Uptake of Cd(II) Using Natural Zeolite: Batch and Continuous Fixed-Bed Studies

Luna M. LMarashdeh, Ahmad M. Al-Haj-Ali


 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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DOI: http://dx.doi.org/10.24200/tjer.vol6iss2pp1-11


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