title: Biosorption of lead(II) and cadmium(II) by protonated Sargassum glaucescens biomass in a continuous packed bed column.
abstract: Biosorption of lead(II) and cadmium(II) from aqueous solutions by protonated Sargassum glaucescens biomass was studied in a continuous packed bed column. The selective uptake of Pb2+ and Cd2+ was investigated in a binary system with initial concentration of 1 mM for each metal ion. The selective uptake capacities of Pb2+ and Cd2+ at complete exhaustion point were obtained 1.18 and 0.22 mmol/g, respectively; therefore, the biosorbent showed much higher relative affinity for Pb2+ than for Cd2+. The optimum range of empty bed contact time (EBCT) was identified as 5-10 min in the packed bed column. The efficiency of biosorbent regeneration by 0.1 M HCl was achieved about 60%, so that the maximum uptake capacity of Pb2+ by the regenerated biomass was determined to be 0.75 mmol/g while the same value for the original biomass was 1.24 mmol/g. The Thomas model was found in a suitable fitness with the experimental data (R2 > 0.90 and % < 50%) at all different operation stages. Monitoring of pH in the effluent of the column presented the simultaneous release of H+ with the uptake of heavy metals; hence, ion exchange was confirmed to be one of the main biosorption mechanisms.
authors: Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, P.O. Box 14155-6446, Tehran, Iran.
authors: Kazem
authors: K
authors: Naddafi
authors: Ramin
authors: R
authors: Nabizadeh
authors: Reza
authors: R
authors: Saeedi
authors: Amir Hossein
authors: AH
authors: Mahvi
authors: Forough
authors: F
authors: Vaezi
authors: Kamyar
authors: K
authors: Yaghmaeian
authors: Azar
authors: A
authors: Ghasri
authors: Shahrokh
authors: S
authors: Nazmara
mesh_terms: D000042:Absorption; D018533:Biomass; D019149:Bioreactors; D002104:Cadmium / Q000737:chemistry / Q000378:metabolism*; D004338:Drug Combinations; D007854:Lead / Q000737:chemistry / Q000378:metabolism*; D009821:Oils / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D044647:Sargassum / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods; D014873:Water Pollutants / Q000737:chemistry / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D004338:Drug Combinations; D009821:Oils; C027222:P & S Liquid; D010636:Phenols; D014873:Water Pollutants; D002104:Cadmium; D007854:Lead