Department of Inorganic Chemistry, Faculty of Chemistry, Marie Curie-Sklodowska University, 20-031 Lublin, Poland.
J Hazard Mater. 2009 Dec 15;172(1):289-97. doi: 10.1016/j.jhazmat.2009.07.007. Epub 2009 Jul 8.
The sorption of SPANDS from aqueous solution onto the macroporous polystyrene anion exchangers of weakly basic Amberlyst A-21 and strongly basic Amberlyst A-29 in a batch method was studied. The effect of initial dye concentration and phase contact time was considered to evaluate the sorption capacity of anion exchangers. Equilibrium data were attempted by various adsorption isotherms including the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models. A comparison of kinetic models applied to the adsorption rate constants and equilibrium sorption capacities was made for the Lagergren first-order, pseudo second-order and Morris-Weber intraparticle diffusion kinetic models. The results showed that the adsorption isotherm is in the good agreement with the Langmuir equation and that the adsorption kinetics of SPADNS on both anion exchangers can be best described by the pseudo second-order model.
采用间歇法研究了 SPANDS 在大孔弱碱性 Amberlyst A-21 和强碱性 Amberlyst A-29 阴离子交换树脂上从水溶液中的吸附。考察了初始染料浓度和相接触时间对阴离子交换树脂吸附能力的影响。通过Langmuir、Freundlich 和Dubinin-Radushkevich（D-R）等多种吸附等温线模型对平衡数据进行了尝试。对 Lagergren 一级、拟二级和Morris-Weber 颗粒内扩散动力学模型的吸附速率常数和平衡吸附容量进行了比较。结果表明，吸附等温线与 Langmuir 方程吻合较好，SPADNS 在两种阴离子交换树脂上的吸附动力学可以用拟二级模型最好地描述。
