Highly efficient recyclable bismuth nanocatalysts fabricated using a facile one-step aqueous method for faster reduction of azo dye contaminants

Easily accessible robust synthesis of metallic nanoparticles (NPs) and their colloidal stabilization via successive surface functionalization with desired molecules are crucial for catalytic applications. In this research, tannic acid (TA)-functionalized bismuth (Bi)-based novel NPs were prepared vi...

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Bibliographic Details
Published in:RSC advances 2024-08, Vol.14 (34), p.24447-24461
Main Authors: Rahman, Md. Ataur, Rahman, Md. Abdur, Rabbi, Md. Ahasanur, Rana, Masud, Karim, Md. Rabiul, Jalil Miah, M. A, Ahmad, Hasan
Format: Article
Language:English
Subjects:
Azo dyes
Bismuth
Building components
Catalysts
Chemical reduction
Chemical synthesis
Chemistry
Colloids
Contaminants
Electron transfer
Methylene blue
Nanoparticles
Surface charge
Surface stability
Synergistic effect
Tannic acid
Thermal stability
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Summary:Easily accessible robust synthesis of metallic nanoparticles (NPs) and their colloidal stabilization via successive surface functionalization with desired molecules are crucial for catalytic applications. In this research, tannic acid (TA)-functionalized bismuth (Bi)-based novel NPs were prepared via a simple in situ aqueous reduction of Bi 3+ ions for the catalytic reduction of azo groups. The synthesis, morphology, and structure of Bi/TANPs were confirmed through spectroscopic, electron microscopic and X-ray diffraction analyses. The Bi/TANPs comprise Bi, carbon, oxygen and sodium as building components and possess a high negative surface charge of −58 mV, colloidal dispersity, thermal stability and crystalline structure. The Bi/TANPs are almost spherical shaped with an average diameter of 33 nm. The surface of the catalyst is mesoporous with a high specific surface area of 267 m 2 g −1 . The designed Bi/TANPs exhibit pH-specific affinity for azo dye molecules and reduced azo moieties in the presence of aqueous NaBH 4 without requiring any hydrogen gas supply. The catalytic reduction efficiencies of Bi/TANPs against methylene blue and Congo red are almost 100%. These reduction reactions are very fast owing to the presence of TA moieties on the catalyst surface, which facilitate direct electron transfer to azo groups, and follow a pseudo-first-order kinetic model. The catalyst is mechanically recyclable, and shows a minimal loss (
ISSN:2046-2069
2046-2069
DOI:10.1039/d4ra04625k