Sorption of metal ions on lignite and the derived humic substances

Havelcová, Martina; Mizera, Jiří; Sýkorová, Ivana; Pekař, Miloslav

doi:10.1016/j.jhazmat.2008.03.136

Cited by 111 publications

(47 citation statements)

References 25 publications

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“…Carboxyl, quinoid, phenolic, SH, and other electrondonating groups of HS are known to be responsible for binding and, hence, decreasing the amount of free metal ions in water ecosystems (Theng 2012;Sachs and Bernhard 2011;AlAbri et al 2010;Havelcová et al 2009;Lorenzo et al 2002). Phenolic, SH, and other groups of HS macromolecules reduce toxic impact of organic and inorganic oxidizers.…”

Section: Humic Substances As Natural Detoxifying Agentsmentioning

confidence: 99%

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Kudryasheva

Tarasova

2014

Environ Sci Pollut Res

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The paper considers mechanisms of detoxification of pollutant solutions by water-soluble humic substances (HSs), natural detoxifying agents. The problems and perspectives of bioassay application for toxicity monitoring of complex solutions are discussed from ecological point of view. Bioluminescence assays based on marine bacteria and their enzymes are of special attention here; they were shown to be convenient tools to study the detoxifying effects on cellular and biochemical levels. The advantages of bioluminescent enzymatic assay for monitoring both integral and oxidative toxicities in complex solutions of model pollutants and HS were demonstrated. The efficiencies of detoxification of the solutions of organic oxidizers and salts of metals (including radioactive ones) by HS were analyzed. The dependencies of detoxification efficiency on time of exposure to HS and HS concentrations were demonstrated. Antioxidant properties of HS were considered in detail. The detoxifying effects of HS were shown to be complex and regarded as 'external' (binding and redox processes in solutions outside the organisms) and/or 'internal' organismal processes. The paper demonstrates that the HS can stimulate a protective response of bacterial cells as a result of (1) changes of rates of biochemical reactions and (2) stabilization of mucous layers outside the cell walls. Acceleration of auto-oxidation of NADH, endogenous reducer, by HS was suggested as a reason for toxicity increase in the presence of HS due to abatement of reduction ability of intracellular media.

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Section: Humic Substances As Natural Detoxifying Agentsmentioning

confidence: 99%

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Kudryasheva

Tarasova

2014

Environ Sci Pollut Res

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“…The removal of toxic heavy metals from industrial wastewater is one of the most important issues of environmental remediation (Buamah et al, 2008;Havelcova et al, 2009;Panuccio et al, 2008). Immobilisation of heavy metals can be carried out by using chemical agents or materials that combine metal ions to form stable, non-mobile, poorly soluble compounds.…”

Section: Introductionmentioning

confidence: 99%

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Baltakys¹,

Eisinas²,

Šiaučiūnas³

2014

Advances in Cement Research

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The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages Baltakys, Eisinas and Siauciunas This study examined the effect of gyrolite substituted with cadmium ions on the kinetics of the hydration of ordinary Portland cement (OPC) at early stages of hydration. Gyrolite was synthesised after 48 h at 2008C from a stoichiometric composition (calcium oxide/silica dioxide 0 . 66) of calcium oxide and a hydrated silica mixture. Calcium silicate hydrate substituted with cadmium ions (97 mg cadmium ions/g) was added as a partial replacement of the OPC at levels of 0%, 2 . 5%, 5% and 7 . 5% by weight of the total cementitious material. Therefore, the water-to-cement ratio of all OPC samples was 0 . 5. It was found that the additive of a synthetic contaminated with cadmium ions (,97 mg cadmium ions/g) retained very good adsorption properties for the alkaline and alkaline earth ions that penetrated into the gyrolite structure. It was estimated that this additive accelerates the early stage (5-7 h) of hydration of OPC and its individual compounds. It was found that during the main reaction of calcium silicate, the additive of gyrolite contaminated with cadmium ions had no influence on the apparent reaction rate (W app ) of the hydration process (7-12 h): in all samples, the increase in the degree of hydration (˜AE) was almost the same:˜AE 15%. Notation c concentration k app reaction rate n app evaluated reaction order S a specific surface area T time W app apparent reaction rate X ô amount of tricalcium silicate that reacted AE degree of hydration

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“…It is well known that humic substances have substantial ability to bind heavy metal ions [1][2][3][4][5][6][7][8][9][10][11][12]. The major binding sites are attributed to the oxygencontaining functional groups such as carboxylic and phenolic groups, which contribute to the total acidity of humic substances [13].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Humic Acid Onto Chitosan Using Tosylation Method With 1,4-Butanediol as a Spacer Arm

Santoso¹,

Nurmasari²,

Umaningrum³

et al. 2012

Indones. J. Chem.

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Sorption of metal ions on lignite and the derived humic substances

Cited by 111 publications

References 25 publications

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

Pollutant toxicity and detoxification by humic substances: mechanisms and quantitative assessment via luminescent biomonitoring

The effect of gyrolite substituted with cadmium ions on the hydration kinetics of OPC at early stages

Immobilization of Humic Acid Onto Chitosan Using Tosylation Method With 1,4-Butanediol as a Spacer Arm

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