Abstract
Naturally occurring smectite clays have been expanded by a surfactant (cetyltrimethylammonium) and a cosurfactant (dodecylamine), which were then used in combination with the sol−gel process to prepare porous clay heterostructures (PCHs). A variety of thiol-functionalized PCHs have been obtained in one step by surfactant-directed co-condensation of tetraethoxysilane (TEOS) and 3-mercaptopropyltrimethoxysilane (MPTMS) in various molar ratios (ranging from 0 to 35% MPTMS) in the interlayer region of the clay. These materials have been characterized by several physicochemical techniques. They featured large specific surface areas and pore volumes (after template removal), due to the presence of regular mesopore channels between the clay sheets, but the mesostructural order and porosity were found to decrease upon rising the functionalization level. Hg(II) binding to these materials was then analyzed to get insight in the accessibility to the active centers and to characterize mass transfer rates to the bindi...
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