摘要
采用AP-HNO3组成的体系在低温(100℃左右)下快速完全地分解介孔氧化硅材料(SBA-15)的模板剂,得到开放孔道的SBA-15(N-SBA-15)。透射电镜(TEM)照片显示,N-SBA-15具有高度有序的二维六方结构(p6 mm)。与焙烧产物(C-SBA-15)的孔容(1.03cm3.g-1)和孔径(6.5nm)相比,N-SBA-15具有较大的孔容(1.40cm3.g-1)和孔径(10.4nm)。小角XRD谱图表明N-SBA-15没有明显的骨架收缩,红外光谱(FT-IR)显示其孔道表面存在大量硅羟基。与C-SBA-15相比,N-SBA-15只有很少的微孔孔容。因此,AP氧化是一种条件温和的获取高质量多孔氧化硅阵列材料的有效手段,它也适用于多种具有不同对称性介孔氧化硅(如Fm3 m,Im3 m,Ia3d等结构)模板剂的脱除。
Oxidation of ammonium perchlorate （AP） was used to remove organic templates of ordered mesoporous materials at relatively low temperature （100 ℃）. SBA-15 prepared by using triblock copolymers P123 as a template was chosen as an example to demonstrate the AP-HNO3 treatment method. The resultant template-free product （N-SBA-15） had a larger pore size （10.4 nm） and volume （1.40 cm3 . g^-1） compared to the calcined sample （6.5 nm and 1.03 cm^3 . g^-1）. The IR spectrums show that N-SBA-15 has a high concentration of surface silanol groups. No framework shrinkage is observed based on XRD results. TEM images show that N-SBA-15 has a highly ordered two-dimensional hexagonal structure （p6mm）. Moreover, N-SBA-15 shows almost no micropore volumes. Therefore, high quality N-SBA-15 can easily be obtained under mild conditions. This strategy can also be extended to prepare other template-free mesoporous silicas, such as those with space groups of Fm3m, Im3m, and la3d.
出处
《含能材料》
EI
CAS
CSCD
北大核心
2013年第2期257-261,共5页
Chinese Journal of Energetic Materials
基金
国家自然科学基金资助(11172275)
关键词
物理化学
高氯酸铵(AP)
氧化
介孔氧化硅
模板剂
physical chemistry
ammonium perchlorate
oxidation
mesoporous silicas
organic templates
