NMR Revealed Activated Alumina-Water Interaction

Three different spin-lattice relaxation times ( T1 ) of water were obtained in activated alumina-water slurry system, which indicate that there exist three states of water: bound water, pore water and bulk water. The chemical shift (δ11) decreases as the amount of water added to the system increases due to the differences in contribution of these three states of water in the samples. The δ11 value for adsorbed water decreases nearly linearly and T1 increases with elevating temperature, which result from the decrease in the content of bound water by the increase in thermal motion.

NMR revealed activated alumina-water interaction

Three different spin-lattice relaxation times (T ₁) of water were obtained in activated alumina-water slurry system, which indicate that there exist three states of water: bound water, pore water and bulk water. The chemical shift (δ _H) decreases as the amount of water added to the system increases due to the differences in contribution of these three states of water in the samples. Theδ _H value for adsorbed water decreases nearly linearly andT ₁ increases with elevating temperature, which result from the decrease in the content of bound water by the increase in thermal motion. Foundation item: Supported by the National Natural Science Foundation of China (20171035) Biography: ZHOU Rui (1977-), female, Master, research direction: surface chemistry.