Department of Chemical Engineering, New Mexico State University, P.O. Box 30001, MSC 3805, Las Cruces, NM 88003, USA.
J Colloid Interface Sci. 2010 Sep 1;349(1):307-13. doi: 10.1016/j.jcis.2010.05.066. Epub 2010 May 23.
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 N(2)-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 96.23mg/g at fluoride concentrations of 0.99 and 432mg/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.
研究了溶胶-凝胶法制备的活性氧化铝及其与氧化钙或氧化锰改性后的吸附剂对氟离子的吸附平衡和动力学，以探索这些吸附剂从饮用水中去除氟离子的可行性。采用 SEM/EDS 和 N2 吸附对活性氧化铝吸附剂进行了化学和孔结构性质的表征。采用 Langmuir 和 Freundlich 吸附方程对吸附等温线进行了关联。溶胶-凝胶法制备的活性氧化铝上的氟离子吸附等温线符合 Freundlich 模型，而氧化钙或氧化锰改性的活性氧化铝吸附剂上的氟离子吸附等温线符合 Langmuir 模型。氧化钙改性的氧化铝吸附剂在氟离子浓度分别为 0.99 和 432mg/L 时，氟离子的吸附容量最高，分别为 0.99 和 96.23mg/g。拟二级动力学模型和颗粒内动力学模型很好地拟合了吸附动力学数据。结果表明，外部和颗粒内扩散都有助于从实验室制备的基于活性氧化铝的吸附剂中去除氟离子。本工作评估的吸附动力学模型很好地拟合了从墨西哥地下水中去除氟离子的氧化钙和氧化锰改性氧化铝吸附剂的吸附量。
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