by 1.00 mol L1 and 3.00 mol L1 NaOH showed the same major
bands that were found in the natural clinoptilolite. The integral
intensity of the band corresponding to AleOeSi vibration
(721 cm1) did not decrease as roasting, microwave and acid
modified. Consistent with the XRD test results, the NaOH modification
has no effect on the skeleton structure of the clinoptilolite,
just selective removal the amorphous silicon in the clinoptilolite
framework.