Simple synthesis of Ag nanoparticles /Cu2O cube photocatalyst at room temperature: efficient electron transfer improves photocatalytic performance

In this paper, a new simple approach has been developed for the preparation of α- Fe 2 O 3 microspheres by a facile hydrothermal method using PVP as a surfactant. Uniform α- Fe 2 O 3 microspheres could be routinely synthesized through solvothermal approach by controlling the PVP/ FeCl 3⋅6 H 2 O ratio. The as-obtained α- Fe 2 O 3 microspheres exhibit high efficiency on the decolorization of RhB aqueous solution in the presence of H 2 O 2 at room temperature.

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

Current Catalysis ◽

10.2174/2211544708666190124114519 ◽

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.

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Room‐Temperature Bistability in a Ni–Fe Chain: Electron Transfer Controlled by Temperature, Pressure, Light, and Humidity

Angewandte Chemie ◽

10.1002/ange.202016890 ◽

2021 ◽

Author(s):

Mateusz Reczyński ◽

Dawid Pinkowicz ◽

Koji Nakabayashi ◽

Christian Näther ◽

Jan Stanek ◽

...

Keyword(s):

Electron Transfer ◽

Room Temperature

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In-situ construction of direct Z-scheme AgBr/α-Ag2WO4 heterojunction with promoted spatial charge migration and photocatalytic performance

New Journal of Chemistry ◽

10.1039/d0nj05965j ◽

2021 ◽

Author(s):

Xiao-Ya Zhai ◽

Yifan Zhao ◽

Guo-Ying Zhang ◽

Bing-Yu Wang ◽

Qi-Yun Mao

Keyword(s):

Anion Exchange ◽

Large Scale ◽

Room Temperature ◽

Photocatalytic Performance ◽

Charge Migration ◽

Time Saving ◽

Spatial Charge ◽

Construction Strategy ◽

Large Scale Synthesis

In the work, a direct Z-scheme AgBr/α-Ag2WO4 heterojunction was prepared by in-situ anion exchange at room temperature. The construction strategy is energy- and time-saving for large scale synthesis. The α-Ag2WO4...

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Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature

Nanoscale Research Letters ◽

10.1186/s11671-019-3213-6 ◽

2019 ◽

Vol 14 (1) ◽

Cited By ~ 6

Author(s):

Shiqiang Zhou ◽

Mingpeng Chen ◽

Qingjie Lu ◽

Yumin Zhang ◽

Jin Zhang ◽

...

Keyword(s):

Indoor Air ◽

Ag Nanoparticles ◽

Room Temperature ◽

Unsolved Problem ◽

Air Pollutant ◽

Ag Nps ◽

Performance Targets ◽

Fabrication Cost ◽

Low Concentrations ◽

Stringent Performance

AbstractFormaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In2O3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In2O3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In2O3 exhibits a sluggish response (Ra/Rg = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In2O3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In2O3 nanograin, greatly enhancing the selectivity and sensitivity.

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