论文部分内容阅读
采用高转速的1H魔角旋转核磁共振技术, 成功分辨了硅藻土表面不同类型的羟基: 孤立羟基、氢键缔合羟基, 以及表面吸附的孔隙水和氢键结合水. 其质子的化学位移(δ)分别约为2.0, 6.0~7.1, 4.9和3.0. 随热处理温度逐渐升高, 孔隙水、氢键结合水先后脱附, 导致代表孤立羟基质子、氢键缔合羟基质子的谱峰的相对强度增加, 1000℃时达到最大. 1100℃时, 强氢键缔合羟基、孤立羟基基本缩合, 弱氢键缔合羟基则仍有部分保留于微孔之中.
Using high-speed 1H Magic Rotation Rotation Nuclear Magnetic Resonance (NMR) technology, different types of hydroxyl groups on the surface of diatomite were successfully resolved: isolated hydroxyl groups, hydrogen-bonded hydroxyl groups and pore-surface adsorbed pore water and hydrogen-bonded water. The proton chemical shifts (δ) were about 2.0, 6.0 ~ 7.1, 4.9 and 3.0, respectively.With the increase of heat treatment temperature, pore water and hydrogen bonding water desorbed one after the other, resulting in the separation of protonated hydroxyl protons and hydrogen protons The relative intensities increased to reach the maximum at 1000 ° C. At 1100 ° C, the strong hydrogen bonds associate with the hydroxyl groups and the isolated hydroxyl groups are substantially condensed, while the weak hydrogen bonds with the hydroxyl groups remain partially in the pores.