Abstract
Abstract In order to develop a new type of adsorbent of toxic heavy metal ions, 2-aminoethanethiol-intercalated layered phosphates were synthesized. 2-Aminoethanethiol was intercalated into titanium(IV) dihydrogenphosphate phosphate dihydrate (γ -titanium phosphate), Ti(H2PO4)(PO4)·2H2O, with a monolayer structure. The intercalation compound could adsorb heavy metal ions, such as Ag+, Hg2+, Cd2+, Pb2+ and Cr3+, by interacting with a mercapto group (–SH). Also, it could completely adsorb Ag+ and Hg2+, even from any concentration of aqueous solutions. The adsorption amounts increased with an increase of the 2-aminoethanethiol content in the intercalation compound. The adsorption mechanism was investigated by using powder X-ray diffraction and solid-state NMR. For a comparison, propylamine-intercalated γ -titanium phosphate was also examined.
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