Cation exchange prediction model for copper binding onto raw brown marine macro-algae Ascophyllum nodosum: Batch and fixed-bed studies

摘要: Abstract The cation exchanger properties of brown marine macro-algae Ascophyllum nodosum for copper separation from aqueous solutions were studied in batch and continuous mode. total amount light metals present on the surface raw biomass was 2.4 mEq/g. converted different ionic forms achieving a similar binding capacity, indicating that conversion seaweeds to consists an ion exchange process. Carboxylic (≈1.3 mEq/g) sulphonic (≈1.1 mEq/g) groups identified as main functional responsible cations binding. Equilibrium kinetic experiments conducted at pH values using algae forms. Cation equilibrium model formulated mass action law being able determine selectivity coefficients between all species carboxylic groups. In fixed-bed column, four cycles saturation/elution/regeneration, operating capacity varied 0.6 0.8 mEq Cu2+/g, treating 27–33 L influent until breakthrough point 0.02 mEq Cu2+/L, corresponding service 301–367 BV. Higher elution efficiency observed 3.0% HCl counter-flow mode no damage after cycles. A transfer model, considering given by law, linear driving force intraparticle diffusion, predict well process during saturation steps chemical liquid solid phase. regeneration step successfully performed with CaCl2 0.1 M pH = 8.0 making possible reuse multiple