Competitive adsorption of heavy metals by extracellular polymeric substances extracted from Klebsiella sp. J1

Yang, Jixian; Wei, Wei; Pi, Shanshan; Ma, Fang; Li, Ang; Wu, Dan; Xing, Jie

doi:10.1016/j.biortech.2015.08.011

Cited by 103 publications

(37 citation statements)

References 33 publications

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“…The greater proportion of copper ion removal over other metal ions by bacterial EPS was also demonstrated by Yang et al When both the ions were subjected to a binary system it was found that copper ions (1.77 mmol/g) was preferentially adsorbed over zinc ions (1.36 mmol/g) by Klebsiella sp. J1 EPS [106]. The reason behind this competitive adsorption behavior might be because the metal ion was presumably acting as complexation agent of protein or protein like substances for respective bacterial strains, as per Yang et al suggested [106].…”

Section: Different Strategies Of Eps Mediated Metal Ion Remediationmentioning

confidence: 97%

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Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Gupta

Diwan

2017

Biotechnology Reports

670

243

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HighlightsCatastrophe of heavy metal pollution in environment is discussed in terms of remediation through bacterial Exopolysaccharide.Biosynthesis of polymer, mechanism of action and metal remediation through polymer has been expounded deeply.Wide range of bacterial cells and their EPS in diverse forms have been critically analyzed.Challenges that still lie in the path of commercialization has been scrutinized.

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Section: Different Strategies Of Eps Mediated Metal Ion Remediationmentioning

confidence: 97%

“…J1 EPS [106]. The reason behind this competitive adsorption behavior might be because the metal ion was presumably acting as complexation agent of protein or protein like substances for respective bacterial strains, as per Yang et al suggested [106].…”

Section: Different Strategies Of Eps Mediated Metal Ion Remediationmentioning

confidence: 97%

Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Gupta

Diwan

2017

Biotechnology Reports

670

243

View full text Add to dashboard Cite

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“…Chemical analysis (Yang et al, ) revealed that the laEPS extracted from J1 was mainly composed of polysaccharides and proteins in a mass ratio of approximately 1:1.5. The DNA and lipid contents in the laEPS were only 4.5 and 0.2 wt%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…In this study, we examined U(VI) immobilization by the loosely associated EPS (laEPS) extracted from Klebsiella sp. J1 (hereafter called J1), which has been applied extensively as an efficient heavy‐metal biosorbent (Wei et al, , ; Yang et al, ), although it never was reported to reduce metals. We tracked short‐term U(VI) immobilization by the J1 EPS exposed either to O 2 or to H 2 , and we utilized various solid‐state characterization tools to verify U(VI) reduction reflected as a lower average oxidation state or altered forms of the immobilized product.…”

Section: Introductionmentioning

confidence: 99%

Direct solid‐state evidence of H₂‐induced partial U(VI) reduction concomitant with adsorption by extracellular polymeric substances (EPS)

Zhou

Liu

et al. 2018

Biotech & Bioengineering

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Adsorption of hexavalent uranium (U(VI)) by extracellular polymeric substances (EPS) has been studied, but the possibility of simultaneous U(VI) reduction mediated by EPS has not had experimental confirmation, as the reduction products have not yet been directly proven. Here, we reported the first direct evidence of lower-valent products of U(VI) immobilization by loosely associated EPS (laEPS) isolated from a fermenter strain of Klebsiella sp. J1 when the laEPS was exposed to H . During the 120-min tests for similarly 86% adsorption under O , N , and H , 8% more U was immobilized through a non-adsorptive pathway by the EPS for H than for N and O . A set of solid-state characterization tools (FT-IR, XPS, EELS, and TEM-EDX) confirmed partial reduction of U(VI) to lower-valence U, with the main reduced form being uraninite (U O ) nanoparticles, and the results reinforced the role of the reduction in accelerating U immobilization and shaping the characteristics of immobilized U in terms of valency, size, and crystallization. The laEPS, mostly comprised of carbohydrate and protein, contained non-cytochrome enzymes and electron carriers that could be responsible for electron transfer to U(VI). Taken together, our results directly confirm that EPS was able to mediate partial U(VI) reduction in the presence of H through non-cytochrome catalysis and that reduction enhanced overall U immobilization. Our study fills in some gaps of the microbe-mediated U cycle and will be useful to understand and control U removal in engineered reactors and in-situ bioremediation.

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“…Recently, the EPS from Kleb siella sp. J1 were reported and characterized . They exhibited superior reactivity with Pb(II) and Cd(II), owing to their higher protein content and more abundant functional groups .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous sorption and reduction of Cr(VI) in aquatic system by microbial extracellular polymeric substances from Klebsiella sp. J1

Wei

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND Cr(VI) is being increasingly used in a variety of fields, including electroplating, metallurgy, pigment synthesis and leather tanning. The possible application of a microbial extracellular polymeric substance (EPS) from Klebsiella sp. J1 with abundant functional groups in remediating Cr(VI) pollution in water system was demonstrated. RESULTS The maximum biosorption capacity of EPS for Cr(VI) was found to be 53.3 mg g−1 at an EPS dose of 1.5 g L−1, which was better than the majority of reported biosorbents. The adsorption of EPS for Cr(VI) was a spontaneous and endothermic process. The removal mechanism of Cr(VI) in aquatic environments was explored qualitatively and quantitatively by Zeta‐potential meter, X‐ray photoelectron spectrometer (XPS) as well as Fourier transform infrared spectrometer. The superior Cr(VI) removal performance was attributed mainly to Cr(VI) adsorption on EPS via chelation and ion‐exchange sorption, and the efficient reduction (82.3%) of Cr(VI) to Cr(III) by benzenoid amine (–NH–) on EPS, followed by generated Cr(III) immobilization on the surface of EPS via surface physical sorption and chelation, which might control the reaction rate of Cr(VI) removal process. CONCLUSION The removal of Cr(VI) by EPS from Klebsiella sp. J1 was attributed mainly to simultaneous sorption and reduction of Cr(VI) by EPS. The results demonstrated that EPS from Klebsiella sp. J1 has great potential in treating Cr(VI)‐contaminated water. © 2018 Society of Chemical Industry

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Competitive adsorption of heavy metals by extracellular polymeric substances extracted from Klebsiella sp. J1

Cited by 103 publications

References 33 publications

Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Direct solid‐state evidence of H₂‐induced partial U(VI) reduction concomitant with adsorption by extracellular polymeric substances (EPS)

Simultaneous sorption and reduction of Cr(VI) in aquatic system by microbial extracellular polymeric substances from Klebsiella sp. J1

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Competitive adsorption of heavy metals by extracellular polymeric substances extracted from Klebsiella sp. J1

Cited by 103 publications

References 33 publications

Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Bacterial Exopolysaccharide mediated heavy metal removal: A Review on biosynthesis, mechanism and remediation strategies

Direct solid‐state evidence of H2‐induced partial U(VI) reduction concomitant with adsorption by extracellular polymeric substances (EPS)

Simultaneous sorption and reduction of Cr(VI) in aquatic system by microbial extracellular polymeric substances from Klebsiella sp. J1

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Direct solid‐state evidence of H₂‐induced partial U(VI) reduction concomitant with adsorption by extracellular polymeric substances (EPS)