Magnetic composites from minerals: Study of the iron phases in clay and diatomite using Mössbauer spectroscopy, magnetic measurements and XRD

M. Cabrera, J. C. Maciel, J. Quispe-Marcatoma, B. Pandey, D. F.M. Neri, F. Soria, E. Baggio-Saitovitch, L. B. de Carvalho

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

Magnetic particles as matrix for enzyme immobilization have been used and due to the enzymatic derivative can be easily removed from the reaction mixture by a magnetic field. This work presents a study about the synthesis and characterization of iron phases into magnetic montmorillonite clay (mMMT) and magnetic diatomaceous earth (mDE) by 57Fe Mössbauer spectroscopy (MS), magnetic measurements and X-ray diffraction (XRD). Also these magnetic materials were assessed as matrices for the immobilization of invertase via covalent binding. Mössbauer spectra of the magnetic composites performed at 4.2 K showed a mixture of magnetite and maghemite about equal proportion in the mMMT, and a pure magnetite phase in the sample mDE. These results were verified using XRD. The residual specific activity of the immobilized invertase on mMMT and mDE were 83 % and 92.5 %, respectively. Thus, both magnetic composites showed to be promising matrices for covalent immobilization of invertase. © 2013 Springer Science+Business Media Dordrecht.
Original languageAmerican English
Pages (from-to)197-204
Number of pages8
JournalHyperfine Interactions
DOIs
StatePublished - 1 Jan 2014
Externally publishedYes

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