Journal
JOURNAL OF APPLIED PHYCOLOGY
Volume 26, Issue 3, Pages 1331-1342Publisher
SPRINGER
DOI: 10.1007/s10811-013-0145-x
Keywords
Adsorption isotherms; FTIR spectra; Heavy metals; Nostoc muscorum; Uptake kinetics
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The present study relates to the use of cyanobacterium Nostoc muscorum as a model system for removal of heavy metals such as Pb and Cd from aquatic systems. The effects of various physicochemical factors on the surface binding and intracellular uptake of Pb and Cd were studied to optimize the metal removal efficiency of the living cells of N. muscorum. Results demonstrated that a significant proportion of Pb and Cd removal was mediated by surface binding of metals (85 % Pb and 79 % Cd), rather than by intracellular accumulation (5 % Pb and 4 % Cd) at the optimum level of cyanobacterial biomass (2.8 g L-1), metal concentration (80 mu g mL(-1)), pH (pH 5.0-6.0), time (15-30 min), and temperature (30-40 A degrees C). N. muscorum has maximum amounts of metal removal (q (max)) capacity of 833 and 666.7 mg g(-1) protein for Pb and Cd, respectively. The kinetic parameters of metal binding revealed that adsorption of Pb and Cd by N. muscorum followed pseudo-second-order kinetics, and the adsorption behavior was better explained by both Langmuir and Freundlich isotherm models. The surface binding of both the metals was apparently facilitated by the carboxylic, hydroxyl, and amino groups as evident from Fourier transform infrared spectra.
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