[Analysis of the adsorption properties of lead ion onto natural sand particles by flame atomic absorption spectrometry].

The present research was aimed at the study of adsorption properties of lead ion on natural sand particle (NSP) by FAAS and at the development of NSP as an adsorbent used in the removal and preconcentration of lead(II) ion in aqueous solution by adsorption. Particle structure and size distribution, surface morphology, specific surface area, functional radical of NSP and adsorption properties of lead ion onto NSP and factors which affect the adsorption capacity were analyzed using FTIR, SEM, NSA and FAAS. The adsorption condition such as acidity of solution, flow rate and time etc were optimized. The 5.0 cm x 5 mm i. d. separation column was prepared by filling with the NSP as adsorbent. The experimental results showed that under the optimal adsorption conditions, such as the procedure was carried out at room temperature, pH of solution was 6, the flow rate was 2. 55 mL x min(-1), the maximum adsorption of Pb(II) onto NSP as adsorbent was 24. 9 mg x g(-1). Adsorption rate was 91.5%. Specific surface area and pore size were 7.60 m2 x g(-1) and 3.91 nm respectively. Using 0.10 mol x L(-1) chloride acid for desorption of Pb(II), the desorption rate reached 99%. At the same time the adsorption mechanism of Pb(II) was studied.