Characterization of Hydrated Titanium Oxide With Sheet-Like and Tube-Like Structures Prepared by a Hydrothermal Processing

Abstract

Hydrated titanium oxides structures have been synthesized successfully from rutile by a single-step hydrothermal process at 130 ºC in NaOH at concentrations of 5 M and 10 M, monitoring up to two days. Field emission scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM) images indicate that samples treated at 5M were composed of sheet-like structures, while nanotubes were mainly found at 10 M. XRD analysis for both concentrations indicated presence of two phases, hydrated titanium oxide not indexed yet and rutile. Besides, X-ray diffraction (XRD) patterns of the samples treated at 10 M exhibited high reflections from the nanostructures, i.e., they possess high crystallinity. Thermogravimetry Analysis (TGA) indicated that the nanostructures show crystallized water in their matrix, specifically it was found that this hydrated phase has half molecule of occluded water per unit cell. This result is consistent with Raman spectroscopy that corroborates the existence of crystallization water in the synthesized product, by a deep profile of hydrated titanium oxide.

Highly conductive locust bean gum bio-electrolyte for superior long-life quasi-solid-state zinc-ion batteries

“… 5 The weight loss to between 200 °C and 350 °C was due to the loss of crystalline water. 31 The weight loss between 350 °C and 600 °C can be attributed to the loss of locust bean gum. 32 The last remaining mass is inorganic salts.…”

Surface Modification of Nickel Titanate Nanocubes with Ultra‐small Palladium and Platinum Nanocrystals to Promote Solar Hydrogen Generation under Visible Light

“…A variety of perovskites have shown great potential for hydrogen generation via either a photocatalytic or photoelectrochemical pathway, e. g., CaTiO 3 , [5] CoTiO 3 , [6–9] FeTiO 3 , [10] CrTiO 3 [10] etc. However, these perovskite catalysts suffer from various limitations that includes low surface area, rapid recombination of the charge species among others.…”

“…The perovskites that possess inherent dipole moment due the non-centrosymmetric metal center, are advantageous, particularly, to improve the separation of photogenerated charge carriers due to localized electric field developed, is the most crucial phenomena that govern the overall efficiency of the redox reactions, as most of the photogenerated charge carriers approximately (80 %) are lost by recombination, rather than participating in the water splitting redox reactions. [4] A variety of perovskites have shown great potential for hydrogen generation via either a photocatalytic or photoelectrochemical pathway, e. g., CaTiO 3 , [5] CoTiO 3 , [6][7][8][9] FeTiO 3 , [10] CrTiO 3 [10] etc. However, these perovskite catalysts suffer from various limitations that includes low surface area, rapid recombination of the charge species among others.…”