Characterization of a New Potassium Titanate, KTiO₂(OH) Synthesized via Hydrothermal Method

Abstract

A new potassium titanate, KTiO 2 (OH), synthesized by hydrothermal oxidation of Ti metal powder in KOH solution was characterized. The X-ray photospectroscopy revealed that titanium contained in this compound consists of only Ti 4+ , and FT-IR spectrum supported the existence of hydroxyl group in the structure. It was found that the titanate has a hexagonal tunnel structure with the space group P6 1 22 and lattice parameters a ) 9.8889 Å and c ) 28.6711 Å, by crystal structure analysis with the use of powder XRD pattern. This agrees with the results of electron diffraction and morphology observed by SEM. The heating of KTiO 2 (OH) above 528 °C led to dehydration and phase transformation to give K 2 Ti 2 O 5 .

Effect of atmosphere on the synthesis of potassium titanate

“…In spite of wide applications of potassium titanate, the synthesizing methods are limited to calcination [5], hydrothermal reaction [6][7], flux growth [8][9], melt reaction [10], and slow-cooling calcination [11]. With these methods, the preparation of potassium titanates should be carried out either at high pressure or at high temperature (600-1200°C), which leads to high production cost and consequently restricts the wider industrial application of potassium titanate.…”

Effect of the synthesis temperature of sodium nonatitanate on batch kinetics of strontium-ion adsorption from aqueous solution

“…In the case of inorganic sorbents for strontium-ion adsorption from aqueous solutions, naturally occurring materials, such as bentonite (clays) (Bochkarev and Pushkareva 2009;Bascetin and Atun 2010), zeolites (Rahman et al 2010;Boyd et al 1947), other nanoporous framework or hybrid materials (Li et al 2010), and hydrous metal oxides (Kirillov et al 2006) have been studied for metal separation applications. Another interesting class of inorganic sorbents proposed in the literature includes titanate and silicotitanates (Behrens et al 1998;DeFilippi et al 1997;Clearfield and Lehto 1988;Duff et al 2004;Masaki et al 2002;Graziano 1998), which could allow the adsorption of Sr 2+ from aqueous solution.…”

Synthesis of potassium hexatitanate whiskers using hydrothermal method

“…The processes are often complicated and energy consuming. And it is difficult to control the particle size and morphology of products [14]. In case of the melting methods, to lower the melting point of reaction system, some expensive fluxes are added, which need to be separated and recycled [15].…”