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 Technoljournal_title
Bioresource technologyauthors
Fang L,Wei X,Cai P,Huang Q,Chen H,Liang W,Rong Xdoi
10.1016/j.biortech.2010.09.006subject
Has Abstractpub_date
2011-01-01 00:00:00pages
1137-41issue
2eissn
0960-8524issn
1873-2976pii
S0960-8524(10)01518-Xjournal_volume
102pub_type
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