Selective and high capacity recovery of aqueous Ag(I) by thiol functionalized mesoporous silica sorbent

0577218 - ÚJF 2024 RIV NL eng J - Journal Article
Herman, P. - Percsi, D. - Fodor, T. - Dudas, Z. - Horvath, Z. E. - Ryukhtin, Vasil - Putz, A.-M. - Kalmar, J. - Almásy, L.
Selective and high capacity recovery of aqueous Ag(I) by thiol functionalized mesoporous silica sorbent.
Journal of Molecular Liquids. Roč. 387, OCT (2023), č. článku 122598. ISSN 0167-7322. E-ISSN 1873-3166
Research Infrastructure: CICRR - 90241
Institutional support: RVO:61389005
Keywords : Silver * Recovery * Sorption * Mesoporous silica * Surface complexation
OECD category: Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
Impact factor: 6, year: 2022
Method of publishing: Open access
https://doi.org/10.1016/j.molliq.2023.122598

A simplified sol-gel method was developed for the preparation of thiol functionalized porous silica particles using (3-mercaptopropyl)-trimethoxy-silane (MPTMS) for co-gelation in the presence of micellar templates. The resulting short range ordered porous silica microparticles are exceptionally effective sorbents of aqueous Ag(I). The binding of aqueous Ag(I) is almost stoichiometric in the broad pH range between 4.0 and 9.0 even at low Ag (I) concentrations until reaching the limiting 238 mg g(-1) sorption capacity. The sorbent displays high selectivity towards Ag(I), which was tested in the simultaneous presence of several different metal compounds. The practically complete recovery of Ag(I) and the regeneration of the sorbent was achieved by washing with a 10 mM Na2S2O3 solution. X-ray photoelectron spectroscopy (XPS) revealed that silver is not reduced on the surface of the sorbent. The reason for the strong and selective binding of Ag(I) is the formation of layered thiolate coordination compounds on the functionalized silica surface that display characteristically high stability even in the presence of other competing metal ions.
Permanent Link: https://hdl.handle.net/11104/0346433