Biosorption Mechanism of Aqueous Pb2+ , Cd2+ , and Ni2+ Ions on Extracellular Polymeric Substances (EPS)

Archaea : an International Microbiological Journal
Di CuiAng Li

Abstract

Heavy metal pollution has been a focus with increasing attention, especially Pb2+, Cd2+, and Ni2+ in an aqueous environment. The adsorption capacity and mechanism of extracellular polymeric substances (EPS) from Agrobacterium tumefaciens F2 for three heavy metals were investigated in this study. The adsorption efficiency of 94.67%, 94.41%, and 77.95% were achieved for Pb2+, Cd2+, and Ni2+ adsorption on EPS, respectively. The experimental data of adsorption could be well fitted by Langmuir, Freundlich, Dubinin-Radushkevich isotherm models, and pseudo-second-order kinetic model. Model parameters analysis demonstrated the great adsorption efficiency of EPS, especially for Pb2+, and chemisorption was the rate-limiting step during the adsorption process. The functional groups of C=O of carboxyl and C-O-C from sugar derivatives in EPS played the major role in the adsorption process judged by FTIR. In addition, 3D-EEM spectra indicated that tyrosine also assisted EPS adsorption for three heavy metals. But EPS from strain F2 used the almost identical adsorption mechanism for three kinds of divalent ions of heavy metals, so the adsorption efficiency difference of Pb2+, Cd2+, and Ni2+ on EPS could be correlated to the inherent characteri...Continue Reading

References

Dec 4, 2004·Journal of Colloid and Interface Science·Ayhan DemirbasGulsin Arslan
May 10, 2005·Water Research·Konstantinos Athanasiadis, Brigitte Helmreich
May 6, 2009·Journal of Hazardous Materials·Qing ChangJinxi Wang
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May 13, 2014·Applied Microbiology and Biotechnology·Junyuan Guo, Jing Yu
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Sep 30, 2016·Environmental Science and Pollution Research International·Ang LiFang Ma
Aug 15, 2018·Environmental Science & Technology·Chun-Yu LaiLiang Zhu

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Citations

Jan 15, 2021·Brazilian Journal of Microbiology : [publication of the Brazilian Society for Microbiology]·Natália Franco TaketaniCláudia Duarte da Cunha
Dec 10, 2020·Archaea : an International Microbiological Journal·Jie XingHongwei Ni
May 8, 2021·Water Research·J Rajesh BanuGopalakrishnan Kumar
Feb 20, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Vahideh AfrazMohammad Rasoul Hadiani

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Methods Mentioned

BETA
infrared
fluorescence

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