铜对地聚合物化学结构的影响

Effect on Chemical Structure of Geopolymer by Copper

关键词:  地聚合物  铜  化学结构

Key words:  geopolymer  copper  chemical structure

摘要:

借助X射线衍射(XRD)、扫描电镜能谱(SEM EDS)、红外光谱(FTIR)、核磁共振（NMR）等技术，研究了铜对地聚合物化学结构的影响.地聚合物由硅粉、偏高岭土、氢氧化钾和水制得，铜以硝酸盐的形式加入.结果表明：加入的铜影响到地聚合物化学结构中Al—O—Si键和Si—O—Si 键的周围气氛，使其振动频率发生微小变化，也影响到Al和Si原子核周围的电子密度，使27Al NMR和29Si NMR特征峰发生微小偏移，但加入的铜没有改变地聚合物中化学键振动模式，也没有引起硅氧四面体、铝氧四面体结构单元和两者之间键接方式的变化.

Abstract:

X ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy energy dispersive spectromete and nuclear magnetic resonance were used to study the effect on chemical structure of geopolymer by copper. Geopolymer was prepared from silicon fume, metakaolin, potassium hydroxide and water. Copper was added into geopolymer in the form of nitrate. Vibration frequencies of Al—O—Si chemical bond and Si—O—Si chemical bond were slightly affected by copper. Chemical shifts in 27Al NMR and 29Si NMR spectra were slightly affected, however, vibration modes of chemical bonds, tetrahedron units and their inter linkage types were not affected by copper.