Role of extracellular polymeric substances in Cu(II) adsorption on Bacillus subtilis and Pseudomonas putida.

Abstract:

:The effect of extracellular polymeric substances (EPS) of Gram-positive Bacillus subtilis and Gram-negative Pseudomonas putida on Cu(II) adsorption was investigated using a combination of batch adsorption, potentiometric titrations, Fourier transform infrared spectroscopy. Both the potentiometric titrations and the Cu(II) adsorption experiments indicated that the presence of EPS in a biomass sample significantly enhance Cu(II) adsorption capacity. Surface complexation modeling showed that the pKa values for the three functional groups (carboxyl, phosphate and hydroxyl) were very similar for untreated and EPS-free cells, indicating no qualitative difference in composition. However, site concentrations on the untreated cell surface were found to be significantly higher than those on the EPS-free cell surface. Infrared analysis provided supporting evidence and demonstrated that carboxyl and phosphate groups are responsible for Cu(II) adsorption on the native and EPS-free cells.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Fang L,Wei X,Cai P,Huang Q,Chen H,Liang W,Rong X

doi

10.1016/j.biortech.2010.09.006

subject

Has Abstract

pub_date

2011-01-01 00:00:00

pages

1137-41

issue

2

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(10)01518-X

journal_volume

102

pub_type

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