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. 2022 Sep 20;7(39):35023-35034.
doi: 10.1021/acsomega.2c03784. eCollection 2022 Oct 4.

Mono- and Bimetallic Nanoparticles for Catalytic Degradation of Hazardous Organic Dyes and Antibacterial Applications

Shilpa Molakkalu Padre  1   2 , S Kiruthika  3 , Shridhar Mundinamani  4 , Ravikirana  5 , Srivathsava Surabhi  6   7 , Jong-Ryul Jeong  7 , Kunabevu Mallikarjunappa Eshwarappa  8 , Mudiyaru Subrahmanya Murari  9 , Vignesh Shetty  10 , Mamatha Ballal  11 , Gurumurthy S C  1
Affiliations

Mono- and Bimetallic Nanoparticles for Catalytic Degradation of Hazardous Organic Dyes and Antibacterial Applications

Shilpa Molakkalu Padre et al. ACS Omega. .

Abstract

In the present work, gold (Au), silver (Ag), and copper (Cu) based mono- and bimetallic NPs are prepared using a cost-effective facile wet chemical route. The pH for the synthesis is optimized in accordance with the optical spectra and supported by the finite difference time domain simulation studies. FESEM and TEM micrographs are used to analyze the morphology of the prepared nanoparticles. TEM images of bimetallic nanoparticles (BMPs) verified their bimetallic nature. XRD studies confirmed the formation of fcc-structured mono- and bimetallic NPs. Photoluminescence studies of the as-synthesized NPs are in good agreement with the previous publications. These synthesized NPs showed enhanced catalytic activity for the reduction/degradation of 4-nitrophenol, rhodamine B, and indigo carmine dyes in the presence of sodium borohydride (NaBH4) compared to NaBH4 alone. For the reduction of 4-nitrophenol, Au, Cu, and CuAg nanoparticles exhibited good catalytic efficiency compared to others, whereas for the degradation of rhodamine B and indigo carmine dyes the catalytic efficiency is comparatively high for CuAg BMPs. Furthermore, the antibacterial assay is carried out, and Ag NPs display effective antibacterial activity against Klebsiella pneumoniae, Salmonella ser. Typhimurium, Acinetobacter baumannii, Shigella flexneri, and Pseudomonas aeruginosa.

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Conflict of interest statement

The authors declare no competing financial interest.

Figures

Figure 1
Figure 1
Optical absorption spectra of (a) Au, (b) Ag, (c) Cu, (d) AuAg, and (e) CuAg NPs as a function of pH.
Figure 2
Figure 2
FESEM images of (a) Au, (b) Ag, (c) Cu, (d) AuAg, and (e) CuAg NPs.
Figure 3
Figure 3
TEM images of (a) AuAg and (d) CuAg, respectively. TEM images of (b) AuAg and (e) CuAg with high resolution. Particle size distribution histogram of (c) AuAg and (f) CuAg BMPs. (g) High-resolution TEM image of CuAg BMP with interplanar spacings corresponding to Cu(111) and Ag(111) planes.
Figure 4
Figure 4
XRD data of the (a) Au, (b) Ag, (c) Cu, (d) CuAg, and (e) AuAg NPs. The peak represented as * is due to the formed Cu2O because of ambient oxidation.
Figure 5
Figure 5
PL spectra of (a) Au, (b) Ag, (c) Cu, (d) AuAg, and (e) CuAg NPs.
Figure 6
Figure 6
Absorption spectra of 4-nitrophenol in the presence of NaBH4 and (a) Au, (b) Ag, (c) Cu, (d) AuAg, (e) CuAg, and (f) without NPs, with respect to time. Optical image of 4-nitrophenol before and after catalytic degradation (inset).
Figure 7
Figure 7
Dye degradation (%/min) in the presence of as-synthesized nanoparticles.
Figure 8
Figure 8
(a) Mueller–Hinton Agar well diffusion method for evaluating antibacterial activity of Au, Ag, and Cu NPs against P. aeruginosa. (b) Bar chart of the inhibition zone for Ag nanoparticles.
See this image and copyright information in PMC

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