Balci Suna
Faculty of Engineering and Architecture, Department of Chemical Engineering, Gazi University, 06570 Maltepe, Ankara, Turkey.
Water Res. 2004 Mar;38(5):1129-38. doi: 10.1016/j.watres.2003.12.005.
Adsorption isotherms for an ammonium ion-sepiolite system have been established for initial ammonium ion solution concentrations in the range of 8.32-388.06 mmol NH(4)(+)/L (150-7000 ppm). The change of the "g sepiolite/mL solution" ratios from 1/10 to 1/70 caused an increase in the adsorption from 1.82 to 3.70 mmol NH(4)(+)/g for the average particle size of 2.8mm. The equilibrium data were fitted to "general-purpose isotherms" and "first-order adsorption model", and the adjustable parameters of the isotherms were estimated by nonlinear least-squares analysis. Langmuir and Freundlich models were found insufficient to explain the adsorption equilibrium, while Langmuir-Freundlich and Tooth isotherms explained the data well. Goodness of fit increased with the increased sepiolite quantity in the treated suspension.
已建立了铵离子-海泡石体系的吸附等温线，初始铵离子溶液浓度范围为8.32 - 388.06 mmol NH₄⁺/L（150 - 7000 ppm）。对于平均粒径为2.8mm的情况，“海泡石克数/毫升溶液”的比例从1/10变为1/70，导致吸附量从1.82 mmol NH₄⁺/g增加到3.70 mmol NH₄⁺/g。将平衡数据拟合到“通用等温线”和“一级吸附模型”，并通过非线性最小二乘法分析估计等温线的可调参数。发现朗缪尔和弗伦德利希模型不足以解释吸附平衡，而朗缪尔-弗伦德利希等温线和图思等温线能很好地解释数据。拟合优度随处理悬浮液中海泡石量的增加而提高。
