A comparative study for the sorption of Cd(II) by soils with different clay contents and mineralogy and the recovery of Cd(II) using rhamnolipid biosurfactant

Aşçı, Y.; Nurbas, Macid; Açıkel, Yeşim Sağ

doi:10.1016/j.jhazmat.2007.10.078

Cited by 66 publications

(17 citation statements)

References 40 publications

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“…The choice of using an anionic biosurfactant (rhamnolipids) is based on the results achieved by Aşçı et al [1] and Dermont et al [17] who shown that the use of an anionic surfactant gives better rate of metal removal.…”

Section: Influence Of the Pulp Phmentioning

confidence: 99%

“…The presence of low concentrations of heavy metals in the soils are known to have potential impact on environmental quality and human health via ground water, surface water, plants and agricultural products [1].…”

Section: Introductionmentioning

confidence: 99%

“…Cadmium (Cd) and zinc (Zn) have a great interest because of their high toxicity and mobility in soil and as metals in the contaminated sites are not degraded, they must be either immobilized or removed [1].…”

Section: Introductionmentioning

confidence: 99%

“…These surfactants have been studied in various environmental applications and are applied to the removal of Zn and Cd [1].…”

Section: Introductionmentioning

confidence: 99%

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Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

Bendaha

Meddah

Belaouni

et al. 2018

J. Fundam and Appl Sci.

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A soil treatment process using froth flotation technique involving anionic biosurfactant (rhamnolipids) using Sodium sulfide was studied. The supernatant produced by the strain Pseudomonas aeruginosa S7PS5 was tested for biosurfactants production, HPLC analysis showed the presence of L-rhamnosyl-β-hydroxydecanoyl-β-hydroxydecanoate (RL1) and L-rhamnosyl L-rhamnosyl-β-hydroxydecanoyl-β-hydroxydecanoate (RL2). The influence of the collector (rhamnolipid), pulp pH, a chemical activation step (sulfidization) and process time on metal removal efficiency has been investigated to recover Zn and Cd ions from a contaminated soil. An effective CMC of 35 mg/L was obtained. A perfect Zn and Cd removal efficiency was made at pH = 12 and 4 mg/g of Na 2 S during the first 5 min of soil washing process, then a longer flotation time ( > 5 min) caused mechanical entrainment of Zn and Cd. Keywords REMOVAL OF ZINC AND CADMIUM IONS FROM CONTAMINATED SOILS WITH RHAMNOLIPID BIOSURFACTANT PRODUCED BY PSEUDOMONAS AERUGINOSA S7PS5M. E-A. Bendaha

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Section: Influence Of the Pulp Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…These surfactants have been studied in various environmental applications and are applied to the removal of Zn and Cd [1].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

Bendaha

Meddah

Belaouni

et al. 2018

J. Fundam and Appl Sci.

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“…The possible areas of their application include, e.g., food production and protection, the pharmaceutical and cosmetic industry, agriculture, and natural environment protection [4,5]. Affinity of rhamnolipids to metals is studied mostly in a context of remediation of the soil contaminated with heavy metals [6,7,8,9]. However, some of divalent metals (e.g., Cu, Zn), which show toxicity to live organisms at high concentration, belong simultaneously to the microelements, which are necessary for proper functioning of these organisms.…”

Section: Introductionmentioning

confidence: 99%

An Interaction of Rhamnolipids with Cu2+ Ions

2018

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This study was focused on the description of interaction between Cu2+ ions and the 1:1 mono- and dirhamnolipid mixtures in the premicellar and aggregated state in water and 20 mM KCl solution at pH 5.5 and 6.0. The critical micelle concentration of biosurfactants was determined conductometrically and by the pH measurements. Hydrodynamic diameter and electrophoretic mobility were determined in micellar solutions using dynamic light scattering and laser Doppler electrophoresis, respectively. The copper immobilization by rhamnolipids, methylglycinediacetic acid (MGDA), and ethylenediaminetetraacetic acid (EDTA) was estimated potentiometrically for the Cu2+ to chelating agent molar ratio from 16:100 to 200:100. The degree of ion binding and the complex stability constant were calculated at a 1:1 metal to chelant molar ratio. The aggregates of rhamnolipids (diameter of 43–89 nm) were negatively charged. Biosurfactants revealed the best chelating activities in premicellar solutions. For all chelants studied the degree of metal binding decreased with the increasing concentration of the systems. The presence of K+ lowered Cu2+ binding by rhamnolipids, but did not modify the complex stability significantly. Immobilization of Cu2+ by biosurfactants did not cause such an increase of acidification as that observed in MGDA and EDTA solutions. Rhamnolipids, even in the aggregated form, can be an alternative for the classic chelating agents.

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Rhamnolipid–Metal Ions (Cr^VI and Pb^II) Complexes: Spectrophotometric, Conductometric, and Surface Tension Measurement Studies

Hari

Upadhyay

2020

J Surfact & Detergents

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The formation of rhamnolipid complexes with metal ions of chromium (VI) and lead (II) has been studied spectrophotometrically, conductometrically, and by surface tension measurement. The values of the critical micelle concentration (CMC) of rhamnolipid, obtained by spectroscopic, conductometric, and surface tension measurements, were 5.2 × 105, 5.0 × 105, and 5.3 × 105 mol.dm−3, respectively, which are in close agreement. An increase in CMC on increasing metal ion content in the rhamnolipid solution and a shift in λmax in the spectra of rhamnolipid indicated the formation of a complex between rhamnolipid and both the metal ions, namely, chromium (VI) and lead (II). The values of stability constants for the {rhamnolipid–chromium (VI)} and {rhamnolipid–lead (II)} complexes have been determined by spectroscopic data and were as 0.58 × 104 and 0.50 × 104 at 308 K, respectively. The thermodynamic parameters for micellization, namely, free energy change (∆Gmic), entropy change (∆Smic), and heat enthalpy change (∆Hmic), have been determined by conductivity measurements. An increase in the negative value of ∆Gmic and a decrease in the value of ∆Smicon increasing metal ion content in the surfactant solution indicated lower micellization of rhamnolipid in the presence of metal ions. The electrostatic attractions and entrapment of chromium (VI) in the micelles of the biosurfactants were found to be responsible for {rhamnolipid–lead (II)} and {rhamnolipid–chromium (VI)} complexes, respectively.

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A comparative study for the sorption of Cd(II) by soils with different clay contents and mineralogy and the recovery of Cd(II) using rhamnolipid biosurfactant

Cited by 66 publications

References 40 publications

Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

An Interaction of Rhamnolipids with Cu2+ Ions

Rhamnolipid–Metal Ions (Cr^VI and Pb^II) Complexes: Spectrophotometric, Conductometric, and Surface Tension Measurement Studies

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A comparative study for the sorption of Cd(II) by soils with different clay contents and mineralogy and the recovery of Cd(II) using rhamnolipid biosurfactant

Cited by 66 publications

References 40 publications

Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

Removal of zinc and cadmium ions from contaminated soils with rhamnolipid biosurfactant produced by <i>Pseudomonas aeruginosa</i> S7PS5

An Interaction of Rhamnolipids with Cu2+ Ions

Rhamnolipid–Metal Ions (CrVI and PbII) Complexes: Spectrophotometric, Conductometric, and Surface Tension Measurement Studies

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Product

Resources

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Rhamnolipid–Metal Ions (Cr^VI and Pb^II) Complexes: Spectrophotometric, Conductometric, and Surface Tension Measurement Studies