*2.2. Preparation of Porous Bacteria Cellulose*/*Poly Schi*ff *Base*

• Pretreatment

The bacteria cellulose was treated with the solution of alkaline sodium silicate. Then, HCl was added and sodium silicate transformed to NaCl and SiO2. After the removal of SiO2 by NaOH, the pretreated bacteria cellulose was freeze-dried and used for polymer coating.
