College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China.
J Hazard Mater. 2011 Jan 30;185(2-3):1073-80. doi: 10.1016/j.jhazmat.2010.10.016. Epub 2010 Nov 1.
Removal of fluoride from aqueous solution using granular acid-treated bentonite (GHB) was studied by batch and column adsorption experiments. The results of the batch adsorption experiments demonstrated that the maximum fluoride removal was obtained at pH of 4.95 and it took 40 min to attain equilibrium. Kinetics data fitted pseudo-second-order model. Batch adsorption data was better described by Redlich-Peterson and Freundlich isotherm models than Langmuir isotherm model. The adsorption type of GHB was ion exchange. Column experiments were carried out at different influent fluoride concentrations and different flow rates. The capacities of the breakthrough and exhaustion points increased with the decrease of flow rate and the increase of initial fluoride concentration. The experimental results were well fitted with Thomas model. Exhausted GHB was regenerated by alkali/alum treatment. The total sorption capacity of GHB was increased after regeneration and activation.
采用批量和柱吸附实验研究了用颗粒酸处理膨润土（GHB）从水溶液中去除氟化物。批量吸附实验的结果表明，在 pH 值为 4.95 时，氟的去除率最大，达到平衡需要 40 分钟。动力学数据符合拟二级模型。与 Langmuir 等温模型相比，Redlich-Peterson 和 Freundlich 等温模型更能描述批量吸附数据。GHB 的吸附类型为离子交换。在不同的入口氟化物浓度和不同的流速下进行了柱实验。穿透点和耗尽点的容量随着流速的降低和初始氟化物浓度的增加而增加。实验结果与 Thomas 模型吻合较好。用过的 GHB 用碱/明矾处理再生。再生和活化后，GHB 的总吸附容量增加。
