Activated carbons and other carbon-based adsorbents like biochars have been shown to exhibit high TCS removal efficiencies. Although hydrophobic high-silica zeolites are more expensive to produce than these materials, they possess some advantages, such as high thermal and chemical stability, allowing for regeneration under fairly harsh conditions, reduced co-adsorption of natural organic matter, and high affinities towards species that fit well into the ordered pore system of the zeolite. Rossner et al. studied the removal of a "cocktail" of 25 organic contaminants, including TCS with an initial concentration of about 0.6 µg L -1 , from spiked lake water by two high-silica zeolites. Whereas high-silica mordenite (MOR framework type ) showed essentially complete removal of TCS (along with various other species), FAU-type zeolite Y removed only about 45%. Since the FAU-type sample should be more hydrophobic due to its higher Si/Al ratio (Si/Al ≈ 400 as compared to Si/Al ≈ 110 for MOR), this difference cannot be attributed to the zeolite composition, but is more likely related to differences in pore size and topology: Both zeolites have pore apertures outlined by 12-membered rings (12MRs) of tetrahedrally coordinated atoms, but the MOR framework possesses 1D channels with a diameter of about 6.5 Å, whereas the pore system of FAU consists of large supercages (diameter about 11 Å) connected by 12MR windows. More recently, Jiang et al. measured TCS adsorption isotherms (aqueous solution, concentrations ranging from ~200 to ~6,000 µg L -1 ) using zeolites with four different framework types: In addition to FAU-and MOR-type zeolites, zeolite beta (BEA framework, 12MR pore openings) and ZSM-5 (MFI framework, 10MR pore openings) were considered, and samples with different Si/Al ratios were compared for FAU, BEA, and MFI.