Green synthesis and <i>in situ</i> immobilization of gold nanoparticles and their application for the reduction of <i>p</i>-nitrophenol in continuous-flow mode

Szűcs, Rózsa; Balogh‐Weiser, Diána; Sánta-Bell, Evelin; Tóth–Szeles, Eszter; Varga, Tamás; Poppe, László; Lagzi, István

doi:10.1039/c8ra10373a

Cited by 10 publications

(7 citation statements)

References 28 publications

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“…9B). These experiments assess, that components of Broth are enough to cause reduction of the MNPs but the presence of agar in our experiments demonstrated not only the reducing power as previously reported 22 but an important role for colloidal stability of MNPs. It is important to mention that when controls with MB solution + HAuCl 4 and Eosin + HAuCl 4 were subjected to UV-VIS scanning, AuNPs were not obtained (see supplementary information, Figs.…”

Section: Resultssupporting

confidence: 85%

“…Nowadays, there are several approaches reported to accomplish the green synthesis of NPs by using: extracellular or intracellular extracts of thermophilic filamentous fungi 18 , Trichoderma viride 19 filtrate, glycolipids from Lactobacillus casei 20 and other bacterial culture media supernatants 21 . Although experimentation with agars in order to obtain metal nanostructures had begun to be implemented 22 , there is still several methodological strategies unexplored using agars as solely reducing and stabilizing agent. Agars are mixtures of compounds that are typically used for microorganism’s growth.…”

Section: Introductionmentioning

confidence: 99%

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One-step synthesis of gold and silver non-spherical nanoparticles mediated by Eosin Methylene Blue agar

Lomelí-Rosales

Zamudio‐Ojeda

Cortés-Llamas

et al. 2019

Sci Rep

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Nowadays, there are several approaches reported to accomplish the green synthesis of metal nanoparticles by using bacterial and fungi supernatants or by-products generated by these microorganisms. Therefore, agars as solely reductive regents have started to be used in order to obtain metal nanoparticles. This paper shows the results of the synthesis of gold and silver nanoparticles with different morphology, mainly triangular and truncated triangular, using Eosin Methylene Blue (EMB) agar as reducing agent. To control the reaction process, the necessary activation energy for the reducer was provided by three different techniques: microwave radiation, using a domestic microwave oven, ultraviolet radiation, and heating on a conventional plate. The evolution of the reduction process and stability of the samples was performed by ultraviolet visible spectroscopy. Morphology was carefully analyzed using high-resolution transmission electron microscopy (HRTEM) and Transmission electron microscopy (TEM). A one step synthesis for gold and silver nanoparticles was optimized with an eco-friendly and economic process.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

One-step synthesis of gold and silver non-spherical nanoparticles mediated by Eosin Methylene Blue agar

Lomelí-Rosales

Zamudio‐Ojeda

Cortés-Llamas

et al. 2019

Sci Rep

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“…The agarose itself, as a polysaccharide, can reduce Au 3+ to Au 0 and produce AuNPs at elevated temperature (∼70−90 °C). 39 Therefore, the agarose concentration was reduced to the value at which no formation of AuNPs was observed at room temperature, and the gel matrix was solid enough to provide a medium for convectionfree mass transport of the reagents realized solely by diffusion. Additionally, the gel matrix prevents the sedimentation of the formed particles.…”

Section: Resultsmentioning

confidence: 99%

“…The concentration of the citrate was set to be greater than that of the gold salt because excess of the citrate is needed in the synthesis of AuNPs, and second, it ensured that the formation of the particles occurred also at the bottom part of the gel column. The agarose itself, as a polysaccharide, can reduce Au 3+ to Au 0 and produce AuNPs at elevated temperature (∼70–90 °C) . Therefore, the agarose concentration was reduced to the value at which no formation of AuNPs was observed at room temperature, and the gel matrix was solid enough to provide a medium for convection-free mass transport of the reagents realized solely by diffusion.…”

Section: Results and Discussionmentioning

confidence: 99%

Reaction–Diffusion Assisted Synthesis of Gold Nanoparticles: Route from the Spherical Nano-Sized Particles to Micrometer-Sized Plates

et al. 2021

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The design of nanoparticles of desired sizes and shapes and 2D nanostructured materials is challenging and important due to their unique physical and chemical properties. One of the most common methods for the generation of metal nanoparticles is the wet synthetic route in which metal ions are reduced and the formed particles are stabilized in the liquid phase. Here we show a facile and powerful method to synthesize gold nanoparticles in a solid agarose gel utilizing the diffusion of reagents using the Turkevich method at room temperature. Our technique yields particles spatially separated by their sizes and shapes (spheres and plates) in the gel column. We have achieved 4 orders of magnitude difference in the sizes of the synthesized particles with a linearly increasing trend in the function of their spatial position. We have also generated micrometer-sized nanoplates with triangle, truncated triangle, or hexagon shapes attaining almost the length-to thickness ratio of 500, representing the magnificent power of the reaction–diffusion assisted synthesis.

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“…We carried out the synthesis in a similar manner; we used a four- or ten-fold excess of citrate ([Au(III)] 0 = 1 mM), and the time of synthesis was reduced to 6–24 h (see Materials and Methods). Since the agarose (which is a polysaccharide) reduces Au(III) and facilitates the production of AuNPs 53 (see Supplementary Fig. S12 ), we replaced the agarose hydrogel matrix with a polyacrylamide block.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of zeolitic imidazolate framework-8 and gold nanoparticles in a sustained out-of-equilibrium state

Dúzs

Holló

Schuszter

et al. 2022

Sci Rep

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The design and synthesis of crystalline materials are challenging due to the proper control over the size and polydispersity of the samples, which determine their physical and chemical properties and thus applicability. Metal − organic frameworks (MOFs) are promising materials in many applications due to their unique structure. MOFs have been predominantly synthesized by bulk methods, where the concentration of the reagents gradually decreased, which affected the further nucleation and crystal growth. Here we show an out-of-equilibrium method for the generation of zeolitic imidazolate framework-8 (ZIF-8) crystals, where the non-equilibrium crystal growth is maintained by a continuous two-side feed of the reagents in a hydrogel matrix. The size and the polydispersity of the crystals are controlled by the fixed and antagonistic constant mass fluxes of the reagents and by the reaction time. We also present that our approach can be extended to synthesize gold nanoparticles in a redox process.

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Green synthesis and in situ immobilization of gold nanoparticles and their application for the reduction of p-nitrophenol in continuous-flow mode

Abstract: Gold nanoparticles synthesized using agarose and supported in macroporous polymer beads were used in continuous-flow mode in reduction of p-nitrophenol by sodium borohydride.

Cited by 10 publications

References 28 publications

One-step synthesis of gold and silver non-spherical nanoparticles mediated by Eosin Methylene Blue agar

One-step synthesis of gold and silver non-spherical nanoparticles mediated by Eosin Methylene Blue agar

Reaction–Diffusion Assisted Synthesis of Gold Nanoparticles: Route from the Spherical Nano-Sized Particles to Micrometer-Sized Plates

Synthesis of zeolitic imidazolate framework-8 and gold nanoparticles in a sustained out-of-equilibrium state

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