“…Layered double hydroxides are known for their unique anion exchange properties (e.g., Newman and Jones, 1998) which allows for various organic or inorganic anions to be present in the interlayer space. Recently, the sorption of organic compounds such as anionic organic toxicants (Ulibarri et al, 1995), pesticides (Celis et al, 2000;Inacio et al, 2001), lignite-derived humic acids (Seida and Nakano, 2000), or surfactants (dos Reis et al, 2004) has been studied intensively. Except for some studies on sorption of OM from upland surface and peat water (Amin and Jayson, 1996;Hussein et al, 2001), information on the adsorption of natural OM to hydrotalcite is scarce and non-detailed.…”