Thermal analysis of hydrogen titanate nanotubes prepared by potassium dititanate with water vapour treatment

Hydrogen titanate nanotubes were prepared by K₂Ti ₂O₅ with water vapour treatment. TG/DTG techniques were used to investigate their water content and dehydration kinetics. It was shown that chemical formula for hydrogen titanate nanotubes is TiO_2.0. ₅₈H₂O which is close to H₂Ti₂O ₅. The activation energy of dehydration from hydrogen titanate nanotubes is about 60 kJ/mol according the calculation of Friedman and Flynn-Wall- Ozawa methods. With multivariate non-linear regression calculation, it was found that dehydration of hydrogen titanate nanotubes is a two-step consecutive reaction. The first step is a reaction of nth order with autocatalysis. The second step is a reaction of nth order.