席夫碱桥联介孔SiO_2的合成及其对Cu^(2+)吸附性能的研究

Synthesis of Schiff-base periodic mesoporous silica and its performance for Cu^(2+) adsorption

采用水热法,以十二胺为模板剂,苯基桥链硅氧烷为有机硅源的共缩聚法合成桥链双亚胺席夫碱功能介孔二氧化硅(PMOs),并利用FT-IR,XRD,N_2吸附/脱附及TEM对合成的样品进行表征,考察了桥联有机硅源量对PMOs材料结晶和介孔结构特性的影响。结果显示,通过苯基桥链硅氧烷为有机硅源可实现介孔二氧化硅的席夫碱功能化,样品的孔径为2.65~2.96nm的介孔结构范围。但随着桥联有机硅源量的增加,受有机结构的影响,PMOs材料的晶型有序度和介孔规整度下降。吸附性能显示,PMOs材料对Cu^(2+)具有较好的吸附性能,对铜离子(Cu^(2+))的最高吸附率达到90.35%。

Series of phenyl-periodic mesoporous organosilicas were synthesized by the hydrolytic condensation,using dodecyl amine as template,Schiff-base bridged siloxanes as organic silicon source.The PMOs materials were characterized by FT-IR,XRD,TEM and N_2 adsorption/desorption isotherms,and the effect of bridging organic silicon quantity on the crystallization and mesoporous structure of PMOs materials were investigated.The results showed that Schiff-base functional mesoporous silica could be prepared by phenyl siloxane chain bridge for organic silicon source,and the pore size distribution of samples was in the range of 2.65 to 2.96 nm.But with the increase of bridging organic silicon,because of the influence of organic structure,crystal and mesoporous structure degree of PMOs materials declined.For the adsorption performance,the PMOs material had good adsorption characterization for Cu^2＋,90.35% of Cu^2＋ adsorption rate could be obtained.