Method for preparing inorganic porous nano material through multi-frequency compound ultrasonic cooperative reinforcement

The invention provides a method for preparing an inorganic porous nano material through multi-frequency compound ultrasonic cooperative reinforcement. The method comprises: weighing 23.616g of Ca(NO3)2 4H2O and 7.924g of (NH4)2HPO4 respectively, and dissolving with de-ionized water; accurately preparing a 0.100mol/L Ca(NO3)2 solution and a 0.060mol/L (NH4)2HPO4 solution by a volumetric flask; adjusting the pH (Potential of Hydrogen) of the two solutions to be about 10.2 by utilizing ammonia water; then, slowly dropwise adding 100mL of the (NH4)2HPO4 solution with the concentration of 0.060mol/L into a beaker containing 100mL of the Ca(NO3)2 solution with the concentration of 0.100mol/L through a separating funnel at room temperature; meanwhile, continuously stirring by a magnetic stirrer and reacting; after dropwise adding, moving the beaker filled with a reaction solution into a multi-frequency compound ultrasonic experiment device and carrying out ultrasonic treatment for 1h to 3h, wherein the reaction temp