Novel thio-kaolinite nanohybrid materials and their application as heavy metal adsorbents in wastewater

摘要

A new clay nanohybrid adsorbent material was obtained by grafting the compound 3,6-dithia-1,8-octanediol (HO(CH2)(2)S(CH2)(2)S(CH2)(2)OH) onto the internal aluminol surfaces of both the urea- and dimethylsulfoxide (DMSO) precursors of two kaolinite clay minerals: the Source clay KGa-1b and a Portuguese clay sample collected from the Clays of Taveiro formation. All samples were characterised by X-ray diffraction and solid-state C-13 cross-polarisation nuclear magnetic resonance (CP-MAS NMR) spectroscopy. Initial materials and final products were also characterised by thermal gravimetric analysis (TGA) and Fourier-Transform infrared (FTIR) spectroscopy. The results describe nanohybrid materials that are resistant to hydrolysis and exhibit different grafting fashions.