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Abstract:

The physicochemical characteristics of hematite nanoparticles related to their size, surface area and reactivity make them useful for many applications, as well as suitable models to study aggregation kinetics. For several applications (such as remediation of contaminated groundwater) it is crucial to maintain the stability of hematite nanoparticle suspensions in order to assure their arrival to the target place. The use of biopolymers has been proposed as a suitable environmentally friendly option to avoid nanoparticle aggregation and assure their stability. The aim of the present work was to investigate the formation of complexes between hematite nanoparticles and a non-conventional galactomannan (vinal gum - VG) obtained from Prosopis ruscifolia in order to promote hematite nanoparticle coating with a green biopolymer. Zeta potential and size of hematite nanoparticles, VG dispersions and the stability of their mixtures were investigated, as well as the influence of the biopolymer concentration and preparation method. DLS and nanoparticle tracking analysis techniques were used for determining the size and the zeta-potential of the suspensions. VG showed a polydispersed size distribution (300-475. nm Z-average diameter, 0.65. Pdi) and a negative zeta potential (between - 1 and - 12. mV for pH. 2 and 12, respectively). The aggregation of hematite nanoparticles (3.3. mg/L) was induced by the addition of VG at lower concentrations than 2. mg/L (pH. 5.5). On the other hand, hematite nanoparticles were stabilized at concentrations of VG higher than 2. mg/L. Several phenomena between hematite nanoparticles and VG were involved: steric effects, electrostatic interactions, charge neutralization, charge inversion and polymer bridging. The process of complexation between hematite nanoparticles and the biopolymer was strongly influenced by the preparation protocols. It was concluded that the aggregation, dispersion, and stability of hematite nanoparticles depended on biopolymer concentration and also on the way of preparation and initial physicochemical properties of the aqueous system. © 2015 Elsevier B.V.

Registro:

Documento: Artículo
Título:Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes
Autor:Busch, V.M.; Loosli, F.; Santagapita, P.R.; Buera, M.P.; Stoll, S.
Filiación:Departamento de Industrias, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes 2160, Ciudad Universitaria, Ciudad Autonoma de Buenos Aires, C1428EGA, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Ciudad Autónoma de Buenos Aires, Argentina
Group of Environmental Physical Chemistry, F.-A. Forel Institute, University of Geneva, 10 route de Suisse, Versoix, 1290, Switzerland
Palabras clave:Aggregation kinetics; Hematite nanoparticles; Iron oxides; Polymer-nanoparticle interaction; Vinal gum; Agglomeration; Biomolecules; Biopolymers; Copolymers; Dispersions; Groundwater; Groundwater pollution; Hematite; Iron oxides; Remediation; Stability; Zeta potential; Aggregation kinetics; Hematite nanoparticles; Nanoparticle aggregation; Nanoparticle tracking analysis; Physicochemical characteristics; Physicochemical property; Polymer nanoparticles; Vinal gum; Nanoparticles; galactomannan; hematite nanoparticle; nanoparticle; unclassified drug; vinal gum; ferric ion; ferric oxide; galactomannan; mannan; nanoparticle; aggregation; complexation; hematite; iron oxide; particle size; physicochemical property; polymer; polysaccharide; reaction kinetics; Article; bioremediation; chemical interaction; complex formation; concentration (parameters); dispersion; molecular stability; nonhuman; particle size; pH; physical chemistry; polymerization; priority journal; Prosopis; Prosopis ruscifolia; static electricity; stereochemistry; surface property; zeta potential; chemical model; chemistry; kinetics; Prosopis ruscifolia; Ferric Compounds; Kinetics; Mannans; Models, Chemical; Nanoparticles; Particle Size; Static Electricity
Año:2015
Volumen:532
Página de inicio:556
Página de fin:563
DOI: http://dx.doi.org/10.1016/j.scitotenv.2015.05.134
Título revista:Science of the Total Environment
Título revista abreviado:Sci. Total Environ.
ISSN:00489697
CODEN:STEVA
CAS:galactomannan, 11078-30-1; ferric ion, 20074-52-6; ferric oxide, 1309-37-1, 56449-54-8; mannan, 51395-96-1, 9036-88-8; Ferric Compounds; ferric oxide; galactomannan; Mannans
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00489697_v532_n_p556_Busch

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Citas:

---------- APA ----------
Busch, V.M., Loosli, F., Santagapita, P.R., Buera, M.P. & Stoll, S. (2015) . Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes. Science of the Total Environment, 532, 556-563.
http://dx.doi.org/10.1016/j.scitotenv.2015.05.134
---------- CHICAGO ----------
Busch, V.M., Loosli, F., Santagapita, P.R., Buera, M.P., Stoll, S. "Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes" . Science of the Total Environment 532 (2015) : 556-563.
http://dx.doi.org/10.1016/j.scitotenv.2015.05.134
---------- MLA ----------
Busch, V.M., Loosli, F., Santagapita, P.R., Buera, M.P., Stoll, S. "Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes" . Science of the Total Environment, vol. 532, 2015, pp. 556-563.
http://dx.doi.org/10.1016/j.scitotenv.2015.05.134
---------- VANCOUVER ----------
Busch, V.M., Loosli, F., Santagapita, P.R., Buera, M.P., Stoll, S. Formation of complexes between hematite nanoparticles and a non-conventional galactomannan gum. Toward a better understanding on interaction processes. Sci. Total Environ. 2015;532:556-563.
http://dx.doi.org/10.1016/j.scitotenv.2015.05.134