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Title: Modeling of Cd adsorption to goethite-bacteria composites

Journal Article · · Chemosphere
 [1];  [1];  [2];  [1];  [3];  [4]; ORCiD logo [1]
  1. Huazhong Agricultural Univ., Wuhan (China). State Key Lab. of Agricultural Microbiology, Key Lab. of Arable Land Conservation
  2. Huazhong Agricultural Univ., Wuhan (China). State Key Lab. of Agricultural Microbiology
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Earth and Biological Sciences Directorate
  4. Huazhong Agricultural Univ., Wuhan (China). Key Lab. of Arable Land Conservation

The accurate modeling of heavy metal adsorption in complex systems is fundamental for risk assessments in soils and associated environments. Bacteria-iron (hydr)oxide associations in soils and sediments play a critical role in heavy metal immobilization. The reduced adsorption of heavy metals on these composites have been widely reported using the component additivity (CA) method. However, there is a lack of a mechanism model to account for these deviations. In this study, we established models for Cd adsorption on goethite-Pseudomonas putida composites at 1:1 and 5:1 mass ratios. Cadmium adsorption on the 5:1 composite was consistent with the additivity method. But, the CA method over predicted Cd adsorption by approximately 8% on the 1:1 composite at high Cd concentration. The deviation was corrected by adding the site blockage reactions between P. putida and goethite. Both CA and “CA-site masking” models for Cd adsorption onto the composites were in line with the ITC data. These results indicate that CA method in simulating Cd adsorption on bacteria-iron oxides composites is limited to low bacterial and Cd concentrations. Thus the interfacial complexation reactions that occur between iron (hydr)oxides and bacteria should be taken into account when high concentrations of bacteria and heavy metals are present.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
41230854; 2662015PY016; 2662015PY116; AC0576RL01830
OSTI ID:
1413472
Report Number(s):
PNNL-SA-133692; PII: S0045653517318775
Journal Information:
Chemosphere, Vol. 193, Issue C; ISSN 0045-6535
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 24 works
Citation information provided by
Web of Science

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Cited By (3)

Distribution and mobility of exogenous copper as influenced by aging and components interactions in three Chinese soils journal February 2018
Perspectives of Microbial Inoculation for Sustainable Development and Environmental Management journal December 2018
Binding of Sb(III) by Sb-tolerant Bacillus cereus cell and cell-goethite composite: implications for Sb mobility and fate in soils and sediments journal February 2019

Figures / Tables (8)


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