2026-06-27T11:09:27Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/82332023-08-26T13:40:47Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Álvarez Torrellas, Silvia
author
Boutahala, Mokhtar
author
Boukhalfa, Nadia
author
Munoz, Macarena
2023-06-17T09:07:44Z
2023-06-17T09:07:44Z
2019-10-27
2076-3417
10.3390/app9214563
https://hdl.handle.net/20.500.14352/8233
https://doi.org/10.3390/app9214563
https://www.mdpi.com/2076-3417/9/21/4563
In the present study, new adsorbent beads of alginate (A)/maghemite nanoparticles (γ-Fe2O3)/functionalized multiwalled carbon nanotubes (f-CNT) were prepared and characterized by several techniques, e.g., N2 adsorption-desorption isotherms, Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA/DTG), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM) and further tested for the adsorption of the dye methylene blue (MB) from water. The beads (A/γ-Fe2O3/f-CNT) presented a relatively low BET specific surface area value of 59 m2g−1. The magnetization saturation values of A/γ-Fe2O3/f-CNT beads determined at 295 K was equal to 27.16 emu g−1, indicating a magnetic character. The time needed to attain the equilibrium of MB adsorption onto the beads was estimated within 48 h. Thus, several kinetic and isotherm equation models were used to fit the kinetic and equilibrium experimental results. The number of adsorbed MB molecules per active site, the anchorage number, the receptor sites density, the adsorbed quantity at saturation, the concentration at half saturation and the molar adsorption energy were quantified using the monolayer model. The calculated negative ΔG0 and positive ΔH0 values suggested the spontaneous and endothermic nature of the adsorption process. In addition, A/γ-Fe2O3/f-CNT composites can be used at least for six times maintaining their significant adsorptive performance and could be easily separated by using a magnet from water after treatment.
eng
Atribución 3.0 España
Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies
journal article
URL
https://docta.ucm.es/bitstreams/81301041-a1c2-4b3b-85fc-885472701b19/download
File
MD5
718eeab5e4ece7c72d5139a117ee75f9
3941682
application/pdf
applsci-09-04563-v2.pdf