Development of a Novel Mercury Cartridge for Mercury Analysis
TL;DR: In this article, the performance of Au/SiO2 and Ag/MC-based mercury cartridges in capturing low-level mercury in Ar-, SO2-, and NO-containing gas streams was investigated systematically.
Abstract: Mercury cartridges, which are a key component of semicontinuous online mercury monitors, capture low-concentration mercury from the effluent streams of coal-fired power plants and subsequently release highly concentrated pulses of mercury for spectroscopic analysis. The most common sorbent used in mercury cartridges is gold-coated silica beads (Au/SiO2), which form a reversible amalgam with elemental mercury. Ag/MC is a robust composite mercury sorbent, consisting of silver nanoparticles supported on the surface of natural chabazite, which can efficiently capture and release mercury from a real flue gas environment, making the material a potential alternative to Au/SiO2 in mercury preconcentration cartridges. The performance of Au/SiO2- and Ag/MC-based mercury cartridges in capturing low-level mercury in Ar-, SO2-, and NO-containing gas streams was investigated systematically. Both SO2 and NO were determined to be harmful to the performance of an Au/SiO2 mercury cartridge. NO had limited impact on the per...
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TL;DR: 15% Mn/γ-Fe(2)O(3)-250 may be a promising sorbent for elemental mercury capture in the presence of a high concentration of SO(2).
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TL;DR: Vermiculite decorated with copper nanoparticles is a new antibacterial material that was prepared in this study through ion-exchange process and hydrogen reduction as discussed by the authors, the replacement of magnesium ions in interlayer structure was carried out using concentrated copper sulfate solutions at elevated temperature.
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Cites background from "Development of a Novel Mercury Cart..."
...Fusion of metallic nanoparticles in the structure of aluminosilicates is a relatively new approach and only a few reports have been presented on this topic [22, 41-46]....
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TL;DR: 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 Hg 0 capture from coal-fired flue gases.
Abstract: 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 reg...
45 citations
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TL;DR: In this paper, a magnetically responsive catalytic sorbent was proposed and synthesized with a potential application to simultaneous removal of Hg 0 and NO at low temperature from the flue gases of coal-fired power plants.
27 citations