Removal of aqueous arsenic using iron attached to immobilized ligands (IMLIGs)

Martin, Dean F.; O’Donnell, Lauren; Martin, Barbara B.; Alldredge, Robert

doi:10.1080/10934520601015875

Cited by 19 publications

(8 citation statements)

References 11 publications

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“…A 10 wt.% aluminum-impregnated sample (designated to Al 10 SBA-15) had 1.9-2.7 times greater arsenate adsorption capacities over a wide range of initial arsenate concentrations and a 15 times greater initial sorption rate at pH 7 Fe(III)-Octolig-21 composite was prepared from dried Octolig-21 and used for arsenic remediation [300]. Octolig-21 is an immobilized ligand containing (polyethyleneamino) groups bound to a silane that is covalently bound to silica gel.…”

Section: Metal-chelated Ligandsmentioning

confidence: 99%

Arsenic removal from water/wastewater using adsorbents—A critical review

Mohan

Pittman

2007

Journal of Hazardous Materials

3,135

1,445

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Section: Metal-chelated Ligandsmentioning

confidence: 99%

Arsenic removal from water/wastewater using adsorbents—A critical review

Mohan

Pittman

2007

Journal of Hazardous Materials

3,135

1,445

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“…The high value of the heat of adsorption indicated that the mechanism of arsenic sorption was chemisorption. Martin et al (2007) have described the synthesis of the iron(III) salt of a commercially available immobilized ligand, IMLIG, Octolig-21 and its use to remove arsenic from aqueous solutions. The synthesis was accomplished by treating an aqueous suspension of Octolig-21 with an equal weight of ferrous sulfate heptahydrate under nitrogen.…”

Section: Iron Based Sorbents (Ibs)mentioning

confidence: 99%

Technological options for the removal of arsenic with special reference to South East Asia

Jain¹,

Singh

2012

Journal of Environmental Management

143

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Arsenic contamination in ground water, used for drinking purpose, has been envisaged as a problem of global concern. However, arsenic contamination of ground water in parts of South East Asia is assuming greater proportions and posing a serious threat to the health of millions of people. A variety of treatment technologies based on oxidation, co-precipitation, adsorption, ion exchange and membrane process are available for the removal of arsenic from ground water. However, question remains regarding the efficiency and applicability/appropriateness of the technologies, particularly because of low influent arsenic concentration and differences in source water composition. Some of these methods are quite simple, but the disadvantage associated with them is that they produce large amounts of toxic sludge, which needs further treatment before disposal into the environment. Besides, the system must be economically viable and socially acceptable. In this paper an attempt has been made to review and update the recent advances made in the technological development in arsenic removal technologies to explore the potential of those advances to address the problem of arsenic contamination in South East Asia.

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“…Molybdenum is an essential element, whose compounds are useful, but it is a nuisance in areas of molybdenum mining when mining runoff water or processing water in ponds becomes a disposal problem. The initial focus was on removing arsenic species by chromatography, and a specific focus was on the iron(III) derivative of Octolig® (named "Ferrilig" ) because of the known insolubility of ferric arsenate [30][31][32].…”

Section: Removal Of Anions With Octolig® and Metal Derivatives Of Octmentioning

confidence: 99%

Chromatographic Separations with Selected Supported Chelating Agents

Martin¹

2013

Column Chromatography

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Chelex is another example of a commercially available supported chelating agent. The material was available from "io-Rad and was used to purify compounds, most notably transition metal ions. [ ] The preference for transition metal ions, e.g., copper II or iron II ions, over such univalent metal ions as sodium or potassium is said to be about to [ ]. The material consists of a styrene-divinylbenzene copolymer to which is attached iminodiacetic acid moieties.In addition, Chelex can be used for purification of DN" [ ]. Though the mechanism of action seems uncertain, a plausible suggestion is that Chelex protects DN" from the effect of heating that is used to release DN" from cells. In addition, Chelex can sequester magnesium and heavy metal ions that would adversely affect the DN". "fter treatment, DN" and RN" remain in the aqueous supernatant above the Chelex sample.Supported chelating agents serve three major functions, i.e., concentration, elimination, and recycling metal ions. Concentration of metal ions is a significant function that enhances analytical capabilities.Measuring the concentration of trace metals in dilute sea water is a significant analytical challenge. Using supported chelators allows an analyst to concentrate transition metals present in trace amounts from a large volume of sea water onto a solid in, say, a chromatography column, then eluting with dilute nitric acid to obtain a suitably concentrated solution. The technique can also be used to eliminate matrix effects. Unfortunately, Chelex seems to be less effective in sea water than in fresh water [ ]."lso, users of Chelex may encounter problems with certain natural waters that are colored with samples of naturally occurring chelating agents such as soil organic acids e.g., fulvic or humic acids that provide competition for metal ions and reduce the effectiveness of Chelex [ , ]. Ryan and Weber [ ] studied this problem and made pre-concentration comparisons of trace levels of copper ion in standard solutions comparing Chelexwith three different chelating agents supported on silica. The reagents tested were N-propylethylenediamine, the bis-dithiobicarbonate of that compound, and -hydroxyquinoline. The results indicated that in the presence of organic compounds typical organic-rich natural waters reduced the effectiveness of Chelexin comparison with the three silica-supported agents. In general, immobilizedquinolinol was the most effective, as prepared by a modified Hill procedure [ ].It is not the purpose of this review to criticize use of a successful commercial supported chelator rather one may note that no such product can be expected to be highly effective under all conditions and circumstances, so it seems appropriate to consider examples of custom-made agents.

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Removal of aqueous arsenic using iron attached to immobilized ligands (IMLIGs)

Cited by 19 publications

References 11 publications

Arsenic removal from water/wastewater using adsorbents—A critical review

Arsenic removal from water/wastewater using adsorbents—A critical review

Technological options for the removal of arsenic with special reference to South East Asia

Chromatographic Separations with Selected Supported Chelating Agents

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