Adsorption equilibrium and kinetics of fluoride on two synthetic zeolites

Lucy Mar Camacho, Shuguang Deng, Arely Torres

Research output: Chapter in Book/Report/Conference proceedingChapter


Synthetic 4A and 5A zeolites were studied to explore the feasibility of applying these adsorbents for fluoride removal from drinking water. The zeolites were characterized with SEM/EDS and N2-adsorption/desorption for their chemical and pore textural properties. The adsorption isotherms were correlated with the Langmuir and Freundlich adsorption equations. The fluoride adsorption isotherms on synthetic zeolite 4A and 5A followed the Freundlich model. The zeolite 5A adsorbent showed the highest fluoride adsorption capacity. It adsorbed up to 0.1 and 71 mg/g when the fluoride equilibrium concentration in water was 4.0 and 514 mg/L, respectively. Zeolite 5A adsorbed seven times more fluoride than zeolite 4A at the same initial concentration. A pseudo-second order model and an intraparticle kinetic model fitted well the adsorption kinetic data for both synthetic zeolite adsorbents. It was found that both external and intraparticle diffusions contribute to the rate of removal of fluoride by the zeolites. From the experimental data obtained in this work, it was found that synthetic zeolite 5A has potential adsorption properties for fluoride removal from drinking water.

Original languageEnglish (US)
Title of host publicationZeolites
Subtitle of host publicationSynthesis, Chemistry and Applications
PublisherNova Science Publishers, Inc.
Number of pages14
ISBN (Print)9781619428614
StatePublished - Aug 2012
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)


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