 | Clean Technology 2007
Technical Proceedings of the 2007 Clean Technology Conference and Trade Show
Chapter 8: Nanoparticle Processes & Applications |
| | Functionalized Nanoporous Ceramic Sorbents for Removal of Mercury and Other Contaminants | | Authors: | S.V. Mattigod, G.E. Fryxell, R. Skaggs and K.E. Parker | | Affilation: | Pacific Northwest National Laboratory, US | | Pages: | 259 - 261 | | Keywords: | nanoporus, ceramic, functionalization, sorbents | | Abstract: | A new class of high-performance nanoporous sorbents has been developed for heavy metal removal that overcomes the deficiencies of existing technologies. These novel materials are created from a combination of synthetic mesoporous ceramic substrates that have specifically tailored pore sizes (2 to 10 nm) and very high surface areas (~1000 m2/g) with self-assembled monolayers of well-ordered functional groups that have high affinity and specificity for specific types of free or complex cations or anions. These sorbents known as SAMMS™ (Self-Assembled Monolayers on Mesoporous Silica) are hybrids of two frontiers in materials science: molecular self-assembly techniques and nanopororous materials. One form of SAMMS™ containing monolayers of mercaptopropyl- trismethoxy silane has shown exceptional sorptive properties for mercury and other soft cations such as silver, cadmium, and lead. Another form of SAMMS™ with a functional monolayer consisting of ethylenediamine-Cu(II) complex (Cu-EDA) specifically adsorbs tetrahedral oxyanions such as arsenate, selenate, molybdate, chromate and pertechnetate even in the presence of high concentrations of sulfate. Separation of actinides can be addressed by SAMMS™ material synthesized with a set of monolayer functionalities consisting of hydroxypyridinones, acetamide and propinamide phosphonates. These nanoporous sorbents offer a better choice for efficient and cost-effective removal contaminants from diverse waste streams. |  | This paper is available to CTSI members in PDF© format. | | ISBN: | 1-4200-6382-0 |
| Pages: | 338 |
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