A novel crosslinked β-cyclodextrin-based polymer for removing methylene blue from water with high efficiency

In this work, a novel crosslinked porous beta-cyclodextrin-based polymer containing carboxylic acid groups (CT-beta-CD) was synthesized successfully and characterized by SEM, FTIR, C-13 solid-state NMR, water-contact-angle measurement, and TGA. The resultant CT-beta-CD with triple absorption effects including inclusion complextion, porous network capture, and electrostatic interaction was employed as an adsorbent for removing methylene blue dye from aqueous solution, which exhibited several advantages such as high absorption capacity (q(max) = 672 mg/g), rapid absorption rate, good recyclable ability, and selective adsorption for cationic dyes. The influences of initial MB concentration, absorption time, and pH value on the absorption behavior of CT-beta-CD for MB were also investigated. In addition, it was found that the pseudo-second-order kinetic and the Langmuir model for adsorption isotherm could be used to describe the MB absorption behavior of CT-beta-CD.

在这项工作中，成功合成了一种新型的含羧酸基团的交联多孔β - 环糊精基聚合物（CT - β - CD），并通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、碳 - 13固态核磁共振（C - 13 solid - state NMR）、水接触角测量以及热重分析（TGA）对其进行了表征。所得到的CT - β - CD具有三重吸附效应，包括包合作用、多孔网络捕获以及静电相互作用，被用作从水溶液中去除亚甲基蓝染料的吸附剂，它表现出一些优势，例如高吸附容量（最大吸附量q(max)=672 mg/g）、快速的吸附速率、良好的可回收能力以及对阳离子染料的选择性吸附。还研究了初始亚甲基蓝浓度、吸附时间和pH值对CT - β - CD吸附亚甲基蓝行为的影响。此外，发现准二级动力学和吸附等温线的朗缪尔模型可用于描述CT - β - CD对亚甲基蓝的吸附行为。