Adsorption of Lead with Silica Gel Modified with Polyamidoamine Dendrimer and Thiomalic Acid
Department of Chemistry and Biological Engineering, Guilin University of Technology, Guilin 541004, China
New adsorbents PAMAM-n.0TMSG (n=1,2,3,4) with thiomalic acid as functional group has been prepared based on polyamidoamine dendrimer modified silica gel and characterized with FTIR, SEM and TG. Microcolumn enrichment and measurement of Pb2+ with graphite furnace atomic absorption spectroscopy (GFAAS) was investigated with PAMAM-n.0TMSG (n=1,2,3,4) as adsorbent. The adsorption conditions were optimized. The increase of grafted generation of PAMAM-n.0TMSG could effectively improved the adsorption performance of adsorbents. The adsorption capacity of adsorbents was 14.42, 16.19, 20.79 and 25.32 mg g-1 respectively, With PAMAM-4.0TMSG as adsorbent, microcolumn enrichment and measurement of Pb2+ with GFAAS was proposed. The relative standard deviation (R.S.D.) was 1.4% (n=11) for 0.2 μg mL-1 of Pb2+. The limit of detection (LOD) of 2.9ng mL−1 was achieved. The proposed column enrichment method was applied for detection of Pb2+ in tap water and sea water samples successfully.
© The Authors, published by EDP Sciences, 2016
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