短通道介孔二氧化硅的制备与水蒸气吸附性能

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

在高速搅拌条件下调整分子组装过程的外界应力,制备出短通道(500~700 nm)、条棒状的有序介孔二氧化硅,研究不同模板剂脱除方式对介孔二氧化硅的水蒸气吸附性能影响,获得强化介孔二氧化硅吸附性能的方法。结果表明:在短通道、条棒状介孔二氧化硅的制备过程中模板剂脱除的温度对材料表面羟基浓度影响较大,选择萃取与低温煅烧相结合方法脱除模板剂,萃取4次,250℃煅烧脱除模板剂的材料水蒸气吸附性能最好,在实验条件下平衡吸附时间约为7.5 min,是商品SBA-15的78.95%;平衡吸附量0.73 g·g^(-1),是商品SBA-15的1.49倍。

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.