3.2.4. Influence of NaOH modification on binding energy of atoms
As indicated by Fig. 8, the Al2p, O1s and Si2p spectra of clinoptilolite
modified by NaOH changed inconspicuous. It shows that
the concentration within 3 mol L_1 does not influence the silicon
aluminium frame of clinoptilolite. Alkalis modification introduces
metal ions into the clinoptilolite framework by substitutions or
adsorption, which would affect the electron cloud density around
the Si, Al and O atoms. The impact brings about by the change, not
measured in the XPS detection