Studies on hexavalent chromium biosorption by chemically-treated biomass of Ecklonia sp.

Park, Donghee; Yun, Yeoung‐Sang; Park, Jong

doi:10.1016/j.chemosphere.2005.02.020

Cited by 362 publications

(268 citation statements)

References 14 publications

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“…However, it is essential to point out that Cr(VI) may first be bound to the positively charged complexing groups on fungal surface and then reduced to Cr(III) by adjacent electron-donor compounds (such as glutathione, cysteine, amino acids, etc.). 51 This occurs especially under acidic conditions because low pH can make the biomass surface more positive. Therefore, the Cr(VI) adsorption may preferably occur on the surface of inactivated AM fungi, as they maintained an acid condition (the pH was 5.3−5.4) ( Table S1).…”

Section: Environmental Science and Technologymentioning

confidence: 99%

“…46 Because DNP inhibited active Cr(VI) uptake by inhibiting the respiration process, 40 the Cr(III) adsorbed on the fungal surface indicated that Cr(VI) reduction likely occur on the fungal surface or in the hyphosphere and adsorbed on fungal surface. 51,56,57 Besides, considering the fact that a small proportion of Cr (about 26.4%) was transported to mycorrhizal roots via living ERM ( Figure S3), and that the root Cr concentration decreased when the ERM in hyphal compartment was inactivated by formaldehyde or DNP (Figure 2), we Figure 3B show irregular structures on the fungal surface, and the red arrows in Figure 3c show the presence of the Cr k α (5.41 keV) and Cr k β (5.95 keV) peaks. predict that the living hyphae may also absorb a small proportion of Cr either in the form of Cr(VI) [through the sulfate transporter; 58 once Cr(VI) is taken up, it will be reduced to Cr(III) immediately in the fungi by enzymes or biochemical groups] or Cr(III) (through the iron uptake system 59 ), and Cr(III) is then transported to mycorrhizal roots.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

“…Similar to our previous assumption, Cr(VI) may be reduced by certain enzymes 54 or specific biochemical groups (electron donors, e.g., glutathione, carboxyl, and amino groups). 51 The high Cr(VI) reduction capability of inactivated hyphae demonstrates that Cr(VI) reduction can be a nonmetabolic process, 55 possibly resulting from dissolved organic carbons derived from the AMF. 46 Because DNP inhibited active Cr(VI) uptake by inhibiting the respiration process, 40 the Cr(III) adsorbed on the fungal surface indicated that Cr(VI) reduction likely occur on the fungal surface or in the hyphosphere and adsorbed on fungal surface.…”

Section: Environmental Science and Technologymentioning

confidence: 99%

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Transformation and Immobilization of Chromium by Arbuscular Mycorrhizal Fungi as Revealed by SEM–EDS, TEM–EDS, and XAFS

Xin²,

Sun

et al. 2015

Environ. Sci. Technol.

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Arbuscular mycorrhizal fungi (AMF), ubiquitous soil fungi that form symbiotic relationships with the majority of terrestrial plants, are known to play an important role in plant tolerance to chromium (Cr) contamination. However, the underlying mechanisms, especially the direct influences of AMF on the translocation and transformation of Cr in the soil−plant continuum, are still unresolved. In a two-compartment root-organ cultivation system, the extraradical mycelium (ERM) of mycorrhizal roots was treated with 0.05 mmol L −1 Cr(VI) for 12 days to investigate the uptake, translocation, and transformation of Cr(VI) by AMF using inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy equipped with energy-dispersive spectroscopy (SEM−EDS), transmission electron microscopy equipped with energy-dispersive spectroscopy (TEM−EDS), and X-ray-absorption fine structure (XAFS) technologies. The results indicated that AMF can immobilize quantities of Cr via reduction of Cr(VI) to Cr(III), forming Cr(III)−phosphate analogues, likely on the fungal surface. Besides this, we also confirmed that the extraradical mycelium (ERM) can actively take up Cr [either in the form of Cr(VI) or Cr(III)] and transport Cr [potentially in the form of Cr(III)-histidine analogues] to mycorrhizal roots but immobilize most of the Cr(III) in the fungal structures. Based on an X-ray absorption nearedge spectroscopy analysis of Cr(VI)-treated roots, we proposed that the intraradical fungal structures can also immobilize Cr within mycorrhizal roots. Our findings confirmed the immobilization of Cr by AMF, which plays an essential role in the Cr(VI) tolerance of AM symbioses.

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Section: Environmental Science and Technologymentioning

confidence: 99%

Section: Environmental Science and Technologymentioning

confidence: 99%

Section: Environmental Science and Technologymentioning

confidence: 99%

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Transformation and Immobilization of Chromium by Arbuscular Mycorrhizal Fungi as Revealed by SEM–EDS, TEM–EDS, and XAFS

Xin²,

Sun

et al. 2015

Environ. Sci. Technol.

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“…Hence, the maximum chromium removal was observed at lower pH i.e., 2. Higher removal of chromium at low pH may also be due to the reduction of chromium (VI) to chromium (III) [18,19], which was then adsorbed by the adsorbent.…”

Section: Effect Of Ph On Cr(vi) Adsorptionmentioning

confidence: 99%

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Moniruzzaman¹,

Rahman²,

Aktar³

et al. 2017

Int J Waste Resour

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“…Cr(VI) is one of the most stable oxidation states, the others being chromium(II) and chromium(III). Cr(VI) can be reduced to Cr(III) by the biomass through two different mechanisms [24]. The "uptake-reduction" model for Chromium(VI) carcinogenicity is that tetrahedral chromate is actively transported across the cell membrane.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

Gelagutashvili¹

2013

OJMetal

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Biosorption of Cd(II), Ag(I) and Au(III) by cyanobacteria Spirulina platensis, of Au(II)-by Streptomyces spp. 19H, and of Cr(VI) and Cr(III)-by Arthrobacter species was studied by using the dialysis and atomic absorption analysis under various conditions. In particular, the impact of the following parameters on biosorption was studied: pH (for Ag, Cd, Au), living and non-living cells (for Cr), heavy metal valence (for Cr), homogenized and non-homogenized cells (for Au), Zn(II) ions (on Cr(VI)-Arthrobacter species). It was shown that biosorption efficiency of Cr(III), Cr(VI), Cd(II), Au(III) and Ag(I) ions is likely to depend on the type of bacteria used as well as on the conditions under which the uptake processes proceeded. It was shown that metal removal by microorganisms was influenced by physicalchemical parameters. The pH value of 7.0 was optimum for the removal of Ag(I) and Cd(II) by Spirulina platensis. At a low pH value of 5.5, Au (III) was by test algae more efficiently than Cd(II) and Ag(I).

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Studies on hexavalent chromium biosorption by chemically-treated biomass of Ecklonia sp.

Cited by 362 publications

References 14 publications

Transformation and Immobilization of Chromium by Arbuscular Mycorrhizal Fungi as Revealed by SEM–EDS, TEM–EDS, and XAFS

Transformation and Immobilization of Chromium by Arbuscular Mycorrhizal Fungi as Revealed by SEM–EDS, TEM–EDS, and XAFS

Equilibrium and Kinetic Parameters Determination of Cr(VI) Adsorption by Hogla Leaves (Typha elephantina Roxb.)

Comparative Study on Heavy Metals Biosorption by Different Types of Bacteria

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