School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO 2434, Brisbane, Queensland 4001, Australia.
School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, GPO 2434, Brisbane, Queensland 4001, Australia; School of Chemical and Environmental Engineering, China University of Mining and Technology, Beijing 100083, PR China.
Chemosphere. 2014 Jul;107:249-256. doi: 10.1016/j.chemosphere.2013.12.050. Epub 2014 Jan 7.
Remediation of bisphenol A (BPA) from aqueous solutions by adsorption using organoclays synthesized from montmorillonite (MMT) with different types of organic surfactant molecules was demonstrated. High adsorption capacities of the organoclays for the uptake of BPA were observed and these demonstrated their potential application as strong adsorbents for noxious organic water contaminants. The adsorption of BPA was significantly influenced by pH, with increased adsorption of BPA in acidic pH range. However, the organoclays intercalated with highly loaded surfactants and/or large surfactant molecules were less influenced by the pH of the environment and this was thought to be due to the shielding the negative charge from surfactant molecules and the development of more positive charge on the clay surface, which leads to the attraction of anionic BPA even at alkaline pH. The hydrophobic phase created by loaded surfactant molecules contributed to a partitioning phase, interacting with BPA molecules strongly through hydrophobic interaction. Pseudo-second order kinetic model and Langmuir isotherm provided the best fit for the adsorption of BPA onto the organoclays. In addition, the adsorption process was spontaneous and exothermic with lower temperature facilitating the adsorption of BPA onto the organoclays. The described process provides a potential pathway for the removal of BPA from contaminated waters.
采用不同类型有机表面活性剂分子合成的有机黏土对水溶液中的双酚 A（BPA）进行吸附，从而修复 BPA。观察到有机黏土对 BPA 的高吸附容量，这表明它们有潜力作为去除有害有机水污染物的强力吸附剂。BPA 的吸附受 pH 值影响显著，在酸性 pH 值范围内吸附量增加。然而，层间插入高负载表面活性剂和/或大表面活性剂分子的有机黏土受环境 pH 值的影响较小，这被认为是由于表面活性剂分子的负电荷被屏蔽以及黏土表面正电荷的发展，导致即使在碱性 pH 值下也能吸引阴离子 BPA。负载表面活性剂分子所形成的疏水性相有助于分配相，通过疏水性相互作用与 BPA 分子强烈相互作用。准二级动力学模型和 Langmuir 等温线为 BPA 吸附到有机黏土上提供了最佳拟合。此外，吸附过程是自发的和放热的，较低的温度有利于 BPA 吸附到有机黏土上。该方法为从受污染水中去除 BPA 提供了一种潜在途径。
