanism of MB, and the enhancement of degradation efficiency may be due to the combined effect of in situ dye sensitization during the catalysis and the impregnation of low bandgap materials on TiO2.

Tube-like α-Fe2O3@Ag/AgCl heterostructure: controllable synthesis and enhanced plasmonic photocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 61239-61248 ◽  
Author(s):  
Jun Liu ◽  
Wei Wu ◽  
Qingyong Tian ◽  
Shuanglei Yang ◽  
Lingling Sun ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Environmental Remediation ◽  
Controllable Synthesis

Plasmonic photocatalysts coupled with semiconductors are one of the most popular combinations in environmental remediation applications.

scholarly journals Effects of the preparation method on the structure and the visible-light photocatalytic activity of Ag2CrO4

2014 ◽  
Vol 5 ◽  
pp. 658-666 ◽  
Author(s):  
Difa Xu ◽  
Shaowen Cao ◽  
Jinfeng Zhang ◽  
Bei Cheng ◽  
Jiaguo Yu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Environmental Remediation ◽  
Preparation Method ◽  
Blue Shift ◽  
Preparation Methods ◽  
Visible Light Photocatalytic Activity ◽  
The Comparative Study ◽  
Hydrothermal Methods ◽  
Visible Light Photocatalytic

Silver chromate (Ag2CrO4) photocatalysts are prepared by microemulsion, precipitation, and hydrothermal methods, in order to investigate the effect of preparation methods on the structure and the visible-light photocatalytic activity. It is found that the photocatalytic activity of the prepared Ag2CrO4was highly dependent on the preparation methods. The sample prepared by microemulsion method exhibits the highest photocatalytic efficiency on the degradation of methylene blue (MB) under visible-light irradiation. The enhanced photocatalytic activity could be ascribed to the smaller particle size, higher surface area, relatively stronger light absorption, and blue-shift absorption edge, which result in the adsorption of more MB molecules, a shorter diffusion process of more photogenerated excitons, and a stronger oxidation ability of the photogenerated holes. Considering the universalities of microemulsion, precipitation, and hydrothermal methods, this work may also provide a prototype for the comparative study of semiconductor based photocatalysis for water purification and environmental remediation.

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