Synthesis and Characterization of HS,X and HS + Xtype Zeolites from Kaolin and the Study of Their Ion Exchange Capacity for Cu~(2+),Ni~(2+)and Co~(2+)

摘要

HS,X and HS + X type zeolites are synthesized from kaolin clay having a large amount of impurities such as quartz(39 %)by hydrothermal treatment with NaOH in presence of sodium chloride.The zeolites are crystallized under the optimum hydro-thermal conditions and characterized by XRD,FT-IR spectroscopy,BET surface area and SEM-EDS methods.The effects of aging time,crystallization time and crystallization temperature in synthesis of these zeolites are also investigated.Cation exchange capacity(CEC)of X,HS and X + HS(mixed crystallized)zeolites for Cu~(2+),Ni~(2+)and Co~(2+)were determined that they act selectively for exchanging of Cu~(2+)cation.The cation exchange capacity of these zeolites for mentioned cations were increases as follows:X + HS > X > HS.The XRD patterns of cation exchanged zeolites are also investigated.