Metal nanoparticles decorated sodium alginate‑carbon nitride composite beads as effective catalyst for the reduction of organic pollutants.

International Journal of Biological Macromolecules
Sher Bahadar KhanEsraa M Bakhsh

Abstract

Herein, a simple method is used for fabrication of carbon nitride (g-C3N4) incorporated sodium alginate (Alg) beads. The alginate carbon nitride beads (Alg-CNBs) were prepared by introducing the g-C3N4 dispersed Alg aqueous solution to a divalent Ca2+ ions solution. Alg-CNBs were further treated with different transition metal salt solutions. The surface coated transition metal ions on Alg-CNBs were reduced to zero-valent state (M0), through strong reducing agent NaBH4, and used for the catalytic reduction of different organic dyes. The surface morphology of all catalysts was investigated by FE-SEM and metal uptake capacity was investigated by ICP-OES. The prepared M0/Alg-CNBs (where M0 = Ag0, Ni0, Fe0 and Cu0) catalysts were tested against the reduction of 4-nitrophenol (4-NP) to recognize the fastest one. Among all the catalysts, the Cu0/Alg-CNBs efficiently reduced 4-NP to 4-aminophenol (4-AP). Cu0/Alg-CNBs was used further for the reduction of methyl orange (MO), congo red (CR), 2-nitrophenol (2-NP) and 2,6-dinitrophenol (2,6-DNP). The MO, CR and 4-NP was reduced with rate constant of 0.135, 0.077 and 0.384 min-1, respectively. For large scale and continuous reduction of 4-NP to 4-AP, the column was packed with 0.15 g catal...Continue Reading

Citations

Jul 21, 2021·International Journal of Biological Macromolecules·Esraa M BakhshAbdullah M Asiri

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