Li Qian, Yue Qin-Yan, Su Yuan, Gao Bao-Yu, Fu Lin
School of Environmental Science and Engineering, Shandong University, Jinan 250100, Shandong, PR China.
J Hazard Mater. 2007 Aug 17;147(1-2):370-80. doi: 10.1016/j.jhazmat.2007.01.024. Epub 2007 Jan 12.
In this study, the cationic polyelectrolyte polyepicholorohydrin-dimethylamine (EPI-DMA) was intercalated into bentonite using ultrasonic. The structure of EPI-DMA/bentonite and its adsorption of Reactive Blue K-GL (RB K-GL) dye were investigated. Compared with raw bentonite, the EPI-DMA/bentonite had larger interlayer spacing and was more hydrophobic, providing with better surface properties for adsorption. The adsorption of RB K-GL on EPI-DMA/bentonite was described by the adsorption models of Langmuir, Freundlich and Dubinin-Radushkevic. The adsorption kinetics was analyzed using pseudo-first- and second-order kinetic models and intraparticle diffusion model. Results showed that both the intraparticle diffusion and first-order adsorption occur in the initial period of adsorption, and that pseudo-second-order kinetic model was more suitable for describing the whole adsorption process. The reaction rates were also calculated. The changes of free energy, enthalpy and entropy of adsorption were evaluated for the adsorption of RB K-GL onto EPI-DMA/bentonite, suggesting that the adsorption process was spontaneous and exothermic.
在本研究中，使用超声波将阳离子聚电解质聚环氧氯丙烷-二甲胺（EPI-DMA）插层到膨润土中。研究了EPI-DMA/膨润土的结构及其对活性蓝K-GL（RB K-GL）染料的吸附性能。与原始膨润土相比，EPI-DMA/膨润土具有更大的层间距且疏水性更强，为吸附提供了更好的表面性质。用Langmuir、Freundlich和Dubinin-Radushkevic吸附模型描述了RB K-GL在EPI-DMA/膨润土上的吸附。使用准一级和二级动力学模型以及颗粒内扩散模型分析了吸附动力学。结果表明，在吸附初期颗粒内扩散和一级吸附均发生，且准二级动力学模型更适合描述整个吸附过程。还计算了反应速率。评估了RB K-GL在EPI-DMA/膨润土上吸附的自由能、焓和熵的变化，表明吸附过程是自发的且放热的。
