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EFFECT OF THE ACID TYPE ON THE NATURAL ZEOLITE STRUCTURE

In this study, Clinoptilolite-rich zeolitic tuff was treated with acids such as HCl, HNO 3 , H 2 SO 4 , and H 3 PO 4 . The effect of periods of time (3 hours and 6 hours), concentration (1 M, 2 M, 3 M, 5 M, and 10 M) and acid type were taken as parameters. In the characterization of the zeolites, XRD, ICP-AES, FTIR, and SEM techniques were used. As the acid concentration and the treatment time were increased, the aluminum and cation removal from the structure was increased. HCl and HNO 3 were more effective acids for the dealumination than H 2 SO 4 and H 3 PO 4 . It was found out that considerable change in the texture of the zeolitic tuff didn’t take place during the H 3 PO 4 treatment. On the other hands, acid treatment resulted in an increase in the micropore surface area and volume of the zeolite. Specific surface area of the zeolitic tuff (19 m 2 /g) was increased up to 213 m 2 /g, 236 m 2 /g, 202 m 2 /g, 118 m 2 /g with HCl, HNO 3 , H 2 SO 4, and H 3 P O 4 treatments, respectively. In the cases of HCl and HNO 3 , an increase in their concentration furthermore than 5 M caused to the collapse of the structure.