Zeolites And Mixed Oxides In The Removal Of Cr (vi)

In this work, different natural zeolites, namely Clinoptilolite (Mexico) and Sample 7 (Ethiopia),rnmesoporous material SBA-15 calcined and uncalcined as well as mixed oxides Hydrotalcite andrnSBA-15 supported hydrotalcite were employed for removal of chromate from aqueous solution.rnThis materials show adsorption capacity with different mechanisms and ion (cation and anion)rnexchange properties. UV-Vis spectroscopy was used for determining the concentration of Crrn(VI) before and after the treatment.rnObtained data from chromate adsorption experiments over the mentioned materials wererncompared. It was shown that adsorption data for natural zeolite was very good having 66.5% andrn74.5% adsorption capacity for Clinoptilolite and Sample 7, respectively. Maximum chromaternadsorption was found over mixed oxides: 98.4% and 88.7% for SBA-15/HT and HT,rnrespectively. It was much greater than that of the natural zeolites and mesoporous materials. Forrncomparison purpose, pure silica mesoporous materials calcined and uncalcined SBA-15 wererntested, showing retaining capacity of 13.6% and 39.89%, respectively. Finally, SBA-15/HTrncomposite appears as a promising adsorbent for removal of chromate ion from waste waters.

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