Study of agglomeration and magnetic sedimentation of Glutathione@Fe3O4 nanoparticles in water medium

Abstract

The study of the efficiency of the magnetic separation of nanoparticles in environment is important for its implementation in the remediation of water bodies. In this work the sedimentation dynamics of Glutathione@MNPs were evaluated for water systems with addition of calcium, zinc and sodium ions in a concentration range of 0-40 mg/L in the presence and absence of a vertical magnetic field of 0.2 T. Also, critical coagulation concentrations (CCC) were determined based on the DLVO theory. Particles stability in the absence of metal ions higher than 8 weeks could be observed, whereas in the presence of these ions the stability was reduced to 8 weeks. Separation of the material from the aqueous phase higher than 90% was obtained both for the presence of ions and for the material after the addition of heavy metals such as Hg and Cr.Keywords: Glutathione; magnetic nanoparticles; aggregation kinetics; magnetic sedimentation.Estudio de aglomeración y sedimentación magnética de nanopartículas de Glutatión@Fe 3 O 4 en medio acuoso Resumen El estudio de la eficiencia de la separación magnética de nanopartículas del medio ambiente es importante para su implementación en la remediación de cuerpos de agua. En este trabajo se evaluó la dinámica de sedimentación de los Glutatión@MNPs en sistemas de agua con adición de iones de calcio, zinc y sodio en un rango de concentración de 0-40 mg/L en presencia y ausencia de un campo magnético vertical de 0,2 T. Las concentraciones críticas de coagulación (CCC) se determinaron basándose en la teoría de DLVO. Se observó estabilidad de la partícula mayor de 8 semanas en ausencia de iones metálicos, mientras que con la presencia de estos iones la estabilidad se redujo a 8 semanas. La separación del material de la fase acuosa superior al 90% se obtuvo tanto para la presencia de iones como para el material después de la adición de metales pesados tales como Hg y Cr.Palabras clave: Glutatión; nanopartículas magnéticas; cinética de agregación; sedimentación magnética.

Metal-based-oxide nanoparticles assisted the in vitro culture growth of Populus alba as micronutrients: essential metabolic processes and genetic stability

“…In addition, the strength of the steric forces of the functional groups on the surface of nanoparticles and a steric interaction caused by the formation of a layer of water around the material. 59 In this regard, the hydrodynamic diameter ( H D ) of Fe 2 O 3 nanoparticles was about 232 ± 29.24 nm (see Fig. 4a and Table 2 ).…”

Magnetite Nanoparticles Functionalized with RNases against Intracellular Infection of Pseudomonas aeruginosa

“…As shown in Figure 1 B, MNP-RNase presents higher hydrodynamic diameters, thereby reproducing our previous results after conjugation of Buforin-II on PEA-modified MNPs [ 33 ]. The increase in hydrodynamic diameter is most likely due to aggregation phenomena during the immobilization of RNases [ 54 ]. This undesired effect most likely takes place during the washing steps, where 1.5% NaCl is added to the suspension to neutralize superficial charges and induce precipitation of the nanobioconjugates.…”

“…This allowed us to estimate that 1 mg/mL of nanobioconjugates correspond to 15.52 µM for RNase A and 16.62 µM for RNase 3/1, respectively. diameter is most likely due to aggregation phenomena during the immobilization of RNases [54]. This undesired effect most likely takes place during the washing steps, where 1.5% NaCl is added to the suspension to neutralize superficial charges and induce precipitation of the nanobioconjugates.…”

Study of the catalytic activity of multilayer graphene (MLG), molybdenum oxide (MoO2), and manganese ferrite (MnFe2O4) on the melanoidin removal by ozonation process

“…The MnFe 2 O 4 and MoO 2 powders show similar morphology, which are composed of irregular particles with a high degree of agglomeration with average size of 10-20 µm. The agglomeration of MnFe 2 O 4 can be attributed to the magnetic interactions between those particles (Li et al 2009;Bakhteeva et al 2015;Marimón-Bolívar and González 2018). The use of the EDS technique was important to evaluate the expected composition of all the catalyst powders, presented in Table 1.…”

“…In fact, powder agglomeration plays an important role in the efficiency of a catalyst, since accessibility to active sites decreases, with the consequent decrease in surface area in aggregate systems. (Bakhteeva et al 2015;Marimón-Bolívar and González 2018). To reduce the agglomeration issue, different materials and treatments have been employed (Luciano et al 2020;Baig et al 2021;Zhu et al 2020).…”