Resumo

ALE BORJA, Neptalí et al. Kinetic study of lead (II) biosorption on Ascophyllum nodosum seaweed. Rev. Soc. Quím. Perú [online]. 2015, vol.81, n.3, pp.212-223. ISSN 1810-634X.

Biosorption optimal pH and kinetics of lead (II) on Ascophyllum nodosum seaweed at 20°C were studied. In order to improve structural stability of alginate and avoid leaching, the biomass was pre-treated with CaCl₂. Biosorption kinetics experimental data showed grater coefficients of correlation (R²) on pseudo second order mathematic model. Physical chemistry parameters: particle size influence (75 µm - 180 µm and 0 µm - 75 µm) and biosorbent and metal concentrations in solution were evaluated in the biosorption kinetics. Pseudo second order constant, k₂ = 1.0x10^-4 g.mg^-1min^-1, of biosorbent with particle size 75-180 µm increased in 20% as particle size decreased to 0-75 µm, meanwhile, q2_e increased from 67,7 to 94,5 mg/g at the same conditions. Lead (II) residual concentrations in solution were determined by atomic absorption spectroscopy. For data processing and statistic treatment of non-linear regression, Origin 6.0 informatics program was used.

Palavras-chave : Biosorption; Ascophyllum nodosum; lead; kinetic; pseudo-first order; pseudo-second order.

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