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Tellurite Adsorption onto Bacterial Surfaces

Journal Article · · Environmental Science and Technology
 [1];  [2];  [3];  [4];  [5];  [4];  [6]
  1. Rutgers Univ., Piscataway, NJ (United States)
  2. Rutgers Univ., New Brunswick, NJ (United States)
  3. Bulgarian Academy of Sciences, Sofia (Bulgaria); Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Univ. of Notre Dame, IN (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. Rutgers Univ., Piscataway, NJ (United States); Rutgers Univ., New Brunswick, NJ (United States)
Tellurium (Te) is an emerging contaminant and its chemical transformation in the environment is strongly influenced by microbial processes. In this study, we investigated the adsorption of tellurite [Te(IV), TeO32-] onto the common soil bacterium Bacillus subtilis. Thiol-blocking experiments were carried out to investigate the role of cell surface sulfhydryl sites in tellurite binding, and extended X-ray absorption fine structure (EXAFS) spectroscopy was performed to determine the chemical speciation of the adsorbed tellurite. The results indicate that tellurite reacts with sulfhydryl functional groups in the extracellular polymeric substances (EPS) produced by B. subtilis. Upon binding to sulfhydryl sites in the EPS, the Te changes from Te-O bonds to Te-S coordination. Further analysis of the surface-associated molecules shows that the EPS of B. subtilis contain proteins. Removal of the proteinaceous EPS dramatically decreases tellurite adsorption and the sulfhydryl surface site concentration. These findings indicate that sulfhydryl binding in EPS plays a key role in tellurite adsorption on bacterial surfaces.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1844541
Journal Information:
Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 15 Vol. 55; ISSN 0013-936X
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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