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Global Journal of Environmental Science and Technology 2011, 1: 3
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Research Article
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Pseudomonas veronii 2E surface interactions with Zn(II) and Cd(II)
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Nerina Méndezb, Silvana A.M.Ramíreza, Helena M. Cerettia, Anita Zaltsa,Roberto Candal c,d and Diana L. Vulloa,b
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a Área Química, Instituto de Ciencias, Universidad Nacional de General Sarmiento, J.M. Gutiérrez 1150, B1613GSX, Los Polvorines, Buenos Aires, Argentina
b Área Microbiología, Depto. de Química Biológica, Facultad de Ciencias Exactas y Naturales (UBA), Pab. II, Piso 4, Ciudad Universitaria, (1428) Buenos Aires, Argentina
c INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales (UBA), Pabellón II, Ciudad Universitaria, (1428) Buenos Aires, Argentina.
d ECyT-UNSAM, Campus Miguelete, 25 de mayo y Francia, (1650) San Martín, Buenos Aires, Argentina
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Abstract |
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Biosorption can be implemented as an
immobilization technique for metal removal from wastewaters using either living
or non-living biomass. The aim of this work is to study the biosorption process
for Zn(II) and mixtures Zn(II)-Cd(II) by Pseudomonas veronii 2E, a
microorganism with proven adsorptive capacity for Cd(II). A 82% of total Zn(II)
biosorption was achieved in 30 hrs at 32ºC and the isotherm results suited the
Freundlich model. Cd(II) and Zn(II) simultaneous biosoption showed that all the
adsorption sites are available for
Cd(II), but only a fraction of them are for Zn(II). The electrophoretic
mobility (µ) experiments that were performed with either Zn(II) or
Cd(II)-Zn(II) mixtures supported these results. In addition, electrical
properties of bacterial surface were studied by isoelectric point determination
and µ variations examined at different growth states. Zn(II) and Cd(II)
biosorption capacity of Pseudomonas
veronii 2E makes possible its
application as an efficient biosorbent in wastewater treatments.
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Keywords |
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Pseudomonas veronii 2E; electrophoretic mobility; biosorption; Anodic Stripping Voltammetry
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