Preparation and water vapor adsorption performance of short-channel mesoporous silica

Abstract

Under the condition of high-speed stirring, the external stress of the molecular assembly process was adjusted to prepare short-channel, rod-shaped ordered mesoporous silica. The effect of different template removal methods on the water vapor adsorption performance of mesoporous silica was studied, and the enhancement method of mesoporous silica adsorption performance was obtained. The method of mesoporous silica adsorption performance. The results show that the short-channel (500-700 nm), rod-shaped mesoporous silica can be prepared, and the temperature at which the templating agent is removed during the preparation process has a greater impact on the surface hydroxyl concentration of the material. The combination of extraction and low-temperature calcination is selected to remove the template, the material obtained by extracting 4 times, calcining 250 ℃ has the best water vapor adsorption performance. Under the experimental conditions, the equilibrium adsorption time is about 7.5 min, which is 78.95% of the commercial SBA-15, and the equilibrium adsorption capacity of 0.73 g·g-1 is 1.49 times of the commercial SBA-15.

Keywords

• mesoporous silica
• low-temperature calcination
• adsorption performance
• template removal method