| abstract |
A method of preparing a transparent, stable and neutral photocatalytic titanium dioxide sol, comprising the steps of: (1) reacting a hydrated titanium dioxide gel with an alkaline peptizing agent to provide a peptized alkaline titanium dioxide sol ; (2) neutralizing the phosphoric acid peptized alkaline titanium dioxide sol to obtain a transparent, stable and neutral photocatalytic titanium dioxide sol; wherein the final pH value of the resulting neutralized sol is controlled to be within a range of 8 to 9. |