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Preparation of Silver-Palladium Alloyed Nanoparticles for Plasmonic Catalysis under Visible-Light Illumination
Published on: August 18, 2020
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Silver-modified octahedral anatase particles as plasmonic photocatalyst
Z Wei1, M Janczarek1,2, M Endo1
1Institute for Catalysis. Hokkaido University, N21, W10, 001-0021, Sapporo, Japan.
Catalysis Today
|July 19, 2018
Summary
Silver nanoparticles (NPs) on octahedral anatase particles (OAPs) enhance photocatalytic activity under UV and visible light. Electron traps on OAPs guide silver NP formation, improving performance for environmental applications.
Area of Science:
- Materials Science
- Nanotechnology
- Photocatalysis
Background:
- Octahedral anatase particles (OAPs) are explored for photocatalytic applications.
- Silver nanoparticles (NPs) can enhance the performance of photocatalysts.
Purpose of the Study:
- To modify OAPs with silver NPs using photodeposition.
- To investigate the influence of OAP properties on silver NP formation and photocatalytic activity.
- To evaluate the photocatalytic performance under UV and visible light irradiation.
Main Methods:
- Photodeposition of silver nanoparticles onto octahedral anatase particles.
- Characterization using XRD, STEM, DRS, XPS, and time-resolved microwave conductivity (TRMC).
- Photocatalytic activity testing for acetic acid decomposition (UV) and 2-propanol oxidation (vis).
Main Results:
- Electron traps (ETs) on OAPs act as nucleation sites for silver NPs, favoring smaller NPs on smaller OAPs with higher ET content.
- Silver modification significantly enhanced photocatalytic activity under both UV and visible light.
- Larger silver NP crystallite size and polydispersity led to broader plasmon resonance, boosting visible light activity.
- Slower TRMC signal decay correlated with higher photocatalytic activity, indicating improved charge carrier dynamics.
Conclusions:
- The properties of OAPs, particularly electron traps, critically influence silver NP deposition and subsequent photocatalytic efficiency.
- Silver-modified OAPs demonstrate superior photocatalytic performance for environmental remediation under both UV and visible light.
- Understanding the structure-property-activity relationships is key for designing advanced photocatalysts.
Keywords:
AOPs, advanced oxidation processesCDT, time needed for complete deposition of silverDRS, diffuse reflectance spectroscopyETs, electron trapsHT, hydrothermal reactionLSPR, localized surface plasmon resonanceNPs, nanoparticlesOAPs, octahedral anatase particlesOctahedral anatase particlesPhotocatalytic activityPlasmonic photocatalystsSSA, specific surface areaSTEM, scanning transmission electron microscopySilver NPsSurface modificationTNWs, potassium titanate nanowiresTRMC, time-resolved microwave conductivityTitaniaUS, ultrasonicationXPS, X-ray photoelectron spectroscopyXRD, X-ray diffraction
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