Selective recovery of mercury(II) from industrial wastewaters I. Use of a chelating ion exchanger regenerated with brine

Becker, Natana; Eldridge, R. J.

doi:10.1016/0923-1137(93)90049-l

Cited by 22 publications

(4 citation statements)

References 9 publications

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“…Voluminous literature on mass transfer reactions involving mercury species at solid/liquid interfaces has appeared ( − ). Most studies required speciation analysis, if possible on both solid and solution phases, by often costly and time-consuming analytical methods.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Recognition of Selective Mercury Adsorption on Minerals

Walcarius

Devoy

Bessière

1999

Environ. Sci. Technol.

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Mercury species are highly toxic contaminants of the environment, and their dissemination in aquatic media is governed by sorption processes on both organic (including biological) and inorganic particles. An electrochemical method is provided for the direct monitoring of the selective binding of inorganic mercury(II) to the surface hydroxyl groups of some minerals (silica, goethite, pyrite) by using carbon paste electrodes modified by these mineral particles. After accumulation from aqueous solutions at open circuit, anodic stripping voltammetry was performed with the electrode immersed in a detection cell containing typically 0.2 M HNO 3 in order to desorb and measure the amount of previously adsorbed mercury. Several experimental parameters were optimized with a silica-modified electrode to ensure quantitative and reproducible results, including the electrode composition, the accumulation time, and the voltammetric detection mode. Mercury adsorption was studied as a function of pH and chloride concentration. It was found that only the soluble mercury-(II) species with hydroxyl moieties (HgOH + , Hg(OH) 2 , HgOHCl) were able to adsorb on these minerals by reacting with their surface hydroxyl groups. Moreover, in a rather low pH region (4-7), this reaction was extremely selective for mercury over other soluble metal species. The electrochemical monitoring, though mainly controlled by kinetics, gave significant insight in the adsorption processes as far as equilibrium states were rapidly reached.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Recognition of Selective Mercury Adsorption on Minerals

Walcarius

Devoy

Bessière

1999

Environ. Sci. Technol.

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“…This is exemplified by the electrochemical monitoring of the highly selective mercury(II) binding on the silica surface. The choice of mercury is supported by the still actual contamination of the environment by this element, which has led to remarkable efforts toward finding selective adsorbents for wastewater treatment, 3d, and/or developing analytical methods for this metal . No regeneration of the electrode surface was required allowing multiple successive analyses.…”

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confidence: 99%

Electrochemistry with Mesoporous Silica: Selective Mercury(II) Binding

and

Bessière

1999

Chem. Mater.

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The adsorption properties of mesoporous materials belonging to the MCM-41 family can be advantageously coupled to a selected electron-transfer reaction after their incorporation into a conductive composite matrix. This has been demonstrated via the voltammetric monitoring of the selective mercury(II) binding to pure silica MCM-41. The intrinsically simple methodology could be useful to the rapid characterization of the binding properties of other ordered mesoporous solids.

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“…Although, mercury-thiol interaction is highly selective towards many metal ions, the selectivity is greatly reduced in the presence of some heavy metal ions as Pb 2+ and Cd 2+ [11].…”

Section: Introductionmentioning

confidence: 99%