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 Uptake of Cd(II) ions by natural phillipsite tuff was investigated both in shake-flask and fixed-bed columns. Equilibrium uptake, qe, was found to best fit Langmuir adsorption isotherm with a maximum value of 25.78 mg/g. Percent removal of Cd ions was close to 100% from initial metal ion concentrations in the range 50 - 75 mg/L at 5.0 g zeolite/L. Also, qe was found to vary exponentially with zeolite dose. Break points as high as 350 minutes were obtained from bed treatment at favorable conditions of a low solution flow rate and high bed depth. In batch experiments, equilibrium pH increased to < 8.0 excluding chemical precipitation as part of the removal while in fixed-beds the final pH exceeded 9.0. It is suggested that a sieve action of zeolite porous structure plays a role as an uptake mechanism in addition to the ion exchange.



Metal uptake Ion exchange Cadmium Adsorption isotherms Fixed-bed column Natural Zeolite Jordan

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LMarashdeh, L. M., & Al-Haj-Ali, A. M. (2009). Uptake of Cd(II) Using Natural Zeolite: Batch and Continuous Fixed-Bed Studies. The Journal of Engineering Research [TJER], 6(2), 1–11.


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