Sorption of uranium, radium, and thorium from saline solutions on hydrolyzed wood lignin

Рачкова, Н. Г.; Шуктомова, И. И.; Taskaev, A. I.

doi:10.1134/s1070427206050041

Cited by 13 publications

(6 citation statements)

References 3 publications

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“…Therefore, solving the problem of the structural organization of new macromolecules requires scoring the fracton dimension of ds. According to Vilgis [39], the d s of a macromolecule in solvent can be calculated using Equation (15):…”

Section: Resultsmentioning

confidence: 99%

“…To continue the development of the physicochemistry of lignins as typical macromolecular compounds, it becomes necessary to introduce an additional criterium: the fractal dimension [11][12][13], which will make it possible to identify the topological structures of lignins more reliably. Knowledge of the topology of any polymer, including a lignin, makes it possible to predict the physical and physicochemical properties of materials based on, for example, fiberforming or adsorption properties with respect to various toxicants, such as mycotoxins and radionuclides [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks

Karmanov,

Kocheva,

Borisenkov

et al. 2023

Polymers

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The topological structure of the macromolecules of lignins isolated from oat husk and fir wood was studied by means of macromolecular hydrodynamic methods. The macromolecular properties were analyzed by evaluating the intrinsic viscosity and coefficients of the translational diffusion and the sedimentation velocity of the lignins in dilute dimethylformamide solutions. The average molecular weights (MDη) and polydispersity parameters were calculated based on the results of the fractionation, as follows: Mw = 14.6 × 103, Mn = 9.0, and Mw/Mn = 1.62 for lignins from fir wood and Mw = 14.9 Mn = 13.5 and Mw/Mn = 1.1 for lignins from oat husks. The fractal analysis of the lignin macromolecules allowed us to identify the distinctive characteristics of the fractal and topological structures of these lignins. The measurements indicated that the fractal dimension (df) values of the guaiacyl-syringyl lignins from oat husks were between 1.71 and 1.85, while the df of a typical guaiacyl lignin from fir wood was ~2.3. Thus, we determined that the lignin macromolecules of oat husks belong to the diffusion-limited aggregation-type cluster–cluster class of fractals of the Meakin–Kolb type, with a predominance of characteristics common to a linear configuration. The lignins of softwood fir trees exhibited a branched topological structure, and they belong to the diffusion-limited aggregation-type particle–cluster class of fractals of the Witten–Sander type. Lignins from oat husks have the linear topology of macromolecules while the macromolecules of the lignins from fir wood can be characterized as highly branched polymers.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks

Karmanov,

Kocheva,

Borisenkov

et al. 2023

Polymers

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“…Even more general have been studies of the way in which radioisotopes, usually of heavy metals, behave in tank waste sludges, 275 in peat, 276 in different soils 277 and in alluvial sediments. 278,279 Organic materials from plants, such as chitin 280 (Pu & Np), hydrolised wood lignin 281 (Th, Ra & U), and cotton stalks 282 (rare earths, Th & U) have also been shown to be very effective at adsorbing radio-isotopes. Studies have also been reported of the adsorption of technetium 283 onto stibnite (Sb 2 S 3 ), of americium onto silica 284 impregnated with g-irradiated thiacalix [4]arene, of neptunium 285 on hydroxy-apatite, of many radioisotopes on zirconium molybdate 286 and of caesium and americium 287 on ion-exchange resins in the presence of liquid carbon dioxide.…”

Section: Adsorption Of Radioisotopesmentioning

confidence: 99%

Radiochemistry

Urch

2007

Annu. Rep. Prog. Chem., Sect. A: Inorg. Chem.

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“…[4] Due to the presence of such chemical structures as carboxyl, hydroxyl and carbonyl together with aromatic moieties lignin is capable of binding many organic and inorganic toxicants. Sorption capacity of lignocellulosic materials towards a broad range of contaminants such as transition metals, [4][5][6][7][8][9][10][11][12][13][14][15] radionuclides, [16] and PAH [17] has been demonstrated. Low cost and potentially large quantities of lignin available are additional factors making it an attractive material for bioremediation applications.…”

Section: Introductionmentioning

confidence: 99%

Modified kraft lignin for bioremediation applications

Santos

Rudnitskaya

Evtuguin

2012

Journal of Environmental Science and Health, Part A

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Kraft lignin (KL) from industrial pulping of E. globulus wood was subjected to the oxidative modification with the aim to produce sorbent mimicking humic matter for the bioremediation purposes. Lignin was oxidized by polyoxometalate Na 5 [PMo 10 V 2 O 40 ] (POM), solely or in the presence of laccase, under pre-selected aerobic conditions (50-60 • C, 1-2h, oxygen pressure 5 bar). The most pronounced lignin oxidation without its depolymerisation was observed in the reaction system POM/O 2 . Modified lignins possessed increased amounts of COOH (up to 15 %) and CO (up to 500 %) groups, when compared to unmodified KL, and significantly higher molecular weights. Sorption capacity of KL before and after modification towards transition metals (cadmium (II) and mercury (II)) and triazine pesticide (atrazine) was assessed in batch experiments under equilibrium conditions. KL oxidation improved sorption capacity towards transition metals (up to 15 %) but not necessarily the uptake of atrazine that was higher for unmodified KL.

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Sorption of uranium, radium, and thorium from saline solutions on hydrolyzed wood lignin

Cited by 13 publications

References 3 publications

Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks

Macromolecular Hydrodynamics and Fractal Structures of the Lignins of Fir Wood and Oat Husks

Radiochemistry

Modified kraft lignin for bioremediation applications

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