Separation of Hg(II) by foam fractionation in the acidic range: Effect of complexation

Moussavi, Mohsen; Javidnejad, Maryam

doi:10.1016/j.jhazmat.2006.10.008

Cited by 21 publications

(11 citation statements)

References 22 publications

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“…It is well-known that the dithiocarbamate (DTC) group has a strong affinity towards heavy metal cations and their chelates are remarkably stable in aqueous solutions [42][43][44][45][46][47][48][49][50][51]. Thus silica gel grafted with DTC groups have been used to extract Co 2+ [48,52], Hg 2+ [52][53][54][55], Cu 2+ [48,54] and Cd 2+ [48,54] from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Silica coated magnetite particles for magnetic removal of Hg2+ from water

Girginova

Daniel‐da‐Silva

Lopes

et al. 2010

Journal of Colloid and Interface Science

339

145

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Section: Introductionmentioning

confidence: 99%

Silica coated magnetite particles for magnetic removal of Hg2+ from water

Girginova

Daniel‐da‐Silva

Lopes

et al. 2010

Journal of Colloid and Interface Science

339

145

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“…By applying the stability constants recommended by the International Union of Pure and Applied Chemistry (IUPAC) for the reactions between Pb 2+ and the above-mentioned ligands [31] and the model presented in Equation 1, it was found that lead would appear in solution primarily as PbCl − 3 and PbCl + , and the total concentration of lead-containing species would be about two orders of magnitude more than the concentration predicted by Equation 1 (Figure 5). The concentration of lead complexes was estimated based on the technique formerly used for estimation of Hg complexes [32,33].…”

Section: Discussionmentioning

confidence: 99%

How to minimize iron loss while decontaminating converter dust from lead

Moussavi

Fathikalajahi

Khalili

2011

Environmental Technology

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The purpose of this work was to decontaminate a converter flue dust from lead while minimizing the iron loss from the dust matrix. A physicochemical method based on a leaching cascade was applied to remove lead impurities with HCl. Finally, the lead-rich wastes generated at the end of the operations were further treated in order to meet the standards of waste disposal sites. The results show that lead could be removed from the dust with efficiencies of better than 90%. However, some iron was lost in these operations. It was noticed that under optimum conditions 8.5 g of iron would be lost as leachate per each gram of removed lead. It was also noticed that the lead-treated dust was more concentrated in iron and had less calcium. A number of parameters that could affect the amount of iron loss, such as acid dose, exposure time and temperature, were identified and the extent of the effects are presented. It was concluded that the lead content in the flue dust could practically be lowered to any level. It was also concluded that the difference between the solubility of lead chloride in cold and hot water, as well as the affinity of certain ligands such as Cl- and OH- to form stable complexes with lead ions, played a key role in this study. The lead-containing complexes in the leachate were identified to be predominantly PbCl3- and PbCl+.

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“…This process is versatile and works better than the other techniques described, especially when the heavy metal concentration is low [20–22]. Foam fractionation methods for removal of heavy metals were also reported elsewhere [15,23,24]. This technique operates based on the fact that surface-active molecules tend to accumulate at the gas–liquid interface, and by bubbling air through the solution, the surface-active material is absorbed at the surface of the bubble and then separated from the solution.…”

Section: Introductionmentioning

confidence: 99%

Removal of Mercury by Foam Fractionation Using Surfactin, a Biosurfactant

Chen

Reddy

et al. 2011

IJMS

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The separation of mercury ions from artificially contaminated water by the foam fractionation process using a biosurfactant (surfactin) and chemical surfactants (SDS and Tween-80) was investigated in this study. Parameters such as surfactant and mercury concentration, pH, foam volume, and digestion time were varied and their effects on the efficiency of mercury removal were investigated. The recovery efficiency of mercury ions was highly sensitive to the concentration of the surfactant. The highest mercury ion recovery by surfactin was obtained using a surfactin concentration of 10 × CMC, while recovery using SDS required < 10 × CMC and Tween-80 >10 × CMC. However, the enrichment of mercury ions in the foam was superior with surfactin, the mercury enrichment value corresponding to the highest metal recovery (10.4%) by surfactin being 1.53. Dilute solutions (2-mg L−1 Hg2+) resulted in better separation (36.4%), while concentrated solutions (100 mg L−1) enabled only a 2.3% recovery using surfactin. An increase in the digestion time of the metal solution with surfactin yielded better separation as compared with a freshly-prepared solution, and an increase in the airflow rate increased bubble production, resulting in higher metal recovery but low enrichment. Basic solutions yielded higher mercury separation as compared with acidic solutions due to the precipitation of surfactin under acidic conditions.

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Separation of Hg(II) by foam fractionation in the acidic range: Effect of complexation

Cited by 21 publications

References 22 publications

Silica coated magnetite particles for magnetic removal of Hg2+ from water

Silica coated magnetite particles for magnetic removal of Hg2+ from water

How to minimize iron loss while decontaminating converter dust from lead

Removal of Mercury by Foam Fractionation Using Surfactin, a Biosurfactant

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