Biosorption of cadmium by biomass of brown marine macroalgae

Abstract

Five different brown seaweeds, Bifurcaria bifurcata, Saccorhiza polyschides, Ascophyllum nodosum, Laminaria ochroleuca and Pelvetia caniculata were studied for their ability to remove cadmium from aqueous solution. Kinetics of cadmium adsorption by all the algae were relatively fast, with 90% of total adsorption occurring in less than 1h. These experiments could be accurately described by a pseudo-second-order rate equation, obtaining values between 1.66x10(-3) and 9.92x10(-3) g/mgmin for the sorption rate constant k. Several equilibrium adsorption isotherms were obtained for the quantitative description of cadmium uptake. The use of the Langmuir isotherm led to values between 64 and 95 mg/g for qmax and between 0.036 and 0.094 L/mg for b. The effect of pH on biosorption was also studied. Acid-base properties of algae were studied by potentiometry to determine pK values (from 3.54 to 3.98) and the total number of acid groups.

Equilibrium modeling of mono and binary sorption of Cu(II) and Zn(II) onto chitosan gel beads

“…The Redlich-Peterson isotherm equation is given by (Repo et al, 2010): Koble-Corrigan equilibrium model is also a three-parameter empirical model which is also another combination of the Langmuir and Freundlich isotherm equations. Koble-Corrigan equilibrium model is given by (Han et al, 2005): Toth proposed an equilibrium model which is expressed in the following form (Lodeiro et al, 2005): (14)) and Toth (Eq. (15)) equilibrium models were fitted to the experimental data of Cu(II) and Zn(II) ions and results are shown in Table 2.…”

Removal of copper ions from aqueous solution using silica derived from rice straw: comparison with activated charcoal

“…Conventional techniques for removing dissolved heavy metals include chemical precipitation, carbon sorption, electrolytic recovery, ion-exchange, solvent extraction or liquid membrane separation (Vasuderan et al 2003;Gõksungur et al 2005;Júnior et al 2003;Lodeiro et al 2005;Liu et al 2006;Sharma et al 2006). These techniques are sometimes restricted because of technical or economic constraints as a result of high capital and operational cost.…”

Accumulation and release of Pb(II) in aqueous solution by aquatic mosses (Fontinalis antipyretica)

“…Processes suitable at high concentrations are often either ineffective or cost unreasonable when applied to metal dilute wastewaters (Lodeiro et al, 2005a). Biosorption is an emerging and attractive technology that uses biological materials to remove metals from solution through adsorption (Volesky, 2003;Norton et al, 2004).…”