The Solid Phase Extraction of Some Heavy Metal Ions Using Dodecylamine Pillared Mg-Al Layered Double Hydroxides

Pillared host-guest material or layered double hydroxides (LDHs) of the type Mg-Al-CO3 with dodecylamine (DA) has been synthesized. The sorption capacities have been investigated for the removal of some heavy metal ions Ni(II), Cd(II), Co(II), Cu(II), Pb(II) and Cr(III) from natural water samples. The new LDHs compound Mg-Al-DA was characterized by fourier transform infrared spectroscopy (FT-IR), powder x-ray diffraction (PXRD) and scanning electron microscope (SEM). The analytical parameters such as pH, volume, the amount of sample and adsorption capacity for the quantitative recoveries of the ions using Mg-Al-DA was investigated. The effect of some common Interfering cations and anions that might be present in the water with the analyte on recovery was also examined. The recovery values of metal ions in natural water with relatively large sample volume of 100-1000 ml were greater than 95%. The determination of the heavy metal ions was carried out using atomic absorption spectroscopy.