Cited by 403Adsorption and biosorption for pollutant removalHeavy Metal Pollution RemediationAquatic Ecosystems and Phytoplankton Dynamics

Characterization of Metal−Cyanobacteria Sorption Reactions: A Combined Macroscopic and Infrared Spectroscopic Investigation

Yee, Nathan, Benning, Liane G., Phoenix, Vernon R., Ferris, F. Grant·2004·Environmental Science & Technology

Abstract

In this study, we conducted synchrotron radiation Fourier transform infrared (IR) spectroscopy, potentiometric titration, and metal sorption experiments to characterize metal-cyanobacteria sorption reactions. Infrared spectra were collected with samples in solution for intact cyanobacterial filaments and separated exopolymeric sheath material to examine the deprotonation reactions of cell surface functional groups. The infrared spectra of intact cells sequentially titrated from pH 3.2 to 6.5 display an increase in peak intensity and area at 1400 cm(-1) corresponding to vibrational COO- frequencies from the formation of deprotonated carboxyl surface sites. Similarly, bulk acid-base titration of cyanobacterial filaments and sheath material indicates that the concentration of proton-active surface sites is higher on the cell wall compared to the overlying sheath. A three-site model provides an excellent fit to the titration curves of both intact cells and sheath material with corresponding pKa values of 4.7 +/- 0.4, 6.6 +/- 0.2, 9.2 +/- 0.3 and 4.8 +/- 0.3, 6.5 +/- 0.1, 8.7 +/- 0.2, respectively. Finally, Cu2+, Cd2+, and Pb2+ sorption experiments were conducted as a function of pH, and a site-specific surface complexation model was used to describe the metal sorption data. The modeling indicates that metal ions are partitioned between the exopolymer sheath and cell wall and that the carboxyl groups on the cyanobacterial cell wall are the dominant sink for metals at near neutral pH. These results demonstrate that the cyanobacterial surfaces are complex structures which contain distinct surface layers, each with unique molecular functional groups and metal binding properties.

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Crossref · 10.1021/es0346680

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  • The sensitivity of off-line MIR measurements can elucidate molecular changes within an organism facilitated by metal sorption, which may be useful to understand the accumulation of metals of microalgae treating wastewaters.

    “The sensitivity of off-line MIR measurements can also elucidate molecular changes within an organism facilitated by metal sorption [58-60], which may be useful to understand the accumulation of metals of microalgae treating wastewaters.”

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Authors
Yee, N., Benning, L. G., Phoenix, V. R., & Ferris, F. G.
Affiliations
University of Leeds (GB)
Corresponding author
Yee, Nathan
Venue
Environmental Science & Technology
Published
2003-12-13
Volume
38
Issue
3
Pages
775-782
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W1972893759
Cited by
403
References
47
Citations by year
2026: 5 · 2025: 16 · 2024: 20 · 2023: 16 · 2022: 14 · 2021: 19 · 2020: 20 · 2019: 30 · 2018: 19 · 2017: 22 · 2016: 17 · 2015: 29 · 2014: 20 · 2013: 15 · 2012: 24
FWCI
8.63
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Science & Technology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Environmental Science › Water Science and Technology › Heavy Metal Pollution Remediation
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
Keywords
cyanobacteria, metal sorption, cell wall, carboxyl groups, deprotonation, acid-base titration, copper, cadmium, lead, pH dependence, metal ion binding, synchrotron infrared spectroscopy
MeSH terms
Adsorption, Cyanobacteria, Binding Sites, Hydrogen-Ion Concentration, Models, Theoretical, Polymers, Water Pollutants, Spectroscopy, Fourier Transform Infrared, Metals, Heavy

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