Synthesis of Nature-mimicking Silver Nanoparticles in the Presence Humicтезисы доклада

Работа с тезисами доклада

[1] Synthesis of nature-mimicking silver nanoparticles in the presence humic / I. O. Grigoryeva, N. A. Kulikova, A. B. Volikov et al. // Book of Abstracts. Fourth International Conference of CIS IHSS on Humic Innovative Technologies From Molecular Analysis of Humic Substances – to Nature-like Technologies (HIT-2017). — ООО "КЛУБ ПЕЧАТИ" Москва, 2017. — P. 104–104. At present, there has been a steady increase in the production of nanomaterials possessing unique properties such as thermal, optical, physical, chemical, magnetic etc. One of the most preferred nanoparticles are silver ones (AgNP) due to their active use primarily as a universal antiseptic agent inhibiting the growth of pathogenic microorganisms. The major drawback of AgNP fabrication is a use either high energyconsuming physical processes or toxic compounds (organic solvents, reducing agents and stabilizers) in their synthesis [1]. In the case of AgNP is especially critical, since the residual content of toxic reagents prevents the application of AgNP for medical purposes. Therefore, increasing attention is paid to the search for alternative ways of synthesis of AgNP using environmentally friendly technologies. Our work aimed at study of AgNP formation in the presence of humis substances (HS) of different origin. This approach is based on simulation of Ag+ interaction with in the environment. To reach this goal, synthesis of AgNP in the presence of HS was carried out at 25C under 12-h photoperiod. Silver ions was introduced as AgNO3 to reach final concentration 0.01 M, and concentration of HS was 1 g/L. Ten HS of different origin including soil, peat and coal humic acids (HA) and fulvic acids (FA) were used. HS were described using elemental analysis, gel permeation chromatography and 13C NMR. AgNP formation was monitored using UV/Vis spectrophotometry, and the end Ag+ – HS interaction was detected when peak corresponding AgNP at ca. 400 nm stopped its growth. In parallel, pH and Eh were monitored during all over the experiment. Our results showed different rate of AgNP formation in the presence of HS depending HS properties reaching maximum in case with sod-podzolic soil FA and minimum in case with HA extracted from chernozem while peat and coal HS demonstrated intermediate rates. In general, higher rate was observed for HS with greater content of aliphatic moieties in their structure. During AgNP formation values of Eh increased from ca. 0.2 to ca. 0.5 V indicating the oxidation of HS. Together with Eh growth, substantial pH decrease was detected. Therefore, carboxylic group formation in the HS structure could be hypothesized during AgNP formation. References 1. Shah M., Fawcett D., Sharma S., Tripathy S. K., Poinern G. E. J. Green Synthesis of Metallic Nanoparticles via Biological Entities // Materials. 2015. 8:7278–7308. doi:10.3390/ma8115377. This research was supported by the Russian Science Foundation grant 16-14-00167.

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