of clinoptilolite is Kþ>NH4
þ>Naþ>Ca2þ>Al3þ>Mg2þ [12]. It indicated
that Na element which located in the front of the priority
exchange ion order was relatively easy to swap out other elements.
The bivalent elements Ca and Mg were easy to be swapped out, but
the radius of Mg2þ is 0.78 Å smaller than Kþ(1.33 Å), Naþ(0.95 Å)
and Ca2þ(1.05 Å). The Mg element which was less, more easily
entered into the channel inside, was not easy to be traded and the
exchange effect was not obvious. After modified with different
concentrations of NaOH, there were large amount of K, Al and Si
element in the solution which was different with other modification
methods. Groen J C et al. had similar observation in the study of
the alkali solution could remove the soluble silica in clinoptilolite
of clinoptilolite is Kþ>NH4þ>Naþ>Ca2þ>Al3þ>Mg2þ [12]. It indicatedthat Na element which located in the front of the priorityexchange ion order was relatively easy to swap out other elements.The bivalent elements Ca and Mg were easy to be swapped out, butthe radius of Mg2þ is 0.78 Å smaller than Kþ(1.33 Å), Naþ(0.95 Å)and Ca2þ(1.05 Å). The Mg element which was less, more easilyentered into the channel inside, was not easy to be traded and theexchange effect was not obvious. After modified with differentconcentrations of NaOH, there were large amount of K, Al and Sielement in the solution which was different with other modificationmethods. Groen J C et al. had similar observation in the study ofthe alkali solution could remove the soluble silica in clinoptilolite
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