Water-soluble metallic organic molecular cage-based polydimethylsiloxane composite membrane and preparation method thereof

Abstract

The invention relates to a water-soluble metallic organic molecular cage-based polydimethylsiloxane composite membrane and a preparation method thereof, and belongs to the field of membrane separation techniques and high and new techniques. The preparation method of the membrane comprises the following technological steps: (1), the preparation of a membrane-making pre-emulsion: uniformly mixing polydimethylsiloxane, metallic organic molecular cages, a surfactant and water at 25 DEG C, so as to subsequently form the membrane-making pre-emulsion; (2), the formation of filled polymer composite membrane in a thermal cross-linking manner: adding a cross-linking agent and a catalyst into membrane-making material liquid, agitating an obtained mixture at 25 DEG C, defoaming the agitated membrane-making material liquid in a vacuum manner, then coating a polyvinylidene fluoride ultrafiltration membrane with the defoamed membrane-making material liquid, putting the polyvinylidene fluoride ultrafiltration membrane in a baking oven to cure the defoamed membrane-making material liquid until the cross linking is complete. As the water-soluble metallic organic molecular cages are uniformly distributed in the membrane, the composite membrane prepared by adopting the method provided by the invention is good in penetrating quality to organic vapor, and is high in the separation factor to organic vapor / nitrogen by hydrophobic inner cavities and the regulation and the control on spaces among chains of the membrane of the water-soluble metallic organic molecular cages.

Description

technical field

[0001] The invention relates to a polydimethylsiloxane composite membrane based on a water-soluble metal organic molecular cage and a preparation method thereof, belonging to the technical field of membrane separation. Background technique

[0002] Volatile organic compounds (Volatile Organic Compounds, VOCs) are ubiquitous and complex organic pollutants in the air, causing great harm to the environment, the growth of animals and plants, and human health. Carrying out research on high-efficiency VOCs removal technology will have extremely important theoretical significance and application value for solving the increasingly serious regional air pollution, maintaining human health, and improving resource utilization. VOCs removal technology first requires high efficiency and low energy consumption, followed by simple process and easy operation and maintenance. At present, the treatment methods of VOCs mainly include incineration, photocatalytic oxidation, abso...