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Abstract: Molecular imprinting functional mesoporous silica was prepared by using lead ion as a template and 2-mercaptobenzothiazole as a modification agent. The material was characterized by scanning electron microscopy (SEM) and FT-IR. It was found that the functional material had selective affinity for lead ions, it could be easily separated from Cu(II), Cd(II) and Hg(II) and its maximum capacity was 0.64 mmol/g. When it was made into minicolumn to preconcentrate trace amount of lead ions in water, the saturated column could be eluted by 2 mL of EDTA (0.5 mol/L) and the preconcentration factor was 250. After preconcentration, the linear range of FAAS for Pb(II) was 0.5 ~ 1.2 x 10^4 μg/L with a correlation coefficient of 0.9992 and the detection limit (3σ, n=11) was 0.04 μg/L. The molecular imprinting functional mesoporous silica was utilized to preconcentrate trace amount of lead ions in river,the relative standard deviation (RSD) of FAAS for six replicate analyses was better than 3%, and the recoveries were between 98.2% and 99.1%. The results are satisfactory.
Template and target information: lead ion, Pb(II)
Author keywords: molecular imprinting technique, 2-Mercaptobenzothiazole, Adsorption of heavy metal ion, Flame atomic absorption spectroscopy, lead