A fortunate marine algae biomass, Sargassum cinereum for removal of Pb(Ⅱ): Studies on thermodynamics, kinetics and characterization

摘要

The present study investigated to examine the biosorption capacity of a new biosorbent Sargassum cinereum (macroalgae) biomass for removal of Pb(II) from aqueous solution against pH, initial Pb(II) concentration, biomass weight and temperature. The data was well fitted by Freundlich and Langmuir isotherm models and Freundlich with a R-2 of 0.999. The kinetics study revealed that the following pseudo-second-order with R-2 of 0.995 on Pb(II), sorption capacity (q(e)) was 15.384 +/- 0.34 mg of Pb(II) per g of biomass and maximum efficiency (q(max)) was 21.6 mg/g. The biosorption process is exothermic (-Delta H degrees), feasible and spontaneous nature (-Delta G degrees). The SEM images revealed that the Pb(II) sorption on biomass S. cinereum as asymmetrical spikes. The functional groups, i.e. -OH, CO-, -NH stretching -CH, C-O, Si-C and -CH3 were specifically implicated in the progression of biosorption. S. cinereum (SC) biomass could be regenerated for 3 cycles with 20% loss in its initial biosorption capacity.