In this experiment, magnesium nitrate and aluminum nitrate were first dissolved in water to form a clear solution. The solution's pH was then adjusted by adding sodium hydroxide and maintained at a specific pH value. Next, the solution was thoroughly stirred at room temperature for 2 minutes, and then placed in a high-pressure reactor to react for 24 hours under conditions of 100°C and 150°C, resulting in the precipitation of LDH. The desired samples were obtained through centrifugation, followed by washing with deionized water, and finally freeze-drying.