Journal
SUSTAINABLE ENVIRONMENT RESEARCH
Volume 28, Issue 5, Pages 206-213Publisher
BMC
DOI: 10.1016/j.serj.2018.04.002
Keywords
Biosorption; Chromium; Escherichia coli; Kaolin; Staphylococcus epidermidis; Zinc
Categories
Funding
- Taiwan Ministry of Science and Technology [MOST 105-2221-E-041-002-MY3, MOST 104-2221-E-041-002]
- National Research Foundation of Korea through Ministry of Education [2016R1A6A1A03012812]
- National Research Foundation of Korea [2016R1A6A1A03012812] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, the capacity of Escherichia coli and Staphylococcus epidermidis biofilms supported on kaolin in the removal of Cr(VI) and Zn(II) from aqueous solution was investigated in batch assays. The effect of initial metal concentration and contact time on the removal efficiency of Cr(VI) and Zn(II) using E. coli and S. epidermidis biofilms supported on kaolin. Isotherm studies show that the Freundlich isotherm best describes the Zn(II) biosorption by E. coli and S. epidermidis biofilms and Cr(VI) biosorption onto S. epidermidis biofilm, and Langmuir isotherm for Cr(VI) biosorption by E. coli biofilm supported on kaolin. The kinetics of Cr(VI) and Zn(II) best fits the pseudo-second order kinetic model (R-2 > 0.98), which implies that chemisorption is the rate-limiting step. The adsorptive capacity of Gram-negative E. coli is higher than the Gram-positive S. epidermidis in the removal of Cr(VI) and Zn(II) from aqueous solution. (C) 2018 Chinese Institute of Environmental Engineering, Taiwan. Production and hosting by Elsevier B.V.
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