Li Xia, Xie Long, Yang Xuan, Nie Xiaojuan
The Department of Chemistry, School of Science, North University of China Shanxi 030051 PR China
RSC Adv. 2018 Dec 4;8(70):40321-40329. doi: 10.1039/c8ra07709f. eCollection 2018 Nov 28.
Cyclodextrin polymers are efficient adsorbents for dye adsorption. Herein, a β-cyclodextrin polymer (β-CDSP) with carboxyl groups and benzene rings was prepared free radical polymerization of β-cyclodextrin-maleate and styrene. The adsorption performance of β-CDSP was studied by adsorbing neutral red (NR), basic fuchsin (BF) and safranine T (ST) dyes under different adsorption conditions (, adsorption time, temperature and pH of the solution). The results showed that the adsorption of BF and ST was faster and better than that of NR. The adsorption kinetic behavior fitted well with both the pseudo-first-order and the pseudo-second-order models for NR and BF, but it fitted better with the latter for ST. The adsorption equilibrium data followed the Langmuir isotherm model. The adsorption process was endothermic and spontaneous, and a higher temperature was favorable for dye adsorption. Higher values were obtained in a basic medium, which resulted from the electrostatic interactions between β-CDSP and cationic dyes. Furthermore, inclusion complexion and π-π interactions also contributed to the dye adsorption. The stability and reusability of β-CDSP were estimated by four regeneration cycles.
环糊精聚合物是用于染料吸附的高效吸附剂。在此，通过β-环糊精马来酸酯和苯乙烯的自由基聚合制备了一种具有羧基和苯环的β-环糊精聚合物（β-CDSP）。通过在不同吸附条件（吸附时间、温度和溶液pH值）下吸附中性红（NR）、碱性品红（BF）和番红T（ST）染料，研究了β-CDSP的吸附性能。结果表明，BF和ST的吸附比NR更快且更好。NR和BF的吸附动力学行为与伪一级和伪二级模型均拟合良好，但ST与后者拟合得更好。吸附平衡数据遵循朗缪尔等温线模型。吸附过程是吸热且自发的，较高温度有利于染料吸附。在碱性介质中获得了更高的值，这是由于β-CDSP与阳离子染料之间的静电相互作用所致。此外，包合络合和π-π相互作用也有助于染料吸附。通过四个再生循环评估了β-CDSP的稳定性和可重复使用性。
