Sorption of heavy metals by prepared bacterial cell surfaces

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Environmental Engineering

DOI:https://doi.org/10.1061/(ASCE)0733-9372(1995)121:10(706)· OSTI ID:128830

Churchill, S A; Walters, J V; Churchill, P F ^[1]

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1. Univ. of Alabama, Tuscaloosa, AL (United States)

Prepared biomass from two Gram-negative and one Gram-positive bacterial strains was examined for single, binary, and quaternary mixtures of polyvalent metal cation binding to cell surfaces. The biosorption of {sub 24}Cr{sup 3+}, {sub 27}Co{sup 2+}, {sub 28}Ni{sup 2+}, and {sub 29}Cu{sup 2+} for each bacterial cell type was evaluated using a batch equilibrium method. The binding of each metal by all three bacterial cells could be described by the Freundlich sorption model. The isotherm binding constants suggest that E. coli cells are the most efficient at binding copper, chromium, and nickel; and M. luteus adsorbs cobalt most efficiently. The K-values for copper bound to P. aeruginosa and E. coli are > 2-fold and > 8-fold greater, respectively, than previous reported for intact cells. The general metal-affinity series observed was Cr{sup 3+} > Cu{sup 2+} > Ni{sup 2+} > Co{sup 2+}. There was a marked lower affinity of all biosorbents for Co{sup 2+} and Ni{sup 2+}. M. luteus and E. coli had a strong preference for Co{sup 2+} over Ni{sup 2+}. Metal-binding enhancement could be ascribed to increased cell barrier surface porosity to metal-bearing solutions.

• Sponsoring Organization: USDOE
• OSTI ID: 128830
• Journal Information: Journal of Environmental Engineering, Journal Name: Journal of Environmental Engineering Journal Issue: 10 Vol. 121; ISSN 0733-9372; ISSN JOEEDU
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ADSORPTION ISOTHERMS
AQUEOUS SOLUTIONS
CHROMIUM COMPOUNDS
COBALT COMPOUNDS
COPPER COMPOUNDS
ESCHERICHIA COLI
MICROCOCCUS
NICKEL COMPOUNDS
PSEUDOMONAS
SORPTION
SORPTIVE PROPERTIES
WATER POLLUTION