Zeolites are an excellent sorbent because of high specific surface area, chemical and mechanical stability, and high cation exchange capacity. In this study, the four natural zeolites collected in Youngil Bay Area, Kyungsangbuk-do, Korea, were characterized by XRD, XRF, DT, TGA and CEC analysis. The...
Zeolites are an excellent sorbent because of high specific surface area, chemical and mechanical stability, and high cation exchange capacity. In this study, the four natural zeolites collected in Youngil Bay Area, Kyungsangbuk-do, Korea, were characterized by XRD, XRF, DT, TGA and CEC analysis. The primary species of the these zeolite are heulandite, modenite mixed clinoptilite and quartz, illite mixed heulandite, clinoptilite and quartz, and illite mixed heulandite, and clinoptilite in kuryongpo, pohang, yangbuk A and B samples, respectively. The XRF analysis showed that the four natural zeolites contained seven elements such as Si, Al, Na, K, Mg, Ca, and Fe. Cation exchange capacity of kuryongpo sample (146.3 meq/100 g) was higher than that of other zeolites due to difference in structures. Adsorption isotherms of Cs and Sr in four natural zeolites were examined at 25 ℃. The amount of sorbed Cs was represented yangbuk A > kuryongpo > yangbuk B > pohang, respectively. It was found that yangbuk A natural zeolite was most efficient in removing Cs+ ions, compared with the other natural zeolites in this work because of the content of hulandite and illite. However, Sorption capacity for Sr was in order of kuryongpo > yangbuk A > pohang > yangbuk B, respectively. On the basis of adsorption data Langmuir and Freundlich adsorption isotherm model were confirmed. The equilibrium process was described well by Adsorption datas were fitted to Langmuir isotherm model. The results of curve fitting showed R2 > 0.97 in all of adsorption models, except Sr2+ adsorption onto yangbuk B. From determined isotherm constants, natural zeolite could be employed as effective treatment for removal of Cs and Sr.
Zeolites are an excellent sorbent because of high specific surface area, chemical and mechanical stability, and high cation exchange capacity. In this study, the four natural zeolites collected in Youngil Bay Area, Kyungsangbuk-do, Korea, were characterized by XRD, XRF, DT, TGA and CEC analysis. The primary species of the these zeolite are heulandite, modenite mixed clinoptilite and quartz, illite mixed heulandite, clinoptilite and quartz, and illite mixed heulandite, and clinoptilite in kuryongpo, pohang, yangbuk A and B samples, respectively. The XRF analysis showed that the four natural zeolites contained seven elements such as Si, Al, Na, K, Mg, Ca, and Fe. Cation exchange capacity of kuryongpo sample (146.3 meq/100 g) was higher than that of other zeolites due to difference in structures. Adsorption isotherms of Cs and Sr in four natural zeolites were examined at 25 ℃. The amount of sorbed Cs was represented yangbuk A > kuryongpo > yangbuk B > pohang, respectively. It was found that yangbuk A natural zeolite was most efficient in removing Cs+ ions, compared with the other natural zeolites in this work because of the content of hulandite and illite. However, Sorption capacity for Sr was in order of kuryongpo > yangbuk A > pohang > yangbuk B, respectively. On the basis of adsorption data Langmuir and Freundlich adsorption isotherm model were confirmed. The equilibrium process was described well by Adsorption datas were fitted to Langmuir isotherm model. The results of curve fitting showed R2 > 0.97 in all of adsorption models, except Sr2+ adsorption onto yangbuk B. From determined isotherm constants, natural zeolite could be employed as effective treatment for removal of Cs and Sr.
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