Sorption of Fulvic Acids and Their Compounds with Heavy Metal Ions on Clay Minerals

Nikishina, Maria B.; Perelomov, Leonid; Atroshchenko, Yury; Ivanova, Evgenia; Mukhtorov, Loik G.; Tolstoy, Peter M.

doi:10.3390/soilsystems6010002

Cited by 5 publications

(1 citation statement)

References 27 publications

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“…The polar characteristics imparted by the presence of these functional groups are responsible for binding metal to the peat surface [6,18,23,24]. Humic acids (HA) are the most active components of peat since they comprise the most important component of organic matter for ion exchange, complexation, and other sorption interactions [25,26]. Humic substances in peat form the strong bonds with heavy metals and can be used as an effective geochemical barrier [19,[27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Shvartseva

Skripkina

Gaskova

et al. 2022

Water

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This study aimed at estimating peat adsorption properties for copper ion removal from aqueous solutions during peat modification. Two peat modifications have been studied using batch tests and quantitatively reproduced with instrumental analysis by using spectrometric, potentiometric, and thermodynamic modeling methods. The first variation—mechanical activation—was carried out in a planetary mill; for the second one—mechanochemical activation—dry sodium percarbonate (Na2CO3∙1.5H2O2) was added. The adsorption of copper ions was studied in the concentration range from 10–150 mg/L with an interaction time from 0.25–12 h. Both modifications led to significant changes in the interaction energy in the adsorption layer; thus, the acceptor properties of macromolecules were enhanced from natural peat to mechanically activated peat and mechanochemically activated peat. FTIR spectra, specific surface area characteristics, and sorption experiments show the predominantly chemical nature of copper sorption. Maximum adsorption capacity was determined to be 24.1, 42.1, and 16.0 mg/g for natural peat, mechanically activated peat, and mechanochemically activated peat, respectively. The example of peat mechanochemically oxidized with Na2CO3∙1.5H2O2 shows that the improvement in the physicochemical properties (CBET and specific surface area) plays a smaller role in the sorption capacity in relation to copper ions than the presence of phenolic and carboxyl groups, the content of which decreases during oxidation.

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Section: Introductionmentioning

confidence: 99%

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Shvartseva

Skripkina

Gaskova

et al. 2022

Water

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Element Composition of Fractionated Water-Extractable Soil Colloidal Particles Separated by Track-Etched Membranes

Volkov,

Rogova,

Ovseenko

et al. 2023

Agrochemicals

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Membrane fractionation with track-etched membranes was used to size-profile the microelement composition of water-extractable soil colloids (WESCs). The aim of the study is the element composition of narrow WESC fractions of typical chernozems in the range of 0.01–10 µm. Micro-/ultrafiltration through a cascade of track-etched polycarbonate membrane filters with pore sizes of 5, 2, 1, 0.8, 0.4, 0.2, 0.1, 0.05, 0.03, and 0.01 µm at room temperature was used. ICP–AES using direct spraying of obtained fractions without decomposition was used; Al, Ba, Cd, Cr, Cu, Fe, Mn, Si, Sr, Ti, Zn, Ca, K, Mg, Na, P, and S were found. Narrow WESC fractions differ significantly. For macro- and microelements, maximum amounts of Si, Al, Fe, and Ti and their maximum percentages are observed in fractions with sizes above 1 µm, while Ca, Mg, Mn, Cu, Zn, K, and S are accumulated more in fractions with sizes below 1 µm. The developed approach provides preparative isolation of a detailed set of narrow WESC fractions in the micrometer–nanometer range. This provides element soil profiles that reveal distinct differences and the individual character of each fraction as well as trends in changes in the mineral matrix and microelement composition with fraction size.

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Degradation of Oil and Petroleum Products in Water by Bioorganic Compositions Based on Humic Acids

et al. 2023

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The use of nature-like technologies, leading to acceleration of the processes of natural destruction of pollutants, is one of the promising directions for oil and petroleum product degradation in the environment. The joint use of oil-degrading bacteria and natural polymers with the properties of surfactants and humic acids (HAs) in bioorganic compositions is effective. In this study, humic acids from reed peat, which have a critical micelle concentration (CMC) of 0.6 g/L, were used as an organic component. Oil-degrading bacteria of the genera Rhodococcus and Pseudomonas, which have an increased biodegrading ability in relation to crude oil and waste engine oil, were used as a bacterial component. Mono- and polybacterial bioorganic compositions based on these components are proposed. The emulsification index is maximum (94% ± 2%) using a bioorganic composition based on the association of strains of three bacteria. Analysis of films of model petroleum products in vitro showed a high degree of their destruction after 7 days using monobacterial bioorganic compositions (up to 80%) and after 2 days using a bioorganic composition based on 3 strains (almost 90%). A high ability to stabilize emulsions of humic acids and develop bioorganic compositions has been established, which indicates a significant potential for their use for cleaning the environment from oil pollution. The use of a combination of humic acids and oil-degrading bacteria (all strains) makes it possible to achieve the maximum stabilizing effect of emulsions: the transmission coefficients of emulsions are 37–75% lower relative to control (oil-polluted water) and 50% lower in relation to humic acids.

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Sorption of Fulvic Acids and Their Compounds with Heavy Metal Ions on Clay Minerals

Cited by 5 publications

References 27 publications

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Modification of Natural Peat for Removal of Copper Ions from Aqueous Solutions

Element Composition of Fractionated Water-Extractable Soil Colloidal Particles Separated by Track-Etched Membranes

Degradation of Oil and Petroleum Products in Water by Bioorganic Compositions Based on Humic Acids

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