Introducing visible-light sensitivity into photocatalytic CeO2 nanoparticles by hybrid particle preparation exploiting plasmonic properties of gold: enhanced photoelectrocatalysis exemplified for hydrogen peroxide sensing

Nanoscale ◽  
2021 ◽  
Author(s):  
Shuang Zhao ◽  
Marc Riedel ◽  
Javier Patarroyo ◽  
Neus Bastus ◽  
Victor Puntes ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Light Sensitivity ◽  
Ceo2 Nanoparticles ◽  
Au Nps ◽  
Hybrid Particle ◽  
Particle Preparation

Enhancement of the photocatalytic current of CeO2 NPs upon their linkage to plasmonic Au NPs.

Tuning the Photocatalytic Performance of Plasmonic Nanocomposites (ZnO/Aux) Driven in Visible Light

2019 ◽  
Vol 8 (1) ◽  
pp. 56-61
Author(s):  
Aneeya K. Samantara ◽  
Debasrita Dash ◽  
Dipti L. Bhuyan ◽  
Namita Dalai ◽  
Bijayalaxmi Jena
Keyword(s):  
Electron Transfer ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Transfer Rate ◽  
Photocatalytic Performance ◽  
Light Exposure ◽  
Au Nanoparticle ◽  
Electron Transfer Rate ◽  
Au Nps ◽  
Zno Nanostructure

: In this article, we explored the possibility of controlling the reactivity of ZnO nanostructures by modifying its surface with gold nanoparticles (Au NPs). By varying the concentration of Au with different wt% (x = 0.01, 0.05, 0.08, 1 and 2), we have synthesized a series of (ZnO/Aux) nanocomposites (NCs). A thorough investigation of the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface has been carried out. It was observed that ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity among all concentrations of Au on the ZnO surface, which degrades the dye concentration within 2 minutes of visible light exposure. It was further revealed that with an increase in the size of plasmonic nanoparticles beyond 0.08%, the accessible surface area of the Au nanoparticle decreases. The photon absorption capacity of Au nanoparticle decreases beyond 0.08% resulting in a decrease in electron transfer rate from Au to ZnO and a decrease of photocatalytic activity. Background: Due to the industrialization process, most of the toxic materials go into the water bodies, affecting the water and our ecological system. The conventional techniques to remove dyes are expensive and inefficient. Recently, heterogeneous semiconductor materials like TiO2 and ZnO have been regarded as potential candidates for the removal of dye from the water system. Objective: To investigate the photocatalytic performance of different wt% of Au NPs on ZnO nanosurface and the effect of the size of Au NPs for photocatalytic performance in the degradation process. Methods: A facile microwave method has been adopted for the synthesis of ZnO nanostructure followed by a reduction of gold salt in the presence of ZnO nanostructure to form the composite. Results: ZnO/Au0.08 nanocomposite showed the highest photocatalytic activity which degrades the dye concentration within 2 minutes of visible light exposure. The schematic mechanism of electron transfer rate was discussed. Conclusion: Raspberry shaped ZnO nanoparticles modified with different percentages of Au NPs showed good photocatalytic behavior in the degradation of dye molecules. The synergetic effect of unique morphology of ZnO and well anchored Au nanostructures plays a crucial role.

Reusable iron sulfide nanospheres towards promoted photocatalytic and electrocatalytic activities

2017 ◽  
Vol 41 (18) ◽  
pp. 10083-10095 ◽  
Author(s):  
Bibhutibhushan Show ◽  
Nillohit Mukherjee ◽  
Anup Mondal
Keyword(s):  
Hydrogen Peroxide ◽  
Visible Light ◽  
Iron Sulfide ◽  
Sensing Properties ◽  
Electrochemically Deposited

Electrochemically deposited FeS nanospheres were found to degrade efficiently a series of toxic pigments and phenol in the presence of visible light. The material also showed excellent hydrogen peroxide sensing properties.

Visible-light assisted methylene blue (MB) removal by novel TiO2/adsorbent nanocomposites

2010 ◽  
Vol 61 (11) ◽  
pp. 2863-2871 ◽  
Author(s):  
Wei Zhang ◽  
Linda Zou ◽  
Lianzhou Wang
Keyword(s):  
Methylene Blue ◽  
Visible Light ◽  
Cost Effective ◽  
Light Sensitivity ◽  
Wet Chemical Method ◽  
Adsorption Ability ◽  
Synergistic Interactions ◽  
Dissolved Organic Compounds ◽  
Wet Chemical ◽  
Chemical Procedure

In present work, visible light sensitive TiO2/adsorbent nanocomposites (TNC) were prepared via a facile wet chemical method. Three types of adsorbents including zeolites (F-9, HSZ-690 and HSZ-930), mesoporous silica (MPS-2.7 and 4) and activated carbon, were used as the porous substrates for nanocomposites. Visible light sensitivity was incorporated to TNCs by nitrogen doping of TiO2, which is obtained through the addition of a nitrogen precursor, triethylamine, within the same wet chemical procedure. The photocatalytic and adsorption ability of as-prepared TNC resultants were studied using solutions of methylene blue (MB) as a model pollutant. Synergistic interactions between adsorption and visible-light photocatalysis were observed, as under the assistance of visible-light irradiation all TNCs achieved higher MB removal rates than those by adsorption process alone. The better performance of the as-prepared N-doped TNC reveals its potential to be used for cost effective solar photocatalytic degradation of dissolved organic compounds.

Degradation of natural toxins by phthalocyanines–example of cyanobacterial toxin, microcystin

2010 ◽  
Vol 62 (2) ◽  
pp. 273-278 ◽  
Author(s):  
Daniel Jančula ◽  
Lucie Bláhová ◽  
Marie Karásková ◽  
Blahoslav Maršálek
Keyword(s):  
Reactive Oxygen Species ◽  
Hydrogen Peroxide ◽  
Visible Light ◽  
Singlet Oxygen ◽  
Oxygen Species ◽  
Cyanobacterial Toxin ◽  
Natural Toxins ◽  
Peptide Toxins ◽  
Near Future ◽  
Absorption Characteristics

Phthalocyanines (Pcs) are promising photosensitizers for use in various branches of science and industry. In the presence of visible light and diatomic oxygen, phthalocyanines can react to produce singlet oxygen, a member of reactive oxygen species able to damage different molecules and tissues. The aim of this study was to investigate the ability of phthalocyanines to degrade natural toxins in the presence of visible light. As the representative of hardly degradable toxins, a group of cyanobacterial peptide toxins—microcystin-LR—was chosen for this study. According to our results, phthalocyanines are able to degrade 61,5% of microcystins within a 48-hour incubation (38% of microcystins was degraded after 24 h and 24% after 12 h of incubation). Although other oxidants like hydrogen peroxide or ozone are able to degrade microcystins within several hours, we assume that by optimizing the spectrum emitted by light source and by changing the absorption characteristics of Pcs, microcystins degradation by phthalocyanines could be more effective in the near future.

scholarly journals Alpha Lead Oxide (α-PbO): A New 2D Material with Visible Light Sensitivity

Small ◽  
2018 ◽  
Vol 14 (12) ◽  
pp. 1703346 ◽  
Author(s):  
Prashant Kumar ◽  
Jing Liu ◽  
Pranay Ranjan ◽  
Yaowu Hu ◽  
Sharma SRKC Yamijala ◽  
...  
Keyword(s):  
Visible Light ◽  
Lead Oxide ◽  
Light Sensitivity ◽  
2D Material
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