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Nanoparticle-Imprinted Silica Gel for the Size-Selective Capture of Silver Ultrafine Nanoparticles from Water. | LitMetric

AI Article Synopsis

  • A method was developed to create silica gel monoliths that contain well-separated spherical nanoparticles (NPs) of silver or gold, with sizes ranging from 8 to 115 nm.
  • The process involved using specific chemicals to oxidize and extract silver NPs and to dissolve gold NPs from silica, leaving behind spherical voids that matched the original NP sizes.
  • The resulting silica powers demonstrated the ability to selectively reabsorb ultrafine silver NPs from water, highlighting their potential use for filtering and safely disposing of these materials from the environment.

Article Abstract

A synthetic approach has been developed to prepare silica gel monoliths that embed well separated silver or gold spherical nanoparticles (NP), with diameters of 8, 18 and 115 nm. Fe, O/cysteine and HNO were all successfully used to oxidize and remove silver NP from silica, while aqua regia was necessary for gold NP. In all cases, NP-imprinted silica gel materials were obtained, with spherical voids of the same dimensions of the dissolved particles. By grinding the monoliths, we prepared NP-imprinted silica powders that were able to efficiently reuptake silver ultrafine NP (Ag-ufNP, d = 8 nm) from aqueous solutions. Moreover, the NP-imprinted silica powders showed a remarkable size selectivity, based on the best match between NP radius and the curvature radius of the cavities, driven by the optimization of attractive Van der Waals forces between SiO and NP. Ag-ufNP are increasingly used in products, goods, medical devices, disinfectants, and their consequent diffusion in the environment is of rising concern. Although limited here to a proof-of-concept level, the materials and methods described in this paper may be an efficient solution for capturing Ag-ufNP from environmental waters and to safely dispose them.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10223345PMC
http://dx.doi.org/10.3390/molecules28104026DOI Listing

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