Delaminated sodium nonatitanate and a method for producing delaminated sodium nonatitanate
View Patent ↗A hydrothermal synthesis method of making a delaminated titanate is disclosed. The delaminated titanate has a unique structure or morphology. The delaminated titanate is first formed by forming at a low temperature a layered sodium nonatitanate (SNT), which may be referred to as layered sodium titanate. The layered SNT has a unique morphology. The layered SNT is then synthesized into a delaminated titanate having a unique morphology.
1. A hydrothermal synthesis method, comprising:
mixing sodium hydroxide and a titanium compound to form a slurry;
heating the slurry to form a layered sodium titanate having between about 15% and 30% vacancy in the titanium sites;
adding an acid to the layered sodium titanate to form a layered acid titanate; and
adding a hydroxide of an alkyl ammonium or alkyl phosphonium to the layered acid titanate to form a delaminated titanate consisting of titanate layers;
wherein each layer of the layered sodium titanate has an aspect ratio of between 1:5 and 1:15.
2. The method of claim 1 , wherein the heating is between 150° C. and 170° C.
3. The method of claim 1 , wherein the amount of vacancy in the titanium sites is about 20%.
4. The method of claim 1 , wherein the heating is at about 170° C.
5. The method of claim 1 , further comprising:
drying the delaminated titanate to form a dried delaminated titanate.
6. The method of claim 5 , wherein the delaminated titanate is selected from the group consisting of a delaminated alkyl ammonium titanate and delaminated alkyl phosphonium titanate.
7. The method of claim 5 , wherein forming the delaminated titanate comprises mixing the layered acid titanate with tetrabutylammonium hydroxide.