J. Phys. IV France
Volume 107, May 2003
Page(s) 845 - 849

J. Phys. IV France
107 (2003) 845
DOI: 10.1051/jp4:20030430

Simultaneous bio-sorption of heavy metals by marine sea-weeds

P. Massacci, M. Ferrini and E. Migliavacca

Department of Chemical, Materials, Raw Materials and Metallurgical Engineering, University of Roma La Sapienza, via Eudossiana 18, 00184 Roma, Italy

The aim of this work is to investigate the heavy-metals uptake properties of a dried biomass coming from plant (green algae and leaves of marine macro-phytes) pick up on the shore of a polluted wetland Bio-sorption has been carried out taking into consideration a solution containing metal nitrates (10 mg/l of Cd, Zr, Pb, Cu and Ni + 1 mg/l of Hg in distilled water) with initial pH values between 5 and 9. Experimental results has shown that, in a batch system (solution/biomass = 1/1 in weight) fast metal sorption occurs. Total metal-uptake capacity of the biomass was of 0.54 mMol/g dry weight. Hg has been used as indicator of total metal uptake. After contact for 15 minutes ( $\rm pH = 5\div7$) about 70% of initial Hg bas been extracted. Regeneration of the biomass after sorption has been considered for refuse: a HCI solution has been adopted starting from different initial pH. It has been pointed out that regeneration by HCI leaching occurs in a proper and effective way at a pH value at least two points lower than that the sorption pH. Regenerating with HCI solution at pH = 2 allows de-sorption of more than 30% of sorbed metals.

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