Zirconium Phosphate was prepared by reflux method . The

procedure followed was: 2.1 g of ZrOCl2 8H2O and 2M HCl

solution (50 ml) were added to the beaker, and then the

dropwise added to the mixture solution of 4M phosphoric acid

(3.2 ml) and 2M hydrochloric acid (2 ml), and it formed sol. The

sol was added to 12M phosphoric acid, and keep for 48 h at

a temperature of 90 C.

After that I added sufficient DI water ,then cleaned and filtering from last 4 days but PH is chaining very slowly. 

Is there any solution to bring PH=7 faster .

May I use NaOH solution to bring neutral PH.