Functionalization of silica-gel with polyamidoamine and 2-mercaptobenzothiazole and its adsorption property for lead

摘要

Adsorbents PAMAM-n.0MBTSG (n=1-4) have been prepared by immobilizing polyamidoamine (PAMAM) and 2-mercaptobenzothiazole (MBT) on silica-gel. Characterized with FTIR, SEM, TGA, the preconcentration of Pb~(2+) with PAMAM-n.0MBTSG(n=1-4) has been investigated by graphite furnace atomic absorption spectroscopy (GFAAS). SEM showed that the surface morphology of adsorbent changed with the generation increase of PAMAM. Adsorption capacity of PAMAM-n.0MBTSG for Pb~(2+) (n=1-4) reached 16.22, 19.84, 22.92 and 27.56 mg g~(-1) respectively. Pb~(2+)((1.0 ng mL~(-1)) in 2000 mL solution could be quantitatively absorbed with PAMAM-4.0MBTSG and eluted to obtain a preconcentration factor (PF) of 200. GFAAS method for analysis of Pb~(2+) with PAMAM-4.0MBTSG as adsorbent was proposed and successfully applied to analysis of Pb~(2+) of standard reference material, sea water and squid sample.