Adsorption of Lead with Silica Gel Modified with Polyamidoamine Dendrimer and Thiomalic Acid

Abstract

Abstract.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 Pb 2+ 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 Pb 2+ with GFAAS was proposed. The relative standard deviation (R.S.D.) was 1.4% (n=11) for 0.2 μg mL -1 of Pb 2+. The limit of detection (LOD) of 2.9ng mL í1 was achieved. The proposed column enrichment method was applied for detection of Pb 2+ in tap water and sea water samples successfully.

Synthesis of KCC-1 Using Rice Husk Ash for Pb Removal from Aqueous Solution and Petrochemical Wastewater

“…The spent KCC-1 was analysed using FTIR spectroscopy and was compared with the fresh KCC-1 for identifying the functional groups Silica Gel 14.42 [35] Phenol-formaldehyde/silicon dioxide resin (PFSR) 13.74 [36] Mercapto-modified silica particles 10.42 [37] Anionic layered double hydroxide (LDH) 6.81 [38] that responsible for the adsorption process ( Figure 7). It was observed that the FTIR peaks of the synthesized KCC-1 (3423 cm -1 , 1058 cm -1 , 800 cm -1 , and 450 cm -1 ) were shifted after the adsorption process due to the electrostatic and chemical interaction of functional groups with metal ions [42].…”