Heavy Metal Binding and Removal by Phormidium

Wang, T. C.; Weissman, Joseph C.; Ramesh, G.; Varadarajan, R.; Benemann, John R.

doi:10.1007/s001289900688

Cited by 58 publications

(23 citation statements)

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“…Correlation coefficient (R2) obtained from Langmuir isotherms, was positive and highly significant. Other study (Wang et al, 1998) on the heavy metals binding and removal by Phormidium sp biomass reported the highly maximum adsorption, calculated from Langmuir isotherm, 13,600 mg/kg for Pb which was higher than that of our results. Ajmal et al (1995) found 100% maximium adsorption of Pb(II) on pyrolusite.…”

Section: Langmuir and Freundlich Adsorption Isothermcontrasting

confidence: 84%

“…After pH 8, Pb adsorption decrease as a result of precipitation of Pb as hydroxide. Other study on the adsorption of heavy metals on the biomass of Phormidium sp was suitable at pH 5 for Pb, Cu, Cd, Zn and Ni (Wang et al, 1998) in which the maximum adsorption was 13,600 mg/kg for Pb; 10,100 mg/kg for Cu; 9,600 mg/kg for Cd; 9,400 mg/kg for Zn and 5,700 mg/kg for Ni. Removal of 100% Pb by coipith carbon was observed at pH 4 (Kadirvelu et al, 2001).…”

Section: Effect Of Phmentioning

confidence: 99%

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Fruit Stones from Industrial Waste for the Removal of Lead Ions from Polluted Water

Rashed

2006

Environ Monit Assess

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Lead, one of the earliest metals recognized and used by humans, has a long history of beneficial use. However, it is now recognized as toxic and as posing a widespread threat to humans and wildlife. Treatment of lead from polluted water and wastewater has received a great deal of attention. Adsorption is one of the most common technologies for the treatment of lead-polluted water. This technique was evaluated here, with the goal of identifying innovative, low-cost adsorbent. This study presents experiments undertaken to determine the suitable conditions for the use of peach and apricot stones, produced from food industries as solid waste, as adsorbents for the removal of lead from aqueous solution. Chemical stability of adsorbents, effect of pH, adsorbents dose, adsorption time and equilibrium concentration were studied. The results reveal that adsorption of lead ions onto peach stone was stronger than onto apricot stone up to 3.36% at 3 h adsorption time. Suitable equilibrium time for the adsorption was 3-5 h (% Pb adsorption 93% for apricot and 97.64% for peach). The effective adsorption range for pH in the range was 7-8. Application of Langmuir and Freundlich isotherm models show high adsorption maximum and binding energies for using these adsorbents for the removal of lead ions from contaminated water and wastewater.

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Section: Langmuir and Freundlich Adsorption Isothermcontrasting

confidence: 84%

Section: Effect Of Phmentioning

confidence: 99%

Fruit Stones from Industrial Waste for the Removal of Lead Ions from Polluted Water

Rashed

2006

Environ Monit Assess

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“…Marine green microalgae Platymonas subcordiformis had a very high strontium uptake capacity; however high concentration of strontium causes oxidative damage (Mei et al 2006 ). The blue green alga Phormidium can successfully hyperaccumulate heavy metals like Cd, Zn, Pb, Ni, and Cu (Wang et al 1995 ). Caulerpa racemosa var.…”

Section: Algae In Phytoremediationmentioning

confidence: 99%

Phytoremediation Using Algae and Macrophytes: II

Jatav¹,

Singh²

2015

Phytoremediation

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“…Many strains have been isolated that sorb (14,23,51,59,61), reduce (10,18,52,56), and precipitate (4,33,41,44,45) metals, usually on the outer membrane of the cell. Sorption is generally achieved in a reversible process and is dependent on the composition of the water being treated, as other chelating agents compete with the complexing moieties on the cell.…”

mentioning

confidence: 99%

Uranyl Precipitation byPseudomonas aeruginosavia Controlled Polyphosphate Metabolism

Renninger¹,

Knopp²,

Nitsche

et al. 2004

Appl Environ Microbiol

108

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The polyphosphate kinase gene from Pseudomonas aeruginosa was overexpressed in its native host, resulting in the accumulation of 100 times the polyphosphate seen with control strains. Degradation of this polyphosphate was induced by carbon starvation conditions, resulting in phosphate release into the medium. The mechanism of polyphosphate degradation is not clearly understood, but it appears to be associated with glycogen degradation. Upon suspension of the cells in 1 mM uranyl nitrate, nearly all polyphosphate that had accumulated was degraded within 48 h, resulting in the removal of nearly 80% of the uranyl ion and >95% of lesser-concentrated solutions. Electron microscopy, energy-dispersive X-ray spectroscopy, and time-resolved laser-induced fluorescence spectroscopy (TRLFS) suggest that this removal was due to the precipitation of uranyl phosphate at the cell membrane. TRLFS also indicated that uranyl was initially sorbed to the cell as uranyl hydroxide and was then precipitated as uranyl phosphate as phosphate was released from the cell. Lethal doses of radiation did not halt phosphate secretion from polyphosphate-filled cells under carbon starvation conditions.Biological methods for the removal of heavy metals and actinides have recently been investigated due to their cost effectiveness at moderate metal concentrations. Many strains have been isolated that sorb (14,23,51,59,61), reduce (10, 18, 52, 56), and precipitate (4, 33, 41, 44, 45) metals, usually on the outer membrane of the cell. Sorption is generally achieved in a reversible process and is dependent on the composition of the water being treated, as other chelating agents compete with the complexing moieties on the cell. Thus, the applicability of this method in more complex waste streams or environments may be somewhat suspect due to the relatively low binding affinities of cellular components for metals compared to chelators, such as humic or organic acids. Reduction is generally limited to anaerobic processes and is ineffective against single-oxidationstate metals. Precipitation has the advantage of producing chemically stable forms of metal, and its use is not limited to reducible metals.With respect to the biological precipitation of metals, both metal sulfides (12,57,58,60) and metal phosphates (4, 33, 45) have been investigated due to their low solubilities. While some work has been done to produce sulfide aerobically (57), its production is generally an anaerobic process, limiting its applicability. The release of phosphate via the hydrolysis of an organic phosphate has been shown to be an effective method for the precipitation of metals on cell membranes. Macaskie and Dean (30) isolated a cadmium-resistant strain of Citrobacter that precipitated numerous metals, such as uranyl ion, as metal phosphates through the use of a membranebound acid phosphatase (26,31,32). Using glycerol-2-phosphate as a phosphate source, the organism cleaved phosphate from the source in the periplasmic space, leaving it to bind with metals that had been complexe...

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Heavy Metal Binding and Removal by Phormidium

Cited by 58 publications

References 1 publication

Fruit Stones from Industrial Waste for the Removal of Lead Ions from Polluted Water

Fruit Stones from Industrial Waste for the Removal of Lead Ions from Polluted Water

Phytoremediation Using Algae and Macrophytes: II

Uranyl Precipitation byPseudomonas aeruginosavia Controlled Polyphosphate Metabolism

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