Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, 250100 Jinan, PR China.
J Environ Manage. 2010 Jul;91(7):1601-11. doi: 10.1016/j.jenvman.2010.03.001. Epub 2010 Apr 1.
The adsorption properties and mechanisms of a cationic-polymer/bentonite complex (EPI-DMA/bentonite), prepared from polyepicholorohydrin-dimethylamine and bentonite, for non-ionic dyes (Disperse Blue SBL and Vat Scarlet R) and anionic dyes (Reactive Violet K-3R and Acid Dark Blue 2G) were investigated in this study. The solution pH, presence of salt and surfactant can significantly affect the dye removal efficiency. The equilibrium data were analyzed using the Langmuir and Freundlich models. The Langmuir model is the most suitable to describe non-ionic dye adsorption, but for anionic dyes the Freundlich model is best. The kinetic data for the adsorption of different dyes were analyzed using pseudo first- and second-order equations, and the experimental data conformed to the pseudo second-order kinetic model better. The possibility of intraparticle diffusion was also examined by using the intraparticle diffusion equation. The single-stage batch adsorber design for the adsorption of both types of dyes onto EPI-DMA/bentonite was studied based on the Langmuir isotherm model for non-ionic dyes and the Freundlich isotherm model for anionic dyes. The results showed that the required amount of EPI-DMA/bentonite for 95% dye removal in 5 L dye solution with a concentration of 50 mg/L is 378.0 g for DB SBL, 126.5 g for VS R, 9.7 g for RV K-3R and 15.5 g for ADB 2G.
本文研究了阳离子聚合物/膨润土复合物(EPI-DMA/膨润土)对非离子染料(分散蓝 SBL 和还原红 S)和阴离子染料(活性艳红 K-3R 和酸性深蓝 2G)的吸附性能和机制。该复合物由聚表氯醇-二甲胺和膨润土制备。溶液 pH 值、盐和表面活性剂的存在会显著影响染料去除效率。通过Langmuir 和 Freundlich 模型对平衡数据进行了分析。Langmuir 模型最适合描述非离子染料的吸附,但对于阴离子染料,Freundlich 模型是最佳的。采用拟一级和拟二级动力学方程对不同染料的吸附动力学数据进行了分析,实验数据更符合拟二级动力学模型。还通过内扩散方程考察了内扩散的可能性。根据非离子染料的 Langmuir 等温线模型和阴离子染料的 Freundlich 等温线模型,研究了单级间歇吸附器在 EPI-DMA/膨润土上吸附两种类型染料的设计。结果表明,在 5 L 浓度为 50 mg/L 的染料溶液中,要去除 95%的染料,需要 378.0 g 的 EPI-DMA/膨润土去除 DB SBL,126.5 g 的 VS R,9.7 g 的 RV K-3R 和 15.5 g 的 ADB 2G。