Table 3 Chemical composition of natural zeolite material used in the present study

Element

\( {\text{Na}}_{2} {\text{O}} \)

\( {\text{MgO}} \)

\( {\text{Al}}_{2} {\text{O}}_{3} \)

\( {\text{SiO}}_{2} \)

\( {\text{P}}_{2} {\text{O}}_{5} \) ^a

\( {\text{SO}}_{2} \) ^a

\( {\text{K}}_{2} {\text{O}} \)

\( {\text{CaO}} \)

\( {\text{TiO}}_{2} \)

\( {\text{MnO}} \)

\( {\text{Fe}}_{2} {\text{O}}_{3} \)

\( {\text{BaO}} \)

LOI^b