Facile preparation of cyclodextrin polymer materials with rigid spherical structure and flexible network for sorption of organic contaminants in water
Facile preparation of cyclodextrin polymer materials with rigid spherical structure and flexible network for sorption of organic contaminants in water
复制标题
轻松制备具有刚性球形结构和柔性网络的环糊精聚合物材料用于吸附水中的有机污染物
DOI：
10.1016/j.cej.2021.128489
复制
发表时间：
--
影响因子：
15.1
通讯作者：
Cai Xiyun
中科院分区：
文献类型：
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作者：
Wang Maolin;Li Gengxian;Xia Chunlong;Jing Xudong;Wang Rubing;Liu Qingquan;Cai Xiyun
交联环糊精聚合物（CDP）材料对水中有机污染物具有较高的吸附能力和选择性，这取决于聚合物网络。由于材料制备时聚合反应的放热性质，网络结构难以预测。本文通过对CDP进行kmno4氧化处理，制备了具有刚性体结构和柔性聚合物网络的CDP复合材料。这些材料的特点是纳米棒二氧化锰颗粒在聚合物基体中有规则的嵌入，并且具有机械稳定性，与聚合物网络的短链氧化有关。材料的结构和性能（如交联度、孔体积和CD单位含量）受kmno4用量的调节，其中大部分随氧化剂用量的增加而线性增加或减少。材料的交联度、孔体积和CD单位类型/含量对CDP材料对化合物的吸附能力有重要影响。这些性质的改变导致了吸附位点数量和可及性的降低，与CDP材料吸附机制的重要顺序（缔合络合≥网状络合>包合络合）一致。这种折衷对于制备具有更有用吸附剂性能的CDP材料具有实际意义。所选CDP材料的重复利用实验表明，材料对水中农药的去除效率高，稳定性好。回用材料对水中农药的去除率平均提高22.5%。
Cross-linked cyclodextrin polymer (CDP) materials have high sorption capacity and selectivity toward organic contaminants in water, depending on the polymeric network. The network structure is difficult to predict, due to the exothermic nature of polymerization reactions for material preparation. Here, we prepared CDP composite materials with rigid bulk structure and flexible polymeric network through facile KMnO4oxidation treatments of CDPs. These materials featured regular embedment of nanorod MnO2particles in the polymeric matrix and had mechanical stability, associated with the oxidation of short chains of the polymeric network. The structure and properties of materials (e.g., the cross-linking degree, pore volume and CD unit content) were regulated by KMnO4dosage, the majority of which were linearly increased or decreased with increasing oxidant doses. The cross-linking degree, pore volume and CD unit type/content of materials were found to pose important impacts on sorption capacity of CDP materials toward compounds. These property alterations accounted for a compromise of amounts and accessibility of sorption sites, consistent with the important sequence of sorption mechanisms of CDP materials (association complexation ≥ network meshing ≫ inclusion complexation). This compromise has practical interest in the preparation of CDP materials with more useful properties of sorbents. Reuse experiments of chosen CDP materials showed high removal efficiency and stability of materials toward pesticides in water. Removal efficiency of reused materials toward pesticides in water was increased by an average of 22.5%.