乳液模板法制备环糊精基多孔材料及其吸附挥发性有机物的应用研究

Emulsion-templated cyclodextrin-based porous materials for volatile organic compounds adsorption

摘要:

吸附法是消除挥发性有机物(VOCs)污染最为有效的方法之一。本工作以二甲基亚砜包液体石蜡的非水高内相乳液(HIPEs)为模板,利用连续相中环糊精参与的逐步聚合,获得了环糊精基多孔吸附材料(CD-PMs),实现多种VOCs的高效吸附。研究了环糊精的种类和用量对HIPEs的形貌和流变行为的影响,进而分析了相应环糊精基多孔吸附材料表观密度、孔隙结构和贯通孔形貌的变化规律。所制CD-PMs力学强度好,并且对包括甲苯和乙醛在内的多种VOCs具备高的吸附能力。研究发现,CD-PMs物理吸附甲苯,重复使用10次也能保持较高的吸附能力；并且其分子网络能与乙醛产生化学键合,获得极高的吸附量。本工作为制备一类高效VOCs吸附材料提供可能,并且原料来源生物质,契合可持续发展的需求。

Abstract:

Adsorption is an efficient strategy to remove volatile organic compound (VOC) pollutants. Herein, a series of cyclodextrin-based porous materials (CD-PMs) were fabricated from a dimethylsulfoxide (DMSO)-in-paraffin oil high internal phase emulsion (HIPE) through the step-growth polymerization. Morphologies and rheological behaviors of the original HIPEs were controlled by cyclodextrin’s types and contents. Subsequently, the apparent density, porous structure, and pore throat of the corresponding CD-PMs were variegated under a similar law. The resultant CD-PMs exhibited robust mechanical properties and high adsorption capacities of various VOCs, i.e., toluene and acetaldehyde. Moreover, CD-PMs removed the toluene through a physical adsorption process which could keep a high absorption capacity even after reused for 10 cycles. In the case of acetaldehyde, the CD-PMs absorbed it via chemical adsorption, resulting in a remarkable absorption capacity. These CD-PMs are perfect VOCs adsorbents from renewable resources, meeting the sustainable development.