5 years ago

Silica-Silver Nanocomposites as Regenerable Sorbents for Hg0 Removal from Flue Gases

Silica-Silver Nanocomposites as Regenerable Sorbents for Hg0 Removal from Flue Gases
managing.editor@est.acs.org (American Chemical Society)
Silica-silver nanocomposites (Ag-SBA-15) are a novel class of multifunctional materials with potential applications as sorbents, catalysts, sensors, and disinfectants. In this work, an innovative yet simple and robust method of depositing silver nanoparticles on a mesoporous silica (SBA-15) was developed. The synthesized Ag-SBA-15 was found to achieve a complete capture of Hg0 at temperatures up to 200 °C. Silver nanoparticles on the SBA-15 were shown to be the critical active sites for the capture of Hg0 by the Ag–Hg0 amalgamation mechanism. An Hg0 capture capacity as high as 13.2 mg·g–1 was achieved by Ag(10)-SBA-15, which is much higher than that achievable by existing Ag-based sorbents and comparable with that achieved by commercial activated carbon. Even after exposure to more complex simulated flue gas flow for 1 h, the Ag(10)-SBA-15 could still achieve an Hg0 removal efficiency as high as 91.6% with a Hg0 capture capacity of 457.3 μg·g–1. More importantly, the spent sorbent could be effectively regenerated and reused without noticeable performance degradation over five cycles. The excellent Hg0 removal efficiency combined with a simple synthesis procedure, strong tolerance to complex flue gas environment, great thermal stability, and outstanding regeneration capability make the Ag-SBA-15 a promising sorbent for practical applications to Hg0 capture from coal-fired flue gases.

Publisher URL: http://dx.doi.org/10.1021/acs.est.7b01701

DOI: 10.1021/acs.est.7b01701

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