Li Qian, Yue Qin-Yan, Su Yuan, Gao Bao-Yu, Li Jing
School of Environmental Science and Engineering, Shandong University, Jinan, Shandong, PR China.
J Hazard Mater. 2009 Jun 15;165(1-3):1170-8. doi: 10.1016/j.jhazmat.2008.10.110. Epub 2008 Nov 5.
The adsorption kinetics of two reactive dyes, namely, Reactive Blue K-GL and Reactive Yellow K-4G onto the new cationic polymer/bentonite, i.e., polyepicholorohydrin-dimethylamine/bentonite (EPI-DMA/bentonite), were studied under different conditions. The result indicated that the adsorption processes were found to follow the two-step kinetic rate equation with two different adsorption rate constants (k(1) and k(2)) and also to follow the intraparticle diffusion model with two different diffusion rate constants (k(int,1) and k(int,2)). The corresponding values of energies of activation of adsorption, enthalpies of activation and entropies of activation for both the two adsorption kinetic steps have been calculated, suggesting that the adsorption processes were endothermic and physical. The desorption kinetics of two dyes from EPI-DMA/bentonite were studied in NaOH solution with different concentrations, which were also found to obey the two-step kinetic rate equation with two different desorption rate constants (k(d,1) and k(d,2)).
研究了两种活性染料，即活性蓝K-GL和活性黄K-4G在新型阳离子聚合物/膨润土，即聚环氧氯丙烷-二甲胺/膨润土（EPI-DMA/膨润土）上在不同条件下的吸附动力学。结果表明，吸附过程遵循具有两个不同吸附速率常数（k(1)和k(2)）的两步动力学速率方程，并且也遵循具有两个不同扩散速率常数（k(int,1)和k(int,2)）的颗粒内扩散模型。计算了两个吸附动力学步骤的吸附活化能、活化焓和活化熵的相应值，表明吸附过程是吸热的且为物理过程。在不同浓度的NaOH溶液中研究了两种染料从EPI-DMA/膨润土上的解吸动力学，发现其也遵循具有两个不同解吸速率常数（k(d,1)和k(d,2)）的两步动力学速率方程。
