SYNTHESIS OF BIOSOURCED SILICA–AG NANOCOMPOSITES AND AMALGAMATION REACTION WITH MERCURY IN AQUEOUS SOLUTIONS
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Date
2021-05-06
Authors
Azat, Seitkhan
Arkhangelsky, Elizabeth
Papathanasiou, Thanasis
Zorpas, Antonis A.
Abirov, Askar
Inglezakis, Vassilis J.
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
This paper focuses on the synthesis of a new silver nanocomposite adsorbent derived from
rice husk as raw material. The synthesis is based on triethoxysilane chemistry and the reduction of
silver without the aid of reductant chemicals. The derived AgNPs@SiO2 nanocomposites are fully
characterized and then used for the removal of mercury (II) from aqueous solutions. The results
demonstrated that the affinity of the composite for mercury is high and the removal mechanism is
adsorption accompanied by a redox reaction between mercury and silver followed by the formation of
calomel and amalgams between silver and mercury. The silver–mercury reaction is complex, and its
stoichiometry seems to scale with the silver content. Besides the importance of the surface reactions,
the successful implementation of biosourced silica for mercury removal from water is useful for the
development of strategies for the valorization of agricultural waste and boosts the concept of circular
economy and bioeconomy
Description
Keywords
Rice husk silica, biosourced silica, silver nanoparticles, nanocomposites, silicon hydride, mercury, amalgamation, Type of access: Open Access, Research Subject Categories::TECHNOLOGY
Citation
Azat, S., Arkhangelsky, E., Papathanasiou, T., Zorpas, A. A., Abirov, A., & Inglezakis, V. J. (2020). Synthesis of biosourced silica–Ag nanocomposites and amalgamation reaction with mercury in aqueous solutions. Comptes Rendus. Chimie, 23(1), 77–92. https://doi.org/10.5802/crchim.19