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With glacial acetic acid In acetonitrile at 20℃; for 72h;
2.2. Preparation of COF
10 mL of acetonitrile containing 22.3 mg DVA and 28.1 mg TPB were added to the glass flask. First, the solid was completely dissolved by ultrasound. Next, CH3COOH (0.7 mL 12 M) was added to the above mixed solution. After the above mixture was homogenized by oscillation, an amount of yellow precipitate appeared in the mixed solution.The mixed solution was carried out at room temperature for 3days. After the reaction was completed, the yellow precipitates were separated by centrifugation. Then, the yellow precipitates were washed 3 times with tetrahydrofuran (THF) and ethanol, respectively. Finally, the yellow precipitates were dried in vacuum condition at 40 °C for overnight.