Abstract
Potassium hexatitanate (PHT) with chemical formula K2Ti6O13 has a tunnel structure formed by TiO2 octahedra sharing edges or corners and with the potassium atoms located in the tunnels. This material has attracted great interest in the areas of photocatalysis, reinforcement of materials, biomaterials, etc. This work summarizes a large number of studies about methods to prepare PHT since particle size can be modified from millimeter to nanometric scale according to the applied method. Likewise, the synthesis method has influenced the material properties as band-gap and the final mechanical performance of composites when the reinforcement is PHT. The knowing of synthesis, properties and applications of PHT is worthwhile for the design of new materials and for the development of new applications taking advantage of their inherent properties.
Highlights
Alkaline metal titanates with tunnel structure attract great attention both experimental and theoretical for model systems, for being fast ionic conductors, as well as for their high photocatalytic activities
Principal applications of Potassium hexatitanate (PHT) fibers are a function of their properties, mainly physical, mechanical, friction and optical; this material has been used as reinforcing agent and photocatalyst
Escobedo Bretado et al evaluated the photocatalytic activity of PHT fibers, and the results showed that the maximum amount of hydrogen achieved was 2387 μmol of H2 /gcat in 8 h of irradiation with UV light [37]
Summary
Alkaline metal titanates with tunnel structure attract great attention both experimental and theoretical for model systems, for being fast ionic conductors, as well as for their high photocatalytic activities. In the thermodynamic analysis of the K2CO3-TiO2 system (Figure 1) carried out using the simulating conditions, consistent with the chemical reactions 1, 2, 3 and 4, the results showed a negative software HSC Chemistry 7.0 [19], considering 1 atm of pressure and temperatures from 25 to 1600. Gibbs free energy (∆G) is necessary to the formation of different titanates This analysis indicated °C as simulating conditions, consistent with the chemical reactions 1, 2, 3 and 4, the results the conditions of theoretical chemical equilibrium to obtain potassium titanates. In the case showed a negative Gibbs free energy (ΔG) is necessary to the formation of different titanates This of K2 Ti6 O13 (PHT), it could be obtained from 1100 ◦ C.
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