Journal Article10.1080/02757540.2011.607439
Biosorption of lead and cadmium using marine algae
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TL;DR: The use of algae to reduce lead and cadmium levels from mono-metal solutions was investigated and infrared analysis showed that amino, hydroxyl and carboxyl functional groups provide the major biosorption sites for metal binding.
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Abstract: The use of algae (Ulva fasciata, green and Sargassum sp., brown) to reduce lead and cadmium levels from mono-metal solutions was investigated. The brown algae showed higher efficiency for the accumulation of lead (∼1.5 times) and cadmium (∼2 times) than green algae. The optimum pH value is found to be between 4 and 5.5. Regarding biomass concentration, an increase in metals percentage removal and a decrease in metal uptake capacity coincided with the increase in biomass concentration. All light metals (Ca, Mg and Na) showed a suppressive effect on biosorption capacity. The enhancement of biosorption in the case of NaOH was obvious. The biosorption process (65–90%) occurred within 3 min. Experimental data were in high agreement with the pseudo-second-order kinetic model and Freundlich model for lead and cadmium biosorption using different biosorbents. In the desorption study, 0.2 mol⋅L−1 HCl recorded the best concentration for the elution of metals from the biomass. The biosorption capacity decreased over ...
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