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Having secured access to clean and healthy water sources has been a continual demand of all societies from the first date of history of mankind although it might not always be easily accessible. One of the main factors that makes this access hard to achieve is the existence of heavy cations such as Ca2+. So far, different methods have been proposed to remove these heavy cations from water. Among them, here we focus on using one of the well-known zeolites, i.e. LTA synthesis zeolite to remove heavy Ca2+ cations due to its excellent selective ionic exchange property. For this purpose, LTA zeolite is synthesized in autoclave with Ludox and aluminum isopropoxide as a source of Si and aluminum respectively alongside NaOH. SEM and XRD of samples have been studied in different temporal and thermal conditions and based on the obtained results, for the formulization of 3.5Na2O:Al2O3:2SiO2:200H2O gel, synthesis of LTA zeolite for 28 hours in 65ºC is chosen as an optimal condition. After synthesize, we measured the absorption power of Ca2+cations and through the exchanging of Na+ ions with Li+, we improved the process of separation and absorption of Ca2+. To be more specific, after activation, in the best case the absorption power of Ca ions was increased approximately by a factor of 2. Finally, we repeated the process for different thermal conditions and compared the results.

Keywords: Zeolite LTA, Ion exchange, Ca cations, Hard water softening

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