PRODUCT DATA SHEET
Surfactant Modified Zeolite
We have found that the charge-balancing cations present on the raw zeolite surface (typically Na+, K+, Ca2+, and Mg2+) can be replaced by high-molecular-weight quaternary amines such as hexadecyltrimethylammonium (HDTMA). These quaternary amines ( also known as cationic surfactants) exchange quantitatively and essentially irreversibly with cations on the external surface of the zeolite. The quaternary amines are too large to enter the internal pore structure of the zeolite, and the internal or zeo litic exchange sites potentially remain available to sorb smaller inorganic cations.
Due to its low cost, ability to sorb multiple types of contaminants simultaneously, and its "tuneable" permeability, SMZ is suited for applications where large volumes of sorbent are required. Examples of a few of these potential applications are shown below.
In particular, SMZ is attractive for use in subsurface permeable barriers for retarding contaminant migration.
Design schematic of the SMZ Pilot Project Barrier at OGI
All images created by LRJ Graphics
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