Fractal-like kinetics for enhanced boron adsorption on heterogeneous magnetic composite surfaces

Camila N. Pinotti, Juan A. Ramos-Guivar, José R.C. Proveti, Yamerson Canchanya-Huaman, Mayra Alejandra Arias-Contreras, Noemi Raquel Checca-Huaman, Daniel F. Cipriano, Eduardo P. Muniz, Honério C. Jesus, Dirk Baabe, Jair C.C. Freitas, F. Jochen Litterst, Edson C. Passamani

Research output: Contribution to journalArticlepeer-review


Co-precipitated 14 nm γ-Fe2O3 and 35 nm MgO nanoparticles (NPs) decorated on zeolite 5 A (Z5A) templates were systematically studied. 57Fe Mössbauer and transmission electron microscopy data indicated a broad particle size distribution. The spinel structure of γ-Fe2O3 is strongly affected by size effects (particles smaller than 10 nm in size have an octahedral/tetrahedral iron site ratio of 7/3 instead of 5/3 found in bulk). 27Al nuclear magnetic resonance (NMR) showed the formation of octahedral Al species after boric acid reaction with MgO NPs. 11B NMR spectra indicated adsorption of B on the MgO/Z5A surface, whereas B adsorption in the pure Z5A framework is absent. Adsorption isotherms and kinetic studies of the nanohybrids showed that the B-rich species adsorption is described by Freundlich and fractal-like models, respectively. B adsorption occurs dominantly by the MgO fraction. The nanohybrids presented a good B removal efficiency when compared with other materials reported in literature.

Original languageEnglish
Article number128313
JournalMaterials Chemistry and Physics
StatePublished - 15 Oct 2023
Externally publishedYes


  • Al and B NMR
  • Fe mössbauer spectroscopy
  • Boron removal
  • Fe-based composites
  • Heterogeneous adsorption
  • Magnetic separation


Dive into the research topics of 'Fractal-like kinetics for enhanced boron adsorption on heterogeneous magnetic composite surfaces'. Together they form a unique fingerprint.

Cite this