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. 2024 Oct 4:15:1227-1237.
doi: 10.3762/bjnano.15.99. eCollection 2024.

Enhanced catalytic reduction through in situ synthesized gold nanoparticles embedded in glucosamine/alginate nanocomposites

Chi-Hien Dang  1   2 , Le-Kim-Thuy Nguyen  1 , Minh-Trong Tran  1 , Van-Dung Le  1 , Nguyen Minh Ty  1 , T Ngoc Han Pham  3 , Hieu Vu-Quang  3 , Tran Thi Kim Chi  4 , Tran Thi Huong Giang  4 , Nguyen Thi Thanh Tu  5 , Thanh-Danh Nguyen  1   2
Affiliations

Enhanced catalytic reduction through in situ synthesized gold nanoparticles embedded in glucosamine/alginate nanocomposites

Chi-Hien Dang et al. Beilstein J Nanotechnol. .

Abstract

This study introduces a highly efficient and straightforward method for synthesizing gold nanoparticles (AuNPs) within a glucosamine/alginate (GluN/Alg) nanocomposite via an ionotropic gelation mechanism in aqueous environment. The resulting nanocomposite, AuNPs@GluN/Alg, underwent thorough characterization using UV-vis, EDX, FTIR, SEM, TEM, SAED, and XRD analyses. The spherical AuNPs exhibited uniform size with an average diameter of 10.0 nm. The nanocomposites facilitated the recyclable reduction of organic dyes, including 2-nitrophenol, 4-nitrophenol, and methyl orange, employing NaBH4 as the reducing agent. Kinetic studies further underscored the potential of this nanocomposite as a versatile catalyst with promising applications across various industrial sectors.

Keywords: catalysis; gold nanoparticles; organic dyes; organometallic nanocomposites; reduction.

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Conflict of interest statement

The authors declare that they have no conflicts of interest.

Figures

Figure 1
Figure 1
Schematic workflow illustration of the current study.
Figure 2
Figure 2
UV–vis spectra of AuNPs@GluN/Alg measured under varying reaction conditions (left) and plots of absorbance as function of various synthesis parameters (right). (A, B) Au3+ ions-to-gel ratio (w/w), (C, D) reaction temperature, and (E and F) reaction time. The upper photographs showing the corresponding color change.
Figure 3
Figure 3
(A) Zeta potential curves, (B) FTIR spectra, (C) EDX spectrum and elemental composition (AuNPs@GluN/Alg only), and (D) TGA curves of GluN/Alg and AuNPs@GluN/Alg nanocomposites.
Figure 4
Figure 4
(A, B) SEM images with different magnifications, (C, D) TEM images with different magnifications, and (E) XRD and (F) SAED patterns of the AuNPs@GluN/Alg nanocomposite.
Figure 5
Figure 5
Proposed mechanism of the reduction of 2-NiP, 4-NiP, and MO using NaBH4 in the presence of AuNPs@GluN/Alg catalyst.
Figure 6
Figure 6
UV–vis spectra during the reduction of 2-NiP (A, B), 4-NiP (E, F), and MO (I, J) without and with nanocatalyst and plots of kinetic data and recyclability regarding 2-NiP (C, D), 4-NiP (G, H), and MO (K, L).
See this image and copyright information in PMC

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