Preparation, Characterization, and Application of Magnetic Fe-SBA-15 Mesoporous Silica Molecular Sieves

Table 1

Mössbauer parameters of Fe-SBA-15.

Sample	Components	IS (mm/s)	QS (mm/s)	𝐻eff (T)	FWHM (mm/s)	𝐺 (%)
	Fe	0.38	0.93	—	0.44	17.0
Fe-SBA-15	Fe^2+	1.14	2.81	—	0.33	64.5
	Fe^3+	−0.002	0.01	33.03	0.24	18.5

IS: isomer shift; QS: quadrupole splitting; H_eff: effective internal magnetic field; FWHM: full line width at half maximum; 𝐺: relative weight of the partial components in the spectra.