Drug release from the pellets was related to the proportion of the inner coat to the outer coat and the amount of pore forming agent in the outer coat.

In the forming process, the adsorbent is added with a pore forming agent and subjected to alkali treatment for home position crystallization and ion exchange.

The research results show that the YSZ porous ceramic tubes with a higher porosity and a uniform distribution porosity can be prepared by using corn meal as the pore forming agent.