Hydrophilic covalent organic frameworks for oil-water separation and methods of making and using the same

Abstract

This invention relates to a hydrophilic covalent organic framework (COF) for oil-water separation, its preparation method, and its application, belonging to the field of oil-water and emulsion separation technology. Specifically, it relates to a hydrophilic covalent organic framework, its preparation method, and its application. This invention aims to solve the problems of current hydrophilic COFs used for oil-water separation, such as limited structural types, poor hydrophilicity, low water flux, and poor oil-water separation performance. Preparation: 4-(5,10-diamino-1H-phenanthro[9,10-d]imidazol-2-yl)phenol (NH2-PIP(OH)), 2,5-diaminoterephthalic acid (DABD), and 4,4′,4″-[(1,3,5-triazine-2,4,6-triyl)tri(oxy)]tribenzaldehyde were added to a Pyrex tube, followed by organic solvent I and catalyst I. The mixture was heated, cooled, filtered, and the filter cake was collected. The cake was repeatedly washed with organic solvent II, collected, and dried to obtain the final product. This product is used for the separation of the oil and aqueous phases in oil-water mixtures or emulsions. The organic framework exhibits a stable structure, controllable pore size, and excellent hydrophilic properties, enabling efficient oil-water separation.

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