کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
609613 880626 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Adsorption equilibrium and kinetics of fluoride on sol–gel-derived activated alumina adsorbents
چکیده انگلیسی

Adsorption equilibrium and kinetics of fluoride on a sol–gel-derived activated alumina and its modifications with calcium oxide or manganese oxide were studied to explore the feasibility of applying these adsorbents for fluoride removal from drinking water. The activated alumina adsorbents were characterized with SEM/EDS and N2-adsorption for their chemical and pore textural properties. The adsorption isotherms were correlated with the Langmuir and Freundlich adsorption equations. The fluoride adsorption isotherms on the sol–gel-derived activated alumina followed the Freundlich model while the fluoride adsorption isotherms on the calcium oxide- or manganese oxide-modified activated alumina adsorbents followed the Langmuir model. The calcium oxide-modified alumina adsorbent showed the highest fluoride adsorption capacities of 0.99 and 96.23 mg/g at fluoride concentrations of 0.99 and 432 mg/L, respectively. A pseudo-second-order model and an intraparticle kinetic model fitted well the adsorption kinetic data. It was found that both external and intraparticle diffusions contribute to the rate of removal of fluoride from the activated alumina-based adsorbents produced in our laboratory. The adsorption kinetic models evaluated in this work fitted well the adsorption uptake of fluoride from a Mexican groundwater on both calcium oxide- and manganese oxide-modified alumina adsorbents.

Comparison of kinetic model predcitions with experimental data of fluoride removal from a Mexican groundwater using CaO-AA and MnO2-AA.Figure optionsDownload high-quality image (52 K)Download as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 349, Issue 1, 1 September 2010, Pages 307–313
نویسندگان
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