Decoration of ZnO surface with tiny sulfide-based nanoparticles for improve photocatalytic degradation efficiency

Modifying wide band gap ZnO nanoparticles surface by combine narrow bandgap semiconductors is a novel route to promote the ZnO to diverse applications. Herein, different metal sulfides (CdS, Ag2S and Bi2S3) were decorated on ZnO surface using facile a chemical route for photocatalytic application. C...

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Published in:Environmental research 2023-03, Vol.220, p.115171-115171, Article 115171
Main Authors: Murugadoss, Govindhasamy, Salla, Sunitha, Kumar, Manavalan Rajesh, Kandhasamy, Narthana, Al Garalleh, Hakim, Garaleh, Mazen, Brindhadevi, Kathirvel, Pugazhendhi, Arivalagan
Format: Article
Language:English
Subjects:
Decoration
Metal Nanoparticles
Nanoparticles
Photocatalytic degradation
Photolysis
Porous materials
Sulfides
Sunlight
Surface modification
Zinc oxide
Zinc Oxide - chemistry
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Summary:Modifying wide band gap ZnO nanoparticles surface by combine narrow bandgap semiconductors is a novel route to promote the ZnO to diverse applications. Herein, different metal sulfides (CdS, Ag2S and Bi2S3) were decorated on ZnO surface using facile a chemical route for photocatalytic application. Crystal structure, surface morphology and optical changes for the surface modified ZnO were studied by using various characterization techniques. The XRD spectra exhibited mixed phase of decorated metal sulfide nanoparticles along with strong pattens of hexagonal structure ZnO. The SEM images were confirmed that tiny CdS, Ag2S and Bi2S3 sulfide nanoparticles are well decorated on ZnO hexagonal rods surface. Band gap of the ZnO was tuned into visible region by modifying the surface by the sulfide nanoparticles. Textile industry-based crystal violet (CV) dye was used as a model pollutant to evaluate the photocatalytic activity of sulfides decorated well-crystalline ZnO photocatalysts under natural sunlight. Among the three catalysts, the Ag2S decorated ZnO achieved greatest photodegradation efficiency of 94.1% for degradation of the CV dye with rate constant value of 0.050. The highest catalytic activity may be related to Ag2S acting a significant part in reducing bandgap and boosting hole, superoxide radical, and hydroxyl radical formation, which inhibits recombination, hence enhancing the photocatalyst's efficacy, activity, and also stability.
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2022.115171