Biosorption of heavy metals: Methodology example of uranium removal.
Advances in Biosorption of Heavy Metals.
It was concluded that biosorption show good performance for the removal of heavy metal. The effect of pH 4.0 to 5.0 of sample was found to be good. the experimental data points for biosorption of lead, cadmium, nickel and zinc. Lead, cadmium and nickel removal capacities of live biomass were higher than those of pretreated biomass obtained at pH 4.0 and 5.0, but lower at pH 6.0. HNO3 proved to be a more effective elutant than CaCl2 and NaCl, with more than 90% elution for Pb2+, Cd2+, Ni2+ and Zn2+, while deionized water exhibited negligible desorption capability.
Alginate properties and heavy metal biosorption by seaweed biomass.
The NaOH-pretreated M. rouxii biomass showed a high adsorption capability for the removal of lead, cadmium, nickel and zinc from aqueous solution. It exhibited good biosorption capacity in bi- or multi-metal ion systems in terms of total adsorption capability. pH was found to be critical in biosorption, with an optimum pH being 6.0 or higher (Brierley et al., 2009). High recovery of biosorbed metal ions could be achieved with acid elution. Caustic regeneration of eluted biomass rehabilitated the metal ion biosorption capacity of the biomass even after five cycles of reuse (Whistler and Daniel, 2005).