Recyclable Capture and Destruction of Aqueous Micropollutants Using the Molecule-Specific Cavity of Cyclodextrin Polymer Coupled with KMnO4 Oxidation
Recyclable Capture and Destruction of Aqueous Micropollutants Using the Molecule-Specific Cavity of Cyclodextrin Polymer Coupled with KMnO4 Oxidation
复制标题
利用环糊精聚合物的分子特异性空腔结合 KMnO4 氧化来可回收地捕获和破坏水体微污染物
DOI：
10.1021/acs.est.5b01734
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发表时间：
2015-08-04
影响因子：
11.4
通讯作者：
Chen, Jingwen
中科院分区：
文献类型：
--
作者：
Cai, Xiyun;Liu, Qingquan;Chen, Jingwen
由于天然水成分的干扰，水中微污染物的去除仍然具有挑战性，而天然水成分的浓度通常高3-9个数量级。环糊精具有分子识别功能，在分离催化等领域有着广泛的应用，是发展污染物处理技术的一种很有前途的材料。在这里，我们描述了环糊精聚合物(CDP)吸附和KMnO4氧化的简单集成，用于可循环捕获和破坏水中微污染物(即抗生素和TBBPA)。在固液比为1：1250时，CDP对14种污染物的吸附效率分别为50.0 ng/L和50.0µg/L，吸附效率分别为0.81~88%和0.81~94%。模拟或天然水组分(例如，镁、钙、DOC及其组合)的存在不会降低CDP对这些污染物的吸附潜力，因为根据分子专一性，这些污染物被困在CD腔中。随后的KMnO4氧化完全降解了残留的污染物，表明污染物可以在空腔中被分解。原始的CDP被重新排列成结构疏松的复合材料，该复合材料具有多孔的CDP结构，均匀地嵌入了增量-MnO2纳米粒子，并且具有不同的吸附效率。Delta-MnO2负荷量是积分过程重复次数的线性函数，这是准确控制CDP循环的基础。因此，该方法可能代表了一种去除水中微污染物的新方法。
The removal of aqueous micropollutants remains challenging because of the interference of natural water constituents that are typically 3-9 orders of magnitude more concentrated. Cyclodextrins, which feature molecular recognition and are widely applied in separation and catalysis, are promising materials in the development of pollutant treatment technologies. Here, we described the facile integration of cyclodextrin polymer (CDP) adsorption and KMnO4 oxidation for recyclable capture and destruction of aqueous micropollutants (i.e., antibiotics and TBBPA). CDP exhibited adsorption efficiencies of 0.81-88% and 0.81-94% toward 14 pollutants at 50.0 ng/L and 50.0 mu g/L, respectively, at a solid-to-liquid ratio of 1:1250. The presence of simulated or natural water constituents (e.g., Mg2+, Ca2+, DOC, and a combination thereof) did not decrease the adsorption potential of CDP toward these pollutants because the pollutants, based on molecular specificity, were entrapped in the CD cavity. Subsequent KMnO4 oxidation completely degraded the retained pollutants, demonstrating that the pollutants could be broken down in the cavity. Pristine CDP was rearranged into the structurally loose composites that featured a porous CDP architecture with uniform embedment of delta-MnO2 nanopartides and different adsorption efficiencies. delta-MnO2 loading was a linear function of the number of times the integrated procedure was repeated, underlying the accurate control of CDP recycling. Thus, this approach may represent a new method for the removal of aqueous micropollutants.