In this study surfactant-modified natural bentonite was examined for the adsorption of bisphenol A [2,2-bis(4-hydroxyphenyl)propane; BPA] from aqueous solutions. Batch experiments were performed to investigate the adsorption kinetics, equilibrium and thermodynamics between the adsorbent surfaces and BPA. At acidic pH conditions, removal of BPA was increased due to a neutral molecule form of BPA and hydrophobic surface created by the loaded surfactant molecules. The adsorption of BPA on modified bentonite was enhanced when the ionic strength was increased. The adsorption behavior of BPA onto surfactant-modified bentonite followed the pseudo-second order kinetic model. Langmuir isotherm provided the best fit for adsorption. The adsorption of BPA on modified bentonite is more favorable at lower temperature. According to the experimental results, a physical adsorption is responsible mechanisms for adsorption of BPA on modified bentonite.

中文翻译：

---

表面活性剂改性膨润土从水溶液中去除双酚

在这项研究中，研究了表面活性剂改性的天然膨润土对双酚A [2,2-双（4-羟苯基）丙烷的吸附；BPA]。进行批处理实验以研究吸附剂表面和BPA之间的吸附动力学，平衡和热力学。在酸性pH条件下，由于中性分子形式的BPA和负载的表面活性剂分子产生的疏水性表面，BPA的去除率增加了。当离子强度增加时，BPA在改性膨润土上的吸附作用增强。BPA在表面活性剂改性膨润土上的吸附行为遵循拟二级动力学模型。Langmuir等温线最适合吸附。在较低的温度下，BPA在改性膨润土上的吸附更有利。根据实验结果，