The binding of heavy metals to algal surfaces

Xue, Hanbin; Stumm, Werner; Sigg, Laura

doi:10.1016/0043-1354(88)90029-2

Cited by 312 publications

(147 citation statements)

References 12 publications

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“…Several researches have investigated the effect of pH on biosorption of heavy metals using different kinds of microbial biomass and found that maximum biosorption occurred around neutral pH (Feng and Aldrich, 2004;Xue et al, 1988).…”

Section: Resultsmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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-Enterococcus faecium, a lactic acid bacterium (LAB), was evaluated for its ability to remove copper(II) ions from water. The effects of the pH, contact time, initial concentration of copper(II) ions, and temperature on the biosorption rate and capacity were studied. The initial concentrations of copper(II) ions used to determine the maximum amount of biosorbed copper(II) ions onto lyophilised lactic acid bacterium varied from 25 mg L -1 to 500 mg L -1 . Maximum biosorption capacities were attained at pH 5.0 and 6.0. Temperature variation between 20°C and 40°C did not affect the biosorption capacity of the bacterial biomass. The highest copper(II) ion removal capacity was 106.4 mg per g dry biomass. The correlation regression coefficients show that the biosorption process can be well defined by the Freundlich equation. The change in biosorption capacity with time was found to fit a pseudo-second-order equation.

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Section: Resultsmentioning

confidence: 99%

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Yılmaz

Tay

Kıvanç

et al. 2010

Braz. J. Chem. Eng.

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“…Enteromorpha, which is frequently used as an indicator species for heavy metal contamination, contained relatively great concentration of Cu (Rijstenbil et al, 1998a,b). The chelation removal of heavy metals from the cell surface after the binding of Cu with organic complexes (including cell exudates) is another possible mechanism for the detoxification of metal ions (Xue et al, 1988;Xue and Sigg, 1990;Rijstenbil et al, 1994;Gerringa et al, 1995).…”

Section: Bioconcentration Factor Of Cumentioning

confidence: 99%

“…Internal metal immobilization by the formation of copper bodies can also occur (Nassiri et al, 1997). Binding to organic complexes, especially cell exudates, is another possible mechanism regulating the detoxification of metal ions (Xue et al, 1988;Xue and Sigg, 1990;Rijstenbil et al, 1994;Gerringa et al, 1995). It has been reported that microalgal production of glutathione, thiols or superoxide dismutase activity (SOD) can be stimulated by copper, which may also be a defense mechanism against copper toxicity (Rijstenbil et al, 1994(Rijstenbil et al, , 1998aRijstenbil and Wijnholds, 1996;Okamoto and Colepicolo, 1998;Leal et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Toxicity and bioaccumulation of copper in three green microalgal species

2002

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The effective concentrations of copper on the inhibition of the growth of Scenedesmus obliquus, Chlorella pyrenoidosa and Closterium lunula at 96 h (96 h EC50) were determined to be 50, 68 and 200 lg/l, respectively. The low initial bioaccumulation of Cu by C. lunula was found to be responsible for its tolerance to Cu. The amount of Cu accumulated by all three microalgae reached the maximum value and decreased quickly after the peak followed by a slow decrease over the next 6 d. Bioaccumulation of Cu by C. lunula was directly proportional to the initial Cu concentration. After reaching the first peak after 1 d, the bioconcentration factor of Cu by microalgae declined to its minimum value during the exponential growth phase but increased in the stationary growth phase again. This indicates that desorption of Cu from microalgae was higher during the exponential growth phase but lower in the stationary growth phase. Smaller microalgae with low 96 h EC50 values are more efficient in removing Cu from wastewater.

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“…Similarly, internal distribution of metals as a result of competition for uptake sites within different organs has not been studied in detail. Knowledge about the possible mechanism of metal absorption has come mainly from studies involving algal cells (Crist et al, 1981;Xue et al, 1988). These researchers have demonstrated that functional groups on the surface of algae have been responsible for binding of metals like copper and cadmium (Xue et al, 1988) and that adsorbed metals can be exchanged with others of higher adsorption strength (Crist et al, 1981).…”

Section: Introductionmentioning

confidence: 99%

The absorption of metal ions byEichhornia crassipes

Nor

1990

Chemical Speciation & Bioavailability

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Uptake of metals by whole Eichhornia crassipes plants and excised roots was studied using a bioassay system. Results indicate that in time-series bioassay at concentration of 10 mg L-1 of either Zn or Cu, rapid uptake by whole plants occurred during the first 4 h, but subsequently levelled off after 48 h. A greater proportion of metals absorbed remain in the root system rather than being translocated to other parts of plant. When treated with different combinations of both Cu and Zn, some synergistic effect of metals appeared to have occurred as indicated by enhanced uptake when bioassays involved combination of metals. Absorption kinetics of monovalent K+ by excised Eichhornia roots after a 24-h treatment, indicated an initial linear trend over the range of 1-10 mg K L-1 , but subsequently levelled off at 15 mg K L-1 concentration with Vmax of 7.5 x 1 o-6 M K g-1 dry tissue h-1 and Km of 1.1 x 1 o-3 M K. Potentiometric titrations revealed existence of pH-dependent charge densities on root system which have variable affinities for cations and helps explain the ability of Eichhornia roots to absorb and accumulate large amounts of metal ions especially at high pH of media.

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The binding of heavy metals to algal surfaces

Cited by 312 publications

References 12 publications

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Removal of corper(II) Ions from aqueous solution by a lactic acid bacterium

Toxicity and bioaccumulation of copper in three green microalgal species

The absorption of metal ions byEichhornia crassipes

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