The potential for pure zeolite formation was investigated by using sepiolite as starting material via alkaline fusion method followed by hydrothermal process. NaOH and KOH as activators were chosen for mixing with staring material at 650°C to prepare fused primary alkaline mixture. The fusion step was followed by a hydrothermal process which was performed at determined temperatures of 100, 140, 180, 220°C. Pure sodalite was obtained through synthesis experiments by application of NaOH, and KOH activators, at 140 and 180°C and reaction times of 48 and 72 hours. The XRD, SEM and FT-IR analyses were used to characterize the pure phase. Subsequently, a series of batch experiments were determined to evaluate the pure sodalite capability to remove Fe 3+ , Cr 3+ , and Cd 2+ from aqueous solutions. The results obtained through these adsorption experiments demonstrated that the optimum adsorption of Fe 3+ and Cr 3+ gained at the presence of 0.001M also 0.01M solutions and that of Cd 2+ under the influence of 0.1M solutions. In this regard the maximum adsorption amount through applying 0.001M solutions, has been occurred from 1 to 2 hours for pure sodalite 1 and from 30 minutes to 1 hour for pure sodalite 2. Whereas, by the usage of 0.01M and 0.1M solutions, the most adsorption obtained from 30 minutes to 1 hour, for applying pure sodalite 1 as well as using pure sodalite 2.
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