Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes

Busch, Verónica María; Loosli, Frédéric; Santagapita, Patricio R.; Buera, M. Pilar; Stoll, Serge

doi:10.1016/j.scitotenv.2015.05.134

Cited by 17 publications

(3 citation statements)

References 33 publications

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“…In addition, natural inorganic colloidal material in the smallest size range (<20 nm) significantly influenced the interactions of metals such as Pb , or As with HS, however, have no effect on Cu ,, in riverine systems. The behavior of metals associated with these small colloids is affected by ferrihydrite solubility and coagulation, both of which depend on environmental variables such as pH, ionic strength, temperature, pO 2 , and Fe/DOM ratio. ,, Besides, the nature and properties of DOM also affect the behavior of iron colloid formation and their stability in aquatic media. − …”

Section: Introductionmentioning

confidence: 99%

Dissolved Organic Matter and Associated Trace Metal Dynamics from River to Lake, Under Ice-Covered and Ice-Free Conditions

Worms

Chmiel

Traber

et al. 2019

Environ. Sci. Technol.

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The present study investigates the changes in dissolved organic matter (DOM) composition and its influences on trace metal dispersion from the Shuya River (SR) in the Petrozavodsk Bay of Lake Onega during icecovered and ice-free periods. Humic substances (HS) found in the SR dominated the composition of DOM through the river-bay-lake continuum in both periods. When the bay was ice-covered, both the aromaticity and the size of HS varied in the water column according to a horizontal stratification and decreased in the bay, while under ice-free conditions, they decreased along the river-lake gradient, suggesting in both cases a decrease in the proportion of HS with high aromatic character. These findings were associated with an overall decrease in the proportion of HS components that have the highest molecular masses. The quantification of metal bound to HS revealed that these characteristics were associated with a decrease in the binding capacity of the HS for Fe and Al but not Cu while dispersing in the bay to the lake. Pb was found to bind on HS, but its behavior in the bay could not be related to the HS dispersion nor to the changes in HS properties.

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Section: Introductionmentioning

confidence: 99%

Dissolved Organic Matter and Associated Trace Metal Dynamics from River to Lake, Under Ice-Covered and Ice-Free Conditions

Worms

Chmiel

Traber

et al. 2019

Environ. Sci. Technol.

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“…It is known that the inclusion of food gums on mixtures of emulsions to form beads has advantages showing a more rigid structure and at the same time protects the compound from diffusion [13]; then, the inclusion of four neutral gums was assessed: guar and Arabic gums, which are two of the most used gums, and two novel gums, vinal and espina corona gums. The latter gums are novel nongelling biopolymers that provide high viscosity to aqueous solutions and are relatively stable against variations in pH, ionic strength, and temperature [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical Characterization of Alginate Beads Containing Sugars and Biopolymers

Aguirre-Calvo

Santagapita

2016

Journal of Quality and Reliability Engineering

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Alginate hydrogels are suitable for the encapsulation of a great variety of biomolecules. Several alternatives to the conventional alginate formulation are being studied for a broad range of biotechnological applications; among them the addition of sugars and biopolymers arises as a good and economic strategy. Sugars (trehalose and β-cyclodextrin), a cationic biopolymer (chitosan), an anionic biopolymer (pectin), and neutral gums (Arabic, guar, espina corona, and vinal gums) provided different characteristics to the beads. Here we discuss the influence of beads composition on several physicochemical properties, such as size and shape, analyzed through digital image analysis besides both water content and activity. The results showed that the addition of a second biopolymer, β-CD, or trehalose provoked more compact beads, but the fact that they were compact not necessarily implies a concomitant increase in their circularity. Espina corona beads showed the highest circularity value, being useful for applications which require a controlled and high circularity, assuring quality control. Beads with trehalose showed lower water content than the rest of the system, followed by those containing galactomannans (espina corona, vinal, and guar gums), revealing polymer structure effects. A complete characterization of the beads was performed by FT-IR, assigning the characteristics bands to each individual component.

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“…The aggregated morphologies under the TEM was easily observed in the sample prepared using the Milli-Q water (pH = 7.1). The adsorption of dicarboxylate would result in a polyanionic organic coating on mineral particles altering essentially the surface properties of minerals. , In the presence of succinate and malonate, the pH iep value of goethite shifted to 5.1 and 2.0, respectively. It was noted that the amount of complexed ligand on the particle surface increased with the lowering of pH .…”

Section: Resultsmentioning

confidence: 99%

Ligand-Promoted Photoreductive Dissolution of Goethite by Atmospheric Low-Molecular Dicarboxylates

Wang

Zhang

et al. 2017

J. Phys. Chem. A

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Recent evidence suggested that organic ligands in atmosphere water play an important role in the mobilization of iron from mineral aerosol. In this study, the dissolution of goethite (α-FeOOH) was investigated in the presence of three low-molecular dicarboxylates enriched in the atmosphere, as well as a reference organic acid of methanesulfonate (MSA), which is especially abundant in marine atmospheric boundary layer. Iron mobilized from α-FeOOH was promoted under the irradiation and the deaerated condition, and the soluble Fe(II) concentration was enhanced greatly in the ligand-containing suspensions exposed to light. Irrespective of the reaction conditions, the capacities of the dicarboxylates on Fe mobilization were in the following order: oxalate > malonate > succinate, which were closely correlated with the carbon chain length of dicarboxylates: n = 2 > 3 > 4. The space barrier action of carbon atoms inhibited ligand-promoted Fe dissolution by affecting the structure and stability of the complexes. MSA also acted as an organic ligand to mobilize iron and showed weak capacity to reduce Fe(III) under the irradiation. The reactive oxygen species (ROS) analysis indicated that ·OH, O·, and HO could be involved in the Fe(II)-Fe(III) redox circle, and the ligand-promoted photoreductive dissolution process could be an important source of ROS in atmosphere water. Both transmission electron microscopy analysis and zeta potential data supported that the adsorption of oxalate molecules onto the surface would change the aggregation state of goethite nanoparticles, which increased the effective surface area, and therefore facilitated Fe mobilization from the oxide. The data shown herein deepens our understanding on the ligand-promoted dissolution mechanisms, which could be an important formation pathway of bioavailable Fe in the atmosphere.

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Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes

Cited by 17 publications

References 33 publications

Dissolved Organic Matter and Associated Trace Metal Dynamics from River to Lake, Under Ice-Covered and Ice-Free Conditions

Dissolved Organic Matter and Associated Trace Metal Dynamics from River to Lake, Under Ice-Covered and Ice-Free Conditions

Physicochemical Characterization of Alginate Beads Containing Sugars and Biopolymers

Ligand-Promoted Photoreductive Dissolution of Goethite by Atmospheric Low-Molecular Dicarboxylates

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