Tsai Wen-Tien, Hsu Hsin-Chieh, Su Ting-Yi, Lin Keng-Yu, Lin Chien-Ming
Department of Environmental Engineering and Science, Chia Nan University of Pharmacy and Science, Tainan 717, Taiwan.
J Colloid Interface Sci. 2006 Jul 15;299(2):513-9. doi: 10.1016/j.jcis.2006.02.034. Epub 2006 May 2.
The adsorption behavior of bisphenol-A, which is a hydrophobic organic compound and also listed as one of endocrine disrupting chemicals, from aqueous solution onto hydrophobic zeolite at 25 degrees C have been studied using a batch adsorption process in terms of a pseudo-second-order equation and three common isotherms (i.e., the Langmuir, Freundlich, and Redlich-Peterson). The pore properties of the Y-type zeolite have been determined using N2 adsorption-desorption isotherms, indicating that it is a supermicroporous adsorbent associated with a lower percentage of mesopores. Based on the kinetic model the effects of particle size, initial bisphenol-A concentration, initial solution pH, and adsorbent dosage on the adsorption rate constant and equilibrium capacity have been estimated, showing that the adsorption process could be simulated well by the simplified kinetic model. From the data on the equilibrium adsorption capacities obtained by fitting the pseudo-second-order model, the adsorption isotherm could be better described by the three-parameter Redlich-Peterson model than by the two-parameter models (i.e., the Langmuir and Freundlich).
双酚A是一种疏水性有机化合物，也是内分泌干扰化学物质之一。在25℃下，采用间歇吸附法，根据拟二级方程和三种常见等温线（即朗缪尔等温线、弗伦德里希等温线和雷德利希-彼得森等温线），研究了双酚A从水溶液到疏水性沸石上的吸附行为。利用N2吸附-脱附等温线测定了Y型沸石的孔性质，表明它是一种超微孔吸附剂，中孔百分比较低。基于动力学模型，估计了粒径、双酚A初始浓度、初始溶液pH值和吸附剂用量对吸附速率常数和平衡容量的影响，结果表明简化的动力学模型能很好地模拟吸附过程。根据拟合拟二级模型得到的平衡吸附容量数据，与双参数模型（即朗缪尔模型和弗伦德里希模型）相比，三参数雷德利希-彼得森模型能更好地描述吸附等温线。
